Dissertations / Theses on the topic 'Electrochemical technique'
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Dogan, Bahadir. "Synthesis And Characterization Of Semiconductor Nanowires Via Electrochemical Technique." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611335/index.pdf.
Full textZou, Feng. "Localized electrochemical impedance technique for the study of corrosion processes /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs98/zou1218.pdf.
Full textTaylor, Malcolm G. "Measurement of organic substances in the gas phase using on-line electrochemical techniques." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/12597.
Full textTeh, Tong H. "A novel electrochemical technique for mineral scale coverage and scaling tendency quantification." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2488.
Full textToura, Hanae. "Elaboration and characterization by electrochemical technique CZTS thin layers for photovoltaic application." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/154334.
Full text[ES] El aumento de las necesidades energéticas, particularmente en términos de protección del medio ambiente, ha estimulado en gran medida la investigación en el campo de la conversión fotovoltaica en los últimos años. La radiación solar proporciona un recurso excelente para producir electricidad limpia y sostenible sin contaminación tóxica o calentamiento global, pero en términos de alta demanda de energía eléctrica, así como la toxicidad o escasez de componentes que constituyen las células solares, esta tecnología de transformación solar todavía es algo limitada. En consecuencia estos parámetros constituyen las principales preocupaciones ambientales que rodean a la industria fotovoltaica. El compuesto Cu2ZnSnS4 (CZTS) puede considerarse como uno de los materiales absorbentes más prometedores para las células solares de película delgada de bajo costo. La abundancia y la no toxicidad de los elementos constitutivos de este prometedor material es el tema de este trabajo. Este objetivo nos ha llevado a pensar en optimizar los parámetros que influyen en la formación de capas delgadas por métodos electroquímicos. La técnica de deposición electroquímica o electrodeposición catódica ofrece una alternativa ventajosa desde un punto de vista económico y especialmente ofrece la posibilidad de utilizar sustratos de gran superficie. El enfoque inicial fue determinar los parámetros óptimos para el proceso de desarrollo de película delgada cuaternaria de CZTS. La electrodeposición se implementó mediante la técnica de polarización de un electrodo por el método potenciostático, o sea a potencial constante. Debido a que esta técnica se basa en el potencial de deposición de cada sustancia que constituye el baño electrolítico, se ha llevado a cabo un estudio sobre el efecto de los factores de complejidad para acercar estos potenciales de reducción. Una vez fueron depositadas las capas, se continuó con el estudio del proceso de recocido, que es un paso necesario en la formación de capas absorbentes de CZTS bajo la influencia del factor de complejidad, debido a que conviene reducir la temperatura de recocido mientras se intenta conservan las propiedades del material. Se sintetizaron películas de kesterita de alta calidad con una morfología compacta y una estructura cristalina bien definida a bajas temperaturas usando Na2SO4 como agente acomplejante. Posteriormente, las películas de kesterita CZTS se prepararon en diferentes sustratos conductores (ITO, FTO y Mo / vidrio) para estudiar el efecto del contacto posterior. Comprobamos que el mejor comportamiento se produce para una combinación específica de los parámetros estudiados. En particular este trabajo nos ha permitido controlar la composición de las películas depositadas, dominar el proceso de recocido y usar las técnicas de caracterización necesarias para evaluar la composicion, calidad y propiedades optoelectrónicas de las capas de CZTS sintetizadas. Finalmente, nuestra estrategia implementa una simulación digital de la célula solar CZTS utilizando el software SCAPS-1D. Después de la visualización experimental de las capas delgadas de CZTS en diferentes sustratos conductores, el modelado por el software SCAPS1D del dispositivo de células solares CZTS demostró que el contacto trasero Mo ofrece los mejores rendimientos.
