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You searched for subject:(Gas Surface Reactivity). Showing records 1 – 3 of 3 total matches.

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Colorado State University

1. Blechle, Joshua M. Investigations of nitrogen oxide plasmas : fundamental chemistry and surface reactivity and monitoring student perceptions in a general chemistry recitation: Fundamental chemistry and surface reactivity: Monitoring student perceptions in a general chemistry recitation.

Degree: PhD, Chemistry, 2017, Colorado State University

Part I of this dissertation focuses on investigations of nitrogen oxide plasma systems. With increasing concerns over the environmental presence of NxOy species, there is growing interest in utilizing plasma-assisted conversion techniques. Advances, however, have been limited because of the lack of knowledge regarding the fundamental chemistry of these plasma systems. Understanding the kinetics and thermodynamics of processes in these systems is vital to realizing their potential in a range of applications. Unraveling the complex chemical nature of these systems, however, presents numerous challenges. As such, this work serves as a foundational step in the diagnostics and assessment of these NxOy plasmas. The partitioning of energy within the plasma system is essential to unraveling these complications as it provides insight into both gas and surface reactivity. To obtain this information, techniques such as optical emission spectroscopy (OES), broadband absorption spectroscopy (BAS), and laser induced fluorescence (LIF) were utilized to determine species energetics (vibrational, rotational, translational temperatures). These temperature data provide mechanistic insight and establish the relationships between system parameters and energetic outcomes. Additionally, these data are also correlated to surface reactivity data collected with the Imaging of Radicals Interacting with Surfaces (IRIS) technique. IRIS data demonstrate the relationship between internal temperatures of radicals and their observed surface scatter coefficients (S), the latter of which is directly related to surface reactivity (R) [R = 1-S]. Furthermore, time-resolved (TR) spectroscopic techniques, specifically TR-OES, revealed kinetic trends in NO and N2 formation from a range of precursors (NO, N2O, N2/O2). By examining the rate constants associated with the generation and destruction of various plasma species we can investigate possible mechanistic implications. All told, such data provides unparalleled insight into the chemistry of these plasma systems. Part II of this work is focused on understanding the efficacy of a general chemistry recitation program. Such programs can be an valuable tool for improving students’ problem solving skills and understanding using methods that are difficult to implement in large lecture settings. Here, general chemistry students at Colorado State University participated in a variety of recitation activities throughout the first semester of a 2-semester general chemistry sequence, including peer-led exercises, games, and scaffolded worksheets. Through weekly surveys, students were asked to evaluate and assess recitation activities for both interest and effectiveness as part of their course homework. Also included in these survey assignments were content questions relevant to the weekly themes, providing a measure of student learning of recitation topics. Student opinions were correlated with content retention, and these data were compared against student responses to a pre-survey… Advisors/Committee Members: Fisher, Ellen R. (advisor), Levinger, Nancy E. (committee member), Henry, Charles S. (committee member), Weinberger, Christopher R. (committee member).

Subjects/Keywords: General Chemistry Recitation; Plasma Diagnostics; Gas-Surface Reactivity; Student Attitudes; Nitrogen Oxide Plasmas

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APA (6th Edition):

Blechle, J. M. (2017). Investigations of nitrogen oxide plasmas : fundamental chemistry and surface reactivity and monitoring student perceptions in a general chemistry recitation: Fundamental chemistry and surface reactivity: Monitoring student perceptions in a general chemistry recitation. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/178878

Chicago Manual of Style (16th Edition):

Blechle, Joshua M. “Investigations of nitrogen oxide plasmas : fundamental chemistry and surface reactivity and monitoring student perceptions in a general chemistry recitation: Fundamental chemistry and surface reactivity: Monitoring student perceptions in a general chemistry recitation.” 2017. Doctoral Dissertation, Colorado State University. Accessed October 20, 2019. http://hdl.handle.net/10217/178878.

MLA Handbook (7th Edition):

Blechle, Joshua M. “Investigations of nitrogen oxide plasmas : fundamental chemistry and surface reactivity and monitoring student perceptions in a general chemistry recitation: Fundamental chemistry and surface reactivity: Monitoring student perceptions in a general chemistry recitation.” 2017. Web. 20 Oct 2019.

