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Dissertations / Theses on the topic 'Selenium oxides'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Brisdon, A. K. "Matrix isolation infra-red and mass spectrometric studies of some arsenic and selenium oxides." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232998.

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2

SILVA, LARISSA de S. "Avaliação da concentração de metais e elementos terras raras em amostras de sedimentos dos reservatórios dos sistemas Billings e Guarapiranga." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/28040.

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Submitted by Pedro Silva Filho (pfsilva@ipen.br) on 2017-11-22T17:15:11Z No. of bitstreams: 0<br>Made available in DSpace on 2017-11-22T17:15:11Z (GMT). No. of bitstreams: 0<br>O excessivo processo de urbanização da Região Metropolitana de São Paulo resultou na perda das características naturais dos seus cursos d\'água ocasionando profundas alterações nos regimes de vazão e de qualidade. O objetivo desse estudo foi avaliar a concentração de metais tóxicos, os semi-metais As, Sb e Se e os elementos terras raras, presentes em amostras de sedimento superficiais coletadas nos Reservatórios Billin

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3

Jemetio, Feudjio Jean Paul. "Ternary Rare-Earth Coinage Metal Arsenides LnTAs2, Sm2Cu3As3; Quaternary Arsenide Oxides Sm2CuAs3O and Selenides KGd2CuSe4, KLn2Cu3Se5, and K2Ln4Cu4Se9 (Ln = Y, La - Nd, Sm, Gd - Lu; T = Cu, Ag, Au): Syntheses, Crystal Structures and Physical Properties." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1095857535000-60371.

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This thesis describes the syntheses, the crystal structures, and the physical properties of some new ternary and quaternary rare-earth coinage metal arsenides, selenides and oxides. All ternary compounds LnCu1+[delta]As2 (Ln = Y, La, Ce, Nd, Sm, Gd - Lu), LnAg1+[delta]As2 (Ln = La - Nd, Sm), and LnAuAs2 (Ln = Pr, Sm, Gd, Tb) adopt structures closely related to the HfCuSi2 type consisting of PbO-like layers of T and As atoms, square layers of As atoms and layers of Ln atoms separating the former two building units. All copper compounds of this series contain regular square nets of As atoms, whe

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4

Wootton, Lee John. "The oxide fluoride chemistry of bromine, selenium and suplhur." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30014.

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The transition metal carbonyls [Re2(CO)10], [Mn2(CO)10] and [Ru(CO)3(PPh3)2], and elemental iodine have been reacted with Xe(OSeF5)2. The products have been fully characterised by a combination of mass spectrometry, infrared spectroscopy 19F, 13C and 31P{1H} (where appropriate) NMR spectroscopies. Further characterisation of the novel compounds Xe(OSeF5)2, [Re(CO)5(OSeF5)] and [Mn(CO)5(OSeF5)] by EXAFS spectroscopy is reported. An extensive review of the halogen oxide fluorides has been carried out and attempts were made to synthesise a range of fluorides and oxide fluorides of bromine. The br

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5

Worth, Nicholas Gower. "Theoretical studies of compressed xenon oxides, tin selenide thermoelectrics, and defects in graphene." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274462.

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Enormous advances in computing power in recent decades have made it possible to perform accurate numerical simulations of a wide range of systems in condensed matter physics. At the forefront of this progress has been density functional theory (DFT), a very popular approach to tackling the complexity of quantum-mechanical systems that very often strikes a good balance between accuracy and tractability in light of the finite computational resources available to researchers. This thesis describes work utilising DFT methods to tackle two distinct problems. Firstly, the theoretical prediction of s

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6

Hancock, Jared M. "Formation and Analysis of Zinc Oxide Nanoparticles and Zinc Oxide Hexagonal Prisms and Optical Analysis of Cadmium Selenide Nanoparticles." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3867.