[FR] L'augmentation des besoins énergétiques, notamment en matière de protection de l'environnement, a fortement stimulé la recherche dans le domaine de la conversion photovoltaïque ces dernières années. Le rayonnement solaire fournit une excellente ressource pour produire de l'électricité propre et durable sans pollution toxique ni réchauffement climatique, mais en termes de forte demande d'énergie pour la production de l’électricité ainsi que la toxicité ou la rareté des composants constituent les cellules solaires, cette technologie de transformation solaire est encore un peu limitée. En raison que ces paramètres constituent les principales préoccupations environnementales entourant l'industrie photovoltaïque. Le composé C2ZnSnS4 (CZTS) peut être considéré comme l'un des matériaux de couche absorbante les plus prometteurs pour les cellules solaires en couches minces à faible coût. L’abondance et la non-toxicité des éléments constitutifs ce matériau prometteur fait l'objet de ce travail. De toute évidence, cela nous amène à réfléchir pour optimiser les autres paramètres influençant la formation de couches minces par la méthode d'électrodéposition. Une technique de dépôt par voie électrochimique qui offre une alternative avantageuse du point de vue économique et surtout de la possibilité d’utiliser des substrats de grande surface. Initialement, l'accent était mis sur la détermination des paramètres optimaux pour le processus d’élaboration de couches minces du quaternaire CZTS. L'électrodéposition est mise en œuvre par la technique de polarisation d'une électrode potentiostatique. En raison, que cette technique reposant sur le potentiel de dépôt de chaque substance constituant le bain électrolytique, une étude a été menée sur l'effet des facteurs de complexité afin de rapprocher ces potentiels de réduction. Ensuite, Le processus de recuit qui est une étape nécessaire dans la formation de couches absorbantes en CZTS a été maîtriser, sous l'influence du facteur de complexité en raison de réduire la température de recuit tout en conservant les propriétés du matériau. Des films de kësterite de haute qualité avec une morphologie compacte et une structure cristalline bien définie à basse température ont été synthétisés en utilisant Na2SO4 comme agent complexant. Par la suite, les films de kestérite CZTS ont été préparés sur différents substrats conducteurs (ITO, FTO et Mo / verre) en raison de spécifier l'effet du contact arrière. Le meilleur comportement est une combinaison spécifique des paramètres étudiés. Ces travaux ont permis notamment de maîtriser la composition des films déposés, le processus de recuit ainsi que les techniques de caractérisation nécessaire. Finalement, notre stratégie met en œuvre une simulation numérique de la cellule solaire CZTS à l'aide du logiciel SCAPS − 1D. Après la visualisation expérimentale des couches minces de Czts sur différent substrats conducteur, une modélisation par le logiciel SCAPS-1D du dispositif CZTS cellules solaires a montré que le Mo contact arrière monte les meilleures performances.
[CA] L'augment de les necessitats energètiques, particularment en termes de protecció de l'entorn, ha estimulat en gran mesura la investigació en el camp de la conversió fotovoltaica en els últims anys. La radiació solar proporciona un recurs excel·lent per produir electricitat neta i sostenible sense contaminació tòxica ni escalfament global, però en termes de l'alta demanda d'energia elèctrica, així com la toxicitat o escassetat de components que constitueixen les cèl·lules solars, aquesta tecnologia de transformació solar encara trova barreres limitadores. En conseqüència aquests paràmetres constitueixen les principals preocupacions ambientals que envolten a la indústria fotovoltaica. El compost Cu2ZnSnS4 (CZTS) pot considerar-se com un dels materials absorbents més prometedors per a les cèl·lules solars de pel·lícula prima i de baix cost. L'abundància i la no toxicitat dels elements constitutius d'aquest prometedor material és el tema d'aquest treball. Aquest objectiu ens ha portat a treballar en l’optimització dels paràmetres que influeixen en la formació de capes primes de CZTS per mètodes electroquímics. La tècnica de deposició electroquímica o electrodeposició catòdica ofereix una alternativa avantatjosa des d'un punt de vista econòmic i especialment ofereix la possibilitat d'utilitzar substrats de gran superfície. L'enfocament inicial va