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Queensland University of Technology
1.
Locke, Ashley.
Morphological investigations of supported titania photocatalysts.
Degree: 2010, Queensland University of Technology
URL: https://eprints.qut.edu.au/38904/ 
► Due in no small part to an increasing need to augment existing water purification strategies, the synthesis of titania photocatalysts has been under considerable examination.…
(more)
▼ Due in no small part to an increasing need to augment existing water purification strategies, the synthesis of titania photocatalysts has been under considerable examination. However, in order to make the use of titania photocatalysts commercially viable there needs to be an increase in the efficiency of the catalysts while decreasing the potential toxicity. Due to its high porosity and novel optical properties, inverse opal titania derived from colloidal crystal templating offers one of the most efficient solutions. While a number of synthesis methods for inverse opal titania have been presented in the literature, the co�]deposition method offers the most effective method of generating the relative large areas of inverse opal material. The factors which affect the codeposition method and the mechanism by which titania inverse opals form in general remain relatively unstudied. This manuscript presents an examination of the morphology of inverse opals generated by the co�]deposition method while proposing a mechanism by which the inverse structures form.
Subjects/Keywords: titania photocatalysts
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APA (6th Edition):
Locke, A. (2010). Morphological investigations of supported titania photocatalysts. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/38904/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Locke, Ashley. “Morphological investigations of supported titania photocatalysts.” 2010. Thesis, Queensland University of Technology. Accessed April 10, 2021.
https://eprints.qut.edu.au/38904/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Locke, Ashley. “Morphological investigations of supported titania photocatalysts.” 2010. Web. 10 Apr 2021.
Vancouver:
Locke A. Morphological investigations of supported titania photocatalysts. [Internet] [Thesis]. Queensland University of Technology; 2010. [cited 2021 Apr 10].
Available from: https://eprints.qut.edu.au/38904/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Locke A. Morphological investigations of supported titania photocatalysts. [Thesis]. Queensland University of Technology; 2010. Available from: https://eprints.qut.edu.au/38904/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
2.
Yun, Jae Sung.
Mechanisms of TiO2 Nanotube Fabrication by Anodisation.
Degree: Materials Science & Engineering, 2011, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/51481
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10168/SOURCE02?view=true
► Titania nanotubes have been grown on titanium metal substrates in solutions of ethylene glycol and NH4F by anodisation using the variables of time (5-180 min)…
(more)
▼ Titania nanotubes have been grown on titanium metal substrates in solutions of ethylene glycol and NH4F by anodisation using the variables of time (5-180 min) and voltage (15-75 V). The nanotubes were characterised in terms of morphology, shape, length, and diameter by scanning electron microscopy and transmission electron microscopy. The nanotubes were analysed principally in terms of current density versus time plots.The main finding of the work is that, instead of the universally accepted existence of a three-stage growth mechanism, there are five discernable growth stages, each of which can be identified in the current density vs time plots. These were confirmed experimentally by detailed examination of the nanotubes at each stage of growth. Finally, each stage was described and defined phenomenologically.The effect of voltage (as a function of time) was:• 15 V: Insufficient to generate nanotubes• 30-60V: The curves for current density vs time could be differentiated into five distinct stages:Stage I: Initial formation of coherent oxide layerStage II: Pore formationStage III: Pore widening and impingementStage IV: Nanotube growth from driving force of satisfaction of Ohm’s lawStage V: Continued nanotube growth from dissolution and oxide growth• 75 V: The curves for current density vs time were different:Stages I-III: As aboveStage IV: Partial dissolution of barrier layer, with nanotube growth rate depending on competition between opposing resistance changes from barrier layer thickness decrease and nanotube length increaseStage V: Establishment of a thinner barrier layer of constant thickness and rapid nanotube growth, which resulted from the enhanced ionic transport associated with the higher current (lower resistance at constant voltageThe two main differences between previously published work and the present works are as follows:• At ≤60 V, the constant current density of Stage IV results from the driving force of an overbiased circuit to satisfy Ohm’s law. This is done through an increase in circuit resistance resulting from the growth of insulating nanotubes. The higher the voltage, the longer it takes to satisfy Ohm’s law and hence the longer the nanotubes. That is, the length of Stage IV is proportional to the amount nanotube growth.• At 75 V, when Ohm’s law is satisfied at the onset of Stage IV, the increase in current density during Stage IV results from the partial dissolution of the barrier layer and so there is a decrease in the circuit resistance. When the dissolution and oxide formation rates equalise, a new equilibrium barrier layer thickness is established, at which point rapid nanotube growth commences. With the thin barrier layer of lower resistance, the high ionic transport from the high current causes rapid nanotube growth. That is, the steepness of Stage V, which reflects the increasing resistance from the increasing nanotube length, is proportional to the amount of nanotube growth.
Advisors/Committee Members: Sorrell, Chris, Materials Science & Engineering, Faculty of Science, UNSW.
Subjects/Keywords: anodization; titania; nanotube; anodisation
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APA (6th Edition):
Yun, J. S. (2011). Mechanisms of TiO2 Nanotube Fabrication by Anodisation. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/51481 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10168/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Yun, Jae Sung. “Mechanisms of TiO2 Nanotube Fabrication by Anodisation.” 2011. Masters Thesis, University of New South Wales. Accessed April 10, 2021.
http://handle.unsw.edu.au/1959.4/51481 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10168/SOURCE02?view=true.
MLA Handbook (7th Edition):
Yun, Jae Sung. “Mechanisms of TiO2 Nanotube Fabrication by Anodisation.” 2011. Web. 10 Apr 2021.
Vancouver:
Yun JS. Mechanisms of TiO2 Nanotube Fabrication by Anodisation. [Internet] [Masters thesis]. University of New South Wales; 2011. [cited 2021 Apr 10].
Available from: http://handle.unsw.edu.au/1959.4/51481 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10168/SOURCE02?view=true.
Council of Science Editors:
Yun JS. Mechanisms of TiO2 Nanotube Fabrication by Anodisation. [Masters Thesis]. University of New South Wales; 2011. Available from: http://handle.unsw.edu.au/1959.4/51481 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10168/SOURCE02?view=true
University of Oklahoma
3.
Omotoso, Taiwo.
CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS.
Degree: PhD, 2015, University of Oklahoma
URL: http://hdl.handle.net/11244/23318
► Growing environmental concerns has necessitated the development of cleaner and renewable sources of energy such as biomass. Bio-oil derived from lignocellulosic biomass is a promising…
(more)
▼ Growing environmental concerns has necessitated the development of cleaner and renewable sources of energy such as biomass. Bio-oil derived from lignocellulosic biomass is a promising source for producing renewable chemicals and fuels, however due to the instability of this complex mixture, with its high oxygen content contributing mainly to this, catalytic upgrading is required to improve on undesirable properties. Therefore not only is it necessary to decrease the oxygen content of bio-oil, a good upgrading strategy should preserve valuable carbon in the liquid. Metals supported on reducible oxides hold considerable promise for upgrading pyrolysis vapors, as they are capable of converting corrosive light compounds such as acetic acid to the chemical building block acetone as well as catalyzing the deoxygenation and transalkylation of larger phenolic compounds to produce alkyl-aromatics. The combination of reducible oxides such as TiO2 coupled with metals such as Ru can result in a complex catalyst. Potential active sites include the sites on the metal surface, the highly reducible sites at the Ru/TiO2 interface, traditional acid sites on the TiO2 surface, and defects on the TiO2 support. While the roles of the various types of active sites for Ru/TiO2 catalysts have been studied in detail for reactions such as Fischer Tropsch synthesis, little is known regarding the role of these active sites for the conversion of lignin-derived phenolic compounds. In this dissertation, the author will use a combination of model compound studies coupled with catalyst modifications to better understand the reactivity of the various phenolic functional groups and also furfural, an important compound derived from the sugar fraction of biomass feed stocks, over the active sites present on Ru/TiO2 .
In the first section of this dissertation, the role of TiO2 crystal morphology phase – anatase and rutile- on resistance to Ru agglomeration during different catalyst pre-treatment conditions and the impact on the conversion of guaiacol, a phenolic compound with both methoxy and hydroxyl functions is investigated. The superior ability of the rutile TiO2 phase in stabilizing ruthenium particles compared to anatase was investigated. This is essential to designing Ru catalysts that have enhanced stability during high temperature oxidation treatments. These chapters will also give insights into the nature of active sites on the Ru/TiO2 catalyst responsible for guaiacol deoxygenation. Differentiation between Ru/TiO2 interfacial sites and oxygen vacancies on the TiO2 support for the conversion of guaiacol was achieved. In other chapters, the conversion of important phenolic compounds such as anisole, catechol and m-cresol was addressed. By utilizing a series of Ru catalysts with varying support types (SiO2, C, TiO2); TiO2 support phase (anatase, rutile and a mixture of both phases) and Ru particle sizes, the role of the various sites on the Ru/TiO2 catalyst for the conversion of these compounds was elucidated. These chapters demonstrate that…
Advisors/Committee Members: Crossley, Steven (advisor), White, Robert (committee member), Resasco, Daniel (committee member), Lobban, Lance (committee member), Wang, Bin (committee member).
Subjects/Keywords: Catalysis; Biofuels; Ruthenium; Titania
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APA (6th Edition):
Omotoso, T. (2015). CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/23318
Chicago Manual of Style (16th Edition):
Omotoso, Taiwo. “CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed April 10, 2021.
http://hdl.handle.net/11244/23318.
MLA Handbook (7th Edition):
Omotoso, Taiwo. “CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS.” 2015. Web. 10 Apr 2021.
Vancouver:
Omotoso T. CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/11244/23318.
Council of Science Editors:
Omotoso T. CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/23318
4.
Luciana Valgas de Souza.
Filmes de ormosils contendo polioxometalatos dopados com nanopartículas de titânia: adsorção de lipídeos e formação de biofilmes de Escherichia coli.
Degree: 2014, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/75/75134/tde-26012015-102647/
► Neste trabalho foram preparados materiais híbridos do tipo silicatos organicamente modificados (ormosils) contendo fosfotungstato, [PW12O40]-3 e dopados com nanopartículas de TiO2. O objetivo é obter…
(more)
▼ Neste trabalho foram preparados materiais híbridos do tipo silicatos organicamente modificados (ormosils) contendo fosfotungstato, [PW12O40]-3 e dopados com nanopartículas de TiO2. O objetivo é obter uma ação sinérgica destes dois fotocatalisadores na prevenção de formação de biofilmes e/ou sua fotodegradação. O fotocatalisador principal no sistema é o fosfotungstato, sendo o co-adjuvante o TiO2. Sendo assim, procurou-se manter a concentração deste no menor nível possível. Os materiais foram caracterizados por espectroscopias vibracionais, espectroscopia de fotoelétrons de raios X (XPS), Fluorescência de Raios X, Microscopia de força atômica e Microscopia eletrônica de varredura (MEV). Os filmes não mostraram eficácia na fotodegradação de biomoléculas como fosfolipídios encontrados na membrana celular. Os ensaios de inibição de crescimento de biofilmes de Escherichia coli sobre os ormosils mostraram que a maior inibição de bactérias é do filme
contendo maior teor de nanopartículas de titânia portanto, são bons candidatos para filmes e revestimentos bactericidas/bacteriostáticos a serem usados em máscaras respiratórias, revestimentos de superfícies em salas de cirurgia e em filtros de ar em sistemas fechados (sistemas de ar condicionado e ventilação em geral).
This thesis deals with hybrid materials named organically modified silicates (Ormosils) with phosphotungstate, [PW12O40]-3 , and doped with TiO2 nanoparticles. The aim was to achieve a synergic action between both photocatalysts resulting on a more efficient coating for inhibition of the biofilm growing and/or its photodegradation. The photocatalyst in main system is the phosphotungstate, being the co-adjuvant the TiO2. Therefore, we tried to maintain the concentration of this at the lowest level possible The materials were characterized by vibrational spectroscopies, X-Ray Photoelectron Spectroscopy, X- ray Fluorescence Spectroscopy, Atomic Force Microscopy and
Scanning Electron Microscopy. The films were unable to photodegradate biomolecules films such as phospholipids as well as they display interesting inhibition capacity against formation of biofilm of E.Coli bacteria. The tests of inhibition of growth of Escherichia coli biofilms on the ormosils showed that a greater inhibition of bacterias exists in the film containing higher content of nanoparticles of titania. Therefore, they are good candidates for bactericidal films and coatings to be used in respirators, surface coatings in surgery rooms and air filters in closed systems (systems of air conditioning and ventilation in general).