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In this dissertation, methods to synthesize ZnO are reported. First, zinc oxide nanoparticles were synthesized with small amounts of transition metal ions to create materials called dilute magnetic semiconductors (DMS). We employed a low temperature sol-gel method that produces ZnO nanoparticles of reproducible size and incorporates cobalt, nickel, and manganese ions into the nanoparticles. Conditions were controlled such that a range of amounts of Co, Ni, and Mn were incorporated. The incorporation was tracked by color changes in the white ZnO powder to blue for Co, green for Ni and yellow fo

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7

Liz, Daiane Gobbatto de. "Síntese de seleno-e teluro acetilenos a partir de alcinos terminais e dicalcogenetos de diorganoíla catalisada por óxido de ferro nanoparticulado." Florianópolis, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/100382.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-graduação em Química<br>Made available in DSpace on 2013-06-25T18:39:15Z (GMT). No. of bitstreams: 1 310280.pdf: 2186920 bytes, checksum: 2e1df773e118acb9e65f6f5f2c9fd793 (MD5)<br>No presente trabalho desenvolveu-se uma nova metodologia sintética para a obtenção de seleno- e teluro acetilenos. Para isto, foram reagidos acetilenos terminais, dicalcogenetos de diorganoíla, carbonato de potássio e óxido de ferro nanoparticulado como catalisador. O método descrito proporciona

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8

Marco, Katia Cristina de. "Avaliação da exposição ao metilmercúrio e dieta rica em selênio sobre os níveis de óxido nítrico na população da região amazônica." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/60/60134/tde-25072007-105904/.

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Desde os anos 50 o mercúrio tem chamado a atenção de muitos pesquisadores. No Brasil, a preocupação inicial se restringia à exposição humana pelo seu uso na mineração do ouro. Entretanto, nos últimos anos a atenção de muitos pesquisadores se voltou para outras fontes de exposição, incluindo fontes naturais. Na região Amazônica, os solos são naturalmente ricos em mercúrio. Devido a constante degradação da floresta, o solo se torna mais exposto à ação das chuvas que facilitam a passagem do mercúrio aos rios. Na água o mercúrio sofre um processo de metilação, se transformando em metilmercúrio (Me

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9

Hemkemeier, Marcelo. "Recuperação de selenio a partir de oxido de ferro resultante de procesamento de pirita." [s.n.], 1994. http://repositorio.unicamp.br/jspui/handle/REPOSIP/255454.

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Orientador: Ranulfo Monte Alegre<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-07-19T15:26:25Z (GMT). No. of bitstreams: 1 Hemkemeier_Marcelo_M.pdf: 2661531 bytes, checksum: 47d2229ca186dbf05573fbf1fefbca18 (MD5) Previous issue date: 1994<br>Resumo: A extração de selênio a nível mundial se dá basicamente de Iodos anódicos de refinarias de cobre e rei eitos industriais de ácido sulfúrico, já que, na maioria dos casos, selênio não é encontrado em depósitos independentes, mas sim, como impurezas de outros

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10

Van, Zandt Nicholas L. "Aqueous Fabrication of Pristine and Oxide Coated ZnSe Nanoparticles." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1623356039586297.

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11

Nordman, Tomas. "In vitro studies on the biosynthesis and reduction of ubiquinone /." Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-475-5/.

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12

Nadarajah, Athavan. "Fundamental Properties of Functional Zinc Oxide Nanowires Obtained by Electrochemical Method and Their Device Applications." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/633.

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We report on the fundamental properties and device applications of semiconductor nanoparticles. ZnO nanowires and CdSe quantum dots were used, prepared, characterized, and assembled into novel light-emitting diodes and solar cells. ZnO nanowire films were grown electrochemically using aqueous soluble chloride-based electrolytes as precursors at temperatures below 90° C. Dopants were added to the electrolyte in the form of chloride compounds, which are AlCl3, CoCl2, CuCl2, and MnCl2. The optical, magnetic, and structural properties of undoped and transition-metal-ion doped ZnO nanowires were ex

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13

Grotto, Denise. "Comparação de parâmetros de estresse oxidativo entre ratos expostos a metilmercúrio em meio aquoso e a peixes contaminados com o metal." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/60/60134/tde-28032012-102429/.

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Os efeitos tóxicos decorrente do consumo de peixes contaminados com metilmercúrio (MeHg) tem sido muito discutido no Brasil, especialmente na Região Amazônica, onde estudos a esse respeito têm mostrado resultados conflitantes. Fatores nutricionais associados à exposição ao MeHg ou a forma na qual o MeHg se encontra ligada no peixe poderiam estar alterando sua toxicidade. Diante destas controvérsias, ratos foram subcronicamente expostos à solução de MeHg, selênio (Se) e óleo de peixe, ou foram alimentados com ração contendo peixes contaminados com MeHg. Biomarcadores de estresse oxidativo, pres

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14

Gutmann, Sebastian. "Electronic Structure Characterization of Nanocrystalline Surfaces and Interfaces with Photoemission Spectroscopy." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3137.