ser determinar els paràmetres òptims per al procés de desenvolupament d’una pel·lícula prima quaternària de CZTS. La electrodeposició es va implementar mitjançant la tècnica de polarització d'un elèctrode pel mètode potenciostàtic, o siga a potencial constant. Aquesta tècnica es basa en el potencial de deposició de cada substància que constitueix el bany electrolític es diferent i per tant s'ha dut a terme un estudi sobre l'efecte dels factors de complexitat per tal apropar aquests potencials de reducció de tots els components involucrats. Un cop van ser dipositades les capes, es va continuar amb l’estudi del procés de recuit, que és un pas necessari en la formació de capes absorbents de CZTS sota la influència del factor de complexitat, a causa de la reducció de la temperatura de recuit mentre es conserven les propietats de l'material. Es van sintetitzar pel·lícules de kesterita d'alta qualitat amb una morfologia compacta i una estructura cristal·lina ben definida a baixes temperatures usant Na2SO4 com a agent acomplexant. Posteriorment, les pel·lícules de kesterita CZTS es van preparar en diferents substrats conductors (ITO, FTO i Mo / vidre) per estudiar l'efecte del contacte posterior sobre les capes fines. Obtinguerem que el millor comportament és una combinació específica dels paràmetres estudiats. En particular aquest treball ens ha permès controlar la composició de les pel·lícules dipositades, controlar el procés de recuit i usar les tècniques de caracterització necessàries per avaluar la composició, qualitat i propietats optoelectròniques de les capes de CZTS depositades. Finalment, en la nostra estratègia es va implementar una simulació numérica d’una cèl·lula solar de CZTS utilitzant el programari SCAPS-1D. Després de la visualització experimental de les capes primes de CZTS en diferents substrats conductors, el modelatge pel programari SCAPS-1D del dispositiu fotovoltaic de CZTS va demostrar que el contacte posterior de Mo és el que ofereix el millor rendiment.
I would like to thank the Moroccan Center for Scientific and Technical Research and the Doctoral school of the Polytechnic University of Valencia for the financial assistance they have allocated. I also extend my sincere thanks to the UPV Electron Microscopy Service and to Mr Ángel Sans Tresserras for their help to learn how to work with characterization techniques.
Toura, H. (2020). Elaboration and characterization by electrochemical technique CZTS thin layers for photovoltaic application [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/154334
TESIS
Limson, Janice Leigh. "Electrochemical studies of metal-ligand interactions and of metal binding proteins." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1018239.
Full textHawkins, Thomas Matthew. "Studies toward an electrochemical technique for the patterned immobilisation of biomolecules on surfaces." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286621.
Full textYasinok, Gozde Ceren. "Development Of Electrochemical Etch-stop Techniques For Integrated Mems Sensors." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607538/index.pdf.
Full textC with 10gr/lt. AP. Different silicon etch samples are produced in METU-MET facilities to understand and optimize ECES parameters that can be used for CMOS microbolometers. The etch samples are fabricated using various processes, including thermal oxidation, boron and phosphorus diffusions, aluminum and silicon nitride layer deposition processes. Etching with the prepared samples shows the dependency of the depletion layer between p-substrate and n&
#8209
well, explaining the reason of the previous failures during post-CMOS etching of CMOS microbolometers from the front side. Succesfully etched CMOS microbolometers are achieved with back side etching in 6M KOH at 90 °
C, where &
#8209
3.5V and 1.5V are applied to the p-substrate and n-well. In summary, this study provides an extensive understanding of the ECES process for successful implementations of integrated MEMS sensors.
Korzan, Margaret Antonia. "Application of a passive electrochemical noise technique to localized corrosion of candidate radioactive waste container materials." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/33516.
Full textLisenkov, Aleksey. "Electrochemical synthesis of thin oxide films on titanium and aluminium surfaces using high voltage anodisation technique." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22469.