Advisors/Committee Members: Ubirajara Pereira Rodrigues Filho, Tânia Beatriz Creczynski Pasa, Ana Maria Pereira Lopes Redondo Botelho do Rego, Sidney José Lima Ribeiro.
Subjects/Keywords: biofilme; ormosils; polioxometalatos; titania; biofilm; ormosil; polioxomethalates; titania
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APA (6th Edition):
Souza, L. V. d. (2014). Filmes de ormosils contendo polioxometalatos dopados com nanopartículas de titânia: adsorção de lipídeos e formação de biofilmes de Escherichia coli. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/75/75134/tde-26012015-102647/
Chicago Manual of Style (16th Edition):
Souza, Luciana Valgas de. “Filmes de ormosils contendo polioxometalatos dopados com nanopartículas de titânia: adsorção de lipídeos e formação de biofilmes de Escherichia coli.” 2014. Doctoral Dissertation, University of São Paulo. Accessed April 10, 2021.
http://www.teses.usp.br/teses/disponiveis/75/75134/tde-26012015-102647/.
MLA Handbook (7th Edition):
Souza, Luciana Valgas de. “Filmes de ormosils contendo polioxometalatos dopados com nanopartículas de titânia: adsorção de lipídeos e formação de biofilmes de Escherichia coli.” 2014. Web. 10 Apr 2021.
Vancouver:
Souza LVd. Filmes de ormosils contendo polioxometalatos dopados com nanopartículas de titânia: adsorção de lipídeos e formação de biofilmes de Escherichia coli. [Internet] [Doctoral dissertation]. University of São Paulo; 2014. [cited 2021 Apr 10].
Available from: http://www.teses.usp.br/teses/disponiveis/75/75134/tde-26012015-102647/.
Council of Science Editors:
Souza LVd. Filmes de ormosils contendo polioxometalatos dopados com nanopartículas de titânia: adsorção de lipídeos e formação de biofilmes de Escherichia coli. [Doctoral Dissertation]. University of São Paulo; 2014. Available from: http://www.teses.usp.br/teses/disponiveis/75/75134/tde-26012015-102647/
University of Pretoria
5.
[No author].
Investigation into the effect of cooling conditions on
the particle size distribution of titania slag
.
Degree: 2009, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-07162008-075705/
► Titania slag is a feedstock to the pigment industry, which in turn provides titania pigment to producers of everyday products like paper, cosmetics and toothpaste.…
(more)
▼ Titania slag is a feedstock to the pigment industry,
which in turn provides
titania pigment to producers of everyday
products like paper, cosmetics and toothpaste.
Titania slag is the
primary product of the pyrometallurgical process of ilmenite
smelting – the other products being iron and CO gas.
Titania slag
is typically tapped from the furnace into blocks of approximately
20 tons. After cooling these blocks are crushed and milled to size
fractions suitable for the processes of the pigment producers.
These processes are broadly grouped into two types of technology:
the chloride route (during which
titania slag is reacted with
chlorine and subsequently re oxidised thereby removing the
impurities) and the sulphate route (in this process the
titania
slag is purified after dissolving the slag in sulphuric acid). Due
to the nature of these two processes, several specifications are
imposed on the quality of the
titania slags. The fluidised-bed
technology used in the chloride process limits the size
distribution of the slag to between 106 µm and 850 µm. Ilmenite
smelting industries consequently crush and mill the
titania slag to
below 850 µm. The fraction below 106 µm is then sold to the
sulphate market. Since the coarser chloride grade product is the
more valuable product, slag producers continuously strive to
improve the ratio between the coarser and finer fractions. This
study reports on parameters which influence the particle size
distribution of
titania slags and therefore the split between the
coarser (more valuable) and finer (less valuable) products.
Pilot-scale slag ingots were used to identify chemical and process
variables which influence the yield of coarser material. The
microstructure of as-cast and milled slag was examined, and
indicated a role of silicate phases in the crushing behaviour.
Industrial-scale slag ingots were used to test whether the roles of
tapping rate and water cooling (as identified from the pilot-scale
ingots) also applied under industrial conditions. A numerical
method was applied to estimate the thermal conductivity of the
solidified slag (from measurements on pilot-scale ingots), and to
predict the cooling and solidification behaviour of
industrial-scale ingots. The study concludes that the chemical
composition and cooling conditions of the slag block play central
roles in the final particle size distribution of the
slag.
Advisors/Committee Members: Prof P C Pistorius (advisor).
Subjects/Keywords: Ilmenite smelting;
Solidification;
Pseudobrookite;
Titania slag;
UCTD
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APA (6th Edition):
author], [. (2009). Investigation into the effect of cooling conditions on
the particle size distribution of titania slag
. (Doctoral Dissertation). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-07162008-075705/
Chicago Manual of Style (16th Edition):
author], [No. “Investigation into the effect of cooling conditions on
the particle size distribution of titania slag
.” 2009. Doctoral Dissertation, University of Pretoria. Accessed April 10, 2021.
http://upetd.up.ac.za/thesis/available/etd-07162008-075705/.
MLA Handbook (7th Edition):
author], [No. “Investigation into the effect of cooling conditions on
the particle size distribution of titania slag
.” 2009. Web. 10 Apr 2021.
Vancouver:
author] [. Investigation into the effect of cooling conditions on
the particle size distribution of titania slag
. [Internet] [Doctoral dissertation]. University of Pretoria; 2009. [cited 2021 Apr 10].
Available from: http://upetd.up.ac.za/thesis/available/etd-07162008-075705/.
Council of Science Editors:
author] [. Investigation into the effect of cooling conditions on
the particle size distribution of titania slag
. [Doctoral Dissertation]. University of Pretoria; 2009. Available from: http://upetd.up.ac.za/thesis/available/etd-07162008-075705/
University of California – Berkeley
6.
Nguyen, Que Anh.
Electrochemical Synthesis and Structural Characterization of Titania Nanotubes.
Degree: Materials Science & Engineering, 2010, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/6bx1p016
► Titania nanotubes have emerged as an exciting new material with a wide array of applications such as sensors, dye sensitized solar cells, and batteries due…
(more)
▼ Titania nanotubes have emerged as an exciting new material with a wide array of applications such as sensors, dye sensitized solar cells, and batteries due to their semi-conducting nature, high surface area, and distinct morphology. The nanotubes, synthesized electrochemically in a fluoride-containing electrolyte, are vertically aligned, close-packed, organized structures, with similar diameter and length. The formation mechanism responsible for the organized nanopore/nanotube arrays were examined by studying the effects of processing parameters (anodization voltage, synthesis time, electrolyte composition, substrate surface conditions, etc..) on the growth and structure of electrochemically synthesized titania. Characterization of the nanotube's crystal structure, morphology, and oxide composition were performed via cross-sectional and high-resolution transmission electron microscopy (TEM), micro x-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and electron energy loss spectroscopy (EELS). Experimental results from the synthesis and characterization efforts lead to a novel planar-interface-breakdown model to describe the initiation of organized arrays of nanopores and nanotubes formed via anodization of titanium. It is proposed that the initiation step is triggered by compositional changes in the oxide and electrolyte, near the interface region, that break down the planar surface. In the electrolyte, the compositional changes are enhanced by ionic species, such as fluoride that form complexes with metal cations. In the oxide, the compositional gradient results from depletion of metal cations near the oxide/electrolyte interface. The proposed mechanism indicates that, in addition to the compositional gradient, the initiation of nanopores is controlled by the potential gradient in the oxide as well as the oxides dissolution rate. The initiation step is crucial not only for the growth processes that proceed during anodization, but also for the organization of the pores that result from synthesis. This mechanism, although formulated for the case of anodization of Ti, may be extended to other porous anodic oxide systems.
Subjects/Keywords: Materials Science; electrochemical synthesis; nanostructures; titania
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APA (6th Edition):
Nguyen, Q. A. (2010). Electrochemical Synthesis and Structural Characterization of Titania Nanotubes. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/6bx1p016
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nguyen, Que Anh. “Electrochemical Synthesis and Structural Characterization of Titania Nanotubes.” 2010. Thesis, University of California – Berkeley. Accessed April 10, 2021.
http://www.escholarship.org/uc/item/6bx1p016.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nguyen, Que Anh. “Electrochemical Synthesis and Structural Characterization of Titania Nanotubes.” 2010. Web. 10 Apr 2021.
Vancouver:
Nguyen QA. Electrochemical Synthesis and Structural Characterization of Titania Nanotubes. [Internet] [Thesis]. University of California – Berkeley; 2010. [cited 2021 Apr 10].
Available from: http://www.escholarship.org/uc/item/6bx1p016.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nguyen QA. Electrochemical Synthesis and Structural Characterization of Titania Nanotubes. [Thesis]. University of California – Berkeley; 2010. Available from: http://www.escholarship.org/uc/item/6bx1p016
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
7.
Pourjavad, Navid.
Wear behavior of flame sprayed nanostructured titania
coatings.
Degree: MS, Department of Mechanical Engineering, 2011, University of Alberta
URL: https://era.library.ualberta.ca/files/z890rt28w
► Various pressures of compressed air were introduced into the flame spraying torch and the protective coatings of nanostructured and conventional titania (TiO2) were deposited on…
(more)
▼ Various pressures of compressed air were introduced
into the flame spraying torch and the protective coatings of
nanostructured and conventional titania (TiO2) were deposited on
low carbon steel substrates. Performance of the coatings was
studied using scanning electron microscopy (SEM), hardness
measurement, porosity measurement and the best coating was selected
for further analyses. A Nanostructured and conventional samples
were exposed to ASTM G65 and C633 standard tests and the outcome
was analyzed using confocal and electron microscopy. A
nanostructured coating was found to outperform the conventional
counterpart due to the presence of a bimodal microstructure, which
increases the plastic deformation and crack resistance of the
ceramic. The nanostructured coating was analyzed using X-Ray
diffraction (XRD) and eventually its crack propagation resistance
was quantified. The coating was also tested in a highly corrosive
H2S environment and Energy-dispersive X-ray spectroscopy (EDX)
verified its fair resistance against that
environment.
Subjects/Keywords: Titania; Coating; Wear; Flame spray; Nano
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APA ·
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Manager
APA (6th Edition):
Pourjavad, N. (2011). Wear behavior of flame sprayed nanostructured titania
coatings. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/z890rt28w
Chicago Manual of Style (16th Edition):
Pourjavad, Navid. “Wear behavior of flame sprayed nanostructured titania
coatings.” 2011. Masters Thesis, University of Alberta. Accessed April 10, 2021.
https://era.library.ualberta.ca/files/z890rt28w.
MLA Handbook (7th Edition):
Pourjavad, Navid. “Wear behavior of flame sprayed nanostructured titania
coatings.” 2011. Web. 10 Apr 2021.
Vancouver:
Pourjavad N. Wear behavior of flame sprayed nanostructured titania
coatings. [Internet] [Masters thesis]. University of Alberta; 2011. [cited 2021 Apr 10].
Available from: https://era.library.ualberta.ca/files/z890rt28w.
Council of Science Editors:
Pourjavad N. Wear behavior of flame sprayed nanostructured titania
coatings. [Masters Thesis]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/z890rt28w
McMaster University
8.
Whinton, Marlena E.
Polymerized Silicone Microemulsions.
Degree: PhD, 2016, McMaster University
URL: http://hdl.handle.net/11375/19111
► Microemulsions are nanostructured dispersions that have unique properties, which make them attractive for applications such as biomaterials, drug delivery, and nanoparticle synthesis. The behaviour of…
(more)
▼ Microemulsions are nanostructured dispersions that have unique properties, which make them attractive for applications such as biomaterials, drug delivery, and nanoparticle synthesis. The behaviour of hydrocarbon microemulsions and their applications have been extensively studied, however, there have been very few studies in the preparation or the polymerization of silicone microemulsions. Silicone microemulsions offer a unique template by which to create novel nanoporous silicone elastomers and/or hydrogels. The prevalent use of silicones in biomaterials, coatings, and personal care (to name a few) make the development of silicone-based microemulsions of particular interest.
