subject:(dissolution)

Texas A&M University

1. Chen, Hsueh-Ying. Methods for Determination of Structure and Kinetics in the Study of Macromolecules Using Dissolution DNP NMR.

Degree: PhD, Chemistry, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/155157

► Solution nuclear magnetic resonance spectroscopy (NMR) is known as a powerful tool in many fields because of its remarkable atomic resolution. However, its applications to… (more)

▼ Solution nuclear magnetic resonance spectroscopy (NMR) is known as a powerful tool in many fields because of its remarkable atomic resolution. However, its applications to non-equilibrium systems are limited due to low sensitivity of detection. A new technique, dissolution dynamic nuclear polarization (D-DNP) provides a unprecedented enhancement on NMR signals and opens a variety of applications of D-DNP NMR on time-resolved measurements at subsecond to second time scales. This thesis made a first attempt to monitor a protein kinetics using D-DNP NMR. A medium-size model protein (a two-state folder, L23) was directly hyperpolarized on 13C nuclei. The focus was placed on quantitative kinetic analysis and evaluations of possibilities that may affect the observed kinetics. In addition, this thesis included developments of experimental setups and NMR acquisition methods to address encountered problems in studies of large biomolecules using D-DNP. The refolding was triggered by changing the pH environment as a result of mixing aciddenatured L23 solution with a buffer of high pH. Chemical shift changes were observed in a series of time-resolved 13C spectra, indicating the formation of secondary structures. The re-folding rate constant was extracted by fitting fractions of folded/unfolded forms to a two-state folding kinetic model taking into account non-instantaneous mixing of two solutions. The assumption of equal relaxation time constants for folded/unfolded L23 and spectral artifacts arose from one-sided reaction were validated and evaluated. Consequently, the rate constants are in good agreement with those obtained from fluorescence experiments. In the above experiment, gas was used to inject the protein into an NMR tube. Due to turbulence from the rapid injection, protein samples are prone to foam which broadens NMR linewidths and leads to low signal-to-noise ratio. We have developed a new method to suppress air bubbles in which water was used to inject samples into a flow cell. Because of the incompressibility of liquid, the minimized residual sample motion was demonstrated as a parallel advantage that can alleviate signal loss in measurements using pulsed field gradients. In addition, the liquid driven injection permits studying biochemical reactions at a physiological condition since no need of using a mixture of organic solvent and water to dissolve protein sample for reducing propensity of foaming as in the above study. Conventional multidimensional NMR is not immediately compatible with the dissolution DNP to interrogate spin correlations due to the need of iterative measurements and the limitation of non-renewable hyperpolarization. We have developed a new method that integrates flow NMR into D-DNP to perform Hadamard spectroscopy and used entroy maximization algorithm to reconstruct pseudo-multidimensional spectra that contains spin correlations. As signal enhancement is critical for experiments that directly polarize large molecules, it is beneficial to monitor hyperpolarization level in the solid state… Advisors/Committee Members: Hilty, Christian (advisor), Cremer, Paul (committee member), Ross, Joseph (committee member), Son, Dong Hee (committee member).

Subjects/Keywords: dissolution DNP

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APA (6^th Edition):

Chen, H. (2015). Methods for Determination of Structure and Kinetics in the Study of Macromolecules Using Dissolution DNP NMR. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155157

Chicago Manual of Style (16^th Edition):

Chen, Hsueh-Ying. “Methods for Determination of Structure and Kinetics in the Study of Macromolecules Using Dissolution DNP NMR.” 2015. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021. http://hdl.handle.net/1969.1/155157.

MLA Handbook (7^th Edition):

Chen, Hsueh-Ying. “Methods for Determination of Structure and Kinetics in the Study of Macromolecules Using Dissolution DNP NMR.” 2015. Web. 23 Jan 2021.

Vancouver:

Chen H. Methods for Determination of Structure and Kinetics in the Study of Macromolecules Using Dissolution DNP NMR. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1969.1/155157.

Council of Science Editors:

Chen H. Methods for Determination of Structure and Kinetics in the Study of Macromolecules Using Dissolution DNP NMR. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155157

2. Gausse, Clémence. Synthèse et dissolution de matrices phosphatées de structure monazitique : Study and dissolution of monazite-type phosphate-based ceramics.

Degree: Docteur es, Chimie séparative, matériaux et procédés, 2016, Montpellier

URL: http://www.theses.fr/2016MONTT217

► Dans le cadre de la loi du 30 décembre 1991 relative à la gestion à long terme des déchets nucléaires, plusieurs matrices de confinement spécifique… (more)

▼ Dans le cadre de la loi du 30 décembre 1991 relative à la gestion à long terme des déchets nucléaires, plusieurs matrices de confinement spécifique des actinides, dont la monazite et la solution solide monazite/chéralite associée ont été étudiées au cours de ce travail en vue de leur stockage en formation géologique profonde. Ainsi, différentes monazites LnPO4 (Ln = La → Gd) ont été préparées par conversion thermique de rhabdophanes, LnPO4 , 0,667H2O, précipitées à basse température. Sur la base d’expériences menées sous rayonnement synchrotron, la structure cristallographique de la rhabdophane a d’abord été résolue dans un système monoclinique (groupe d’espace C2) tout comme la monazite (groupe d'espace P21/n) puis sa conversion thermique en monazite a été étudiée. Une étude multiparamétrique de la vitesse de dissolution de la monazite LnPO4 (Ln = La → Gd) dans l’acide nitrique a été réalisée en conditions dynamiques. Les valeurs de vitesses de dissolution normalisées sont demeurées très faibles quelles que soient l'acidité du milieu, la température et la nature de l’élément lanthanide, confirmant l’excellente durabilité chimique des matériaux préparés. Des ordres partiels relatifs à l'activité du proton compris entre 0,7 ± 0,2 et 1,5 ± 0,3 ont été relevés. Parallèlement, la diminution de l’énergie d’activation apparente pour T ≥ 313 K a souligné une modification de l’étape cinétiquement limitante du mécanisme de dissolution, liée à l'impact de l’indice de saturation de la solution par rapport à la précipitation de la phase rhabdophane.Les produits de solubilité des rhabdophanes (La → Dy) ainsi que les grandeurs thermodynamiques associées ont été déterminés via des expériences de sur- et de sous-saturation. Le bon accord entre les valeurs obtenues par ces deux approches a confirmé la réversibilité de l’équilibre de solubilité associé à la rhabdophane. Une faible variation du produit de solubilité et des grandeurs thermodynamiques de formation de la rhabdophane a été observée le long de la série des éléments lanthanide (-2151±13 ≤ Df H^o (298K) ≤ -2130±12 kJ.mol-1, -2004±2 ≤ Df G^o (298K) ≤ -1984±2 kJ.mol-1 et -504±11≤ DS^o (298K)≤ -473±12 J.mol-1.K-1), à l’exception de l’europium qui présente des valeurs nettement supérieures d'énergie libre (-1896 ± 2 kJ.mol-1), d'enthalpie (-2057 ± 9 kJ.mol-1) et d'entropie (–538 ± 11 J.mol-1.K-1) de formation. Par ailleurs, une relation directe entre les enthalpies obtenues pour les rhabdophanes et les monazites a été démontrée ; les données associées aux rhabdophanes étant obtenues par simple ajout de la contribution de 0,667 molécule d'eau. Cette observation corrobore aussi bien la structure monoclinique de la rhabdophane que le nombre de molécules d'eau constitutionnelles.Parallèlement, l'évolution structurale et microstructurale de la surface de monazites frittées a été suivie en cours de dissolution par plusieurs techniques complémentaires (MEBE, AFM, XRR, et DRX en mode d’incidence rasante). La très bonne durabilité chimique de ces céramiques préparées a été confirmée :… Advisors/Committee Members: Dacheux, Nicolas (thesis director).

Subjects/Keywords: Synthèse; Monazite; Dissolution; Synthesis; Monazite; Dissolution

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APA (6^th Edition):

Gausse, C. (2016). Synthèse et dissolution de matrices phosphatées de structure monazitique : Study and dissolution of monazite-type phosphate-based ceramics. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2016MONTT217

Chicago Manual of Style (16^th Edition):

Gausse, Clémence. “Synthèse et dissolution de matrices phosphatées de structure monazitique : Study and dissolution of monazite-type phosphate-based ceramics.” 2016. Doctoral Dissertation, Montpellier. Accessed January 23, 2021. http://www.theses.fr/2016MONTT217.

MLA Handbook (7^th Edition):

Gausse, Clémence. “Synthèse et dissolution de matrices phosphatées de structure monazitique : Study and dissolution of monazite-type phosphate-based ceramics.” 2016. Web. 23 Jan 2021.

Vancouver:

Gausse C. Synthèse et dissolution de matrices phosphatées de structure monazitique : Study and dissolution of monazite-type phosphate-based ceramics. [Internet] [Doctoral dissertation]. Montpellier; 2016. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2016MONTT217.

Council of Science Editors:

Gausse C. Synthèse et dissolution de matrices phosphatées de structure monazitique : Study and dissolution of monazite-type phosphate-based ceramics. [Doctoral Dissertation]. Montpellier; 2016. Available from: http://www.theses.fr/2016MONTT217

North Carolina State University

3. Bi, Yuqiang. Production of Co-Siderophore Complexes by Ligand-Promoted Dissolution.

Degree: MS, Soil Science, 2009, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/1847

► Recent research indicates that siderophores, a class of biogenic ligands with known exceptional affinity for Fe(III), can also strongly complex Co(III), an element essential to… (more)

▼ Recent research indicates that siderophores, a class of biogenic ligands with known exceptional affinity for Fe(III), can also strongly complex Co(III), an element essential to normal metabolic function of microbes and animals. This study was conducted to examine the siderophore-promoted dissolution rates and mechanisms of Co from model synthetic Co-bearing minerals to elucidate the role of siderophores in biogeochemical processes of Co. Dissolution of heterogenite (CoOOH) and four Co-goethites (Co-FeOOH) with different levels of Co substitution were investigated in the presence of a trihydroxamate siderophore, desferrioxamine B (DFOB), using batch and flow-through experiments, respectively. By measuring the complex and total metal concentrations in dissolution products, dissolution rates via multiple pathways were measured as a function of pH. Results showed that DFOB promoted dissolution of Co from Co-bearing minerals via pH-dependent mechanisms. For heterogenite, ligand-promoted dissolution was the dominant pathway at neutral to alkaline pH, while reductive dissolution became dominant for pH < 6. Cobalt substitution in Co-goethite resulted in increased total dissolution rates of both Co and Fe, but ligand-promoted and reductive Co dissolution pathways were difficult to examine due to the slow dissolution rates. The fast dissolution rate of heterogenite, coupled with the high affinity of Co(III) for DFOB, suggests that siderophore-promoted dissolution of Co(III) oxides is a biogeochemically favorable process. Although the association of Co with Fe oxide mineral may limit the Co dissolution rate, siderophore-promoted Co dissolution may still be an effective enough way to increase Co bioavailability. The results also suggest the possibility of radionuclide 60Co by siderophores from recalcitrant Fe oxide phases, which may be important to the fate and transport of 60Co in contaminated environments. Advisors/Committee Members: Owen Duckworth, Committee Chair (advisor), Dean Hesterberg, Committee Member (advisor), Detlef Knappe, Committee Member (advisor).

Subjects/Keywords: dissolution; cobalt; siderophore

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APA (6^th Edition):

Bi, Y. (2009). Production of Co-Siderophore Complexes by Ligand-Promoted Dissolution. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/1847

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bi, Yuqiang. “Production of Co-Siderophore Complexes by Ligand-Promoted Dissolution.” 2009. Thesis, North Carolina State University. Accessed January 23, 2021. http://www.lib.ncsu.edu/resolver/1840.16/1847.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bi, Yuqiang. “Production of Co-Siderophore Complexes by Ligand-Promoted Dissolution.” 2009. Web. 23 Jan 2021.