Vancouver:

Blechle JM. Investigations of nitrogen oxide plasmas : fundamental chemistry and surface reactivity and monitoring student perceptions in a general chemistry recitation: Fundamental chemistry and surface reactivity: Monitoring student perceptions in a general chemistry recitation. [Internet] [Doctoral dissertation]. Colorado State University; 2017. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/10217/178878.

Council of Science Editors:

Blechle JM. Investigations of nitrogen oxide plasmas : fundamental chemistry and surface reactivity and monitoring student perceptions in a general chemistry recitation: Fundamental chemistry and surface reactivity: Monitoring student perceptions in a general chemistry recitation. [Doctoral Dissertation]. Colorado State University; 2017. Available from: http://hdl.handle.net/10217/178878


University of Alberta

2. Zikovsky, Janik. Nanometer scale connections to semiconductor surfaces.

Degree: PhD, Department of Physics, 2009, University of Alberta

Extending electronic devices beyond the limitations of current micro-electronics manufacturing will require detailed knowledge of how to make contacts to semiconductor surfaces. In this work, we investigated several methods by which such connections to silicon surfaces could be achieved. Scanning tunneling microscopy (STM) was our main experimental tool, allowing direct imaging of the surfaces at the atomic level. First, the growth of self-forming linear nanostructures of organic molecules on silicon surfaces offers a possibility of creating devices with hybrid organic-silicon functionality. We have studied the growth of many different molecules on a variety of hydrogen-terminated silicon surfaces: H-Si(100)-2x1, H-Si(100)-3x1, and H-Si(111)-1x1. We found molecular growth patterns affected by steric crowding, by sample doping level, or by exposure to ion-pump created radicals. We formed the first contiguous "L-shaped" molecular lines, and used an external electric field to direct molecular growth. We attempted to study a novel method for nanoscale information transfer along molecular lines based on excitation energy transfer. The second part of the work focuses on the development and use of a new multiple-probe STM instrument. The design and the custom STM control software written for it are described. Connections to Si surfaces were achieved with a combination of lithographically defined metal contacts and STM tips. Two-dimensional surface conductivity of the Si(111)-7x7 surface was measured, and the effect of modifying the surface with organic molecules was investigated. A novel method, scanning tunneling fractional current imaging (STFCI), was developed to further study surface conductance. This method allowed us to determine, for the first time, that the resistance of steps on the Si(111)-7x7 surface is significantly higher than that of the surface alone.

Subjects/Keywords: gas dosing; surface reactivity; molecular lines; silicon surfaces; nanostructures; surface conductivity; contacts; scanning tunneling microscopy; Si(111)-7x7

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APA (6th Edition):

Zikovsky, J. (2009). Nanometer scale connections to semiconductor surfaces. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cr56n218c

Chicago Manual of Style (16th Edition):

Zikovsky, Janik. “Nanometer scale connections to semiconductor surfaces.” 2009. Doctoral Dissertation, University of Alberta. Accessed October 20, 2019. https://era.library.ualberta.ca/files/cr56n218c.

MLA Handbook (7th Edition):

Zikovsky, Janik. “Nanometer scale connections to semiconductor surfaces.” 2009. Web. 20 Oct 2019.

Vancouver:

Zikovsky J. Nanometer scale connections to semiconductor surfaces. [Internet] [Doctoral dissertation]. University of Alberta; 2009. [cited 2019 Oct 20]. Available from: https://era.library.ualberta.ca/files/cr56n218c.

Council of Science Editors:

Zikovsky J. Nanometer scale connections to semiconductor surfaces. [Doctoral Dissertation]. University of Alberta; 2009. Available from: https://era.library.ualberta.ca/files/cr56n218c


Université de Lorraine

3. Grandjean, Mathilde. Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines : Study of reactivity and hydration of particles obtained by carbonation of alkaline brines.