Full textA síntese eletroquímica de filmes finos de óxido usando a técnica de oxidação de alta tensão e a investigação da estrutura, propriedades físicas e químicas dos filmes obtidos são os principais objetivos desta tese. A anodização de metais sob a ação de vários kilovolts produz filmes com espessura pequena (até 180 nm) e com propriedades diferentes dos filmes formados usando técnicas eletroquímicas convencionais. As camadas de óxido depositadas desta forma conferem, frequentemente, melhores propriedades de proteção, semicondutoras e fotoeletroquímicas. No âmbito deste trabalho filmes finos sobre titânio e alumínio foram preparados em diferentes eletrólitos, incluindo soluções de ácidos e sais, bem como em água desionizada e peróxido de hidrogénio. Mostra-se que os filmes preparados por oxidação com descarga pulsada de alta tensão têm estrutura superficial e propriedades elétricas mais uniformes em comparação com os obtidos por anodização convencional. Outro objetivo do trabalho é a dopagem dos filmes anódicos com diferentes dopantes, por incorporação de espécies do eletrólito durante a formação do filme. Os filmes preparados por oxidação de descarga pulsada de alta tensão no titânio mostram uma melhor resposta de fotocorrente a comprimentos de onda pequenos e uma concentração mais baixa de dadores ionizados, relativamente aos filmes obtidos por anodização convencional. Os filmes preparados por descarga no alumínio e titânio são formados por uma camada compacta. Estudos sobre o processo de descarga revelaram que o principal fator que influencia a cinética de crescimento do filme de óxido é a concentração de defeitos pontuais, que por sua vez é determinada pela composição do eletrólito. Também se mostrou que as técnicas usando alta tensão permitem preparar filmes anódicos não só em soluções convencionais, mas igualmente em outros meios, tal como água desionizada, água destilada e peroxido de hidrogénio, onde a anodização por métodos convencionais (potenciostático ou galvanostático) é impossível. Além disso é revelado que a técnica da descarga pulsada de alta tensão é um método eficiente para encapsulação de nanocilindros de metal, preliminarmente depositados em nanoporos de titânia e alumina alinhados verticalmente.
Electrochemical synthesis of thin oxide films by using the high-voltage oxidation technique and investigation of structure, physical and chemical properties of the obtained films are the main objectives of this thesis. Anodisation of metals under action of several kilovolts allow to produce films with rather low thickness (up to 180 nm) and with properties different from the films created by using conventional electrochemical approaches. The oxide layers deposited in this way often confer advanced protective, semiconductor and photoelectrochemical properties. In the frame of this thesis thin films on titanium and aluminium were prepared in several electrolytes, including solutions of acids and salts as well as in deionised water and hydrogen peroxide. It is shown that the films prepared by powerful pulsed discharge oxidation are characterized by more uniform surface structure and electrical properties in comparison to those obtained by conventional anodization. Another aim of the work is doping of the anodic films with different dopants by incorporation of species from the electrolyte during the film formation. Films prepared by powerful pulsed discharge oxidation technique on titanium demonstrate a significantly improved photocurrent response at short wavelengths and an essentially lower concentration of ionized donors as compared with the films obtained by conventional anodization. The discharge-prepared films on both aluminium and titanium are composed by one compact layer. Studies of the discharge processes revealed that the main factor influencing the kinetics of the oxide film growth is the concentration of point defects which, in turn, is determined by the composition of electrolyte. Also, it was shown that the high voltage techniques allow to prepare anodic films not only in conventional solutions, but also in other media such as deionised water, distilled water and hydrogen peroxide, where anodisation by conventional (potentiostatic or galvanostatic) methods is impossible. Furthermore, the powerful pulsed discharge technique is shown as efficient method for encapsulation of metal nanorods preliminarily deposited into the vertically aligned titania and alumina nanopores.