Vancouver:

Bi Y. Production of Co-Siderophore Complexes by Ligand-Promoted Dissolution. [Internet] [Thesis]. North Carolina State University; 2009. [cited 2021 Jan 23]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/1847.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bi Y. Production of Co-Siderophore Complexes by Ligand-Promoted Dissolution. [Thesis]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/1847

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

4. van Loenen, Gerrit (author). The effect of impurity of CO2 stream on enhanced gas dissolution.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:69490eaa-6a02-41dc-bb87-31cd27bf468e

► One of the methods of reducing the amount of CO2 in the air is CO2 sequestration by dissolving the gas underground in an aquifer. In… (more)

▼ One of the methods of reducing the amount of CO2 in the air is CO2 sequestration by dissolving the gas underground in an aquifer. In practice,there will be impurity gases in the injected CO2 stream or in the aquifer, which inﬂuence the dissolution rate of the CO2 stream. This research aims at ﬁnding a method to evaluate and calculate this inﬂuence. We focused on H2S and CH4. We found that given the speciﬁc circumstances underground and with added impurity gases, it is advisable to use an Equation of State, for which we chose Peng-Robinson. For the ﬁrst simulation with a large aquifer model, we were able to see the difference between a stream of pure CO2 and mixtures of CO2 with H2S and CH4 respectively. We observed that the gas stream with CH4 moved considerably faster along the aquifer than the streams of pure CO2 or CO2 mixed with H2S. On the other hand, we found that the dissolution rate was higher when H2S was present in the mixture. In the dissolution process, we see a large inﬂuence of instabilities on the dissolution rate as a result of density differences in the aquifer. However, the resolution of the large aquifer model did not allow to evaluate this inﬂuence sufﬁciently. In two consequent steps, we adapted our simulation model. First, we used a small scale model using only a fraction of the large aquifer model, thus considerably reducing the calculation time. Next, we increase the resolution of the small scale model. This higher resolution gave considerably more accurate results, reﬂecting the differences between the three cases and the inﬂuence of the instabilities in the aquifer. We concluded that the simulation based on the small scale and high resolution model yields accurate and reliable results. However, the calculated outcomes have to be corrected for the difference in boundary conditions between the large and small scale models. Advisors/Committee Members: Voskov, Denis (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: CO2; dissolution; aquifer

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APA (6^th Edition):

van Loenen, G. (. (2017). The effect of impurity of CO2 stream on enhanced gas dissolution. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:69490eaa-6a02-41dc-bb87-31cd27bf468e

Chicago Manual of Style (16^th Edition):

van Loenen, Gerrit (author). “The effect of impurity of CO2 stream on enhanced gas dissolution.” 2017. Masters Thesis, Delft University of Technology. Accessed January 23, 2021. http://resolver.tudelft.nl/uuid:69490eaa-6a02-41dc-bb87-31cd27bf468e.

MLA Handbook (7^th Edition):

van Loenen, Gerrit (author). “The effect of impurity of CO2 stream on enhanced gas dissolution.” 2017. Web. 23 Jan 2021.

Vancouver:

van Loenen G(. The effect of impurity of CO2 stream on enhanced gas dissolution. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Jan 23]. Available from: http://resolver.tudelft.nl/uuid:69490eaa-6a02-41dc-bb87-31cd27bf468e.

Council of Science Editors:

van Loenen G(. The effect of impurity of CO2 stream on enhanced gas dissolution. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:69490eaa-6a02-41dc-bb87-31cd27bf468e

5. Cordara, Théo. Effet de la présence de produits de fission sur les mécanismes de dissolution de composés modèles à base de dioxyde d'uranium : Effect of the presence of fission products on the dissolution mechanisms of model compounds based of uranium dioxide.

Degree: Docteur es, Chimie séparative, matériaux et procédés, 2017, Montpellier

URL: http://www.theses.fr/2017MONTT176

►

L’étape de dissolution des combustibles nucléaires usés, réalisée en milieu nitrique concentré, est complexe notamment du fait de leur complexité chimique et microstructurale à l’issue… (more)

▼

L’étape de dissolution des combustibles nucléaires usés, réalisée en milieu nitrique concentré, est complexe notamment du fait de leur complexité chimique et microstructurale à l’issue de leur passage en réacteur. Ainsi, la présence de produits de fission (PF) localisés au sein des différentes phases cristallines constitutives du combustible usé peut en impacter la vitesse de dissolution. Dans ce cadre, trois systèmes représentatifs du matériau combustible initial UO2, de UO2 contenant des PF dissous au sein de la phase fluorine ou formant de précipités métalliques ont été obtenus par conversion de précurseurs préparés par voie humide (oxalate, hydroxyde). Pour chaque système, des pastilles denses et de microstructures proches de celle retrouvée au sein du combustible usé ont été préparées à l’issue d’une étape de mise en forme suivie d’un traitement thermique à haute température.L’étude multiparamétrique de la dissolution (approche macroscopique) conduite dans plusieurs solutions d’acide nitrique et à diverses températures a souligné l’impact important joué par la composition chimique sur la durabilité chimique des échantillons. Ainsi, l’incorporation d’éléments lanthanide a conduit à une augmentation de la vitesse de dissolution par rapport à l’échantillon UO2 de référence, laquelle est demeurée largement inférieure à celle relevée en présence d’éléments platinoïde. Par ailleurs, les effets de l’acidité et de la température du milieu sur la vitesse de dissolution ont été examinés et des modifications significatives dans le mécanisme de dissolution prépondérant ont été suggérées pour des concentrations d’acide nitrique supérieures à 0,5 mol.L-1.Pour les trois systèmes sélectionnés, l’évolution de l’interface solide/solution a également été suivie en cours de dissolution à travers une étude operando, réalisée par Microscopie Electronique à Balayage en mode Environnemental (approche microscopique). En présence d’éléments lanthanide ou à proximité des éléments platinoïde métalliques, ce suivi a démontré l’existence de zones de dissolution préférentielles dont les joints de grains et les jonctions triples. Le couplage des résultats obtenus à travers ces deux approches a permis de fournir des données complémentaires en vue d’une meilleure compréhension des mécanismes de dissolution mis en jeu en présence des différents PF considérés.

The dissolution of spent nuclear fuels, performed in concentrated nitric acid solution, is a complex process due to some chemical and microstructural heterogeneities. As instance, the presence of Fission Products (FP) in various phases constitutive of spent nuclear fuels can affect the chemical durability of the materials. In this context, three systems of interest representing fresh UO2 used as reference material, and UO2 doped with FP products dissolved in the fluorite structure (lanthanide elements) or incorporated as metallic precipitates (platinoids) were prepared by oxalic or hydroxide precipitation. Dense pellets with microstructure representative for spent nuclear fuel were…

Advisors/Committee Members: Dacheux, Nicolas (thesis director).

Subjects/Keywords: Produits de fission; Mécanismes de dissolution; Dissolution; Fission products; Dissolution mechanims; Dissolution

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APA (6^th Edition):

Cordara, T. (2017). Effet de la présence de produits de fission sur les mécanismes de dissolution de composés modèles à base de dioxyde d'uranium : Effect of the presence of fission products on the dissolution mechanisms of model compounds based of uranium dioxide. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2017MONTT176

Chicago Manual of Style (16^th Edition):

Cordara, Théo. “Effet de la présence de produits de fission sur les mécanismes de dissolution de composés modèles à base de dioxyde d'uranium : Effect of the presence of fission products on the dissolution mechanisms of model compounds based of uranium dioxide.” 2017. Doctoral Dissertation, Montpellier. Accessed January 23, 2021. http://www.theses.fr/2017MONTT176.

MLA Handbook (7^th Edition):

Cordara, Théo. “Effet de la présence de produits de fission sur les mécanismes de dissolution de composés modèles à base de dioxyde d'uranium : Effect of the presence of fission products on the dissolution mechanisms of model compounds based of uranium dioxide.” 2017. Web. 23 Jan 2021.

Vancouver:

Cordara T. Effet de la présence de produits de fission sur les mécanismes de dissolution de composés modèles à base de dioxyde d'uranium : Effect of the presence of fission products on the dissolution mechanisms of model compounds based of uranium dioxide. [Internet] [Doctoral dissertation]. Montpellier; 2017. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2017MONTT176.

Council of Science Editors:

Cordara T. Effet de la présence de produits de fission sur les mécanismes de dissolution de composés modèles à base de dioxyde d'uranium : Effect of the presence of fission products on the dissolution mechanisms of model compounds based of uranium dioxide. [Doctoral Dissertation]. Montpellier; 2017. Available from: http://www.theses.fr/2017MONTT176

Rutgers University

6. Braido, Daniel, 1982-. Modeling and simulation of dissolution and erosion of porous solids.

Degree: MS, Mechanical and Aerospace Engineering, 2011, Rutgers University

URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057507

► Tablet dissolution modeling has seen multiple eff orts from both empirical and physical approaches. We present an expandable 3-D Cartesian framework for modeling many of… (more)

Subjects/Keywords: Tablets (Medicine) – Dissolution

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APA (6^th Edition):

Braido, Daniel, 1. (2011). Modeling and simulation of dissolution and erosion of porous solids. (Masters Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057507

Chicago Manual of Style (16^th Edition):

Braido, Daniel, 1982-. “Modeling and simulation of dissolution and erosion of porous solids.” 2011. Masters Thesis, Rutgers University. Accessed January 23, 2021. http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057507.

MLA Handbook (7^th Edition):

Braido, Daniel, 1982-. “Modeling and simulation of dissolution and erosion of porous solids.” 2011. Web. 23 Jan 2021.

Vancouver:

Braido, Daniel 1. Modeling and simulation of dissolution and erosion of porous solids. [Internet] [Masters thesis]. Rutgers University; 2011. [cited 2021 Jan 23]. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057507.

Council of Science Editors:

Braido, Daniel 1. Modeling and simulation of dissolution and erosion of porous solids. [Masters Thesis]. Rutgers University; 2011. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057507

Cornell University

7. Sarkar, Swarnavo. Numerical Simulation Of Corrosive Dissolution And Stress-Induced Changes In The Reaction Rates.

Degree: PhD, Civil and Environmental Engineering, 2013, Cornell University

URL: http://hdl.handle.net/1813/33944

► This dissertation is composed of three chapters. Each chapter addresses a specific topic and has been, or will be, submitted as a journal article. The… (more)

▼ This dissertation is composed of three chapters. Each chapter addresses a specific topic and has been, or will be, submitted as a journal article. The overarching theme connecting the content of the three chapters is the problem of accurately determining the rate off corrosion in alloy-electrolyte systems. At the beginning of every chapter there is a separate abstract that has been prepared for the respective journal publication. Broadly, in order to computationally simulate the process of corrosion we need the following: a knowledge of the physical laws that govern the rate of corrosion, a framework to compute the rate for alloy-electrolyte systems using these laws, and a method to update the position and the electrochemical properties of a corrosive front using the computed reaction rate. In the electrolytic domain, the effect of ionic concentration on the reaction rate is computed using ionic transport models. The most commonly used ionic transport model combines a set of Nernst-Planck equations with the electroneutrality condition without including the Gauss' law. On the other hand, the methods using Gauss' law have been reported to be challenging for a numerical solution. We developed an alternative ionic transport model based on Onsager's theory of nearequilibrium dissipative processes. We assumed the flow caused due to ionic interactions, as obtained using Onsager's theory, to be an additional unknown for the ionic transport model. We proposed that the flux density created due to this additional flow is the minimum that is required to satisfy the electroneutrality condition. Using our method we were able to reproduce the transient characteristics of electrodes that agreed in behavior with experimental observations. Also based on our numerical simulations, we observed that the dissipation due to ionic interactions is higher near the ionic sources at the boundaries and diminishes gradually into the bulk of the electrolyte. The motion of an alloy-electrolyte interface due to corrosion is a multiscale problem in time. The ionic transport process evolves at a time step depending on the diffusivity of the ions and dimensions of the anodic-cathodic regions on an alloy surface. It turns out that this time step is several order of magnitudes smaller than the time step at which we can observe a significant change in the alloy-electrolyte boundary due to corrosion. We proposed a quasi-steady state assumption in order to alleviate this problem. We assumed that for a fixed description of the alloy-electrolyte boundary there exists a steady state solution to the corrosion current density as dictated by the ionic transport process. This is a reasonable assumption for several corrosive systems, particularly for the ones surrounded by seawater. A finite element framework with adaptive remeshing was developed that uses the ionic transport model described above to determine the corrosion rate and explicitly integrate the motion of the corrosive front. We studied and observed the convergence of this method with respect to… Advisors/Committee Members: Aquino, Wilkins (chair), Wahlbin, Lars Bertil (committee member), Warner, Derek H. (committee member).

Subjects/Keywords: Corrosion; Chemical potential; Anodic dissolution

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APA (6^th Edition):

Sarkar, S. (2013). Numerical Simulation Of Corrosive Dissolution And Stress-Induced Changes In The Reaction Rates. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/33944

Chicago Manual of Style (16^th Edition):

Sarkar, Swarnavo. “Numerical Simulation Of Corrosive Dissolution And Stress-Induced Changes In The Reaction Rates.” 2013. Doctoral Dissertation, Cornell University. Accessed January 23, 2021. http://hdl.handle.net/1813/33944.

MLA Handbook (7^th Edition):

Sarkar, Swarnavo. “Numerical Simulation Of Corrosive Dissolution And Stress-Induced Changes In The Reaction Rates.” 2013. Web. 23 Jan 2021.

Vancouver:

Sarkar S. Numerical Simulation Of Corrosive Dissolution And Stress-Induced Changes In The Reaction Rates. [Internet] [Doctoral dissertation]. Cornell University; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1813/33944.