Degree: Docteur es, Géosciences, 2013, Université de Lorraine

Cette thèse porte sur l'étude de la caractérisation et le traitement de saumures alcalines. La carbonatation directe de saumures résiduaires (SR), par introduction d'une partie du CO2 issu de fumées industrielles, est réalisée dans un souhait de réduction des émissions de CO2 et en vue d'une valorisation potentielle des produits obtenus. Cette recherche se concentre sur l'étude des composés carbonatés, l'objectif général est d'établir le lien entre la réactivité des carbonates et leur valorisation (ici, désulfuration de fumées acides). Les SR sont complexes, l'étude de leur composition chimique et minéralogique a été réalisée en partie par spectroscopie Raman afin de mettre en évidence les interactions OH-Cl dans les échantillons humides. Les différents hydroxydes sont consommés au cours de la carbonatation pour précipiter des carbonates de calcium (calcite, aragonite). La composition chimique détermine les réactions de carbonatation alors que les paramètres physiques influencent la vitesse des réactions ainsi que la morphologie et la pureté des carbonates. L'évolution des phases au cours de la carbonatation des SR a été suivie par spectroscopie et un premier modèle statistique de prédiction des concentrations en carbonates a été développé. La deuxième partie de ce travail porte sur la caractérisation des carbonates obtenus et des paramètres, tel que l'hydratation, pouvant influencer leur valorisation. L'importance de l'hydratation dans la réactivité des produits DECALCO a été observée de l'échelle microscopique au pilote semi-industriel. Les essais de désulfuration de fumées acides ont été menés avec des taux de conversion du SO2 atteignant 65 à 70

This study is a contribution to the characterization and the treatment of alkaline industrial wastes. The direct carbonation of residual brines (RB) by CO2 bubbling results in a gas emission reduction and a potentially valorization of resulting products. This research was focused on carbonate products. The main objective is to link reactivity and valorization (here, desulfurization of industrial fumes). The RB are complex, their chemical and mineralogical composition was studied in particular by Raman spectroscopy to monitor OH-Cl interaction in humid samples. The different hydroxides phases are consumed during carbonation to precipitate calcium carbonates (calcite and aragonite). The chemical composition of RB determines the main part of the reaction of carbonation whereas physical parameters influence the reaction kinetics, the by-products morphology and purity. The feasibility of on-line monitoring of the phases evolution during carbonation using spectroscopy has been validated and a first statistical model for the prediction of carbonate concentration has been developed. The second part of this works concerns the characterization of precipitated carbonates and some parameters as hydration which can influence their valorization. The importance of hydration on the carbonates reactivity was observed in microscopy and at pilot scale. Desulfurization tests of…

Advisors/Committee Members: Filippov, Lev (thesis director), Pelletier, Manuel (thesis director).

Subjects/Keywords: Saumure; Carbonatation; Hydratation; Réactivité; Désulfuration; Hydroxychlorure de calcium; CO2; Gaz acide; Carbonate de calcium; Polymorphisme; Surface; Spectroscopie Raman; Brine; Carbonation; Hydration; Reactivity; Desulfurization; Calcium hydroxychloride; CO2; Acid gas; Calcium carbonate; Polymorphism; Surface; Raman spectroscopy; 665.7; 628.53

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

APA (6th Edition):

Grandjean, M. (2013). Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines : Study of reactivity and hydration of particles obtained by carbonation of alkaline brines. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2013LORR0311

Chicago Manual of Style (16th Edition):

Grandjean, Mathilde. “Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines : Study of reactivity and hydration of particles obtained by carbonation of alkaline brines.” 2013. Doctoral Dissertation, Université de Lorraine. Accessed October 20, 2019. http://www.theses.fr/2013LORR0311.

MLA Handbook (7th Edition):

Grandjean, Mathilde. “Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines : Study of reactivity and hydration of particles obtained by carbonation of alkaline brines.” 2013. Web. 20 Oct 2019.

Vancouver:

Grandjean M. Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines : Study of reactivity and hydration of particles obtained by carbonation of alkaline brines. [Internet] [Doctoral dissertation]. Université de Lorraine; 2013. [cited 2019 Oct 20]. Available from: http://www.theses.fr/2013LORR0311.

Council of Science Editors:

Grandjean M. Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines : Study of reactivity and hydration of particles obtained by carbonation of alkaline brines. [Doctoral Dissertation]. Université de Lorraine; 2013. Available from: http://www.theses.fr/2013LORR0311

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