Arikan, Mehmet Emin. "Determination Of Susceptibility To Intergranular Corrosion Of Uns 31803 Type Duplex Stainless Steel By Electrochemical Reactivation Technique." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609886/index.pdf.
Full textC and then sensitization heat treatments were conducted at 650, 725 and 800°
C with duration ranging from 100 to 31622 min. The microstructural changes were examined by the light optical microscopy (LOM) and scanning electron microscopy (SEM). XRD technique and EDS analysis were used for microstructural evolution. Double Loop Electrochemical Potentiodynamic Reactivation (DLEPR) and standard weight loss immersion acid tests were performed in order to determine the degree of sensitization (DOS) to intergranular corrosion. The surfaces remained after the DLEPR test and the weight loss immersion test were also examined to observe the attack locations and their relationship with the chromium depleted zones. The degree of sensitization is measured by determining the ratio of the maximum current generated by the reactivation (reverse) scan to that of the anodic (forward) scan, (Ir/Ia) x 100. Ir is very small (less than 10-5 A/cm2) for solution annealed samples at 1050°
C for 1 hr and those aged at 650°
C for 100 and 316 min after the solution heat treatment, with the Ir/Ia ratios of 0.027634%, 0.033428% and 0.058928% respectively. Hence these samples were considered as unsensitized and their microstructure was composed of primary ferrite and austenite. However, Ir increased to values as high as 10-2 A/cm2 and even approached Ia for all samples aged for other temperatures and times, associated with high Ir/Ia ratios. The increased degree of sensitization can be attributed to stronger effect of chromium and molybdenum depleted areas. The microstructure was composed of primary ferrite and austenite including also sigma phase and the secondary austenite that would be responsible for the localized chromium impoverishment. The time required for sensitization was shorter in samples aged at higher temperatures. Accordingly ageing times of 1000 min at 725°
C and of 316 min at 800°
C were sufficient, whereas times longer than 10000 min was needed to achieve a sensitized structure at 650°
C.
Mkhohlakali, Andile Cyril. "Development of nanostructured electrocatalysts using electrochemical atomic layer deposition technique for the direct liquid fuel cells By." University of Western Cape, 2020. http://hdl.handle.net/11394/7346.
Full textThe depletion of fossil fuel resources such as coal and the concern of climatic change arising from the emission of greenhouse gases (GHG) and global warming [1] lead to the identification of the 'hydrogen economy' as one of the renewable energy sources and possible futuristic energy conversion solution. Sources of hydrogen as fuel such as water through electrolysis and liquid organic fuel (Hydrogen carriers) have been found as potential game-changers and received increased attention, due to its low-carbon emission.
De, Silva Kandaudage Channa R. "Effect of Manufacturing Technique on Electrochemical Response of a Sulfur Tolerant Planar Solid Oxide Fuel Cell Anode." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1225992967.
Full textZuleta, Marcelo. "Electrochemical and ion transport characterisation of a nanoporous carbon derived from SiC." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173.
Full textHe, Yangyang [Verfasser], Volker [Akademischer Betreuer] Buck, and Xin [Akademischer Betreuer] Jiang. "Deposition of Diamond-like Carbon Films by Liquid Electrochemical Technique / Yangyang He. Gutachter: Xin Jiang. Betreuer: Volker Buck." Duisburg, 2011. http://d-nb.info/1018612033/34.
Full textDøssland, Line Teigen. "Electro-oxidation of ethanol at Pt electrodes with the use of a Dynamic Electrochemical Impedance Spectroscopy (DEIS) technique." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18864.
Full textJin, Xin. "Coal Electrolysis to Produce Hydrogen at Intermediate Temperatures." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1250785769.
Full textTessema, Misle Mesfin. "Shunt Passivation Process for CdTe Solar Cell - New Post Deposition Technique." University of Toledo / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1252430254.