Council of Science Editors:

Sarkar S. Numerical Simulation Of Corrosive Dissolution And Stress-Induced Changes In The Reaction Rates. [Doctoral Dissertation]. Cornell University; 2013. Available from: http://hdl.handle.net/1813/33944

University of Michigan

8. Li, Zi. Manipulating Solubility and Dissolution through Multicomponent Crystallization.

Degree: PhD, Chemistry, 2016, University of Michigan

URL: http://hdl.handle.net/2027.42/133485

► Chemical entities can be arranged into different packing motifs, leading to variation in properties of solid materials. Therefore, solid form optimization is a critical approach… (more)

▼ Chemical entities can be arranged into different packing motifs, leading to variation in properties of solid materials. Therefore, solid form optimization is a critical approach to material development. Here crystallization systems with multiple components are investigated to improve performance of materials. Cocrystallization is a technique to optimize solid forms by introducing a neutral coformer to form multicomponent crystal with the target molecule; this method shows great potential to improve the dissolution of poorly soluble compounds. A novel carbamazepine /p-aminobenzoic acid 4:1 cocrystal is discovered and structurally characterized. Phase stability data demonstrate that it is a thermodynamically unstable form. According to the dissolution experiments, cocrystal stoichiometry is not the only factor that determines the dissolution rate; intermolecular interactions within the crystal play a vital role. Solid state studies of a class of nitric oxide releasing S-nitroso-N-acetyl-D-penicillamine (SNAP)-doped polymer materials are conducted to investigate the stability mechanism. Crystalline SNAP is detected in polymers and a crystallization based theory is proposed wherein SNAP molecules are partially solubilized in polymers, and the excess SNAP beyond the solubility limit crystallizes and embeds in the polymer. Solubility of SNAP in polymer has been determined by PXRD analysis. It is proposed that the lattice energy of crystalline SNAP is the key to the stability improvement, while the solubilized SNAP is more reactive that decomposes and releases NO. This crystallization based hypothesis has been tested in other SNAP/polymer composites. It is proposed that the unsuccessful cocrystallization between target compound and a poorly soluble coformer with accessible synthons can be a kinetic result of the coformer solubility limit, which favors the formation of single component crystals that compete with the hypothetical cocrystals. In order to retain a high degree of coformer supersaturation in solution favorable for cocrystallization, soluble polymeric additives were employed. It was demonstrated that solubility and metastable limit of poorly soluble compounds can be altered in presence of soluble polymers. Therefore, utilization of polymer additives is a feasible approach to adjust the metastable zone width which is a potential strategy to facilitate the growth of unattainable cocrystals. Advisors/Committee Members: Matzger, Adam J (committee member), Rodriguez-Hornedo, Nair (committee member), Biteen, Julie Suzanne (committee member), McNeil, Anne Jennifer (committee member).

Subjects/Keywords: crystallization; solubility; dissolution; Chemistry; Science

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APA (6^th Edition):

Li, Z. (2016). Manipulating Solubility and Dissolution through Multicomponent Crystallization. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/133485

Chicago Manual of Style (16^th Edition):

Li, Zi. “Manipulating Solubility and Dissolution through Multicomponent Crystallization.” 2016. Doctoral Dissertation, University of Michigan. Accessed January 23, 2021. http://hdl.handle.net/2027.42/133485.

MLA Handbook (7^th Edition):

Li, Zi. “Manipulating Solubility and Dissolution through Multicomponent Crystallization.” 2016. Web. 23 Jan 2021.

Vancouver:

Li Z. Manipulating Solubility and Dissolution through Multicomponent Crystallization. [Internet] [Doctoral dissertation]. University of Michigan; 2016. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2027.42/133485.

Council of Science Editors:

Li Z. Manipulating Solubility and Dissolution through Multicomponent Crystallization. [Doctoral Dissertation]. University of Michigan; 2016. Available from: http://hdl.handle.net/2027.42/133485

Penn State University

9. Skocik, Mariya. Effects of Spatial Heterogeneity on Calcite Dissolution Rates.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/21249

► The prediction of carbonate reservoirs behavior, including rock and fluid interactions, is challenging due to their complex mineralogy, porosity, and permeability heterogeneities. Calcite dissolution, one… (more)

▼ The prediction of carbonate reservoirs behavior, including rock and fluid interactions, is challenging due to their complex mineralogy, porosity, and permeability heterogeneities. Calcite dissolution, one of the most important subsurface reactions, has been studied since late 19th century with a sole focus on homogeneous systems. First studies of more realistic heterogeneous systems started in the past couple of years. This work examines the effects of geochemical heterogeneity on calcite dissolution rates with variable permeability contrasts, flow rates, and inlet pH. The investigation consisted of the two major parts: column experiments for dissolution data and reactive flow modeling by the use of CrunchFlow software that simulated the laboratory set-up. Two pairs of 10 cm long and 2.5 cm in diameter columns were wet packed with inert quartz and reactive calcite. The sets’ permeability contrasts were 0.5 and 0.83. Each set contained a Mixed Column, representing a homogeneous system, and a One-Zone Column, a heterogeneous system with a cylindrical calcite insertion along the principal flow direction. The inlet solution was injected upwards through the columns at flow rates between 0.03 and 6.3mL/min with pH at 4 and 6.7. The effluent samples were collected at the outlet of the column up to 10 residence times with variable time steps. The modeling was performed via CrunchFlow reactive flow software package. CrunchFlow simultaneously solves systems of differential transport equations for each grid block of the discretized system representation for each primary species. The reactive flow model was calibrated based on laboratory obtained calcite effluent breakthrough data for the slowest and fastest flow rates. Under low flow rates where the system reaches equilibrium, the column scale bulk dissolution rates varied between 1.02 and 1.55×10-11 mol/ m2/s, producing effluent calcium concentrations between 1.43 and 2.17×10-4 mol/L. The rates of the Mixed Columns were on average 1.25 times higher than those of the corresponding One-Zone Columns. At higher flow rates, under prevalent kinetic regime with transport rates higher than reaction rates, the dissolution rates increased up to 10-9 mol/ m2/s order of magnitude. The calcium concentration ranged between orders of magnitude 10-5 mol/L for One-Zone Columns and 10-4 mol/L for the Mixed Columns. The dissolution reaction occurred mostly at the interface of calcite and quartz the One-Zone Columns, leading to significantly lower rates than those in Mixed Columns, where all calcite and quartz grains were well-mixed. After matching the experimental data, more simulations were carried out under an array of was flow rate conditions between 0.03mL/min and 13mL/min with permeability contrasts between 0.01 and 12. Model results showed that the discrepancy of the dissolution rate of One-Zone Columns in comparison to the corresponding Mixed Columns increased with increase in flow velocity. The simulations also showed that that under conditions where permeability of calcite zone is… Advisors/Committee Members: Dr Li Li, Thesis Advisor/Co-Advisor, William Arthur Groves, Thesis Advisor/Co-Advisor, Mark Stephen Klima, Thesis Advisor/Co-Advisor, Dr Luis Ayala, Thesis Advisor/Co-Advisor.

Subjects/Keywords: Carbonate Heterogeneity; Dissolution Rate; CrunhFlow

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APA (6^th Edition):

Skocik, M. (2014). Effects of Spatial Heterogeneity on Calcite Dissolution Rates. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/21249

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Skocik, Mariya. “Effects of Spatial Heterogeneity on Calcite Dissolution Rates.” 2014. Thesis, Penn State University. Accessed January 23, 2021. https://submit-etda.libraries.psu.edu/catalog/21249.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Skocik, Mariya. “Effects of Spatial Heterogeneity on Calcite Dissolution Rates.” 2014. Web. 23 Jan 2021.

Vancouver:

Skocik M. Effects of Spatial Heterogeneity on Calcite Dissolution Rates. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Jan 23]. Available from: https://submit-etda.libraries.psu.edu/catalog/21249.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Skocik M. Effects of Spatial Heterogeneity on Calcite Dissolution Rates. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/21249

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

10. Salehikhoo, Fatemeh. Effect of Chemical Spatial Distribution of Magnesite on its dissolution Rate.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/22828

► In this research, we systematically investigated the effect of spatial distribution of magnesite on its dissolution rate under different conditions of column length, flow velocity,… (more)

▼ In this research, we systematically investigated the effect of spatial distribution of magnesite on its dissolution rate under different conditions of column length, flow velocity, and permeability contrast. Running the column experiments under a broad range of conditions, we were able to find the conditions under which the effect of spatial distribution of magnesite mattered in determining column-scale dissolution rate. The flow-through column experiments were conducted in plexiglass laboratory columns packed with magnesite and quartz forming different spatial patterns. Uniform and layered distributions, the two common distributions of minerals occurring in subsurface, were chosen as the spatial patterns for our experiments. The uniform pattern contained a uniform mixture of magnesite and quartz and was referred to as the “Mixed column.” The layered patterns contained layers of magnesite distributed within the matrix of quartz. We studied the effect of the orientation of magnesite layers on overall dissolution rate. The magnesite layers were placed either transverse or parallel to the direction of the flow: “flow-transverse” and “flow-parallel columns.” In the flow-transverse column, a layer of magnesite was horizontally laid within the column. In the flow-parallel columns, cylindrical layers of magnesite were vertically placed in the column. To investigate the effect of the number of layers on column-scale dissolution rate, one, two, and three cylindrical layers of magnesite were placed in columns: “One-zone”, “Two-zone”, and “Three-zone” columns. The amount of magnesite was kept almost the same in all the experiments (10% v/v). All the columns were flushed with acidic brine (pH=4) at a series of flow velocities ranging from 0.015 to 36 m/d. Comparing the rates of the Mixed with the rates of the One-zone flow transverse columns under all tested conditions (three length scales of 5, 10, and 22 cm and a series of flow velocities ranging from 0.18 m/d to 36 m/d) the results showed that the column-scale dissolution rate of the Mixed column was always higher than that of the One-zone column. At different flow velocities, the column-scale magnesite dissolution rate varied between 6.40×10-12 and 1.02×10-9 mol/m2/s. When comparing columns of different lengths under similar conditions of flow velocity and spatial distribution, the dissolution rate was higher in the shorter column (5 cm). In the longest columns (22 cm), under medium flow velocity (3.6 m/d), the Mixed column showed 1.14 times higher dissolution rate compared to that of the One-zone column. This was the largest rate difference among the flow-transverse columns. For the Mixed and flow-parallel columns, we systematically quantified dissolution rates under different conditions of flow velocities and permeability contrasts. The column experiments were conducted on two sets of columns with different permeability contrasts. The sets contained Mixed column and flow-parallel Three-zone, Two-zone, and One-zone columns. The permeability contrasts between the magnesite… Advisors/Committee Members: Dr Li Li, Dissertation Advisor/Co-Advisor, Dr Li Li, Committee Chair/Co-Chair, Susan Louise Brantley, Committee Member, Derek Elsworth, Committee Member, Zuleima T Karpyn, Committee Member.

Subjects/Keywords: Magnesite; Dissolution; Rate; Spatial Dirtibution

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Salehikhoo, F. (2014). Effect of Chemical Spatial Distribution of Magnesite on its dissolution Rate. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22828

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Salehikhoo, Fatemeh. “Effect of Chemical Spatial Distribution of Magnesite on its dissolution Rate.” 2014. Thesis, Penn State University. Accessed January 23, 2021. https://submit-etda.libraries.psu.edu/catalog/22828.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Salehikhoo, Fatemeh. “Effect of Chemical Spatial Distribution of Magnesite on its dissolution Rate.” 2014. Web. 23 Jan 2021.

Vancouver:

Salehikhoo F. Effect of Chemical Spatial Distribution of Magnesite on its dissolution Rate. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Jan 23]. Available from: https://submit-etda.libraries.psu.edu/catalog/22828.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Salehikhoo F. Effect of Chemical Spatial Distribution of Magnesite on its dissolution Rate. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22828

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queens University

11. Shojib, Mahmudul. Dissolution of Trapped Light Non-Aqueous Phase Liquid in the Presence of Trapped Gas .

Degree: Civil Engineering, 2015, Queens University

URL: http://hdl.handle.net/1974/12767

► The dissolution of residual, or trapped, light non-aqueous phase liquid (LNAPL) is an important process that controls, in part, many LNAPL contaminated site remediation. Smear… (more)

▼ The dissolution of residual, or trapped, light non-aqueous phase liquid (LNAPL) is an important process that controls, in part, many LNAPL contaminated site remediation. Smear zones can be created in LNAPL source zones by water table fluctuation, trapping both residual LNAPL and gas below the water table to create a three-phase gas-LNAPL-water system. Two sets of laboratory experiments were conducted in this study to investigate the effect of trapped gas on the distribution and dissolution of trapped LNAPL. The first set involved visualization experiments where heptane was spilled in a two-dimensional (2-D) cell. Observations suggested that both heptane and air were trapped during an experiment with a large water table fluctuation, and consisted of singlets, doublets and multi-pore ganglions. Heptane was distributed as very thin films around most of the trapped air, and as discontinuous lenses, most of which were connected to air. The second set of experiments consisted of toluene dissolution experiments in short one dimensional (1-D) columns. Results showed that toluene dissolution was faster in an air-toluene-water system than in a toluene-water system. Toluene concentrations in the three-phase system were high during the early period of the dissolution, and dropped rapidly after 150-250 pore volumes, followed by long tailing concentrations. The increased toluene-water interfacial area associated with toluene films or layers in the three-phase system might be responsible for the observed dissolution behaviour. Toluene concentrations during dissolution from the two-phase system declined more slowly, and were consistently higher than those in the three-phase experiments. Modelling showed that existing two-phase empirical dissolution models, when applied to a three-phase system, over-predict early toluene concentrations, and significantly under-predict the later toluene concentrations and the time required for dissolution. The lumped mass transfer coefficient, based on the best fit of a general power law model, was found to be orders of magnitudes higher for dissolution in the three-phase system than that for the two-phase system. In conclusion, trapped LNAPL dissolution in the presence of trapped gas is substantially different than that which occurs without any gas phase, and predictions of natural attenuation and remediation performance made using two-phase models will be misleading.