The aim of thesis research was to polymerize silicone microemulsions and to understand the factors that contribute to retaining initial template morphology in the polymeric product. Chapter Two of this thesis focuses on the preparation of silicone microemulsions containing a non-polymerizable and polymerizable trisiloxane surfactant, respectively. Formulations were prepared and characterized by electrical conductivity to determine the microemulsion structure type. Formulations located in the bicontinuous region of the phase diagram were polymerized, producing transparent silicone elastomers.
The focus of Chapter Three was to determine the tolerance of silicone microemulsions to selected chemistry that is relevant to silicone polymers. Previous work done in the field of polymerizing silicone microemulsions has been based on radical polymerization processes. There are no reports that examine the polymerization of a silicone microemulsion by room temperature vulcanization (RTV), a common process for creating silicone elastomers. We aimed to better understand the effects of RTV cure on morphology retention from the liquid to polymeric product to determine if this type of chemistry could be used in the formation of nanoporous silicone elastomers either on its own or in conjunction with a radical polymerization process. In order to understand the effects of an RTV process on polymer structure, we examined the effect of the variable components (necessary for the RTV cure) on the silicone microemulsion template. Small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) were used as tools to characterize materials prior to and after cure. Silicone microemulsions that were cured using the RTV process produced nanoporous polymeric elastomers, however, the initial bicontinuous microemulsion template was not retained. RTV cured microemulsions retained the bicontinuous structure if the RTV cure was preceded by a photopolymerization reaction to “lock-in” surfactant monomers at the oil/water interface.
Chapter Four explores the use of silicone microemulsions as a reaction vehicle in the formation of nano-TiO2 particles. The focus of this chapter was the exploitation of microemulsion droplets and bicontinuous structures that were designed to retard TiO2 particle formation in situ. Titanium isopropoxide (TTIP) was incorporated into…
Advisors/Committee Members: Brook, Michael A., Chemistry and Chemical Biology.
Subjects/Keywords: Microemulsions; Polymerization; Silicone; Nanostructured Materials; Nano-titania
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APA (6th Edition):
Whinton, M. E. (2016). Polymerized Silicone Microemulsions. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/19111
Chicago Manual of Style (16th Edition):
Whinton, Marlena E. “Polymerized Silicone Microemulsions.” 2016. Doctoral Dissertation, McMaster University. Accessed April 10, 2021.
http://hdl.handle.net/11375/19111.
MLA Handbook (7th Edition):
Whinton, Marlena E. “Polymerized Silicone Microemulsions.” 2016. Web. 10 Apr 2021.
Vancouver:
Whinton ME. Polymerized Silicone Microemulsions. [Internet] [Doctoral dissertation]. McMaster University; 2016. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/11375/19111.
Council of Science Editors:
Whinton ME. Polymerized Silicone Microemulsions. [Doctoral Dissertation]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/19111
University of Pretoria
9.
Kotze, Hanlie.
Investigation
into the effect of cooling conditions on the particle size
distribution of titania slag.
Degree: Materials Science and
Metallurgical Engineering, 2009, University of Pretoria
URL: http://hdl.handle.net/2263/26336
► Titania slag is a feedstock to the pigment industry, which in turn provides titania pigment to producers of everyday products like paper, cosmetics and toothpaste.…
(more)
▼ Titania slag is a feedstock to the pigment industry,
which in turn provides
titania pigment to producers of everyday
products like paper, cosmetics and toothpaste.
Titania slag is the
primary product of the pyrometallurgical process of ilmenite
smelting – the other products being iron and CO gas.
Titania slag
is typically tapped from the furnace into blocks of approximately
20 tons. After cooling these blocks are crushed and milled to size
fractions suitable for the processes of the pigment producers.
These processes are broadly grouped into two types of technology:
the chloride route (during which
titania slag is reacted with
chlorine and subsequently re oxidised thereby removing the
impurities) and the sulphate route (in this process the
titania
slag is purified after dissolving the slag in sulphuric acid). Due
to the nature of these two processes, several specifications are
imposed on the quality of the
titania slags. The fluidised-bed
technology used in the chloride process limits the size
distribution of the slag to between 106 µm and 850 µm. Ilmenite
smelting industries consequently crush and mill the
titania slag to
below 850 µm. The fraction below 106 µm is then sold to the
sulphate market. Since the coarser chloride grade product is the
more valuable product, slag producers continuously strive to
improve the ratio between the coarser and finer fractions. This
study reports on parameters which influence the particle size
distribution of
titania slags and therefore the split between the
coarser (more valuable) and finer (less valuable) products.
Pilot-scale slag ingots were used to identify chemical and process
variables which influence the yield of coarser material. The
microstructure of as-cast and milled slag was examined, and
indicated a role of silicate phases in the crushing behaviour.
Industrial-scale slag ingots were used to test whether the roles of
tapping rate and water cooling (as identified from the pilot-scale
ingots) also applied under industrial conditions. A numerical
method was applied to estimate the thermal conductivity of the
solidified slag (from measurements on pilot-scale ingots), and to
predict the cooling and solidification behaviour of
industrial-scale ingots. The study concludes that the chemical
composition and cooling conditions of the slag block play central
roles in the final particle size distribution of the
slag.
Advisors/Committee Members: Prof P C Pistorius (advisor).
Subjects/Keywords: Ilmenite
smelting;
Solidification;
Pseudobrookite; Titania
slag;
UCTD
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APA (6th Edition):
Kotze, H. (2009). Investigation
into the effect of cooling conditions on the particle size
distribution of titania slag. (Doctoral Dissertation). University of Pretoria. Retrieved from http://hdl.handle.net/2263/26336
Chicago Manual of Style (16th Edition):
Kotze, Hanlie. “Investigation
into the effect of cooling conditions on the particle size
distribution of titania slag.” 2009. Doctoral Dissertation, University of Pretoria. Accessed April 10, 2021.
http://hdl.handle.net/2263/26336.
MLA Handbook (7th Edition):
Kotze, Hanlie. “Investigation
into the effect of cooling conditions on the particle size
distribution of titania slag.” 2009. Web. 10 Apr 2021.
Vancouver:
Kotze H. Investigation
into the effect of cooling conditions on the particle size
distribution of titania slag. [Internet] [Doctoral dissertation]. University of Pretoria; 2009. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2263/26336.
Council of Science Editors:
Kotze H. Investigation
into the effect of cooling conditions on the particle size
distribution of titania slag. [Doctoral Dissertation]. University of Pretoria; 2009. Available from: http://hdl.handle.net/2263/26336
Queensland University of Technology
10.
Nagle, Dylan John.
Infrared spectroscopic investigation of the effects of titania photocatalyst on the degradation of linear low density polyethylene film for commercial applications.
Degree: 2009, Queensland University of Technology
URL: https://eprints.qut.edu.au/32077/
► There is a need in industry for a commodity polyethylene film with controllable degradation properties that will degrade in an environmentally neutral way, for applications…
(more)
▼ There is a need in industry for a commodity polyethylene film with controllable degradation properties that will degrade in an environmentally neutral way, for applications such as shopping bags and packaging film. Additives such as starch have been shown to accelerate the degradation of plastic films, however control of degradation is required so that the film will retain its mechanical properties during storage and use, and then degrade when no longer required. By the addition of a photocatalyst it is hoped that polymer film will breakdown with exposure to sunlight. Furthermore, it is desired that the polymer film will degrade in the dark, after a short initial exposure to sunlight. Research has been undertaken into the photo- and thermo-oxidative degradation processes of 25 ìm thick LLDPE (linear low density polyethylene) film containing titania from different manufacturers. Films were aged in a suntest or in an oven at 50 °C, and the oxidation product formation was followed using IR spectroscopy. Degussa P25, Kronos 1002, and various organic-modified and doped titanias of the types Satchleben Hombitan and Hunstsman Tioxide incorporated into LLDPE films were assessed for photoactivity. Degussa P25 was found to be the most photoactive with UVA and UVC exposure. Surface modification of titania was found to reduce photoactivity. Crystal phase is thought to be among the most important factors when assessing the photoactivity of titania as a photocatalyst for degradation. Pre-irradiation with UVA or UVC for 24 hours of the film containing 3% Degussa P25 titania prior to aging in an oven resulted in embrittlement in ca. 200 days. The multivariate data analysis technique PCA (principal component analysis) was used as an exploratory tool to investigate the IR spectral data. Oxidation products formed in similar relative concentrations across all samples, confirming that titania was catalysing the oxidation of the LLDPE film without changing the oxidation pathway. PCA was also employed to compare rates of degradation in different films. PCA enabled the discovery of water vapour trapped inside cavities formed by oxidation by titania particles. Imaging ATR/FTIR spectroscopy with high lateral resolution was used in a novel experiment to examine the heterogeneous nature of oxidation of a model polymer compound caused by the presence of titania particles. A model polymer containing Degussa P25 titania was solvent cast onto the internal reflection element of the imaging ATR/FTIR and the oxidation under UVC was examined over time. Sensitisation of 5 ìm domains by titania resulted in areas of relatively high oxidation product concentration. The suitability of transmission IR with a synchrotron light source to the study of polymer film oxidation was assessed as the Australian Synchrotron in Melbourne, Australia. Challenges such as interference fringes and poor signal-to-noise ratio need to be addressed before this can become a routine technique.
Subjects/Keywords: titania photocatalyst; polyethylene film; Infrared spectroscopy
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APA ·
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APA (6th Edition):
Nagle, D. J. (2009). Infrared spectroscopic investigation of the effects of titania photocatalyst on the degradation of linear low density polyethylene film for commercial applications. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/32077/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nagle, Dylan John. “Infrared spectroscopic investigation of the effects of titania photocatalyst on the degradation of linear low density polyethylene film for commercial applications.” 2009. Thesis, Queensland University of Technology. Accessed April 10, 2021.
https://eprints.qut.edu.au/32077/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nagle, Dylan John. “Infrared spectroscopic investigation of the effects of titania photocatalyst on the degradation of linear low density polyethylene film for commercial applications.” 2009. Web. 10 Apr 2021.
Vancouver:
Nagle DJ. Infrared spectroscopic investigation of the effects of titania photocatalyst on the degradation of linear low density polyethylene film for commercial applications. [Internet] [Thesis]. Queensland University of Technology; 2009. [cited 2021 Apr 10].
Available from: https://eprints.qut.edu.au/32077/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nagle DJ. Infrared spectroscopic investigation of the effects of titania photocatalyst on the degradation of linear low density polyethylene film for commercial applications. [Thesis]. Queensland University of Technology; 2009. Available from: https://eprints.qut.edu.au/32077/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Australian National University
11.
Zhang, Meng Bi.
Stimuli-responsive nanomaterials for controlled delivery by light, magnetic and electrical triggers
.
Degree: 2017, Australian National University
URL: http://hdl.handle.net/1885/144613
► The use of nanomaterials for biomedical applications is an emerging and important field. This is particularly true of advancements in targeted and controlled drug delivery,…
(more)
▼ The use of nanomaterials for biomedical applications is an
emerging and important field. This is particularly true of
advancements in targeted and controlled drug delivery, which
offer several important improvements over traditional drug
administration. The clinical efficacy of small-molecule
therapeutics is currently limited by many factors, including:
poor solubility, inefficient cellular uptake, overly rapid renal
clearance and an inability to target only desired locations such
as diseased tissues. The use of nanocarriers for drug delivery
may greatly improve the efficacy over traditional therapeutics by
lowering the total dosage, limiting the exposure to affected
areas only, and giving greater temporal control over drug
elution. These materials often make use of both organic and
inorganic components, exploiting the unique and useful properties
of each constituent to achieve novel, synergistic functions.
This dissertation presents a study of nanocomposites comprising
the three most important materials in this field: titania, iron
oxides and polypyrrole. Titania is a strong photocatalyst, iron
oxides provide useful responses to applied magnetic fields, and
polypyrrole is a polymer with unique electrochemical properties.
Studies in this dissertation were aimed at combining these three
materials to create a novel structure that is responsive towards
light, magnetic fields and electrical stimulation to serve as an
enabling platform for the loading and release of biologically
interesting compounds.