Full textYounis, Ahmed. "Protection of Aluminum Alloy (AA7075) from Corrosion by Sol-Gel Technique." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-83230.
Full textThe present work pertains to the development of sol-gel coatings by optimizing the composition and the application parameters for corrosion protection of aluminum alloy AA7075. Different kinds of silanes e.g. tetraethoxysilane (TEOS), phenyltriethoxysilane (PTES) and phenyltrimethoxysilane (PTMS) have been compared: the sol-gel film prepared from PTMS shows highest hydrophobicity manifested by the best barrier property of this compound. The effect of acetic acid as a catalyst on the chemistry of the sol is investigated in order to estimate the best catalyst concentration for better corrosion protection of the coated samples. The corrosion resistance of the coated samples is found to be decreasing at higher concentrations of the catalyst due to the dissolution of the aluminum oxide at the substrate surface in the acid sol. However, lower concentrations of the catalyst lead to low hydrolysis reactions of the silanes and non-dense sol-gel films have been formed. The heat treatment of the coated aluminum samples is required for cross-linking of the film. The heat treatment at 300 ˚C for 2.5 hours exhibits the best corrosion protection. Higher treatment-temperatures lead to degradation of the properties of the film which can be described in terms of destroying the organic part of the film. Moreover, low treatment-temperatures cause low corrosion protection of the coated aluminum samples which is presumably attributed to the low cross-linking of the sol-gel film at temperatures less than 300 ˚C. The coated aluminum samples are characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques
Chatillon, Yohann. "Méthodes électrochimiques pour la caractérisation des piles à combustibles de type PEM en empilement." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0195/document.
Full textProton exchange membrane (PEM) fuel cells are seen as a promising technology for environmentally friendly energy conversion but its wide spread commercialization need taking up several technological and economic challenges. First, to operate PEM fuel cells require sizeable and energy consuming surrounding systems (compressors, converters,...). Then, elements constituting the cell remain costly because with high technological value and using expensive materials (polymer membrane, catalyst layer,...). The optimization of the system and the surrounding elements is not the only challenge to take up. Indeed, durability of the membrane electrode assembly (MEA) constitutes the major barrier to commercialization of these systems for stationary or transport applications. In order to increase durability of the assemblies, a better understanding of the aging mechanisms is necessary. The first chapter of the thesis introduces a bibliographical study on PEMFC and the fundamental electrochemistry governing the system operation. The second chapter introduces materials composing the different system elements and experimental methods used for PEMFC characterization. The next chapter deals with a study on stack characterization, particularly the development of an electrochemical technique allowing active surface area measurement of the cells composing the stack. Finally, the last chapter deals with heterogeneous aging within PEMFC stacks
Schilling, Sibylle. "Liquid in situ analytical TEM : technique development and applications to austenitic stainless steel." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/liquid-in-situ-analytical-tem-technique-development-and-applications-to-austenitic-stainless-steel(fd490551-7d7a-4b2e-9b1f-917b5f8165b3).html.
Full textCoimbatore, Dhandayuth Venkatesh. "Cerium chloride inhibition for high strength low alloy steel exposed to sulphide polluted seawater." University of Western Australia. School of Mechanical Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0134.
Full textMitchell-Smith, Jonathon. "Advancing electrochemical jet machining techniques." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/54833/.
Full textLopez, Christian. "La technique de l'effet mirage appliquée à la caractérisation de la dynamique ionique des systèmes électroactifs." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10171.
Full textXu, Xiaoyin. "Application of electrochemical techniques to tribology." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419874.
Full textWolowacz, Sorrel Elizabeth. "Novel immobilisation techniques for amperometric biosensors." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319586.
Full textCoombs, Anthony John Martin. "Electroanalytical techniques for cases of medical interest." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257739.
Full textMartin, Rachel D. "Development and application of dynamic electrochemical techniques." Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263603.