Subjects/Keywords: Gas ; Three-Phase ; LNAPL ; Dissolution

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APA (6^th Edition):

Shojib, M. (2015). Dissolution of Trapped Light Non-Aqueous Phase Liquid in the Presence of Trapped Gas . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/12767

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shojib, Mahmudul. “Dissolution of Trapped Light Non-Aqueous Phase Liquid in the Presence of Trapped Gas .” 2015. Thesis, Queens University. Accessed January 23, 2021. http://hdl.handle.net/1974/12767.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shojib, Mahmudul. “Dissolution of Trapped Light Non-Aqueous Phase Liquid in the Presence of Trapped Gas .” 2015. Web. 23 Jan 2021.

Vancouver:

Shojib M. Dissolution of Trapped Light Non-Aqueous Phase Liquid in the Presence of Trapped Gas . [Internet] [Thesis]. Queens University; 2015. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1974/12767.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shojib M. Dissolution of Trapped Light Non-Aqueous Phase Liquid in the Presence of Trapped Gas . [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/12767

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

12. Barlow, Burke C. Reducing Residue In Nickel Electroplating Operations.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/7437

► Most commercial nickel electroplating cells use soluble nickel anodes that generate some amount of residue, typically nickel fines and impurities that detach from the bulk… (more)

Subjects/Keywords: Nickel anode dissolution; Pitting Corrosion

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APA (6^th Edition):

Barlow, B. C. (2016). Reducing Residue In Nickel Electroplating Operations. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7437

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Barlow, Burke C. “Reducing Residue In Nickel Electroplating Operations.” 2016. Thesis, University of Saskatchewan. Accessed January 23, 2021. http://hdl.handle.net/10388/7437.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Barlow, Burke C. “Reducing Residue In Nickel Electroplating Operations.” 2016. Web. 23 Jan 2021.

Vancouver:

Barlow BC. Reducing Residue In Nickel Electroplating Operations. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10388/7437.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Barlow BC. Reducing Residue In Nickel Electroplating Operations. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/7437

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan Technological University

13. Klemm, Sara. Bioenhanced Dissolution of a Tetrachloroethene (PCE) Pool in a Sand Tank Aquifer System.

Degree: MS, Department of Civil and Environmental Engineering, 2016, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/184

► Tetrachloroethene (PCE) is a common groundwater contaminant. Several bacterial strains have the ability to respire PCE and/or its daughter products through dehalorespiration, and can… (more)

Subjects/Keywords: PCE; bioenhanced dissolution; Environmental Engineering

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APA (6^th Edition):

Klemm, S. (2016). Bioenhanced Dissolution of a Tetrachloroethene (PCE) Pool in a Sand Tank Aquifer System. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/184

Chicago Manual of Style (16^th Edition):

Klemm, Sara. “Bioenhanced Dissolution of a Tetrachloroethene (PCE) Pool in a Sand Tank Aquifer System.” 2016. Masters Thesis, Michigan Technological University. Accessed January 23, 2021. https://digitalcommons.mtu.edu/etdr/184.

MLA Handbook (7^th Edition):

Klemm, Sara. “Bioenhanced Dissolution of a Tetrachloroethene (PCE) Pool in a Sand Tank Aquifer System.” 2016. Web. 23 Jan 2021.

Vancouver:

Klemm S. Bioenhanced Dissolution of a Tetrachloroethene (PCE) Pool in a Sand Tank Aquifer System. [Internet] [Masters thesis]. Michigan Technological University; 2016. [cited 2021 Jan 23]. Available from: https://digitalcommons.mtu.edu/etdr/184.

Council of Science Editors:

Klemm S. Bioenhanced Dissolution of a Tetrachloroethene (PCE) Pool in a Sand Tank Aquifer System. [Masters Thesis]. Michigan Technological University; 2016. Available from: https://digitalcommons.mtu.edu/etdr/184

University of Illinois – Urbana-Champaign

14. Fanizza, Michael F. Precipitation and Dissolution of Uranyl Phosphates in a Mircofluidic Pore Structure.

Degree: MS, 0231, 2011, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/26283

► The abiotic precipitation of uranium (U(VI)) was evaluated in a microfluidic pore structure (i.e. micromodel) to assess the efficacy of using a phosphate amendment to… (more)

▼ The abiotic precipitation of uranium (U(VI)) was evaluated in a microfluidic pore structure (i.e. micromodel) to assess the efficacy of using a phosphate amendment to immobilize uranium in groundwater and mitigate the risk of this contaminant to potential down-gradient receptor sites. U(VI) was mixed transverse to the direction of flow with hydrogen phosphate (HPO42-), in the presence or absence of calcium (Ca2+) or sulfate (SO42-), in order to identify precipitation rates, the morphology and types of minerals formed, and the stability of these minerals to dissolution with and without bicarbonate (HCO3-) present. Raman backscattering spectroscopy and micro X-ray diffraction (??-XRD) results both showed that the only mineral precipitated was chernikovite (also known as hydrogen uranyl phosphate; UO2HPO4), even though the formation of other minerals were thermodynamically favored depending on the experimental conditions. Precipitation and dissolution rates varied with influent conditions. Relative to when only U(VI) and HPO42- were present, precipitation rates were 2.3 times slower when SO42- was present, and 1.4 times faster when Ca2+ was present. These rates were inversely related to the size of crystals formed during precipitation. Dissolution rates for chernikovite increased with increasing HCO3- concentrations, consistent with formation of uranyl carbonate complexes in aqueous solution, and they were the fastest for chernikovite formed in the presence of SO42-, and slowest for the chernikovite formed in the presence of Ca2+. These rates are related to the ratios of mineral-water interfacial area to mineral volume. Fluorescent tracer studies and laser confocal microscopy images showed that densely aggregated precipitates blocked pores and reduced permeability. The results suggest that changes in the solute conditions evaluated affect precipitation rates, crystal morphology, and crystal stability, but not mineral type. Advisors/Committee Members: Werth, Charles J. (advisor), Strathmann, Timothy J. (advisor), Finneran, Kevin T. (advisor).

Subjects/Keywords: remediation; uranium; micromodel; precipitation; dissolution

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APA (6^th Edition):

Fanizza, M. F. (2011). Precipitation and Dissolution of Uranyl Phosphates in a Mircofluidic Pore Structure. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/26283

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fanizza, Michael F. “Precipitation and Dissolution of Uranyl Phosphates in a Mircofluidic Pore Structure.” 2011. Thesis, University of Illinois – Urbana-Champaign. Accessed January 23, 2021. http://hdl.handle.net/2142/26283.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fanizza, Michael F. “Precipitation and Dissolution of Uranyl Phosphates in a Mircofluidic Pore Structure.” 2011. Web. 23 Jan 2021.

Vancouver:

Fanizza MF. Precipitation and Dissolution of Uranyl Phosphates in a Mircofluidic Pore Structure. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2142/26283.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fanizza MF. Precipitation and Dissolution of Uranyl Phosphates in a Mircofluidic Pore Structure. [Thesis]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/26283

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

15. Gout, Thomas Lawrence. Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses.

Degree: PhD, 2020, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/302808

► Safely disposing of radioactive waste glass within a geological disposal facility requires a thorough understanding of the kinetics and mechanisms of their aqueous dissolution over… (more)

▼ Safely disposing of radioactive waste glass within a geological disposal facility requires a thorough understanding of the kinetics and mechanisms of their aqueous dissolution over geological timescales. Whilst a significant number of studies have taken place on international waste glass compositions, major compositional differences between UK Magnox and international waste glasses render many of these studies inapplicable to UK Magnox glasses. Notably, one of the major compositional differences between UK and international glasses is the presence of Li. Further, the presence of excess Li concentrations in some UK vitrified products has meant the effects of Li on the aqueous durability of UK waste glasses needed to be investigated. Additionally, dissolution experiments commonly take place at a higher temperature than the expected temperature of groundwater within a geological disposal facility. As such, the effects of dissolution temperature on the mechanisms of dissolution was also investigated. As the Li contents of complex waste glasses cannot be varied, two seven-component analogues of molar Li:Na ratios of 1.0 and 1.5 based upon a 25 wt.% loading UK Magnox waste glass with and without excess Li contents were fabricated. After characterising these glasses, they were leached in a mechanistic study to investigate the effects of Li on chemical durability. In addition to 7Li MAS-NMR and 6Li-1H CP-NMR, comprehensive 11B and 23Na MAS-NMR studies and SEM imaging of the leached glass surfaces then took place to investigate the effects of dissolution on the structures of the glasses. Here we show that the proportion of IIIB to IVB units did not evolve as the Li:Na ratio was varied; suggesting that Na preferentially charge compensates the B network. However, the B network was shown to leach incongruently at 90 °C. Despite Li being shown to be detrimental to durability during the earlier dissolution regimes, the residual rates of alteration implied excess Li contents had no long-term effects on chemical durability. The observed incongruent dissolution of the B network and initially decreased chemical durability could be attributed to Li preferentially modifying the Si network, thereby promoting glass hydration and B network dissolution whilst the Na compensated IVB units were less affected than IIIB units. Additionally, Li and Na were shown to be incorporated into secondary phases at 90 °C, but these Na-bearing phases were not observed at 40 °C. To compare the effects of Li contents on international and UK waste glass compositions, Li was substituted for Na in the well-studied Li-free French analogue “International Simple Glass” at molar Li:Na ratios of 0.4 and 0.9. These fabricated glasses were then leached and characterised in the same manner as the Magnox waste glasses. It was shown that the IIIB/IVB ratio and the role of Na in the pristine glasses varied insignificantly with the Li:Na ratio. Further, the B network of these glasses was shown to leach congruently at both 40 and 90 °C. However, Li, Na and Mg were shown to…

Subjects/Keywords: Nuclear; Glass; Dissolution; Isotopes

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APA (6^th Edition):

Gout, T. L. (2020). Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/302808

Chicago Manual of Style (16^th Edition):

Gout, Thomas Lawrence. “Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses.” 2020. Doctoral Dissertation, University of Cambridge. Accessed January 23, 2021. https://www.repository.cam.ac.uk/handle/1810/302808.

MLA Handbook (7^th Edition):

Gout, Thomas Lawrence. “Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses.” 2020. Web. 23 Jan 2021.

Vancouver:

Gout TL. Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Jan 23]. Available from: https://www.repository.cam.ac.uk/handle/1810/302808.

Council of Science Editors:

Gout TL. Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/302808

Delft University of Technology

16. Westerhof, H.P. On the Structure and Dissolution Properties of Poly(p-phenylene terephthalamide): Effect of Solvent Composition.

Degree: 2009, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd

► Poly-p-phenylenetherephthalamide (PpPTA) is a high performance, semi flexible polymer. Commercially it is mainly sold in the form of fibres under the trade names Twaron and… (more)

Subjects/Keywords: PpPTA; dissolution

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APA (6^th Edition):

Westerhof, H. P. (2009). On the Structure and Dissolution Properties of Poly(p-phenylene terephthalamide): Effect of Solvent Composition. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd

Chicago Manual of Style (16^th Edition):

Westerhof, H P. “On the Structure and Dissolution Properties of Poly(p-phenylene terephthalamide): Effect of Solvent Composition.” 2009. Doctoral Dissertation, Delft University of Technology. Accessed January 23, 2021. http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd.

MLA Handbook (7^th Edition):

Westerhof, H P. “On the Structure and Dissolution Properties of Poly(p-phenylene terephthalamide): Effect of Solvent Composition.” 2009. Web. 23 Jan 2021.

Vancouver:

Westerhof HP. On the Structure and Dissolution Properties of Poly(p-phenylene terephthalamide): Effect of Solvent Composition. [Internet] [Doctoral dissertation]. Delft University of Technology; 2009. [cited 2021 Jan 23]. Available from: http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd.

