Дисертації з теми "Sulfide nanoparticles"
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Junkermeier, Chad Everett. "Simulation and Analysis of Cadmium Sulfide Nanoparticles." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2704.pdf.
Повний текст джерелаRijal, Upendra. "Suppressed Carrier Scattering in Cadmium Sulfide-Encapsulated Lead Sulfide Nanocrystal Films." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1402409476.
Повний текст джерелаFrenzel, Johannes. "Structural, electronic and optical properties of cadmium sulfide nanoparticles." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1170678349152-44850.
Повний текст джерелаMbese, Johannes Zanoxolo. "Synthesis and characterization of metal sulfide nanoparticles/polymer nanocomposites." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1016190.
Повний текст джерелаFrenzel, Johannes. "Structural, electronic and optical properties of cadmium sulfide nanoparticles." Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A23935.
Повний текст джерелаPerera, Jayalath Pathirannehelage Dimuthu Nuwan. "Photocatalytic Properties of Zinc Selenide/Cadmium Sulfide Core-shell Nanoparticles." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1370994697.
Повний текст джерелаMonahan, Bradley Michael. "Synthesis and Characterization of Phase-pure Copper Zinc Tin Sulfide (Cu2ZnSnS4) Nanoparticles." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1404732007.
Повний текст джерелаAllehyani, S. H. A., R. Seoudi, D. A. Said, A. R. Lashin, and A. Abouelsayed. "Synthesis, Characterization, and Size Control of Zinc Sulfide Nanoparticles Capped by Polyethylene Glycol." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42490.
Повний текст джерелаMousavi, R. A., A. A. Sepahy, and M. R. Fazeli. "Biosynthesis, Purification and Characterization of Cadmium Sulfide Nanoparticles Using Enterobacteriaceae and their Application." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34903.
Повний текст джерелаXiong, Zhong Zhao Dongye. "Destruction of perchlorate and nitrate by stabilized zero-valent iron nanoparticles and immobilization of mercury by a new class of iron sulfide nanoparticles." Auburn, Ala, 2007. http://repo.lib.auburn.edu/2007%20Fall%20Dissertations/Xiong_Zhong_0.pdf.
Повний текст джерелаYang, Zhiqiang. "Preparation of palladium, palladium sulfide, cadmium selenide nanoparticles and magnesium oxychloride, magnesium hydroxide nanorods." Diss., Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/891.
Повний текст джерелаRoffey, A. R. "Dithiocarbamate complexes as single source precursors to metal sulfide nanoparticles for applications in catalysis." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1437012/.
Повний текст джерелаYukna, Jennifer. "Computational and experimental investigations of the structural properties, electronic properties, and applications of silver, gold, mercury selenide, silver sulfide, and nickel sulfide nanoparticles /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1482010021&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Повний текст джерела"Department of Chemistry and Biochemistry." Keywords: Electronic properties, Silver, Gold, Mercury selenide, Silver sulfide, Nickel sulfide, Nanoparticles. Includes bibliographical references (p. 170-180). Also available online.
Gonzalez-Estrella, Jorge Gonzalez. "Toxicity of Engineered Nanoparticles to Anaerobic Wastewater Treatment Processes." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/347117.
Повний текст джерелаSarker, Niloy Chandra. "Application of Nanoparticles in Livestock Manure for Understanding Hydrogen Sulfide and Greenhouse Gas Reduction Mechanism." Diss., North Dakota State University, 2018. https://hdl.handle.net/10365/27897.
Повний текст джерелаUSDA-NIFA
Romano, Natalie C. "Photophysical Properties of Amphiphilic Naphthalene Diimide Nanoassemblies and Cadmium Sulfide Nanoparticles and Poly(phenylene-ethynylene) Nanocomposites." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399035654.
Повний текст джерелаDas, Prajna Paramita. "Enhancement of photoactivity by synthesizing nanotube-nanoparticle composites of TIO₂ and CdS for generation of hydrogen via splitting of water." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1460754.
Повний текст джерелаZemke, Jennifer M. 1983. "Surface Modification and Multiple Exciton Generation Studies of PbS Nanoparticles." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/12085.
Повний текст джерелаSolar energy is a green alternative to fossil fuels but solar technologies to date have been plagued by low conversion efficiencies and high input costs making solar power inaccessible to much of the developing world. Semiconductor nanoparticles (NPs) may provide a route to efficient, economical solar devices through a phenomenon called multiple exciton generation (MEG). Through MEG, semiconductor NPs use a high-energy input photon to create more than one exciton (electron-hole pair) per photon absorbed, thereby exhibiting large photoconversion efficiencies. While MEG has been studied in many NP systems, and we understand some of the factors that affect MEG, a rigorous analysis of the NP-ligand interface with respect to MEG is missing. This dissertation describes how the NP ligand shell directly affects MEG and subsequent charge carrier recombination. Chapter I describes the motivation for studying MEG with respect to NP surface chemistry. Chapter II provides an in-depth overview of the transient absorption experiment used to measure MEG in the NP samples. Chapter III highlights the effect of oleic acid and sodium 2, 3-dimercaptopropane sulfonate on MEG in PbS NPs. The differences in carrier recombination were accounted for by two differences between these ligands: the coordinating atom and/or the secondary structure of the ligand. Because of these hypotheses, experiments were designed to elucidate the origin of these effects by controlling the NP ligand shell. Chapter IV details a viable synthetic route to thiol and amine-capped PbS NPs using sodium 3-mercaptopropane sulfonate as an intermediate ligand. With the versatile ligand exchange described in Chapter IV, the MEG yield and carrier recombination was investigated for ligands with varying headgroups but the same secondary structure. The correlation of ligand donor atom to MEG is outlined in Chapter V. Finally, Chapter VI discusses the conclusions and future outlook of the research reported in this dissertation. This dissertation includes previously published and unpublished co-authored material.