These nanomaterials have been paired with amino acids L-lysine
and L-glutamic acid, two organic molecules of interest due to
their ability to bind to DNA and proteins, and to form prodrugs
that exhibit enhanced performance compared to traditionally
administered medicines. Two model compounds have been loaded and
released on these carriers: Ketoprofen, an important
anti-inflammatory that is traditionally hindered by its limited
cellular uptake levels; and fluorescein isothiocyanate, a
fluorescent dye molecule that is a common tool used in this field
for nanocarrier location and easy visualisation of
release-related kinetics.
First, an investigation into the effect of pH on the binding of
amino acids to titania, iron oxide and polypyrrole is presented
with a view towards optimising the functionalised material for
subsequent loading and release of the model drugs (in this case,
amine-reactive molecules). The release mechanism of
photo-activated TiO2 is studied in detail with a particular focus
on the competition between the cleavage of bonds versus organic
degradation on the catalyst’s surface. Both mechanisms are
currently reported in literature and studies were aimed at
identifying the more dominant pathway in the system developed
alongside understanding the crucial role of…
Subjects/Keywords: nanoparticles;
titania;
magnetic;
amino acids;
polypyrrole
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, M. B. (2017). Stimuli-responsive nanomaterials for controlled delivery by light, magnetic and electrical triggers
. (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/144613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhang, Meng Bi. “Stimuli-responsive nanomaterials for controlled delivery by light, magnetic and electrical triggers
.” 2017. Thesis, Australian National University. Accessed April 10, 2021.
http://hdl.handle.net/1885/144613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Meng Bi. “Stimuli-responsive nanomaterials for controlled delivery by light, magnetic and electrical triggers
.” 2017. Web. 10 Apr 2021.
Vancouver:
Zhang MB. Stimuli-responsive nanomaterials for controlled delivery by light, magnetic and electrical triggers
. [Internet] [Thesis]. Australian National University; 2017. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1885/144613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang MB. Stimuli-responsive nanomaterials for controlled delivery by light, magnetic and electrical triggers
. [Thesis]. Australian National University; 2017. Available from: http://hdl.handle.net/1885/144613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
12.
Maza, Esther Donado Sainz de la.
Cobalt supported on mesoporous silicas for the Fischer-Tropsch synthesis.
Degree: Chemical Science and Engineering (CHE), 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158473
► This thesis deals with the study of several catalysts for the Fischer-Tropsch synthesis in the Biomass-To-Liquid process. In this work two groups of catalysts…
(more)
▼ This thesis deals with the study of several catalysts for the Fischer-Tropsch synthesis in the Biomass-To-Liquid process. In this work two groups of catalysts were tested. On the one hand, two series of catalysts with cobalt loadings of 6 and 12 wt% over SiO2 and some of them containing 5wt% of TiO2 were tested. One the other hand, other two series of mesoporous short channel SBA-15, all of them with cobalt loadings of 12wt% and some with 5wt% of titania. The first series was supported on SBA-15 DeWitte and the second one on SBA-15 Martinez. On the one hand, the influence of water addition to the feed, titania content and cobalt loading to the catalyst and was studied, as well as the consequences of a GHSV. The FT reaction was carried out along 5 periods of 24 hours each, in which conditions such as feed and water content were modified, enabling the study of these parameters. It was found that water provokes an increase of the CO conversion and has a positive kinetic effect on the rate to hydrocarbons. However, this fact reaction is followed by a quick deactivation, enhanced by high water partial pressures. Most of that deactivation is irreversible since it is not completely recovered after water removal. On the other hand, differences between the supports were studied. Some SBA-15 supported catalysts show CO diffusion limitations at longer channel lengths than what applies for conventional 3D porous supports. Titania grafting increases the rate to hydrocarbons, showing positive results for FT catalysts development.
Subjects/Keywords: Fischer-Tropsch; cobalt; titania; SBA-15; water
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APA (6th Edition):
Maza, E. D. S. d. l. (2012). Cobalt supported on mesoporous silicas for the Fischer-Tropsch synthesis. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158473
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Maza, Esther Donado Sainz de la. “Cobalt supported on mesoporous silicas for the Fischer-Tropsch synthesis.” 2012. Thesis, KTH. Accessed April 10, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158473.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Maza, Esther Donado Sainz de la. “Cobalt supported on mesoporous silicas for the Fischer-Tropsch synthesis.” 2012. Web. 10 Apr 2021.
Vancouver:
Maza EDSdl. Cobalt supported on mesoporous silicas for the Fischer-Tropsch synthesis. [Internet] [Thesis]. KTH; 2012. [cited 2021 Apr 10].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158473.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Maza EDSdl. Cobalt supported on mesoporous silicas for the Fischer-Tropsch synthesis. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158473
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
13.
Barrientos, Javier.
Deaktivering av metanisering katalysatorer.
Degree: Chemical Science and Engineering (CHE), 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156183
► A titania-supported nickel catalyst was prepared and tested in methanation in order to evaluate its catalytic properties (activity, selectivity and specially, activity loss), and…
(more)
▼ A titania-supported nickel catalyst was prepared and tested in methanation in order to evaluate its catalytic properties (activity, selectivity and specially, activity loss), and compare it with an alumina-supported nickel catalyst. The titania-supported catalyst did not only show higher stability than alumina, but also presented a different cause of deactivation, carbon formation. In addition, a kinetic model was obtained for the titania-supported catalyst, and a study of the effect of different operating conditions (temperature, composition and partial pressures of synthesis gas and water) on the deactivation rate and carbon formation of this catalyst was performed.
Subjects/Keywords: methanation; carbon formation; deactivation; titania; nickel
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APA (6th Edition):
Barrientos, J. (2012). Deaktivering av metanisering katalysatorer. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156183
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Barrientos, Javier. “Deaktivering av metanisering katalysatorer.” 2012. Thesis, KTH. Accessed April 10, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156183.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Barrientos, Javier. “Deaktivering av metanisering katalysatorer.” 2012. Web. 10 Apr 2021.
Vancouver:
Barrientos J. Deaktivering av metanisering katalysatorer. [Internet] [Thesis]. KTH; 2012. [cited 2021 Apr 10].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156183.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Barrientos J. Deaktivering av metanisering katalysatorer. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156183
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Michigan Technological University
14.
Baker, Erin A.
Enhancing Osseointegration of Orthopaedic Implants with Titania Nanotube Surfaces.
Degree: PhD, Department of Mechanical Engineering-Engineering Mechanics, 2016, Michigan Technological University
URL: https://digitalcommons.mtu.edu/etdr/255
► Introduction: As joint arthroplasty surgical procedures increase annually, the development of new strategies, including novel materials and surface modifications, to attain solid bone-implant fixation…
(more)
▼ Introduction: As joint arthroplasty surgical procedures increase annually, the development of new strategies, including novel materials and surface modifications, to attain solid bone-implant fixation are needed to increase implant terms of service. In this study, we evaluate two morphologies of
titania nanotubes in both
in vitro and
in vivo experiments to quantify osseointegrative potential and material-level biocompatibility.
Materials and Methods: Samples were prepared via an electrochemical etching process. Two different
titania nanotube (TiNT) morphologies were produced, Aligned and Trabecular. For the
in vitro experiment, Sprague Dawley (SD) rat marrow-derived bone marrow cells (BMC) were seeded on samples. Alkaline phosphatase (ALP) activity, osteocalcin (OC) expression, expression of relevant genes as well as cell attachment and morphology were assessed. In the first
in vivo experiment, Kirschner wires were implanted unilaterally into SD rat femora with a TiNT-etched or unmodified (Control) implant. General health assessments and weekly body weights were recorded. At a 12-week endpoint, hematologic, systemic metal ion, and histologic analyses were performed. For the second
in vivo experiment, Kirschner wires were implanted bilaterally into SD rat femora, with a TiNT-etched implant in one femora and unmodified (Control) implant as an internal control. At 4- and 12-week endpoints, femora were assessed via biomechanics, undecalcified histology, micro-computed tomography (μCT), and backscattered electron imaging (BEI) to characterize
de novo bone formation.
Results:
In vitro experiments demonstrated BMC attachment and differentiation into osteoblasts as well as greater ALP activity, OC expression, total cell counts, and gene expression (of Col1a1, IGF-1, and osteonectin) on TiNT surfaces versus Controls. Cells on TiNT-etched substrates were smaller in diameter and more eccentric than Controls. In the first
in vivo experiment, there were significant differences in body weight between groups at Weeks 9 and 11. There were no significant differences in red or white blood cell function between TiNT groups and Control. Aluminum levels in the lungs were significantly greater in the Trabecular TiNT group compared to Control. Histologic analysis showed significantly fewer granulocytes and neutrophils in the distal region of Trabecular TiNT-implanted femora as well as significantly fewer foreign body giant/multinucleated cells and neutrophils in the midshaft region of Aligned TiNT-implanted femora versus Controls. In the second
in vivo experiment, at 12 weeks, µCT analysis showed TiNT implants generated greater bone formation than Controls. Histologic analysis demonstrated 1.5 times greater bone-implant contact in TiNT groups than Controls at 12 weeks. TiNT groups exhibited 1.3 to 3.7 times greater strength of fixation than Controls during pull-out testing. …
Advisors/Committee Members: Craig Friedrich.
Subjects/Keywords: Titania nanotubes; Osseointegration; Orthopaedic; Bone Formation; Biomaterials
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APA (6th Edition):
Baker, E. A. (2016). Enhancing Osseointegration of Orthopaedic Implants with Titania Nanotube Surfaces. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/255
Chicago Manual of Style (16th Edition):
Baker, Erin A. “Enhancing Osseointegration of Orthopaedic Implants with Titania Nanotube Surfaces.” 2016. Doctoral Dissertation, Michigan Technological University. Accessed April 10, 2021.
https://digitalcommons.mtu.edu/etdr/255.
MLA Handbook (7th Edition):
Baker, Erin A. “Enhancing Osseointegration of Orthopaedic Implants with Titania Nanotube Surfaces.” 2016. Web. 10 Apr 2021.
Vancouver:
Baker EA. Enhancing Osseointegration of Orthopaedic Implants with Titania Nanotube Surfaces. [Internet] [Doctoral dissertation]. Michigan Technological University; 2016. [cited 2021 Apr 10].
Available from: https://digitalcommons.mtu.edu/etdr/255.
Council of Science Editors:
Baker EA. Enhancing Osseointegration of Orthopaedic Implants with Titania Nanotube Surfaces. [Doctoral Dissertation]. Michigan Technological University; 2016. Available from: https://digitalcommons.mtu.edu/etdr/255
University of Cambridge
15.
Sharif, Nashid.
Design of titania photocatalytic membranes containing fine ceramic fibres.
Degree: PhD, 2018, University of Cambridge
URL: https://doi.org/10.17863/CAM.26469
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753442
► Photocatalytic membranes have been designed using two types of fine-scale alumina fibres, namely Nano Alumina Fibre (NAF) from Metallurg Engineering, Estonia and commercially available Saffil®…
(more)
▼ Photocatalytic membranes have been designed using two types of fine-scale alumina fibres, namely Nano Alumina Fibre (NAF) from Metallurg Engineering, Estonia and commercially available Saffil® Alumina Fibre (SAF) produced by Saffil Limited, UK. NAF fibres have an average diameter of about 15 nm and SAF about 4 μm. Membranes were produced in various ways. The fibre network architecture within the membranes, along with their porosity, specific surface area and mechanical properties, have been examined. These NAF-SAF membranes were impregnated with titania-based sol-gel coatings, to produce photocatalytic membranes. Their mechanical properties, specific surface area and flow properties were assessed and photocatalytic potential was measured by studying rates of degradation of aqueous dye solution. Membranes with photo-active top layers were designed by sedimentation of a fibrous layer of NAF-SAF, containing titania nanoparticles on a pre-sedimented support layer. Two types of photocatalyst were used, one a commercially available anatase nanopowder and the other silver-coated anatase. The latter was produced via modification of the first. Optimisation of the nanoparticle loadings was performed via assessing their photocatalytic efficiency. Specific permeability values were obtained experimentally and by prediction from the pore architecture. A novel form of photo-active membrane was designed by direct casting of milled SAF and titania-based sol-gel into circular moulds. Effects of fibre milling time and fibre to sol-gel ratio on their performance were studied, besides mechanical properties, porosity and specific surface area. Their flow properties and photocatalytic efficiency were also examined. Due to the availability of these fibres, especially the high production rates (kg/h range) and low cost of NAF, these membranes offer potential for large scale application.