Council of Science Editors:

Westerhof HP. On the Structure and Dissolution Properties of Poly(p-phenylene terephthalamide): Effect of Solvent Composition. [Doctoral Dissertation]. Delft University of Technology; 2009. Available from: http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; urn:NBN:nl:ui:24-uuid:b628ad17-f248-41bd-916b-e01c05d3adfd ; http://resolver.tudelft.nl/uuid:b628ad17-f248-41bd-916b-e01c05d3adfd

Louisiana State University

17. Stevens, Christopher Clayton. Sinking of hydrocarbon mixtures due to evaporative and/or dissolution weathering on the surface and submerged in water.

Degree: MSChE, Chemical Engineering, 2013, Louisiana State University

URL: etd-01272014-142921 ; https://digitalcommons.lsu.edu/gradschool_theses/77

► The appearance of on-bottom oil following surface and deep water spills has been well documented. A very likely, yet sparingly studied, cause of this phenomenon… (more)

Subjects/Keywords: oil; weathering; evaporation; dissolution

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APA (6^th Edition):

Stevens, C. C. (2013). Sinking of hydrocarbon mixtures due to evaporative and/or dissolution weathering on the surface and submerged in water. (Masters Thesis). Louisiana State University. Retrieved from etd-01272014-142921 ; https://digitalcommons.lsu.edu/gradschool_theses/77

Chicago Manual of Style (16^th Edition):

Stevens, Christopher Clayton. “Sinking of hydrocarbon mixtures due to evaporative and/or dissolution weathering on the surface and submerged in water.” 2013. Masters Thesis, Louisiana State University. Accessed January 23, 2021. etd-01272014-142921 ; https://digitalcommons.lsu.edu/gradschool_theses/77.

MLA Handbook (7^th Edition):

Stevens, Christopher Clayton. “Sinking of hydrocarbon mixtures due to evaporative and/or dissolution weathering on the surface and submerged in water.” 2013. Web. 23 Jan 2021.

Vancouver:

Stevens CC. Sinking of hydrocarbon mixtures due to evaporative and/or dissolution weathering on the surface and submerged in water. [Internet] [Masters thesis]. Louisiana State University; 2013. [cited 2021 Jan 23]. Available from: etd-01272014-142921 ; https://digitalcommons.lsu.edu/gradschool_theses/77.

Council of Science Editors:

Stevens CC. Sinking of hydrocarbon mixtures due to evaporative and/or dissolution weathering on the surface and submerged in water. [Masters Thesis]. Louisiana State University; 2013. Available from: etd-01272014-142921 ; https://digitalcommons.lsu.edu/gradschool_theses/77

University of Cambridge

18. Gout, Thomas Lawrence. Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses.

Degree: PhD, 2020, University of Cambridge

URL: https://doi.org/10.17863/CAM.49882 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801805

► Safely disposing of radioactive waste glass within a geological disposal facility requires a thorough understanding of the kinetics and mechanisms of their aqueous dissolution over… (more)

▼ Safely disposing of radioactive waste glass within a geological disposal facility requires a thorough understanding of the kinetics and mechanisms of their aqueous dissolution over geological timescales. Whilst a significant number of studies have taken place on international waste glass compositions, major compositional differences between UK Magnox and international waste glasses render many of these studies inapplicable to UK Magnox glasses. Notably, one of the major compositional differences between UK and international glasses is the presence of Li. Further, the presence of excess Li concentrations in some UK vitrified products has meant the effects of Li on the aqueous durability of UK waste glasses needed to be investigated. Additionally, dissolution experiments commonly take place at a higher temperature than the expected temperature of groundwater within a geological disposal facility. As such, the effects of dissolution temperature on the mechanisms of dissolution was also investigated. As the Li contents of complex waste glasses cannot be varied, two seven-component analogues of molar Li:Na ratios of 1.0 and 1.5 based upon a 25 wt.% loading UK Magnox waste glass with and without excess Li contents were fabricated. After characterising these glasses, they were leached in a mechanistic study to investigate the effects of Li on chemical durability. In addition to 7Li MAS-NMR and 6Li-1H CP-NMR, comprehensive 11B and 23Na MAS-NMR studies and SEM imaging of the leached glass surfaces then took place to investigate the effects of dissolution on the structures of the glasses. Here we show that the proportion of IIIB to IVB units did not evolve as the Li:Na ratio was varied; suggesting that Na preferentially charge compensates the B network. However, the B network was shown to leach incongruently at 90 °C. Despite Li being shown to be detrimental to durability during the earlier dissolution regimes, the residual rates of alteration implied excess Li contents had no long-term effects on chemical durability. The observed incongruent dissolution of the B network and initially decreased chemical durability could be attributed to Li preferentially modifying the Si network, thereby promoting glass hydration and B network dissolution whilst the Na compensated IVB units were less affected than IIIB units. Additionally, Li and Na were shown to be incorporated into secondary phases at 90 °C, but these Na-bearing phases were not observed at 40 °C. To compare the effects of Li contents on international and UK waste glass compositions, Li was substituted for Na in the well-studied Li-free French analogue “International Simple Glass” at molar Li:Na ratios of 0.4 and 0.9. These fabricated glasses were then leached and characterised in the same manner as the Magnox waste glasses. It was shown that the IIIB/IVB ratio and the role of Na in the pristine glasses varied insignificantly with the Li:Na ratio. Further, the B network of these glasses was shown to leach congruently at both 40 and 90 °C. However, Li, Na and Mg were shown to…

Subjects/Keywords: Nuclear; Glass; Dissolution; Isotopes

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APA (6^th Edition):

Gout, T. L. (2020). Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.49882 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801805

Chicago Manual of Style (16^th Edition):

Gout, Thomas Lawrence. “Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses.” 2020. Doctoral Dissertation, University of Cambridge. Accessed January 23, 2021. https://doi.org/10.17863/CAM.49882 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801805.

MLA Handbook (7^th Edition):

Gout, Thomas Lawrence. “Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses.” 2020. Web. 23 Jan 2021.

Vancouver:

Gout TL. Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Jan 23]. Available from: https://doi.org/10.17863/CAM.49882 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801805.

Council of Science Editors:

Gout TL. Developing an understanding of the relationship between the durability of simplified and complex UK radioactive waste glasses. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://doi.org/10.17863/CAM.49882 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801805

University of Sydney

19. Douglass, Ian Michael. A Computational Study of Material Transformations in Glass Forming Systems .

Degree: 2018, University of Sydney

URL: http://hdl.handle.net/2123/19729

► Amorphous solids (glasses) are a class of materials that lack the traditional long-range order found in crystals, and are primarily formed by rapid cooling of… (more)

Subjects/Keywords: amorphous; computational; structure; dissolution; precipitation

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APA (6^th Edition):

Douglass, I. M. (2018). A Computational Study of Material Transformations in Glass Forming Systems . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/19729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Douglass, Ian Michael. “A Computational Study of Material Transformations in Glass Forming Systems .” 2018. Thesis, University of Sydney. Accessed January 23, 2021. http://hdl.handle.net/2123/19729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Douglass, Ian Michael. “A Computational Study of Material Transformations in Glass Forming Systems .” 2018. Web. 23 Jan 2021.

Vancouver:

Douglass IM. A Computational Study of Material Transformations in Glass Forming Systems . [Internet] [Thesis]. University of Sydney; 2018. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2123/19729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Douglass IM. A Computational Study of Material Transformations in Glass Forming Systems . [Thesis]. University of Sydney; 2018. Available from: http://hdl.handle.net/2123/19729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Sydney

20. Kausmann, Tino. Modified Dissolution Behaviour of Salts through Additives .

Degree: 2013, University of Sydney

URL: http://hdl.handle.net/2123/9782

► The reduction of salt in food is a contemporary health challenge, which can be achieved by modifying the salt dissolution behaviour with additives and, therefore,… (more)

Subjects/Keywords: Dissolution; Salt; additives; spray-drying

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kausmann, T. (2013). Modified Dissolution Behaviour of Salts through Additives . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/9782

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kausmann, Tino. “Modified Dissolution Behaviour of Salts through Additives .” 2013. Thesis, University of Sydney. Accessed January 23, 2021. http://hdl.handle.net/2123/9782.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kausmann, Tino. “Modified Dissolution Behaviour of Salts through Additives .” 2013. Web. 23 Jan 2021.

Vancouver:

Kausmann T. Modified Dissolution Behaviour of Salts through Additives . [Internet] [Thesis]. University of Sydney; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2123/9782.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kausmann T. Modified Dissolution Behaviour of Salts through Additives . [Thesis]. University of Sydney; 2013. Available from: http://hdl.handle.net/2123/9782

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Belloni, Julien. Modélisation des phénomènes de dissolution lors des phases précoces et avancées d'un accident grave de réacteur nucléaire : Modeling of dissolution phenomena in early and late phases of a severe accident.

Degree: Docteur es, Energétique, 2009, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2009ECAP0008

►

Cette thèse porte sur la modélisation des phénomènes de dissolution lors de la phase précoce d'un accident grave de réacteur nucléaire. L'étude s'intéresse à la… (more)

▼

Cette thèse porte sur la modélisation des phénomènes de dissolution lors de la phase précoce d'un accident grave de réacteur nucléaire. L'étude s'intéresse à la dissolution de céramiques solides (ZrO2 et UO2) par un métal liquide (Zr). En cas d'hypothétique accident grave dans un Réacteur à Eau Pressurisée, les phénomènes de dissolution jouent un rôle primordial dans l'aggravation de la dégradation et la fusion des oxydes à des températures parfois largement inférieures à leur température de fusion normale. Cela concerne en particulier les principaux constituants des crayons combustibles : les pastilles d'UO2 ainsi que la couche de ZrO2 formée sur la surface externe de la gaine qui vont subir une dissolution par le zircaloy des gaines à partir de 2100 K (la température de fusion de ces oxydes étant supérieure à 2800 K). Dans l'état actuel des connaissances, on peut supposer que les phénomènes de dissolution sont responsables, d'une part, de l'effondrement prématuré des crayons combustibles dans le cœur et, d'autre part, de la formation rapide d'un bain liquide en fond de cuve si des oxydes de fer sont présents. De nombreuses études expérimentales ont été menées sur ce sujet mais la modélisation n'est pas encore satisfaisante à ce jour. Les modèles actuels sont essentiellement des modèles 1D qui ne prennent pas en compte de façon explicite la convection naturelle ni la présence d'une zone de transition diphasique au niveau de l'interface métal / céramique. Un modèle 2D, décrivant les transferts de quantité de mouvement, de chaleur et de masse, établi par prise de moyenne volumique des équations microscopiques de transport a été développé. Ce modèle est basé sur des hypothèses d'équilibre thermique local et de non-équilibre massique local et s'inspire d'un modèle de solidification de mélanges binaires (P. Bousquet-Mélou, 2000). Sur le plan théorique, l'approche est identique. Cependant, la dissolution introduit des contraintes physico-numériques supplémentaires qu'il a fallu prendre en compte. La prise en compte des deux aspects mentionnés (convection et zone diphasique) constitue une nouveauté significative par rapport aux modèles existants. Le modèle a été ensuite étendu au cas ternaire grâce à des développements nouveaux permettant de résoudre certaines difficultés supplémentaires (ajout d'une équation d'espèce, relations d'équilibre non bijectives, plusieurs coefficients de diffusion à déterminer, indétermination sur les flux à l'interface, densité du solide non constante...) afin d'étudier la dissolution UO2 / Zr. Une validation des modèles obtenus est faite à partir de résultats expérimentaux de dissolution de creusets en ZrO2 et UO2 par le zircaloy liquide et montrent la bonne qualité prédictive de notre modèle.

This thesis focuses on the modeling of dissolution phenomena during the early phase of a serious accident of nuclear reactor. The study focuses on the dissolution of solid ceramic (ZrO2 and UO2) by a liquid metal (Zr). In case of hypothetical severe accident in a pressurized water reactor, the…

Advisors/Committee Members: Goyeau, Benoît (thesis director).

Subjects/Keywords: Dissolution; Milieux poreux; Modèle 2D; Dissolution; Porous media; 2D modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Belloni, J. (2009). Modélisation des phénomènes de dissolution lors des phases précoces et avancées d'un accident grave de réacteur nucléaire : Modeling of dissolution phenomena in early and late phases of a severe accident. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2009ECAP0008

Chicago Manual of Style (16^th Edition):

Belloni, Julien. “Modélisation des phénomènes de dissolution lors des phases précoces et avancées d'un accident grave de réacteur nucléaire : Modeling of dissolution phenomena in early and late phases of a severe accident.” 2009. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed January 23, 2021. http://www.theses.fr/2009ECAP0008.

MLA Handbook (7^th Edition):

Belloni, Julien. “Modélisation des phénomènes de dissolution lors des phases précoces et avancées d'un accident grave de réacteur nucléaire : Modeling of dissolution phenomena in early and late phases of a severe accident.” 2009. Web. 23 Jan 2021.