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In this study, photoemission spectroscopy (PES) was used to investigate the electronic properties of nanocrystalline titanium dioxide (TiO2), zinc oxide (ZnO), and cadmium selenide (CdSe). Electrospray deposition technique enabled the preparation of thin films in vacuum from a dispersion prepared outside the vacuum chamber. This method also allowed the step-wise formation of interfaces and the monitoring of the evolution of the electronic structure with intermittent PES characterization. The work function of nanocrystalline TiO2 and ZnO was measured with ultraviolet photoemission spectroscopy

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15

Lambert, Darcy Erin. "Nanostructured Extremely Thin Absorber (ETA) Hybrid Solar Cell Fabrication, Optimization, and Characterization." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/637.

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Traditional sources of electrical energy are finite and can produce significant pollution. Solar cells produce clean energy from incident sunlight, and will be an important part of our energy future. A new nanostructured extremely thin absorber solar cell with 0.98% power conversion efficiency and maximum external quantum efficiency of 61% at 650 nm has been fabricated and characterized. This solar cell is composed of a fluorine-doped tin oxide base layer, n-type aluminum doped zinc oxide nanowires, a cadmium selenide absorber layer, poly(3-hexylthiophene) as a p-type layer, and thermally evap

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16

Chan, Ya-Ting, and 詹雅婷. "Interface between selenium oxyanions and the binary oxide systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/62634449046064413302.

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博士<br>國立臺灣大學<br>農業化學研究所<br>99<br>Removal of selenium oxyanions by binary oxide systems, Al- or Fe-oxide mixed with X-ray noncrystalline SiO2, was previously not well understood. This study evaluates that reactions of Al or Fe with amorphous silica prepared at different pH values by macro- and micro-scale experiments including BET surface area, electrophoresis, stability, Fourier transform infrared (FT-IR), solid-state nuclear magnetic resonance techniques (27Al and 29Si magic-angle spinning (MAS) NMR), and X-ray absorption spectroscopy (XAS). Macro-scale experiments showed that Al(III) could b

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17

Chan, Ya-Ting, and 詹雅婷. "Sorption of selenate and selenite on the binary oxides systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52003523480989444198.

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18

Lee, Cho-Chia, and 李倬嘉. "The Study in Electrochemical Deposition of Zinc Oxide, Zinc Sulfur and Zinc Selenium." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/37223329559904801840.

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碩士<br>國立成功大學<br>化學系碩博士班<br>96<br>In previous researches, semiconductor thin films were usually prepared by dry methods. Electrodeposition is emerging as a method for the synthesis of semiconductor thin films, especially chalcogenides and oxides. Having direct and wide band gap, II-VI compound semiconductors are potential material for use for photovoltaic devices. We use the way to prepare semiconductor in order to find the optimization by patterns. In this experiment, we study to prepare zinc oxide, zinc sulfur and zinc selenium by electrodeposition. According to the parameters of electrodepo

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19

LING, KE TSAI, and 柯采伶. "The effects of different selenium compounds supplementation on glutathione peroxidase and monoamine oxidase in cell models." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/38875334113522115657.

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碩士<br>中華醫事學院<br>生物科技研究所<br>95<br>Selenium (Se) is the important composition of glutathione peroxidase (GPX). Therefore, selenium perform in the role of antioxidation function. The enzyme monoamine oxidase (MAO-B) plays an important role on aging-related diseases, such as Parkinson’s and Alzheimer’s diseases. Because of the observation that MAO-B activity is increased during ageing, it is regarded as the index of ageing. The purpose of this study was to understand the effects of organic / inorganic selenium supplements on GPX enzyme activity, GPX protein expression, and MAO enzyme activity. Fir

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20

Zamamiri-Davis, Faith A. "Up regulation of cyclooxygenase-2 and inducible nitric oxide synthase in macrophages during selenium deficiency role of nuclear factor-kappa B /." 2002. http://www.etda.libraries.psu.edu/theses/approved/PSUonlyIndex/ETD-133/index.html.

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21

Shih, Tsung-Hsiang, and 石宗祥. "Heterojunctions of Zinc Selenide and Zinc Sulfide on Titanium Oxide Nano Particles and Their Photocatalyses." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/ubjw2x.