Full textWring, Stephen Andrew. "Investigation of novel carbon substrates for electrochemical sensor applications." Thesis, University of the West of England, Bristol, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278891.
Full textEdwards, Martin Andrew. "Development of electrochemical probe microscopy and related techniques." Thesis, University of Warwick, 2008. http://wrap.warwick.ac.uk/1958/.
Full textTaylor, Sarah Frances Rebecca. "Green catalyst preparation using electrochemical and mechanochemical techniques." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580117.
Full textEvans, Nicholas John. "Development of electrochemical techniques for investigating interfacial processes." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340484.
Full textTan, Sze-yin. "Advanced electrochemical techniques for investigating electron transfer kinetics." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/93622/.
Full textKuleshova, Jekaterina. "An investigation of electrochemical techniques in acoustic environments." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/71833/.
Full textAbdelsalam, Mamdouh Elsayed. "Development of microelectrode techniques for analytical and environmental applications." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326794.
Full textTodd, Martin. "Study of ion selective electrodes using impedance and nuclear magnetic resonance techniques." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235683.
Full textLapushkina, Elizaveta. "Anti-corrosion coatings fabricated by cold spray technique : Optimization of spray condition and relationship between microstructure and performance." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI054.
Full textAnticorrosion coatings of Zinc and Aluminium were developed by high pressure and low-pressure Cold Spray techniques, respectively. For Zinc coatings, the dependence of spraying temperature on thickness has been analyzed and the critical temperature of deposition was found at 230 oC. For lower temperatures, the coating was considerably thinner. Dependence of thickness on pressure variation 2 MPa, 2,5 MPa and 3 MPa at constant temperature 290 oC has shown the highest thickness value at 2 MPa. It was confirmed that the coating thickness tends to decrease with the pressure rise. The powder feeding rate as well as the spraying distance were also considered to influence the thickness. The optimal conditions were found for 3ps and 30 mm, respectively. Finally, the gas temperature and pressure were optimized by a Doehlert uniform shell design. Their influences on the zinc coating quality were discussed in terms of microstructure, porosity, thickness, and corrosion resistance. A maximum porosity of 4.2% was reached with the highest pressure and with a moderate temperature (260 °C < T < 300 °C). These conditions promoted erosion of the substrate and a lower accommodation of particles at the impact. Thicker coatings were obtained at higher temperatures because of better particle straining. Two optimal conditions were then identified: 320 °C–2.5 MPa and 260 °C–2.5 MPa. Macroscopic and local electrochemical experiments were performed. Higher corrosion resistance was detected for the condition 320 °C–2.5 MPa. Coatings were enough thick to protect the substrate and the corrosion mechanism was driven by the classical Zn hydroxide and oxide layers. Note that the coating roughness may be optimized later to reduce the corrosion initiation. For aluminum coatings deposited by a low-pressure cold spray method, the optimal spraying parameters according to deposition efficiency were found at 400 °C /0.65 MPa. Ceramic particles were added to densify the coating and allowed to reduce porosity from 8% to 6.4%. Instead of ceramic particle addition, laser surface treatment was performed after coating design. Laser power was not enough high to reach the surface melting, however, the coating microhardness was modified. Results showed a microhardness increase of coatings of 5% with the addition of hard particles whereas the microhardness decreased after the post-heat treatment (pure aluminum coating reduction of 39% and for composite coating 35%). The hardness reduction during the laser treatment was attributed to surface annealing and the release of internal stresses and possible recrystallization with the subsequent grain growth. Finally, the results of the electrochemical investigations showed higher corrosion resistance of ceramic composite coatings than both pure aluminum and laser-treated coatings
Coombs, Helen Victoria. "Application of impedance techniques to the study of living cell monolayers and membranes." Thesis, University of Hertfordshire, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293302.
Full textBilling, Caren. "The determination of trace elements in complex matrices by electrochemical techniques." Pretoria : [s.n.], 2000. http://upetd.up.ac.za/thesis/available/etd-03272006-114615/.