Vancouver:

Belloni J. Modélisation des phénomènes de dissolution lors des phases précoces et avancées d'un accident grave de réacteur nucléaire : Modeling of dissolution phenomena in early and late phases of a severe accident. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2009. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2009ECAP0008.

Council of Science Editors:

Belloni J. Modélisation des phénomènes de dissolution lors des phases précoces et avancées d'un accident grave de réacteur nucléaire : Modeling of dissolution phenomena in early and late phases of a severe accident. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2009. Available from: http://www.theses.fr/2009ECAP0008

22. Beaudoux, Xavier. Dissolution réductrice d'oxydes de lanthanides et de PuO2 assistée par ultrasons : Reductive dissolution of lanthanide oxides and PuO2 assisted by ultrasound.

Degree: Docteur es, Chimie et physicochimie des matériaux, 2015, Montpellier

URL: http://www.theses.fr/2015MONTS046

►

Dans le cadre du programme nucléaire français, le combustible des réacteurs est constitué d'oxydes d'uranium ou d'oxydes mixtes d'uranium et de plutonium (appelé MOX). Des… (more)

▼

Dans le cadre du programme nucléaire français, le combustible des réacteurs est constitué d'oxydes d'uranium ou d'oxydes mixtes d'uranium et de plutonium (appelé MOX). Des développements sont constamment effectués sur les procédés de retraitement de ces combustibles afin d'optimiser la récupération des matières valorisables et de minimiser le volume des déchets. Lors de la dissolution des MOX, la quantité de fines de dissolution résiduelles riches en Pu est parfois importante malgré l'utilisation de conditions chimiques dures (oxydantes et corrosives). La difficulté à dissoudre des lots de PuO2 déclarés non conformes lors de la fabrication du MOX peut également représenter un verrou technologique. Dans ce contexte, la sonochimie est envisagée comme alternative aux méthodes actuelles de dissolution de PuO2, ou de MOX enrichi en Pu. Dans un premier temps, des travaux de dissolution sonochimique ont été réalisés sur un analogue inactif de PuO2, à savoir CeO2. Les résultats obtenus ont ainsi permis d'orienter les expériences de dissolution de PuO2. En conditions réductrices et acides, beaucoup plus douces que celles utilisées industriellement, la dissolution totale de ces deux oxydes a été effectuée en quelques heures. Parallèlement, une étude connexe a montré qu'il est possible de dissoudre totalement des oxydes mixtes de lanthanides à base de Ce, par un procédé de dissolution sonocatalytique et réductrice en présence de nanoparticules de Pt. La dissolution est d'autant plus rapide que la teneur en lanthanides trivalents est importante au sein de l'oxyde. Enfin, une dernière partie a été consacrée à la dissolution sous agitation magnétique d'oxydes à base de Ce en présence ou non de métaux nobles, dans des milieux faiblement acides contenant des molécules naturelles réductrices. Dans ces conditions, une dissolution totale, rapide et sélective de ces oxydes a été observée. Ces deux dernières études présentent un intérêt dépassant le cadre du nucléaire et applicable au recyclage de matériaux industriels (pots catalytiques, piles à combustible…).

In the French nuclear program, the reactor fuel consists of uranium oxides or uranium plutonium mixed oxides (called MOX). Developments are constantly made on the resulting reprocessing of these fuels in order to optimize the recovery of reusable materials and to minimize the waste volume. In the case of MOX dissolution, the amount of Pu-rich dissolution residues is sometimes high despite the use of hard chemical conditions (oxidizing and corrosive). The difficulty to dissolve PuO2 batches declared non-standard during the fabrication of MOX can also be a technological barrier. In this context, sonochemistry can be considered as an alternative to current methods of dissolution of PuO2 or Pu enriched MOX. First, experiments of sonochemical dissolution were performed on an inactive analogue of PuO2, namely CeO2. The results were then used as a working basis for the dissolution of PuO2. Under reducing and acidic conditions, much milder than those used industrially, the complete…

Advisors/Committee Members: Nikitenko, Sergueï (thesis director), Leturcq, Gilles (thesis director).

Subjects/Keywords: Sonochimie; Dissolution; Plutonium; Oxyde; Ultrasons; Sonochemistry; Dissolution; Plutonium; Oxide; Ultrasound

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Beaudoux, X. (2015). Dissolution réductrice d'oxydes de lanthanides et de PuO2 assistée par ultrasons : Reductive dissolution of lanthanide oxides and PuO2 assisted by ultrasound. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2015MONTS046

Chicago Manual of Style (16^th Edition):

Beaudoux, Xavier. “Dissolution réductrice d'oxydes de lanthanides et de PuO2 assistée par ultrasons : Reductive dissolution of lanthanide oxides and PuO2 assisted by ultrasound.” 2015. Doctoral Dissertation, Montpellier. Accessed January 23, 2021. http://www.theses.fr/2015MONTS046.

MLA Handbook (7^th Edition):

Beaudoux, Xavier. “Dissolution réductrice d'oxydes de lanthanides et de PuO2 assistée par ultrasons : Reductive dissolution of lanthanide oxides and PuO2 assisted by ultrasound.” 2015. Web. 23 Jan 2021.

Vancouver:

Beaudoux X. Dissolution réductrice d'oxydes de lanthanides et de PuO2 assistée par ultrasons : Reductive dissolution of lanthanide oxides and PuO2 assisted by ultrasound. [Internet] [Doctoral dissertation]. Montpellier; 2015. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2015MONTS046.

Council of Science Editors:

Beaudoux X. Dissolution réductrice d'oxydes de lanthanides et de PuO2 assistée par ultrasons : Reductive dissolution of lanthanide oxides and PuO2 assisted by ultrasound. [Doctoral Dissertation]. Montpellier; 2015. Available from: http://www.theses.fr/2015MONTS046

New Jersey Institute of Technology

23. Parekh, Shrutiben Rameshbhai. Dissolution of disintegrating solid dosage forms in a modified dissolution testing apparatus 2.

Degree: MSin Pharmaceutical Engineering - (M.S.), Chemical, Biological and Pharmaceutical Engineering, 2011, New Jersey Institute of Technology

URL: https://digitalcommons.njit.edu/theses/93

► Dissolution tests are routinely carried out in the pharmaceutical industry to determine the dissolution rate of solid dosage forms. Dissolution testing serves as a… (more)

▼ Dissolution tests are routinely carried out in the pharmaceutical industry to determine the dissolution rate of solid dosage forms. Dissolution testing serves as a surrogate for drug bioavailability through in vitro–in vivo correlation (IVIVR), and it additionally helps in guiding the development of new formulations and in assessing lot-to-lot consistency, thus ensuring product quality. The United States Pharmacopoeia (USP) Dissolution Testing Apparatus 2 is the device most commonly used for this purpose. Despite its widespread use, dissolution testing using this apparatus remains susceptible to significant error and test failures. There is documented evidence that this apparatus is sensitive to several geometric variables that can affect the release profile of oral dosage forms, including tablet location during the dissolution process. In this work, the dissolution profiles of disintegrating calibrator tablets containing Prednisone were experimentally determined using two systems, i.e., a Standard USP Dissolution Testing Apparatus 2 (Standard System) and a Modified Standard USP Dissolution Testing Apparatus 2 (Modified System) in which the impeller was located 8 mm off the vessel centerline. The dissolving tablets were located at different off-center positions on the vessel bottom to test the effect of tablet location in these two systems. Tablet dissolution in the Standard System was found to be strongly dependent on tablet location, as previously reported by this and other research groups. This apparatus appears to generate variable results that may not be associated with the tablets undergoing testing but with the hydrodynamic characteristics of the apparatus itself and the location of the tablet on the vessel bottom. However, when the same experiments were conducted in the Modified System, the dissolution profiles for the same tablets were found to be nearly completely insensitive to tablet location. The dissolution process in the Modified System was faster than that in the Standard System because of the improved mixing performance of the Modified System resulting from the non-symmetrical placement of the impeller. However, when the Modified System was operated at 35 rpm, the dissolution profiles for centrally located tablets were found to be very similar to those for the Standard System operating at 50 rpm. Unlike the Standard System however, the dissolution profiles obtained at 35 rpm in the Modified System were found to be insensitive to tablet location. It can be concluded that the newly proposed Modified System for dissolution testing is a simple and yet robust and valid alternative to the current dissolution testing practice using the Standard USP Dissolution Testing Apparatus. Advisors/Committee Members: Piero M. Armenante, Laurent Simon, Gerard Bredael.

Subjects/Keywords: Dissolution tests; Dissolution profiles; Chemical Engineering; Pharmaceutics and Drug Design

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Parekh, S. R. (2011). Dissolution of disintegrating solid dosage forms in a modified dissolution testing apparatus 2. (Thesis). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/theses/93

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Parekh, Shrutiben Rameshbhai. “Dissolution of disintegrating solid dosage forms in a modified dissolution testing apparatus 2.” 2011. Thesis, New Jersey Institute of Technology. Accessed January 23, 2021. https://digitalcommons.njit.edu/theses/93.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Parekh, Shrutiben Rameshbhai. “Dissolution of disintegrating solid dosage forms in a modified dissolution testing apparatus 2.” 2011. Web. 23 Jan 2021.

Vancouver:

Parekh SR. Dissolution of disintegrating solid dosage forms in a modified dissolution testing apparatus 2. [Internet] [Thesis]. New Jersey Institute of Technology; 2011. [cited 2021 Jan 23]. Available from: https://digitalcommons.njit.edu/theses/93.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Parekh SR. Dissolution of disintegrating solid dosage forms in a modified dissolution testing apparatus 2. [Thesis]. New Jersey Institute of Technology; 2011. Available from: https://digitalcommons.njit.edu/theses/93

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Univerzitet u Beogradu

24. Nikolić, Jelena D. Hemijska postojanost polifosfatnog stakla u različitim sredinama.

Degree: Tehnološko-metalurški fakultet, 2017, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:15815/bdef:Content/get

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Tehnološko inženjerstvo - Hemijsko inženjerstvo / Technological engineering - Chemical engineering

Proces rastvaranja stakla je veoma kompleksan fenomen, koji zavisi od više faktora: sastava stakla,… (more)

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Tehnološko inženjerstvo - Hemijsko inženjerstvo / Technological engineering - Chemical engineering

Proces rastvaranja stakla je veoma kompleksan fenomen, koji zavisi od više faktora: sastava stakla, postupka njegovog dobijanja, površine stakla, temperature, pH rastvarača, brzine protoka rastvarača, vremena dejstva i dr. Ovaj proces se odvija u više faza, te je moguće kontrolisati ukupno vreme procesa, favorizovanjem ili suzbijanjem neke od ovih faza. Iako fosfatna stakla imaju odlične optičke osobine, njihova šira primena je bila ograničena zbog njihove niske hemijske postojanosti. Poslednjih godina, fosfatna stakla su privukla pažnju istraživača zbog toga što poseduju bioaktivnost i biokompatibilnost, što ih svrstava u red materijala pogodnih za primenu u medicini, stomatologiji i poljoprivredi. Upravo zbog toga je veoma značajno da se poznaje ponašanje ovih stakala pri procesu rastvaranja u različitim rastvaračima. Hemijska aktivnost fosfatnih stakala u procesima koji nastaju pri kontaktu sa raznim rastvorima pomaže pri dizajniranju i proizvodnji novih materijala. Dosadašnja istraživanja u oblasti hemijske postojanosti neorganskih stakala su pokazala da i manje postojana stakla mogu da budu od velike koristi u slučaju njihove kontrolisane rastvorljivosti. Glavna prednost stakala je što im se lako može promeniti hemijski sastav. Promenom sastava, odnosno uvođenjem novih komponenti u sastav stakla, moguće je kontrolisati kinetiku i mehanizam rastvaranja. U ovoj doktorskoj disertaciji prikazani su rezultati proučavanja fenomena rastvaranja polifosfatnog stakla sastava: 45 P2O5·3 SiO2·25 K2O·15 CaO·10 MgO·1 ZnO·1 MnO u dejonizovanoj vodi, 2 % rastvoru limunske kiseline i simuliranoj telesnoj tečnosti (SBF) u temperaturnom intervalu 15-50 C za vremena 0,5-720 h. Ispitivanja su izvršena pri stacionarnim uslovima u nezasićenim rastvorima. U ispitivanjima su korišćene dve grupe praškastih uzoraka granulacija: 0,1-0,3 i 0,3-0,65 mm i kompaktni uzorci stakla. Za analizu rezultata eksperimenata korišćene su metode: atomska apsorpciona spektroskopija (AAS), spektrofotometrijska metoda (SF), infracrvena spektroskopija (FTIR), diferencijalno-termijska analiza (DTA), skenirajuća elektronska mikroskopija (SEM), energetska disperziona spektroskopija (EDS), analiza specifične površine staklenog praha i određivanje pH vrednosti sredine...