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博士<br>國立中山大學<br>電機工程學系研究所<br>95<br>High quality ammonium oxofluorotitanate discoid crystal is successfully grown on glass with an aqueous solution of ammonium hexafluorotitanate and boric acid at the molar ratio of 0.6. The concentration of hydrofluoric acid is less on the glass substrate surface and enhances the ammonium oxofluorotitanate nucleation growth. The growth rate is much higher than that grown on dioctadecyldimethylammonium. From the examinations of X-ray diffraction and high-resolution transmission electron microscopy, the crystal shows high crystalline quality and uniformity. Each

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22

Chung, Feng-tsan, and 鍾豐燦. "Application of copper oxide nanorods and zinc selenium quantum dots as the matrix in the surface assisted laser desorption ionization mass spectrometry." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/vmkf6v.

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碩士<br>國立中山大學<br>化學系研究所<br>96<br>Abstract Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is a powerful tool for the analysis of biomolecules such as peptides and proteins and soft ionization technique using the organic matrix. Because of the high concentration of the organic matrix produces high background signals in the low mass range, nanopatticles have been intensively applied in the surface-assisted Laser desorption/ionization-mass spectrometry (SALDI-MS) to reduce the background interferences in the MALDI.-MS. This thesis includes two projects. The first project

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23

Huang, Yu-Ting, and 黃鈺庭. "Enhanced Transport Characteristics of Few-layer Indium Selenide Transistors with Extended Stability Using an Indium Oxide Encapsulated Layer." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/z6j77b.

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碩士<br>國立臺灣大學<br>物理學研究所<br>105<br>Two-dimensional (2D) semiconductors, e.g. black phosphorus and transition metal dichalgenides (TMDs), have attracted considerable interests recently. We investigate the electronic transport properties of Indium Selenide (InSe) by exploring the nature of the semiconductor-metallic contact interface. For 2D-material-based field-effect transistors (FETs), issues regarding substrate and contact are extremely important. We employed hexagonal boron nitride (h-BN) as the substrate of InSe FET to reduce surface roughness and suppress charged-impurity density at the int

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24

Singh, Tejinder. "Atomic-scale Modeling of Transition-metal Doping of Semiconductor Nanocrystals." 2011. https://scholarworks.umass.edu/open_access_dissertations/356.

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Doping in bulk semiconductors (e.g., n- or p- type doping in silicon) allows for precise control of their properties and forms the basis for the development of electronic and photovoltaic devices. Recently, there have been reports on the successful synthesis of doped semiconductor nanocrystals (or quantum dots) for potential applications in solar cells and spintronics. For example, nanocrystals of ZnSe (with zinc-blende lattice structure) and CdSe and ZnO (with wurtzite lattice structure) have been doped successfully with transition-metal (TM) elements (Mn, Co, or Ni). Despite the recent progr

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25

Kepler, Keith Douglas. "Photoluminescence and conductance as probes of the adduct-induced modulation of Cadmium Sulfide and Cadmium Selenide depletion widths II. Mercury-assisted synthesis of intermetallic and metal oxide materials /." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36221817.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1996.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 204-206).

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26

Sarma, Bani Kanta. "Antioxidant Activity Of The Anti-Inflammatory Compound Ebselen And Its Analogues : Role Of Nonbonded Interactions." Thesis, 2008. http://hdl.handle.net/2005/900.

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Although considered as a poison for long time, the importance of selenium as an essential trace element is now well recognized. In proteins, the redox active selenium moiety is incorportated as selenocysteine (Sec), the 21st amino acid. In mammals, selenium exerts its redox activities through several selenocysteine-containing enzymes, which include glutathione peroxidase (GPx), iodothyronine deiodinase (ID) and thioredoxin reductase (TrxR). Although these enzymes have Sec in their active sites, they catalyze completely different reactions and their substrate specificity and cofactor or co-subs

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27

Yuvaraj, D. "Studies On The Growth And Characterization Of II-VI Semiconductor Nanostructures By Evaporation Methods." Thesis, 2009. http://hdl.handle.net/2005/1037.

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In recent years, there has been growing interests on II-VI semiconductor nanostructures, which are suitable for applications in electronics and optoelectronic devices such as solar cells, UV lasers, sensors, light emitting diodes and field emission displays. II-VI semiconductor nanostructures with different morphologies such as wires, belts, rods, tubes, needles, springs, tetrapods, plates, hierarchical structures and so on, have been widely grown by vapor transport methods. However the process conditions used for the growth of nanostructures still remains incompatible for device fabrication.

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