Full textJackson, Thomas James. "The study of peptide ion channels by electrochemical techniques." Thesis, Durham University, 2007. http://etheses.dur.ac.uk/2012/.
Full textEbejer, Neil. "Development and application of pipet-based electrochemical imaging techniques." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/53742/.
Full textWain, Leonie Alison, and n/a. "Investigating the condition of organic coatings on metals: electrochemical evaluation techniques in a conservation context." University of Canberra. Resources, Environmental & Heritage Sciences, 2002. http://erl.canberra.edu.au./public/adt-AUC20050726.144111.
Full textRhodes, Aidan. "Complementary applications of Scanning Kelvin nanoprobe microscopy and electrochemical techniques." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2235/.
Full textAguayo-Salinas, S. "A study of the leaching of bornite by electrochemical techniques." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37386.
Full textButtrey, F. E. "Predictive corrosion testing of tin mill products using advanced electrochemical techniques." Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636192.
Full textJohnston, Matthew Gerard. "Applications of Surface Analysis Techniques to the Study of Electrochemical Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1089811353.
Full textShen, Dai. "Investigation of Charge Transfer Kinetics in Non–Aqueous Electrolytes Using Voltammetric Techniques and Mathematical Modeling." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1574762430962913.
Full textKataoka, Érica Megumi. "Determinação de carbendazim em amostras de suco de laranja por técnicas eletroquímicas. Uma avaliação estatística de desempenho." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-20042016-140959/.
Full textA glassy carbon electrode was modified by depositing a layer of multi-walled carbon nanotubes, functionalized and decorated with gold nanoparticles. This electrode was characterized by optical microscopy, showing a evenly coated surface. In addition, the morphology was investigated by transmission electron microscopy, where the distribution and the average size of 20 nm of the gold nanoparticles were observed. These metal nanoparticles were also characterized by absorption spectroscopy in the UV-vis region showing an absorption maximum at approximately 525 nm, which confirms their average size of 20 nm. The modified electrodes were electrochemically characterized by its voltammetric behavior in a 0.1 mol L-1H2SO4 solution, with a scanning rate of 0.100 V s-1. In these experiments, it became clear the formation and reduction of gold oxide peaks at potentials above 0.8 V vs. Ag/AgCl. It was also observed the proper functioning of the electrodes for the voltammetric response of the redox couple [Ru(NH3)6]Cl2/[Ru(NH3)6]Cl3 in a KCl electrolyte. The performance of the modified electrode for the oxidation of the pesticides: carbaryl, ethyl-parathion, malathion and carbendazim was investigated by square wave voltammetry in phosphate buffer, pH 7, but only the insecticide and fungicide carbendazim showed electroactivity. Thus, future studies focused on this pesticide. The cyclic voltammogram of carbendazim in phosphate buffer showed an oxidation peak and in the reverse scan, a much smaller reduction one. It suggested an EC mechanism and an oxidation reaction scheme was proposed. With the voltammetric profile established, square wave voltammetry was used to determine the calibration curve for the pesticide. With all square wave voltammetric parameters optimized, a linear dependence of the oxidation peak current with the concentration of carbendazim was obtained, with equation: Ip = 0.1 ± 4.30 [carbendazim] with r2 = 0, 9911 (n = 5). This calibration curve showed that the method has a detection limit of 17 x 10-8mol L-1. This methodology was used in the determination of carbendazim in orange juice samples artificially contaminated. A t-test of Student showed that the amounts recovered by voltammetry showed no significant difference in relation to those added to the samples. Thus, this methodology has been validated for use in analysis of orange juice contaminated with carbendazim
Chen, Yue. "Inhibition mechanisms of corrosion inhibitors in multiphase flow conditions using electrochemical techniques." Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1179168537.
Full textEbert, Helen Diane. "The study of adsorbed species using electrochemical and ultra high vacuum techniques." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255669.
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