Subjects/Keywords: 666; Titania; Photocatalytic; Membrane; Ceramic; Fibre
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APA (6th Edition):
Sharif, N. (2018). Design of titania photocatalytic membranes containing fine ceramic fibres. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.26469 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753442
Chicago Manual of Style (16th Edition):
Sharif, Nashid. “Design of titania photocatalytic membranes containing fine ceramic fibres.” 2018. Doctoral Dissertation, University of Cambridge. Accessed April 10, 2021.
https://doi.org/10.17863/CAM.26469 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753442.
MLA Handbook (7th Edition):
Sharif, Nashid. “Design of titania photocatalytic membranes containing fine ceramic fibres.” 2018. Web. 10 Apr 2021.
Vancouver:
Sharif N. Design of titania photocatalytic membranes containing fine ceramic fibres. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Apr 10].
Available from: https://doi.org/10.17863/CAM.26469 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753442.
Council of Science Editors:
Sharif N. Design of titania photocatalytic membranes containing fine ceramic fibres. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.26469 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753442
University of New South Wales
16.
Cao, Trung Tin.
Evaluation of doped-titania photocatalysts for aqueous glycerol degradation and hydrogen production under visible light illumination.
Degree: Chemical Sciences & Engineering, 2013, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/53277
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11972/SOURCE02?view=true
► This study describes a new method for enhancing photocatalytic activity of TiO2 under visible light with wetness impregnation method. Higher doping of Cobalt compared to…
(more)
▼ This study describes a new method for enhancing photocatalytic activity of TiO2 under visible light with wetness impregnation method. Higher doping of Cobalt compared to Platinum in support
Titania contributed to reducing commercial problem in catalyst preparation. A number of methods were utilized for characterizing catalysts such as: Brunauer, Emmett and Teller (BET), X-ray Diffraction (XRD), Thermal Gravity calcination (TGC), UV-Vis, UV-Fluorescence. From the result, the Co/TiO2 and Pt/TiO2 properties were improved for them to be more active in visible irradiation and performed high efficiency in photocatalytic activity. However, in wetness impregnation method, the conductivity level of Cobalt is lower than Platinum so Cobalt doped TiO2 was not suitable in hydrogen production area even though the percentage of Pt loading is minor compared to Cobalt.In addition, in 1.25 bubble column reactor was modified to appropriately work in this study. All of gas gauss meters were changed to mass flow control for precious measurement. In this reactor, two experiments which are glycerol degradation and glycerol to hydrogen under visible light were implemented. On the one hand, the Co/TiO2 was utilized for testing glycerol degradation. With the 8% of cobalt loading and pre-calcination at 773K, the catalyst exhibited a high productivity in photodegradation of glycerol. On the other hand, Pt/TiO2 conducted investigation of hydrogen generation. 0.2%wt Pt doped
Titania which was calcinated at 773K in basic environment, presented a significant yield in generating hydrogen. In addition, there are some essential component in bubble column reactor were evaluated for optimizing the hydrogen productivity in this reactor. As a result, the pH environment, catalyst loading and total flow rate are the key factors which directly affect the hydrogen generation. The reaction which was implemented at pH 11, 1g.L-1 of catalyst loading and 1200 mil.min-1 of total flow rate is the optimum condition of hydrogen production when utilizing Pt/TiO2 in this reactor.
Advisors/Committee Members: Adesoji, Adesina, Chemical Sciences & Engineering, Faculty of Engineering, UNSW, Frank, Lucien, Chemical Sciences & Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Hydrogen production; Titania; Waste water Treatment
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APA (6th Edition):
Cao, T. T. (2013). Evaluation of doped-titania photocatalysts for aqueous glycerol degradation and hydrogen production under visible light illumination. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53277 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11972/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Cao, Trung Tin. “Evaluation of doped-titania photocatalysts for aqueous glycerol degradation and hydrogen production under visible light illumination.” 2013. Masters Thesis, University of New South Wales. Accessed April 10, 2021.
http://handle.unsw.edu.au/1959.4/53277 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11972/SOURCE02?view=true.
MLA Handbook (7th Edition):
Cao, Trung Tin. “Evaluation of doped-titania photocatalysts for aqueous glycerol degradation and hydrogen production under visible light illumination.” 2013. Web. 10 Apr 2021.
Vancouver:
Cao TT. Evaluation of doped-titania photocatalysts for aqueous glycerol degradation and hydrogen production under visible light illumination. [Internet] [Masters thesis]. University of New South Wales; 2013. [cited 2021 Apr 10].
Available from: http://handle.unsw.edu.au/1959.4/53277 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11972/SOURCE02?view=true.
Council of Science Editors:
Cao TT. Evaluation of doped-titania photocatalysts for aqueous glycerol degradation and hydrogen production under visible light illumination. [Masters Thesis]. University of New South Wales; 2013. Available from: http://handle.unsw.edu.au/1959.4/53277 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11972/SOURCE02?view=true
University of New South Wales
17.
Wang, Jieyu.
Fabrication of Sn-doped Titania Hollow Spheres.
Degree: Materials Science & Engineering, 2016, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/57367
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43331/SOURCE02?view=true
Subjects/Keywords: Titania Hollow Spheres
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APA ·
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MLA ·
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APA (6th Edition):
Wang, J. (2016). Fabrication of Sn-doped Titania Hollow Spheres. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57367 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43331/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Wang, Jieyu. “Fabrication of Sn-doped Titania Hollow Spheres.” 2016. Masters Thesis, University of New South Wales. Accessed April 10, 2021.
http://handle.unsw.edu.au/1959.4/57367 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43331/SOURCE02?view=true.
MLA Handbook (7th Edition):
Wang, Jieyu. “Fabrication of Sn-doped Titania Hollow Spheres.” 2016. Web. 10 Apr 2021.
Vancouver:
Wang J. Fabrication of Sn-doped Titania Hollow Spheres. [Internet] [Masters thesis]. University of New South Wales; 2016. [cited 2021 Apr 10].
Available from: http://handle.unsw.edu.au/1959.4/57367 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43331/SOURCE02?view=true.
Council of Science Editors:
Wang J. Fabrication of Sn-doped Titania Hollow Spheres. [Masters Thesis]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/57367 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43331/SOURCE02?view=true
18.
Sibu,C P.
Sol-Gel Nanocrystalline Catalytic Titania Powders and Functional Coatings.
Degree: 2004, Cochin University of Science and Technology
URL: http://dyuthi.cusat.ac.in/purl/93
► In the present work Titania bulk powders and coatings were prepared by subjecting titanium isopropoxide solution to a controlled hydrolysis-condensation process. The powders were characterized…
(more)
▼ In the present work Titania bulk powders and coatings were prepared by subjecting titanium isopropoxide solution to a controlled hydrolysis-condensation process. The powders were characterized using techniques such as FTIR for their chemical interactions, TG-DTA for the thermal decomposition features, XRD for the phase assemblage, BET specific surface area analysis for the textural features. The study discusses the preparation methods and the characterization techniques employed and a detailed discussion on the physico-chemical characterization of the prepared systems. The influence of dopants and leaching on the physico-chemical properties as well as their influence on photo activity is also included. The structural/functional coatings of different Titania compositions includes in this study. Coatings on pre-treated glass surfaces with the best compositions prepared showed 90 % transmittance in the visible region.
Subjects/Keywords: Sol-gel Titania; Titanium isopoxide; SOL-GEL nanocrystalline Titania; Titania powder
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APA (6th Edition):
P, S. (2004). Sol-Gel Nanocrystalline Catalytic Titania Powders and Functional Coatings. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/93
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
P, Sibu,C. “Sol-Gel Nanocrystalline Catalytic Titania Powders and Functional Coatings.” 2004. Thesis, Cochin University of Science and Technology. Accessed April 10, 2021.
http://dyuthi.cusat.ac.in/purl/93.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
P, Sibu,C. “Sol-Gel Nanocrystalline Catalytic Titania Powders and Functional Coatings.” 2004. Web. 10 Apr 2021.
Vancouver:
P S. Sol-Gel Nanocrystalline Catalytic Titania Powders and Functional Coatings. [Internet] [Thesis]. Cochin University of Science and Technology; 2004. [cited 2021 Apr 10].
Available from: http://dyuthi.cusat.ac.in/purl/93.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
P S. Sol-Gel Nanocrystalline Catalytic Titania Powders and Functional Coatings. [Thesis]. Cochin University of Science and Technology; 2004. Available from: http://dyuthi.cusat.ac.in/purl/93
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
19.
Murria, Priya.
Titania Nanotubes For Biotechnological Applications.
Degree: MS, Faculty of Science, 2014, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/2354
► Over the past few decades, inorganic nanostructured materials have elicited a lot of interest due to their high surface-to-volume ratio and many size dependent properties…
(more)
▼ Over the past few decades, inorganic nanostructured materials have elicited a lot of interest due to their high surface-to-volume ratio and many size dependent properties which stem from their nanoscale dimensions. Owing to these distinct properties, they have found applications in widespread fields like catalysis, energy storage, electronics, and biotechnology.
In the field of biotechnology, nanotubes and mesoporous materials are attractive vehicles for drug delivery because of their hollow and porous structures and facile surface functionalization. Their inner void can take up large amounts of drug as well as act as gates for the controlled release of drug. These hollow structures can also be used for confining biomolecules like proteins and peptides. The study on protein conformation in biocompatible materials is very important in materials sciences for the development of new and efficient biomaterials(sensors, drug delivery systems or planted devices).
Titania(TiO2)has been widely explored for applications in photovoltaic cells, batteries, desalination, sensing, and photocatalysis, to name only a few. The work presented in this thesis focuses on
titania based nanostructures for drug delivery and protein confinement.
First part of the work focusses on synthesis and characterization of Fe-doped TiO2 nanotubes. Fe-doped TiO2 nanotubes were demonstrated as controlled drug delivery agents. In vitro cytotoxic effects of Fe-doped
titania nanotubes were assessed by MTT assay by exposing Hela cell line to the nanotubes.
Second part of the work focusses on synthesis and characterization of TiO2 nanotubes by two synthesis procedures, namely hydrothermal and sol-gel template synthesis. Myoglobin, a model globin protein was encapsulated in hydrothermally synthesized TiO 2 nanotubes(diameter 5 nm) and sol-gel template synthesized TiO2 nanotubes(diameter 200 nm). Effect of encapsulating myoglobin these nanotubes was studied. The electrochemical activity and structure of myoglobin were studied by cyclic voltammetry and circular dichroism respectively. Direct electron transfer was found to be enhanced upon confinement in 200 nm diameter nanotubes. No such enhancement was observed upon encapsulation in hydrothermally synthesized nanotubes. In addition to this, the thermal stability of myoglobin was found to be enhanced upon confinement inside 200 nm diameter TiO 2 nanotubes.
Advisors/Committee Members: Bhattacharyya, Aninda J (advisor).
Subjects/Keywords: Titanium Nanotubes; Bionanotechnology; Biomedical Engineering; Myoglobin Encapsulation; Titania Nanotubes - Biomedical Applications; Fe-Doped Titania Nanotubes; Fe-doped TiO2 Nanotubes; Drug Delivery; Titania Nanotube (TNT); Nanostructured Materials; TiO2 Nanoparticles; Nanotechnology
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APA (6th Edition):
Murria, P. (2014). Titania Nanotubes For Biotechnological Applications. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2354
Chicago Manual of Style (16th Edition):
Murria, Priya. “Titania Nanotubes For Biotechnological Applications.” 2014. Masters Thesis, Indian Institute of Science. Accessed April 10, 2021.
http://etd.iisc.ac.in/handle/2005/2354.
MLA Handbook (7th Edition):
Murria, Priya. “Titania Nanotubes For Biotechnological Applications.” 2014. Web. 10 Apr 2021.
Vancouver:
Murria P. Titania Nanotubes For Biotechnological Applications. [Internet] [Masters thesis]. Indian Institute of Science; 2014. [cited 2021 Apr 10].
Available from: http://etd.iisc.ac.in/handle/2005/2354.
Council of Science Editors:
Murria P. Titania Nanotubes For Biotechnological Applications. [Masters Thesis]. Indian Institute of Science; 2014. Available from: http://etd.iisc.ac.in/handle/2005/2354
Pontifical Catholic University of Rio de Janeiro
20.