Advisors/Committee Members: Grujić, Snežana, 1964-.

Subjects/Keywords: polyphosphate glass; dissolution; dissolution rate; mechanism and kinetics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nikolić, J. D. (2017). Hemijska postojanost polifosfatnog stakla u različitim sredinama. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:15815/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nikolić, Jelena D. “Hemijska postojanost polifosfatnog stakla u različitim sredinama.” 2017. Thesis, Univerzitet u Beogradu. Accessed January 23, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:15815/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nikolić, Jelena D. “Hemijska postojanost polifosfatnog stakla u različitim sredinama.” 2017. Web. 23 Jan 2021.

Vancouver:

Nikolić JD. Hemijska postojanost polifosfatnog stakla u različitim sredinama. [Internet] [Thesis]. Univerzitet u Beogradu; 2017. [cited 2021 Jan 23]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:15815/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nikolić JD. Hemijska postojanost polifosfatnog stakla u različitim sredinama. [Thesis]. Univerzitet u Beogradu; 2017. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:15815/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Gatuingt, Laure. Etude des mécanismes de formation des patines manganésifères des grès du château de Lunéville : Study of the formation mechanisms of the palace of Lunéville sandstones’ manganese patinas.

Degree: Docteur es, Géomatériaux, 2017, Université Paris-Est

URL: http://www.theses.fr/2017PESC1085

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La formation de patines noires riches en fer et/ou manganèse sur les édifices en grès est un phénomène observé pour une grande variété d’environnements mais… (more)

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La formation de patines noires riches en fer et/ou manganèse sur les édifices en grès est un phénomène observé pour une grande variété d’environnements mais qui n’est pas encore totalement compris. Le château de Lunéville, situé dans l’est de la France, est un cas d’étude intéressant puisqu'il présente des patines apparues pour différentes conditions : certaines semblent s’être formées naturellement alors que d’autres se sont développées sur des pierres ayant été exposées à un incendie. Ces dernières ont connu une élévation de leur température de surface, mais ont surtout été soumises à de grandes quantités d’eau lors de l’intervention des pompiers. Ce travail de thèse vise à mieux comprendre le phénomène de formation des patines en étudiant différents faciès de grès prélevés sur le château de Lunéville et en carrière. Afin d’appréhender l’influence des paramètres intrinsèques aux grès, des faciès patinés et non patinés ont été comparés d’un point de vue pétrophysique, chimique et minéralogique en s’appuyant sur des techniques d’analyse de laboratoire (microscopies optique et électronique avec sonde d’analyse dispersive en énergie, diffraction des rayons X, spectrométrie Raman, mesures de perméabilité, porosité et capillarité, ...), et sur de grands instruments (analyses par émission de rayons X induits par des particules (PIXE) sur l’accélérateur de proton AGLAE, analyses en micro-diffraction des rayons X et micro-spectrométrie d’absorption X (XANES) au synchrotron SOLEIL). En complément de cette caractérisation des blocs de pierre, les patines formées dans différents environnements ont également été comparées afin de dégager les paramètres extrinsèques dominants. Enfin, l’aspect dynamique de la libération du manganèse par les grès a été étudié, d’une part en menant des expériences de dissolution pour plusieurs pH, d’autre part en montrant qu’il était possible de recréer une patine de manganèse en laboratoire, par imbibition d’une éprouvette de grès. Les résultats obtenus permettent de proposer un modèle de formation des patines basé sur la dissolution des phases manganésifères initialement présentes dans les grès, puis la migration des ions libérés en solution dans le milieu poreux vers la surface des pierres

The formation of iron and/or manganese black patina on sandstone buildings is a phenomenon observed for various environments but which is not fully understood yet. The palace of Lunéville, in eastern France, is an interesting example because it has patinas that have developed in different conditions : some seem to have grown naturally while others have appeared on stones which were exposed to a fire. These stones experienced an increase of their surface temperature, but most of all, they were subjected to a substantial volume of water as part of attempts to extinguish the fire. The goal of this thesis is to understand the formation of the patinas by investigating different sandstone facies collected from the palace of Lunéville and from quarry. In order to understand the influence of the sandstones…

Advisors/Committee Members: Rossano, Stéphanie (thesis director).

Subjects/Keywords: Grès; Manganèse; Patine; Xanes; Dissolution; Sandstone; Manganese; Patina; Xanes; Dissolution

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gatuingt, L. (2017). Etude des mécanismes de formation des patines manganésifères des grès du château de Lunéville : Study of the formation mechanisms of the palace of Lunéville sandstones’ manganese patinas. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2017PESC1085

Chicago Manual of Style (16^th Edition):

Gatuingt, Laure. “Etude des mécanismes de formation des patines manganésifères des grès du château de Lunéville : Study of the formation mechanisms of the palace of Lunéville sandstones’ manganese patinas.” 2017. Doctoral Dissertation, Université Paris-Est. Accessed January 23, 2021. http://www.theses.fr/2017PESC1085.

MLA Handbook (7^th Edition):

Gatuingt, Laure. “Etude des mécanismes de formation des patines manganésifères des grès du château de Lunéville : Study of the formation mechanisms of the palace of Lunéville sandstones’ manganese patinas.” 2017. Web. 23 Jan 2021.

Vancouver:

Gatuingt L. Etude des mécanismes de formation des patines manganésifères des grès du château de Lunéville : Study of the formation mechanisms of the palace of Lunéville sandstones’ manganese patinas. [Internet] [Doctoral dissertation]. Université Paris-Est; 2017. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2017PESC1085.

Council of Science Editors:

Gatuingt L. Etude des mécanismes de formation des patines manganésifères des grès du château de Lunéville : Study of the formation mechanisms of the palace of Lunéville sandstones’ manganese patinas. [Doctoral Dissertation]. Université Paris-Est; 2017. Available from: http://www.theses.fr/2017PESC1085

26. Joulié, Marion. Mécanisme de dissolution de matériaux actifs d'électrodes de type LiNi1/3Mn1/3Co1/3O2 d'accumulateurs Li-ion en vue de leur recyclage : Dissolution mechanism of LiNi1/3Mn1/3Co1/3O2 electrode-like active material from Li-ion batteries to recycle them.

Degree: Docteur es, Chimie séparative matériaux et procédés, 2015, Montpellier, Ecole nationale supérieure de chimie

URL: http://www.theses.fr/2015ENCM0011

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La voie hydrométallugique représente une alternative pour la récupération des métaux de valeur tels que le nickel et le cobalt contenus dans les batteries Li-ion… (more)

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La voie hydrométallugique représente une alternative pour la récupération des métaux de valeur tels que le nickel et le cobalt contenus dans les batteries Li-ion usagées. La première étape du procédé hydrométallurgique, l'étape de lixiviation a été optimisée grâce à l'étude du comportement du matériau actif d'électrode positive LiNi1/3Mn1/3Co1/3O2 (NMC) qui s'avère être le candidat idéal pour les batteries de véhicules électriques. Tout d'abord, l'étude des aspects thermodynamiques de la réaction de dissolution a permis de prédire le comportement du NMC dans divers acides. Puis, l'approche cinétique a conduit à l'élucidation du mécanisme se produisant lors de l'étape de lixiviation et à la mise en évidence de l'étape cinétiquement déterminante de la dissolution. Ce mécanisme a par la suite été généralisé aux autres matériaux couramment rencontrés dans les batteries Li-ion. L'impact d'agents réducteurs minéraux, organiques et métalliques pour promouvoir la dissolution du NMC a été évalué. Cette approche compare l'effet de réactifs à faible (acides sulfurique et chlorhydrique) et fort (acides citrique, oxalique et formique et peroxyde d'hydrogène) pouvoir réducteur ainsi que celui du cuivre et de l'aluminium provenant des collecteurs de courants des batteries Li-ion. Cette étude soulève le fort intérêt de l'emploi des collecteurs de courant présents de manière inhérente dans la fraction traitée par hydrométallurgie.

Basic hydrometallurgical routes represent an alternative to recover valuable metals such as nickel and cobalt from spent Li-ion batteries. The first step of hydrometallurgical process, lixiviation step is optimized by studying the behaviour of LiNi1/3Mn1/3Co1/3O2 (NMC) positive electrode active material, due to its good performances which make it an adequate candidate for the electric vehicles. First of all, the study of thermodynamic aspects allows predicting the behaviour of NMC material in various acidic media. Then, the kinetic approach leads to define the mechanism occurring during the leaching step and to outline the rate-limiting step of the dissolution. The reductive effect of mineral, organic and metallic reducing agents to promote leaching of NMC material is evaluated. The approach comparatively evaluates the reducing power impact of weak (sulfuric and hydrochloric acids), strong reducing agents (citric, oxalic and formic acids and hydrogen peroxide) and copper and aluminum from Li-ion batteries current collectors. This work points out the strong interest to advantageously use current collectors inherently present in the fraction treated by hydrometallurgy.

Advisors/Committee Members: Meyer, Daniel (thesis director).

Subjects/Keywords: Mécanisme; Dissolution; Batteries; Li-Ion; Mechanism; Dissolution; Batteries; Li-Ion; 540

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Joulié, M. (2015). Mécanisme de dissolution de matériaux actifs d'électrodes de type LiNi1/3Mn1/3Co1/3O2 d'accumulateurs Li-ion en vue de leur recyclage : Dissolution mechanism of LiNi1/3Mn1/3Co1/3O2 electrode-like active material from Li-ion batteries to recycle them. (Doctoral Dissertation). Montpellier, Ecole nationale supérieure de chimie. Retrieved from http://www.theses.fr/2015ENCM0011

Chicago Manual of Style (16^th Edition):

Joulié, Marion. “Mécanisme de dissolution de matériaux actifs d'électrodes de type LiNi1/3Mn1/3Co1/3O2 d'accumulateurs Li-ion en vue de leur recyclage : Dissolution mechanism of LiNi1/3Mn1/3Co1/3O2 electrode-like active material from Li-ion batteries to recycle them.” 2015. Doctoral Dissertation, Montpellier, Ecole nationale supérieure de chimie. Accessed January 23, 2021. http://www.theses.fr/2015ENCM0011.

MLA Handbook (7^th Edition):

Joulié, Marion. “Mécanisme de dissolution de matériaux actifs d'électrodes de type LiNi1/3Mn1/3Co1/3O2 d'accumulateurs Li-ion en vue de leur recyclage : Dissolution mechanism of LiNi1/3Mn1/3Co1/3O2 electrode-like active material from Li-ion batteries to recycle them.” 2015. Web. 23 Jan 2021.

Vancouver:

Joulié M. Mécanisme de dissolution de matériaux actifs d'électrodes de type LiNi1/3Mn1/3Co1/3O2 d'accumulateurs Li-ion en vue de leur recyclage : Dissolution mechanism of LiNi1/3Mn1/3Co1/3O2 electrode-like active material from Li-ion batteries to recycle them. [Internet] [Doctoral dissertation]. Montpellier, Ecole nationale supérieure de chimie; 2015. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2015ENCM0011.

Council of Science Editors:

Joulié M. Mécanisme de dissolution de matériaux actifs d'électrodes de type LiNi1/3Mn1/3Co1/3O2 d'accumulateurs Li-ion en vue de leur recyclage : Dissolution mechanism of LiNi1/3Mn1/3Co1/3O2 electrode-like active material from Li-ion batteries to recycle them. [Doctoral Dissertation]. Montpellier, Ecole nationale supérieure de chimie; 2015. Available from: http://www.theses.fr/2015ENCM0011

27. Tocino, Florent. Contrôle microstructural des réactions rédox à l'interface solide/solution lors de la dissolution d'oxydes mixtes à base d'uranium (IV) : Microstructural control of redox reactions at the solid/solution interface during the dissolution of uranium (IV) - based mixed oxides.

Degree: Docteur es, Chimie séparative, matériaux et procédés, 2015, Montpellier

URL: http://www.theses.fr/2015MONTS247

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Dans le cadre de l’utilisation potentielle d’oxydes mixtes d’actinides au sein des réacteurs nucléaires de 3ème et 4ème générations, des solutions solides de formules générales… (more)

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Dans le cadre de l’utilisation potentielle d’oxydes mixtes d’actinides au sein des réacteurs nucléaires de 3ème et 4ème générations, des solutions solides de formules générales U1-xThxO2, U1-xCexO2-y, U0,75Nd0,25O1,875, U0,75Gd0,25O1,875 et Th0,75Nd0,25O1,875 ont été préparées par conversion thermique de précurseurs oxalate. Préalablement à l’évaluation de la durabilité chimique des matériaux, une étape de frittage a été entreprise afin d’obtenir des pastilles denses présentant diverses propriétés physico-chimiques et microstructurales d’intérêt (composition, homogénéité, taux de densification, …) L’étude multiparamétrique de la dissolution, conduite en milieux nitrique, sulfurique et chlorhydrique a souligné l’impact important de la composition chimique au sein du matériau sur la durabilité chimique des échantillons. En effet, plusieurs paramètres (ordres partiels par rapport à l’activité en protons, énergie d’activation apparente, …) ont confirmé une modification significative du mécanisme de dissolution prépondérant pour les échantillons enrichis en uranium. Par ailleurs, le rôle important joué par certaines espèces azotées à l’interface solide/solution a également été démontré. L’évolution de l’interface solide/solution (surface réactive, composition) en cours de dissolution a également été suivie à travers une étude operando par Microscopie Electronique à Balayage en mode Environnemental. Cette étude a souligné l’existence de zones préférentielles de dissolution (jonctions triples, joints de grains, porosités inter- et intragranulaires) pour les échantillons les moins riches en uranium ; laquelle s’accompagne d’une forte augmentation de la surface réactive. En raison d’un phénomène prépondérant d’oxydation de l’uranium(IV) à l’interface, la dissolution des échantillons enrichis en uranium apparaît nettement plus homogène.