LAIS HELENA MOREIRA DA COSTA.
[en] JANUS NANOPARTICLES FORMED BY GOLD AND TITANIUM DIOXIDE
AS PHOTOCATALYST FOR HYDROGEN PRODUCTION FROM WATER.
Degree: 2019, Pontifical Catholic University of Rio de Janeiro
URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36253
► [pt] Partículas que apresentam dois lados com propriedades químicas distintas são chamadas de Janus, como uma referência ao deus de duas faces da mitologia Romana.…
(more)
▼ [pt] Partículas que apresentam dois lados com
propriedades químicas distintas são chamadas de Janus, como uma
referência ao deus de duas faces da mitologia Romana. A combinação
de propriedades diferentes em um mesmo sistema vem se demonstrando
interessante para inúmeras aplicações. Neste trabalho,
nanopartículas de ouro anfifílicas foram sintetizadas através do
recobrimento seletivo dos hemisférios do núcleo metálico, por dois
polímeros, sendo um hidrofóbico e outro hidrofílico. Em seguida,
foi realizado o crescimento preferencial de dióxido de titânio
apenas na face com recobrimento hidrofílico. Os resultados obtidos
pela caracterização estrutural e físico-química confirmaram a
formação de nanopartículas de ouro com um hemisfério recoberto por
dióxido de titânio de baixa cristalinidade e alta porosidade,
provando seu caráter Janus. As nanopartículas Janus obtidas foram
testadas como fotocatalisadores para produção de gás hidrogênio a
partir da água. Os resultados mostraram sua atividade superior em
relação a nanopartículas formadas apenas por titânia. Portanto,
este estudo descreve uma nova estratégia para obtenção de
nanopartículas Janus, que podem ser utilizadas para diferentes
aplicações, e ainda demonstra sua importância nas áreas de catálise
e de produção de gás hidrogênio como combustível
renovável.
[en] Particles possessing two sides with different
chemical properties are named Janus, as a reference to the
double-faced god of Roman mythology. The combination of two
different properties in the same system has been showing
interesting for numerous applications. In this work, amphiphilic
gold nanoparticles were synthesized by selectively coating the
metallic nucleus hemispheres with two polymers, one hydrophobic and
one hydrophilic. Then, a preferential growth of titanium dioxide
over the hydrophilic face was performed. The results obtained by
structural and physicochemical characterization confirmed the
formation of gold nanoparticles with one hemisphere coated by
titanium dioxide with low crystallinity and high porosity, proving
the Janus character. The obtained Janus nanoparticles were tested
as photocatalysts for hydrogen production from water. Results
showed the superior activity in comparison to nanoparticles
comprised only by titania. Thus, this study describes a new
strategy to obtain Janus nanoparticles, which can be used for
different applications and also demonstrates their importance in
the fields of catalysis and production of hydrogen gas as renewable
fuel.
Advisors/Committee Members: ANA MARIA PERCEBOM SETTE DA SILVA.
Subjects/Keywords: [pt] NANOTECNOLOGIA; [en] NANOTECHNOLOGY; [pt] TITANIA; [en] TITANIA; [pt] CATALISE; [en] CATALYSIS; [pt] PRODUCAO DE HIDROGENIO; [en] HYDROGEN PRODUCTION
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APA (6th Edition):
COSTA, L. H. M. D. (2019). [en] JANUS NANOPARTICLES FORMED BY GOLD AND TITANIUM DIOXIDE
AS PHOTOCATALYST FOR HYDROGEN PRODUCTION FROM WATER. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36253
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
COSTA, LAIS HELENA MOREIRA DA. “[en] JANUS NANOPARTICLES FORMED BY GOLD AND TITANIUM DIOXIDE
AS PHOTOCATALYST FOR HYDROGEN PRODUCTION FROM WATER.” 2019. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed April 10, 2021.
http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36253.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
COSTA, LAIS HELENA MOREIRA DA. “[en] JANUS NANOPARTICLES FORMED BY GOLD AND TITANIUM DIOXIDE
AS PHOTOCATALYST FOR HYDROGEN PRODUCTION FROM WATER.” 2019. Web. 10 Apr 2021.
Vancouver:
COSTA LHMD. [en] JANUS NANOPARTICLES FORMED BY GOLD AND TITANIUM DIOXIDE
AS PHOTOCATALYST FOR HYDROGEN PRODUCTION FROM WATER. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. [cited 2021 Apr 10].
Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36253.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
COSTA LHMD. [en] JANUS NANOPARTICLES FORMED BY GOLD AND TITANIUM DIOXIDE
AS PHOTOCATALYST FOR HYDROGEN PRODUCTION FROM WATER. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36253
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
ANTOLíN POZUETA, Ana María.
Élimination du nitrate dans l'eau potable par catalyse hétérogène et photocatalyse au moyen de nanocatalyseurs AgPt et PdSn supportés sur oxyde de titane : Heterogeneous catalytic and photocatalytic nitrate abatement for drinking water using AgPt and PdSn supported on titania nanocatalysts.
Degree: Docteur es, Chimie et Physicochimie des matériaux, 2016, Montpellier, Ecole nationale supérieure de chimie; Universitat Rovira i Virgili (Tarragone, Espagne)
URL: http://www.theses.fr/2016ENCM0016
► En Europe, l’utilisation en agriculture de grandes quantités d’engrais chimiques est la principale cause de contamination des eaux. Les concentrations en nitrate dans l’eau deviennent…
(more)
▼ En Europe, l’utilisation en agriculture de grandes quantités d’engrais chimiques est la principale cause de contamination des eaux. Les concentrations en nitrate dans l’eau deviennent nuisibles pour les personnes lorsqu’elles dépassent certaines limites car elles sont la cause de méthémoglobinémie, de cancers et agissent comme perturbateurs endocriniens. L’hydrogénation catalytique hétérogène des nitrates est la méthode de dénitration la plus connue et la plus efficace due à la grande sélectivité pour les produits non toxiques, azote et eau. La photocatalyse hétérogène a émergé comme une voie très prometteuse de dénitration du fait de la possibilité d’utiliser la lumière solaire ce qui la rend commercialement compétitive et compatible avec la protection de l’environnement. Les procédés catalytiques conduisent fréquemment à l’obtention des sous-produits toxiques nitrite et ion ammonium, ainsi qu’à des oxydes d’azote gazeux NOx. Dans ce travail ont été utilisés des catalyseurs monométalliques supportés (Ag/P25, Pt/P25), leur mélange physique, et des catalyseurs bimétalliques supportés (Ag-Pt/P25 et Pd-Sn/P25). Le support oxyde de titane (TiO2) P25 est choisi pour développer un catalyseur performant pour la dénitration à la fois catalytique et photocatalytique permettant d’atteindre les normes requises par l’UE dans l’eau potable (50 mg/L NO3-, 0.5 mg/L NO2-, 0.3 mg/L NH4+). L’influence des teneurs en métaux (Ag: 0.5 – 4 pds.%; Pt: 2 et 4 pds.%), du précurseur Pt (H2PtCl6 (H)/K2PtCl6 (K)), de l’ordre d’imprégnation de Ag et Pt et de la morphologie des particules bimétalliques Pd-Sn (nanoparticules et nanobâtonnets) ont été étudiés. Les conditions expérimentales (présence/absence de H2 ; λ = 254 ou 365 nm; 4W; 45.4 mW/cm2) ont été également variées et les réactions effectuées dans un réacteur batch en PTFE sous atmosphère inerte et dans des conditions standard (catalyseur : 0.7 mg/L ; 100 mg/L NO3- ; 500 r.p.m). Contrairement à la plupart des études précédentes aucun «piégeur de trous» (expl. acides formique ou oxalique) n’a été utilisé dans nos conditions de réaction, Les analyses ont été effectuées par chromatographie ionique ou photométrie. Les propriétés physico-chimiques des catalyseurs ont été déterminées par DRX, Physisorption de N2, MET, DRUV-Vis, XPS, TPR et chimisorption de H2. Le support TiO2 P25 est inactif dans les deux procèdés non photocatalytique et photocatalyique. Le mélange physique Ag/P25+Pt/P25 conduit à une conversion (~ 56%) et sélectivité en N2 (~ 76%) plus élevées dans les conditions non photocatalytiques que chacun des homologues monométalliques, cependant NO2- and NH4+ sont obtenus. Les catalyseurs bimétalliques Ag-Pt(Pt-Ag)/P25 se montrent polyvalents étant actifs dans les procédés non-photocatalytiques et photocatalytiques. Les meilleurs résultats photocatalytiques ont été obtenus sous irradiation ultraviolette de 365 nm et en présence de H2 dû à la synergie entre les électrons générés par irradiation et l’hydrogène dissocié sut Pt. Le Pt imprégné en premier conduit à une conversion plus…
Advisors/Committee Members: Tichit, Didier (thesis director), Medina, Francisco (thesis director).
Subjects/Keywords: Dénitration; Catalyse/Photocatalyse; Titania; Ag-Pt; Pd-Sn; Eau potable; Denitration; Catalysis/Photocatalysis; Titania; Ag-Pt; Pd-Sn; Drinking water; 540
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APA ·
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APA (6th Edition):
ANTOLíN POZUETA, A. M. (2016). Élimination du nitrate dans l'eau potable par catalyse hétérogène et photocatalyse au moyen de nanocatalyseurs AgPt et PdSn supportés sur oxyde de titane : Heterogeneous catalytic and photocatalytic nitrate abatement for drinking water using AgPt and PdSn supported on titania nanocatalysts. (Doctoral Dissertation). Montpellier, Ecole nationale supérieure de chimie; Universitat Rovira i Virgili (Tarragone, Espagne). Retrieved from http://www.theses.fr/2016ENCM0016
Chicago Manual of Style (16th Edition):
ANTOLíN POZUETA, Ana María. “Élimination du nitrate dans l'eau potable par catalyse hétérogène et photocatalyse au moyen de nanocatalyseurs AgPt et PdSn supportés sur oxyde de titane : Heterogeneous catalytic and photocatalytic nitrate abatement for drinking water using AgPt and PdSn supported on titania nanocatalysts.” 2016. Doctoral Dissertation, Montpellier, Ecole nationale supérieure de chimie; Universitat Rovira i Virgili (Tarragone, Espagne). Accessed April 10, 2021.
http://www.theses.fr/2016ENCM0016.
MLA Handbook (7th Edition):
ANTOLíN POZUETA, Ana María. “Élimination du nitrate dans l'eau potable par catalyse hétérogène et photocatalyse au moyen de nanocatalyseurs AgPt et PdSn supportés sur oxyde de titane : Heterogeneous catalytic and photocatalytic nitrate abatement for drinking water using AgPt and PdSn supported on titania nanocatalysts.” 2016. Web. 10 Apr 2021.
Vancouver:
ANTOLíN POZUETA AM. Élimination du nitrate dans l'eau potable par catalyse hétérogène et photocatalyse au moyen de nanocatalyseurs AgPt et PdSn supportés sur oxyde de titane : Heterogeneous catalytic and photocatalytic nitrate abatement for drinking water using AgPt and PdSn supported on titania nanocatalysts. [Internet] [Doctoral dissertation]. Montpellier, Ecole nationale supérieure de chimie; Universitat Rovira i Virgili (Tarragone, Espagne); 2016. [cited 2021 Apr 10].
Available from: http://www.theses.fr/2016ENCM0016.
Council of Science Editors:
ANTOLíN POZUETA AM. Élimination du nitrate dans l'eau potable par catalyse hétérogène et photocatalyse au moyen de nanocatalyseurs AgPt et PdSn supportés sur oxyde de titane : Heterogeneous catalytic and photocatalytic nitrate abatement for drinking water using AgPt and PdSn supported on titania nanocatalysts. [Doctoral Dissertation]. Montpellier, Ecole nationale supérieure de chimie; Universitat Rovira i Virgili (Tarragone, Espagne); 2016. Available from: http://www.theses.fr/2016ENCM0016
NSYSU
22.
Wu, Yu-jiuan.
Feasibility study of photocatalysis on the volatile organic compounds using TiO2 coated activated carbon fiber.
Degree: Master, Environmental Engineering, 2005, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906105-173043
► This study combined photocatalytic technology with activated carbon adsorption to decompose gaseous pollutants. Gaseous pollutants were initially adsorbed and concentrated by activated carbon and could…
(more)
▼ This study combined photocatalytic technology with activated carbon adsorption to decompose gaseous pollutants. Gaseous pollutants were initially adsorbed and concentrated by activated carbon and could be further decomposed more effectively by photocatalytic technology.
This study coated TiO2 on the activated carbon fiber (ACF) by a sol-gel process for conducting the adsorption and decomposition of acetone in a batch reactor. Operating parameters investigated in this study included the initial concentration of acetone (13.6 μM and 27.2 μM), reaction temperature (50â~70â), oxygen concentration (0.5%~20%), and water vapor (0 μM~244.9 μM). The incident UV light of 365 nm was irradiated by a 15-watt low-pressure mercury lamp placing above the photocatalytic batch reactor. The ACF coated with TiO2 was placed in the center of the reactor. Acetone was injected into the reactor to conduct photocatalytic tests. Reactants and products were analyzed quantitatively by a gas chromatography with electron capture detector (GC/ECD) and a flame ionization detector followed by a methaneizer (GC/FID-Methaneizer).
Results from the photocatalysis tests indicated that, among the commercial TiO2 (Degussa P-25), NO3-/TiO2 and SO42-/TiO2, SO42-/TiO2 had the best photoactivity reduced acetone concentration and reaction time substantially. The end products was mainly CO2 and CO, which resulted in the mineralization ratio above 95%. Results from the operating parameter tests revealed that the increase of the initial acetone concentration enhanced the amount of acetone adsorbed on the ACF, which however did not increase the reaction rate of acetone. Although the increase of reaction temperature could reduce the amount of acetone adsorbed on the ACF, decomposition rate of acetone could be promoted, so as the yield rate and mineralization ratio of products (CO2 and CO). Increasing oxygen concentration did not influence the decomposition significantly except for oxygen concentration lower than 1%. The increase of water vapor would slightly decrease the amount of acetone adsorbed on the ACF, which did not decrease the decomposition of acetone anyway. This study revealed that the decomposition of acetone on TiO2/ACF can enhance the mass transfer of acetone substantially.
Advisors/Committee Members: Chung-Shiuan Hung (chair), Ming-Shean Chou (chair), Chung-Shin Yuan (committee member), Cheng-Di Dong (chair).
Subjects/Keywords: activated carbon fiber; acetone; titania
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APA (6th Edition):
Wu, Y. (2005). Feasibility study of photocatalysis on the volatile organic compounds using TiO2 coated activated carbon fiber. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906105-173043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wu, Yu-jiuan. “Feasibility study of photocatalysis on the volatile organic compounds using TiO2 coated activated carbon fiber.” 2005. Thesis, NSYSU. Accessed April 10, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906105-173043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Yu-jiuan. “Feasibility study of photocatalysis on the volatile organic compounds using TiO2 coated activated carbon fiber.” 2005. Web. 10 Apr 2021.
Vancouver:
Wu Y. Feasibility study of photocatalysis on the volatile organic compounds using TiO2 coated activated carbon fiber. [Internet] [Thesis]. NSYSU; 2005. [cited 2021 Apr 10].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906105-173043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu Y. Feasibility study of photocatalysis on the volatile organic compounds using TiO2 coated activated carbon fiber. [Thesis]. NSYSU; 2005. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906105-173043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universiteit Utrecht
23.
Castillo, S.I.R.
Cubic colloids : Synthesis, functionalization and applications.
Degree: 2015, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/311279
► This thesis is a study on cubic colloids: micron-sized cubic particles with rounded corners (cubic superballs). Owing to their shape, particle packing for cubes is…
(more)
▼ This thesis is a study on cubic colloids: micron-sized cubic particles with rounded corners (cubic superballs). Owing to their shape, particle packing for cubes is more efficient than for spheres and results in fascinating phase and packing behavior. For our cubes, the particle volume fraction when randomly packed is ~0.74, whereas it is only ~0.64 for spheres. Here, we show that cubic colloids are not only relevant for fundamental research, but also for potential applications in materials science, such as separation membranes and coatings. The research has two focus points: synthesis of cubic colloids cubes, and the functionalization and applications of cubes for materials science.
Cubic colloids can be prepared from different inorganic materials using iron oxide (hematite, α-Fe2O3) cubes as shape template. The size of the hematite cubes is tunable between 500 nm and 1500 nm.
We established synthesis procedures to coat the hematite templates with either silica (SiO2) or
titania (TiO2) to obtain core-shell cubes. Subsequent dissolution of the hematite core with acid results in hollow silica and
titania cubes.
Moreover, two methods to increase the porosity of the silica cubes have been developed: surface-protected silica etching and surfactant pore templating. With the first method, pores in a wide diameter range were created by enlargement of the micropores (pore diameter < 2 nm) intrinsically present in the silica coating, while preserving the cubic shape. In the second method, cylindrical micelles of cetyltrimethylammonium bromide (CTAB) molecules are incorporated into the silica coating. Removal of the micelles yields well-defined mesopores with an average diameter of 2.5 nm.
In view of cubic colloids as functional materials, we have investigated two methods to add functionality to hollow silica cubes.
As a first example, we used core-shell hematite/silica cubes and exploited the catalytic properties of the core. In the presence of hydrogen peroxide, the hematite core enhances the degradation of organic dyes (modified Fenton reaction), while the silica shell preserves the cubic shape. Further enhancement was achieved by illumination with visible or UV light. We demonstrated that enhanced degradation is neither hampered by the silica shell nor by densely packing the cubes on a substrate.
For our second example, we employed hollow mesoporous silica cubes. These hollow cubes are filled with silver, gold or polypyrrole by in situ synthesis. Reactants are inserted inside the cubes in separate steps. There they react and the resulting product remains confined in the cubes. In this way, aggregation of the functional substances is prevented.
Finally, we delivered proof-of-principle of Cubicle Membranes by employing cubic colloids as building blocks of inorganic separation membranes. To this end, we investigated the formation and liquid permeability of dense random cube packings. Our experiments with solid hematite cubes and hollow microporous silica cubes showed that liquid…
Advisors/Committee Members: Philipse, A.P., Thies-Weesie, D.M.E..
Subjects/Keywords: cubes; colloids; superballs; hematite; silica; titania; mesoporous; catalyst; liquid permeability
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APA (6th Edition):
Castillo, S. I. R. (2015). Cubic colloids : Synthesis, functionalization and applications. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/311279
Chicago Manual of Style (16th Edition):
Castillo, S I R. “Cubic colloids : Synthesis, functionalization and applications.” 2015. Doctoral Dissertation, Universiteit Utrecht. Accessed April 10, 2021.
http://dspace.library.uu.nl:8080/handle/1874/311279.
MLA Handbook (7th Edition):
Castillo, S I R. “Cubic colloids : Synthesis, functionalization and applications.” 2015. Web. 10 Apr 2021.
Vancouver:
Castillo SIR. Cubic colloids : Synthesis, functionalization and applications. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2015. [cited 2021 Apr 10].
Available from: http://dspace.library.uu.nl:8080/handle/1874/311279.
Council of Science Editors:
Castillo SIR. Cubic colloids : Synthesis, functionalization and applications. [Doctoral Dissertation]. Universiteit Utrecht; 2015. Available from: http://dspace.library.uu.nl:8080/handle/1874/311279
University of South Australia
24.
Hanly, Gary.
The wetting of a titania surface : surface charge and thin liquid films.
Degree: 2008, University of South Australia
URL: http://arrow.unisa.edu.au:8081/1959.8/47043
► The hydrophobicity of a titania surface was increased by adsorption of octadecyltrihydrosilane (OTHS). The modified titania surface was characterised using a number of techniques: tapping…
(more)
▼ The hydrophobicity of a titania surface was increased by adsorption of octadecyltrihydrosilane (OTHS). The modified titania surface was characterised using a number of techniques: tapping mode AFM, streaming potential, X-Ray photoelectron spectroscopy and contact angle measurements. With a partial surface coverage of OTHS, a bell-shaped dependence of contact angle with respect to pH was observed, with the maximum advancing contact angle occurring at the point of zero charge of the titanium dioxide substrate. The contact angle change was also influenced by the surface coverage and salt concentration. At extreme pH values there was no further decrease in the contact angle, i.e. saturation occurred. A thermodynamic model was used to describe the influence of surface charge on the contact angle. The results were interpreted as a reduction in the solid-liquid interfacial free energy. The model described the results well until the point where saturation occurred.
Subjects/Keywords: Surface chemistry; Wetting; Titania surface
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APA (6th Edition):
Hanly, G. (2008). The wetting of a titania surface : surface charge and thin liquid films. (Thesis). University of South Australia. Retrieved from http://arrow.unisa.edu.au:8081/1959.8/47043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hanly, Gary. “The wetting of a titania surface : surface charge and thin liquid films.” 2008. Thesis, University of South Australia. Accessed April 10, 2021.
http://arrow.unisa.edu.au:8081/1959.8/47043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hanly, Gary. “The wetting of a titania surface : surface charge and thin liquid films.” 2008. Web. 10 Apr 2021.
Vancouver:
Hanly G. The wetting of a titania surface : surface charge and thin liquid films. [Internet] [Thesis]. University of South Australia; 2008. [cited 2021 Apr 10].
Available from: http://arrow.unisa.edu.au:8081/1959.8/47043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hanly G. The wetting of a titania surface : surface charge and thin liquid films. [Thesis]. University of South Australia; 2008. Available from: http://arrow.unisa.edu.au:8081/1959.8/47043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Ahmed Yasir,Vakayil; Mohan Das,P N.
Investigations on Some Titania Supported Catalysts.
Degree: 2001, Cochin University of Science and Technology
URL: http://dyuthi.cusat.ac.in/purl/38
► Titania is a versatile metal oxide with multiple applications. Titania supported catalysts are reported to be much more active compared to conventional silica or alumina…
(more)
▼ Titania is a versatile metal oxide with multiple applications. Titania supported catalysts are reported to be much more active compared to conventional silica or alumina supported ones in some reactions. TiO2 (anatase) having high surface area, with better crystallinity and high onset temperature of rutilation can be prepared by thermal hydrolysis of titanyl sulfate solution under controlled conditions. Calcinations at 350 °C for 6 hrs were necessary to crystallize anatase. Method of preparation and percentage of the loaded metal oxides have greater influence on surface area. Drastic decrease in surface area was observed upon rutilation. Rutilation started at different temperatures depending on the metal oxide and the method of preparation. TiO2 should be characterized with high surface area, phase purity and high onset temperature of rutilation.Which should be well above the optimum temperature of a designated reaction in which it is employed as a catalyst. Variation in physical properties, depending upon the method of preparation is greater in TiO2 supported catalysts. Methanation activity was found to be highly dependent on nickel concentration present on the surface of the pellets. The methanation activity is strongly influenced by support material. The rate and turn over frequency of methanation and toluene oxidation activity of these catalysts are also equally important from an industrial point of view.
Subjects/Keywords: Titania; Crystallinity; Rutilation; Methanation activity
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APA (6th Edition):
N, A. Y. M. D. (2001). Investigations on Some Titania Supported Catalysts. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/38
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
N, Ahmed Yasir,Vakayil; Mohan Das,P. “Investigations on Some Titania Supported Catalysts.” 2001. Thesis, Cochin University of Science and Technology. Accessed April 10, 2021.
http://dyuthi.cusat.ac.in/purl/38.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
N, Ahmed Yasir,Vakayil; Mohan Das,P. “Investigations on Some Titania Supported Catalysts.” 2001. Web. 10 Apr 2021.
Vancouver:
N AYMD. Investigations on Some Titania Supported Catalysts. [Internet] [Thesis]. Cochin University of Science and Technology; 2001. [cited 2021 Apr 10].
Available from: http://dyuthi.cusat.ac.in/purl/38.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
N AYMD. Investigations on Some Titania Supported Catalysts. [Thesis]. Cochin University of Science and Technology; 2001. Available from: http://dyuthi.cusat.ac.in/purl/38
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Mississippi State University
26.
Daggolu, Prashant Reuben.
DEOXYGENATION CATALYSIS ON TITANIA FOR RENEWABLE FUEL APPLICATIONS.