In the field of the use of actinides mixed oxides as potential fuels for the Gen(III) and Gen(IV) nuclear reactors, solid solutions with general formula U1-xThxO2, U1-xCexO2-y, U0.75Nd0.25O1.875, U0.75Gd0.25O1.875 and Th0.75Nd0.25O1.875 were prepared by thermal conversion of oxalate precursors. Dense pellets exhibiting various physico-chemical and microstructural properties (in terms of composition, homogeneity, densification rate, …) were prepared through sintering then submitted to dissolution tests.The multiparametric study of the dissolution, performed in nitric, sulfuric and hydrochloric media clearly underlined the important effect of the chemical composition on the chemical durability of the samples. Indeed, several parameters (including partial order related to proton activity, apparent activation energy) confirmed the significant modification of the preponderant dissolution mechanism for uranium-enriched samples. Moreover, the role of various nitrogen-based species was evidenced at the solid/solution interface.The evolving of solid/solution interfaces (reactive surface area, composition) during dissolution was monitored by the means of operando ESEM experiments. Preferential…

Advisors/Committee Members: Dacheux, Nicolas (thesis director).

Subjects/Keywords: Dissolution; Oxydes; Rédox; Interfaces; Microstructure; Dissolution; Oxides; Redox; Interfaces; Microstructure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tocino, F. (2015). Contrôle microstructural des réactions rédox à l'interface solide/solution lors de la dissolution d'oxydes mixtes à base d'uranium (IV) : Microstructural control of redox reactions at the solid/solution interface during the dissolution of uranium (IV) - based mixed oxides. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2015MONTS247

Chicago Manual of Style (16^th Edition):

Tocino, Florent. “Contrôle microstructural des réactions rédox à l'interface solide/solution lors de la dissolution d'oxydes mixtes à base d'uranium (IV) : Microstructural control of redox reactions at the solid/solution interface during the dissolution of uranium (IV) - based mixed oxides.” 2015. Doctoral Dissertation, Montpellier. Accessed January 23, 2021. http://www.theses.fr/2015MONTS247.

MLA Handbook (7^th Edition):

Tocino, Florent. “Contrôle microstructural des réactions rédox à l'interface solide/solution lors de la dissolution d'oxydes mixtes à base d'uranium (IV) : Microstructural control of redox reactions at the solid/solution interface during the dissolution of uranium (IV) - based mixed oxides.” 2015. Web. 23 Jan 2021.

Vancouver:

Tocino F. Contrôle microstructural des réactions rédox à l'interface solide/solution lors de la dissolution d'oxydes mixtes à base d'uranium (IV) : Microstructural control of redox reactions at the solid/solution interface during the dissolution of uranium (IV) - based mixed oxides. [Internet] [Doctoral dissertation]. Montpellier; 2015. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2015MONTS247.

Council of Science Editors:

Tocino F. Contrôle microstructural des réactions rédox à l'interface solide/solution lors de la dissolution d'oxydes mixtes à base d'uranium (IV) : Microstructural control of redox reactions at the solid/solution interface during the dissolution of uranium (IV) - based mixed oxides. [Doctoral Dissertation]. Montpellier; 2015. Available from: http://www.theses.fr/2015MONTS247

28. Ziouane, Yannis. Dissolution de poudres d'oxydes mixtes (U,Pu)O2 monophasées : Dissolution of mixed oxide powders (U, Pu)O2.

Degree: Docteur es, Chimie et physicochimie des matériaux, 2017, Montpellier

URL: http://www.theses.fr/2017MONTS005

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Le principal objectif de cette étude est d'acquérir des données de base sur la dissolution de composés (U,Pu)O2 en appui à la compréhension des phénomènes… (more)

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Le principal objectif de cette étude est d'acquérir des données de base sur la dissolution de composés (U,Pu)O2 en appui à la compréhension des phénomènes intervenant lors des étapes de dissolution des combustibles MOX des filières de réacteurs à eaux légères et à neutrons rapides sodium. Les études antérieures, en particulier sur des combustibles MOX non irradiés, ont mis en évidence la complexité d'une compréhension des mécanismes de dissolution par une approche directe. En effet, la dissolution dépend d'un grand nombre de paramètres, qui sont principalement les conditions chimiques d'attaque (acidité, température, ...), mais surtout les caractéristiques physico-chimiques de la pastille considérée (teneur en plutonium, homogénéité de la teneur en plutonium, microstructure, géométrie, ...), la majorité d'entre elles étant fortement dépendantes du procédé de fabrication utilisé. Pour éviter l'obtention de réponses moyennées du fait de la présence d'une hétérogénéité de la répartition en Pu au sein des pastilles, on se propose de réaliser une étude sur des poudres de composés monophasés de stœchiométrie parfaitement définie (U et Pu) et de morphologie parfaitement déterminée. Une approche par étapes a permis de déterminer les différents paramètres clé déterminant les cinétiques de dissolution de ces oxydes d’actinides (surface spécifique, taille des cristallites, teneur en Pu, activité des ions nitrate, température de dissolution, énergie d’activation).Une loi cinétique globale permettant de décrire les cinétiques de dissolution des oxydes U1-xPuxO2 a été établie à partir de 45 essais différents (avec 0≤x≤1). Elle décrit les cinétiques de dissolution obtenues à toutes teneurs en plutonium et morphologies de l’oxyde, dans des gammes de températures variant de 50 à 95°C et des intervalles d’acidités variant de 1,5 à 8,5 mol/L. Le modèle ainsi créé décrit assez précisément la cinétique de dissolution de n’importe quel oxyde U1-xPuxO2 alors qu’il existe plus de cinq ordres de grandeurs d’écart entre les cinétiques de dissolution de l’UO2 et du PuO2. Des essais complémentaires sur des composés monophasés ont été menés validant le caractère prédictif du modèle.

The main objective of this study is to acquire data on the dissolution of (U, Pu)O2 compounds to support the understanding of the phenomena occurring during the dissolution steps of MOX fuels irradiated in light water or sodium fast reactors. Previous studies, in particular on unirradiated MOX fuel, have highlighted the complexity of understanding the dissolution mechanisms through a direct approach. Indeed, the dissolution depends on a large number of parameters, which are mainly chemical dissolution parameters (acidity, temperature…). But it also depends on the physico-chemical characteristics of the fuel pellets (plutonium content, homogeneity of the plutonium content, microstructure, geometry...), a majority of which being highly dependent on the manufacturing process used. To avoid getting averaged responses due to the presence of heterogeneity in the Pu…

Advisors/Committee Members: Leturcq, Gilles (thesis director).

Subjects/Keywords: Chimie des matériaux; Dissolution; Combustible; Materials chemistry; Dissolution; Fuel

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ziouane, Y. (2017). Dissolution de poudres d'oxydes mixtes (U,Pu)O2 monophasées : Dissolution of mixed oxide powders (U, Pu)O2. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2017MONTS005

Chicago Manual of Style (16^th Edition):

Ziouane, Yannis. “Dissolution de poudres d'oxydes mixtes (U,Pu)O2 monophasées : Dissolution of mixed oxide powders (U, Pu)O2.” 2017. Doctoral Dissertation, Montpellier. Accessed January 23, 2021. http://www.theses.fr/2017MONTS005.

MLA Handbook (7^th Edition):

Ziouane, Yannis. “Dissolution de poudres d'oxydes mixtes (U,Pu)O2 monophasées : Dissolution of mixed oxide powders (U, Pu)O2.” 2017. Web. 23 Jan 2021.

Vancouver:

Ziouane Y. Dissolution de poudres d'oxydes mixtes (U,Pu)O2 monophasées : Dissolution of mixed oxide powders (U, Pu)O2. [Internet] [Doctoral dissertation]. Montpellier; 2017. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2017MONTS005.

Council of Science Editors:

Ziouane Y. Dissolution de poudres d'oxydes mixtes (U,Pu)O2 monophasées : Dissolution of mixed oxide powders (U, Pu)O2. [Doctoral Dissertation]. Montpellier; 2017. Available from: http://www.theses.fr/2017MONTS005

NSYSU

29. Lai, Ang-chih. Numerical model of carbon dissolution in liquid iron.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459

► In this study, a numerical model is built to investigate the factors on carbon dissolution rate and develop a lump system for carbon particle dissolution… (more)

Subjects/Keywords: Numerical simulation; liquid iron; carbon dissolution

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lai, A. (2014). Numerical model of carbon dissolution in liquid iron. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lai, Ang-chih. “Numerical model of carbon dissolution in liquid iron.” 2014. Thesis, NSYSU. Accessed January 23, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lai, Ang-chih. “Numerical model of carbon dissolution in liquid iron.” 2014. Web. 23 Jan 2021.

Vancouver:

Lai A. Numerical model of carbon dissolution in liquid iron. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Jan 23]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lai A. Numerical model of carbon dissolution in liquid iron. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Utah

30. Kweon, Hyukmin. Mineralogical and petrophysical changes in carbon dioxide sequestration.

Degree: PhD, Chemical Engineering, 2015, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3917/rec/1595

► Carbon dioxide (CO2) sequestration is a technology being implemented with the potential to mitigate anthropogenic CO2 emissions. CO2 injection into underground brine-saturated formations requires a… (more)

▼ Carbon dioxide (CO2) sequestration is a technology being implemented with the potential to mitigate anthropogenic CO2 emissions. CO2 injection into underground brine-saturated formations requires a good understanding of the ensuing mineralogical changes. Core floods and batch reactor studies involving three different rock types such as sandstone, limestone, and dolomite were conducted at realistic sequestration conditions in this study. Inductively Coupled Plasma Mass Spectrometer (ICP-MS) was used to obtain effluent brine concentrations as brine and CO2 were injected/reacted with the different rock types. Analysis of the cores by X-ray Diffraction (XRD), Quantitative Evaluation of Minerals by Scanning Electron Microscopy (QEMSCAN), and Micro-Computed Tomography (Micro-CT) complemented the aqueous-phase compositional measurements. Selected porosity and permeability measurement were also performed using a helium porosimeter. Core flooding revealed the importance of iron chemistry in CO2 sequestration in sandstone formations. Significant dissolution of iron bearing minerals was observed with slight increase in porosity. This would have implications in the near well bore injection region. Dissolution with wormhole creation was seen in limestone and dolomite experiments. The changes in mineralogy were modeled using TOUGHREACT, a reactive transport geochemical simulator. The experimental changes observed due to changes in flow rates could not easily be reproduced in the model indicating a more complex underlying processor, even at this scale. The batch experiments confirmed the types of mineral dissolutions observed in the core studies. Additionally, these experiments helped quantity the effect of surface area (higher surface area leading to more dissolution) and revealed that the heterogeneity of limestone and dolomite permit reactions to occur in the interior. In contrast, sandstone reactions appeared limited to the surface. Surface area measurements showed that the new porosity generated was characterized by a smaller pore size distribution in comparison to the unreacted one.

Subjects/Keywords: Carbon dioxide; Dissolution; Iron chemistry; Sequestration; TOUGHREACT

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kweon, H. (2015). Mineralogical and petrophysical changes in carbon dioxide sequestration. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3917/rec/1595

Chicago Manual of Style (16^th Edition):

Kweon, Hyukmin. “Mineralogical and petrophysical changes in carbon dioxide sequestration.” 2015. Doctoral Dissertation, University of Utah. Accessed January 23, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3917/rec/1595.

MLA Handbook (7^th Edition):

Kweon, Hyukmin. “Mineralogical and petrophysical changes in carbon dioxide sequestration.” 2015. Web. 23 Jan 2021.

Vancouver:

Kweon H. Mineralogical and petrophysical changes in carbon dioxide sequestration. [Internet] [Doctoral dissertation]. University of Utah; 2015. [cited 2021 Jan 23]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3917/rec/1595.

Council of Science Editors:

Kweon H. Mineralogical and petrophysical changes in carbon dioxide sequestration. [Doctoral Dissertation]. University of Utah; 2015. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3917/rec/1595

Open Access Theses and Dissertations