Degree: PhD, Chemical Engineering, School of, 2011, Mississippi State University
URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11302010-121814/
;
► <p class=MsoNormal style='text-indent:.5in'>This research studies the use of <span class=SpellE><span class=GramE>
titania</span></span> (titanium dioxide, TiO
2) as a catalyst for <span class=SpellE>deoxygenation</span> of <span class=SpellE>syngas</span> derived oxygenates.…
(more)
▼ <p class=MsoNormal style='text-indent:.5in'>This research studies the use of <span
class=SpellE><span class=GramE>
titania</span></span> (titanium dioxide, TiO
2)
as a catalyst for <span class=SpellE>deoxygenation</span> of <span
class=SpellE>syngas</span> derived oxygenates. These oxygenates are formed as
byproducts when biomass derived <span class=SpellE>syngas</span> (CO & H
2)
is converted to ethanol on Rhodium or Molybdenum based catalysts. Conversion of
these oxygenates to hydrocarbon would enhance the viability of <span
class=SpellE>syngas</span> to gasoline technology. This study revealed that <span
class=SpellE><span class=GramE>
titania</span></span> can indeed be used to
convert <span class=SpellE>syngas</span> derived oxygenates to hydrocarbon at
high temperature and pressure. Acetone condensation to <span class=SpellE>mesitylene</span>
was studied very closely. The study revealed that the acid-base dual nature of <span
class=SpellE><span class=GramE>
titania</span></span> is key for the success of
this reaction. When <span class=SpellE><span class=GramE>
titania</span></span>
was combined with the <span class=SpellE>zeolite</span> H
+/ZSM-5, a
broad range of gasoline type hydrocarbon could be produced. Ethanol conversion
to higher alcohols was studied as part of a partial <span class=SpellE>deoxygenation</span>
of ethanol research. While this conversion was possible on <span class=SpellE><span
class=GramE>
titania</span></span>, <span class=SpellE>zirconia</span> proved to
be a better catalyst. Ethanol could be converted to 1-butanol and other higher
alcohols at high temperature and pressure. The mechanism by which this occurs
was studied as well.
Advisors/Committee Members: William Henry (committee member), Bill Elmore (committee member), Rafael Hernandez (committee member), Mark G White (chair).
Subjects/Keywords: fuel; Syngas; Catalysis; Hydrocarbon; Gasoline; Oxygenates; Titania; Deoxygenation; Biofuels
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APA (6th Edition):
Daggolu, P. R. (2011). DEOXYGENATION CATALYSIS ON TITANIA FOR RENEWABLE FUEL APPLICATIONS. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11302010-121814/ ;
Chicago Manual of Style (16th Edition):
Daggolu, Prashant Reuben. “DEOXYGENATION CATALYSIS ON TITANIA FOR RENEWABLE FUEL APPLICATIONS.” 2011. Doctoral Dissertation, Mississippi State University. Accessed April 10, 2021.
http://sun.library.msstate.edu/ETD-db/theses/available/etd-11302010-121814/ ;.
MLA Handbook (7th Edition):
Daggolu, Prashant Reuben. “DEOXYGENATION CATALYSIS ON TITANIA FOR RENEWABLE FUEL APPLICATIONS.” 2011. Web. 10 Apr 2021.
Vancouver:
Daggolu PR. DEOXYGENATION CATALYSIS ON TITANIA FOR RENEWABLE FUEL APPLICATIONS. [Internet] [Doctoral dissertation]. Mississippi State University; 2011. [cited 2021 Apr 10].
Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11302010-121814/ ;.
Council of Science Editors:
Daggolu PR. DEOXYGENATION CATALYSIS ON TITANIA FOR RENEWABLE FUEL APPLICATIONS. [Doctoral Dissertation]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11302010-121814/ ;
27.
Kumar, Narendra.
Synthesis charcterization and application of titania and
zirconia based ceramic precursors; -.
Degree: Chemistry, 2005, INFLIBNET
URL: http://shodhganga.inflibnet.ac.in/handle/10603/44971
Subjects/Keywords: ceramic precursors; titania; zirconia
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Kumar, N. (2005). Synthesis charcterization and application of titania and
zirconia based ceramic precursors; -. (Thesis). INFLIBNET. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/44971
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kumar, Narendra. “Synthesis charcterization and application of titania and
zirconia based ceramic precursors; -.” 2005. Thesis, INFLIBNET. Accessed April 10, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/44971.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kumar, Narendra. “Synthesis charcterization and application of titania and
zirconia based ceramic precursors; -.” 2005. Web. 10 Apr 2021.
Vancouver:
Kumar N. Synthesis charcterization and application of titania and
zirconia based ceramic precursors; -. [Internet] [Thesis]. INFLIBNET; 2005. [cited 2021 Apr 10].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/44971.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kumar N. Synthesis charcterization and application of titania and
zirconia based ceramic precursors; -. [Thesis]. INFLIBNET; 2005. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/44971
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Kyoto University / 京都大学
28.
Tanaka, Toshiyuki.
Studies on NOx purification catalysts under excess oxygen conditions : 酸素過剰条件下におけるNOx浄化触媒に関する研究.
Degree: 博士(工学), 2013, Kyoto University / 京都大学
URL: http://hdl.handle.net/2433/180359
;
http://dx.doi.org/10.14989/doctor.r12770
新制・論文博士
乙第12770号
論工博第4096号
Subjects/Keywords: NOX; reduction; storage; adsorption; titania
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APA (6th Edition):
Tanaka, T. (2013). Studies on NOx purification catalysts under excess oxygen conditions : 酸素過剰条件下におけるNOx浄化触媒に関する研究. (Thesis). Kyoto University / 京都大学. Retrieved from http://hdl.handle.net/2433/180359 ; http://dx.doi.org/10.14989/doctor.r12770
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tanaka, Toshiyuki. “Studies on NOx purification catalysts under excess oxygen conditions : 酸素過剰条件下におけるNOx浄化触媒に関する研究.” 2013. Thesis, Kyoto University / 京都大学. Accessed April 10, 2021.
http://hdl.handle.net/2433/180359 ; http://dx.doi.org/10.14989/doctor.r12770.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tanaka, Toshiyuki. “Studies on NOx purification catalysts under excess oxygen conditions : 酸素過剰条件下におけるNOx浄化触媒に関する研究.” 2013. Web. 10 Apr 2021.
Vancouver:
Tanaka T. Studies on NOx purification catalysts under excess oxygen conditions : 酸素過剰条件下におけるNOx浄化触媒に関する研究. [Internet] [Thesis]. Kyoto University / 京都大学; 2013. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2433/180359 ; http://dx.doi.org/10.14989/doctor.r12770.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tanaka T. Studies on NOx purification catalysts under excess oxygen conditions : 酸素過剰条件下におけるNOx浄化触媒に関する研究. [Thesis]. Kyoto University / 京都大学; 2013. Available from: http://hdl.handle.net/2433/180359 ; http://dx.doi.org/10.14989/doctor.r12770
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Michigan
29.
Ranney, Elizabeth Grace.
Synthesis and Characterization of Titania Nanotubes for Photocatalytic Water-Splitting and Carbon Dioxide Methanation.
Degree: PhD, Chemical Engineering, 2011, University of Michigan
URL: http://hdl.handle.net/2027.42/89856
► As carbon dioxide emissions from coal-based electricity generation increase, new technologies are required to convert carbon dioxide to useable fuels, such as methane and hydrogen.…
(more)
▼ As carbon dioxide emissions from coal-based electricity generation increase, new technologies are required to convert carbon dioxide to useable fuels, such as methane and hydrogen. The Sabatier reaction would be a useful method of reducing carbon dioxide emissions; however, the generation of the hydrogen needed for this reaction involves the use of fossil fuels. Therefore, a simultaneous method of generating hydrogen from non-fossil fuel sources and subsequent reduction of carbon dioxide to useable fuels, such as hydrogen and methane, is greatly desired. Metal-supported
titania nanotubes are of particular interest due to their photocatalytic properties and high surface area for reactant adsorption. In particular, ruthenium-doped
titania nanotubes are of interest because ruthenium is a highly active carbon dioxide methanation catalyst and
titania offers a wide band gap.
In this study, the properties and photocatalytic activity of
titania nanotubes are studied as a function of synthesis conditions. Using the anodic oxidation method,
titania nanotube dimensions are tailored based on synthesis conditions. In addition, correlations between the synthesis conditions and oxygen content, conductivity, and photocatalytic activity of
titania nanotubes are established.
Titania nanotube formed in low fluoride-containing electrolytes exhibited high oxygen content, reduced conductivity, and superior photocatalytic activity.
Ruthenium-doped
titania nanotubes are evaluated for use as a thermal catalyst for the Sabatier reaction and are compared ruthenium-supported alumina catalyst, the industry standard. A mechanism for simultaneous water-splitting and carbon dioxide methanation over Ru-doped
titania nanotubes under UV light illumination is hypothesized based on Diffuse Reflectance Infrared Fourier Transform Spectrometry. Methane forms over Ru-doped
titania nanotubes at 65°C under UV light illumination, which proves that water splitting and carbon dioxide methanation reaction can occur simultaneously over this photocatalyst.
Finally, the water-splitting reaction is evaluated over Ru-doped anatase
titania, Ru-doped amorphous
titania nanotubes, un-doped anatase
titania nanotubes, Ru-impregnated Degussa P25, and un-doped Degussa P25 photocatalysts. The physical addition of activated carbon to a flow reactor resulted 44% hydrogen generation from photocatalytic water vapor splitting over 7 cm2 of UV-illuminated Ru-doped
titania nanotubes. This is a record photocatalytic conversion of water vapor to hydrogen in a non-microreactor,
titania-based system.
Advisors/Committee Members: Schwank, Johannes W. (committee member), Fogler, H. Scott (committee member), Halloran, John W. (committee member), Savage, Phillip E. (committee member).
Subjects/Keywords: Titania Nanotubes; Photocatalytic Water-splitting; Chemical Engineering; Engineering
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APA (6th Edition):
Ranney, E. G. (2011). Synthesis and Characterization of Titania Nanotubes for Photocatalytic Water-Splitting and Carbon Dioxide Methanation. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/89856
Chicago Manual of Style (16th Edition):
Ranney, Elizabeth Grace. “Synthesis and Characterization of Titania Nanotubes for Photocatalytic Water-Splitting and Carbon Dioxide Methanation.” 2011. Doctoral Dissertation, University of Michigan. Accessed April 10, 2021.
http://hdl.handle.net/2027.42/89856.
MLA Handbook (7th Edition):
Ranney, Elizabeth Grace. “Synthesis and Characterization of Titania Nanotubes for Photocatalytic Water-Splitting and Carbon Dioxide Methanation.” 2011. Web. 10 Apr 2021.
Vancouver:
Ranney EG. Synthesis and Characterization of Titania Nanotubes for Photocatalytic Water-Splitting and Carbon Dioxide Methanation. [Internet] [Doctoral dissertation]. University of Michigan; 2011. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2027.42/89856.
Council of Science Editors:
Ranney EG. Synthesis and Characterization of Titania Nanotubes for Photocatalytic Water-Splitting and Carbon Dioxide Methanation. [Doctoral Dissertation]. University of Michigan; 2011. Available from: http://hdl.handle.net/2027.42/89856
30.
Bidaye, Priyanka P.
Synthesis and catalytic applications of Titania based
nanomaterials and their composites;.
Degree: Chemistry, 2011, Goa University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/12678
None
Reference included in chapters, Publications p.
197-198
Advisors/Committee Members: Fernandes, J B.Subjects/Keywords: Chemistry; Catalytic applications; Titania
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bidaye, P. P. (2011). Synthesis and catalytic applications of Titania based
nanomaterials and their composites;. (Thesis). Goa University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/12678
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bidaye, Priyanka P. “Synthesis and catalytic applications of Titania based
nanomaterials and their composites;.” 2011. Thesis, Goa University. Accessed April 10, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/12678.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bidaye, Priyanka P. “Synthesis and catalytic applications of Titania based
nanomaterials and their composites;.” 2011. Web. 10 Apr 2021.
Vancouver:
Bidaye PP. Synthesis and catalytic applications of Titania based
nanomaterials and their composites;. [Internet] [Thesis]. Goa University; 2011. [cited 2021 Apr 10].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12678.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bidaye PP. Synthesis and catalytic applications of Titania based
nanomaterials and their composites;. [Thesis]. Goa University; 2011. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12678
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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