Committee in charge: Dr. Geraldine L. Richmond, Chairperson; Dr. David R. Tyler, Advisor; Dr. Mark C. Lonergan, Member; Dr. Catherine J. Page, Member; Dr. Hailin Wang, Outside Member
Greene, Robert Crandall. "The separation of copper sulfide ore minerals from gangue using magnetic nanoparticles functionalized with peptides selected via phage display : a proof of concept." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61528.
Повний текст джерелаApplied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
Al, Chaghouri Hanan. "Novel routes to the synthesis and functionalization of metallic and semiconductor thin films and nanoparticles." Thesis, University of Manchester, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632330.
Повний текст джерелаTang, Lu. "Nanoparticules mimes des propriétés biologiques des GAGs : vers un inhibiteur sélectif de CXCL12." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS072.
Повний текст джерелаHéparan Sulfate (HS) is a linear polysaccharide that modulates the biological activities of numerous proteins. In order to elucidate the interaction between HS and proteins, the synthesis of HS is an invaluable tool, but the synthesis is sometimes difficult. Our group has demonstrated that the combinatorial mixtures obtained by self-assembly of different combinations of disaccharide derivatives (lactose and persulfated lactose) on gold plan surfaces could recognize specifically some HS binding proteins, such as the isoforms of the chemokine CXCL12 or IFNγ. Because of the toxicity of gold nanoparticles, we have also adapted this method to lipid nanoparticles. Using the conditions that have already improved during the synthesis of lactose and persulfated lactose derivatives, we have synthesized two other disaccharide derivatives, which were closer to the real structure of HS. These new derivatives were used to prepare the gold and lipid nanoparticles at the aim of comparing the properties with lactose and persulfated lactose. The tests of affinities with different proteins are in progress
El, Sayed Shehata Nasr Sameh. "Supramolecular Chemistry: New chemodosimeters and hybrid materials for the chromo-fluorogenic detection of anions and neutral molecules." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/52598.
Повний текст джерела[ES] Resumen La presente tesis doctoral titulada "Química supramolecular: Nuevos dosímetros químicos y materiales híbridos para la detección cromo-fluorogénica de aniones y moléculas neutras." está basada en la aplicación de principios básicos de la química supramolecular y de la ciencia de materiales en el desarrollo de sensores ópticos para aniones y moléculas neutras. El segundo capítulo de esta tesis doctoral está dedicado a la preparación de dosímetros químicos para la detección cromo-fluorogénica de fluoruro, diisopropil fluorofosfato (DFP) y sulfuro de hidrógeno. Para la detección óptica del anión fluoruro se sintetizó un derivado de piridina funcionalizado con un t-butildimetilsilil éter. En este capítulo también se describe la preparación de un dosímetro químico para la detección de DFP, que es un simulante de agentes nerviosos. Este dosímetro está basado en un estilbeno funcionalizado con una sal de piridinio que contiene grupos hidroxilo y silil éter en su estructura. Finalmente se prepararon dos familias de sensores para la detección óptica de hidrógeno sulfuro. La primera familia de sensores consiste en fluoróforos comunes funcionalizados con 2,4-dinitrofenil éteres. Los sensores preparados no presentaron una emisión de fluorescencia importante mientras que, en presencia del anión hidrógeno sulfuro, se observó un aumento significativo. La segunda familia de dosímetros también estaba compuesta por ciertos fluorofóros pero, en este caso, funcionalizados con grupos azida y sulfonilazida. Los dosimétros preparados, siguiendo esta segunda aproximación, tampoco dieron una fluorescencia significativa observándose un aumento de la misma al añadir el anión hidrógeno sulfuro. El tercer capítulo de esta tesis doctoral está dedicado a la preparación de materiales híbridos nanoscópicos funcionalizados con puertas moleculares y su aplicación en protocolos de reconocimiento. En primer lugar se preparó un material para la detección óptica de glutatión (GSH). Para ello se emplearon nanopartículas de MCM-41 mesoporosas como soporte inorgánico. Los poros del soporte fueron cargados con el colorante safranina O y la superficie externa funcionalizada con oligo(etilenglicol) conteniendo enlaces disulfuro. También se prepararon y caracterizaron varios materiales híbridos para la detección selectiva del anión hidrógeno sulfuro. En este caso también se empleó, como soporte inorgánico, sílice mesoporosa MCM-41. Los poros del soporte inorgánico fueron cargados con [Ru(bipy)3]2+ y la superficie externa funcionalizada con varios complejos macrocíclicos de Cu(II). El material sensor final fue obtenido al añadir el anion hexametafosfato, que compleja con los complejos de Cu(II), produciendo un bloqueo de los poros.
[CAT] Resum La present tesi doctoral titulada "Química supramolecular: Nous dosímetres químics i materials híbrids per a la detecció cromo-fluorogènica d'anions i molècules neutres." està basada en l'aplicació dels principis bàsics de la química supramolecular i de la ciència dels materials en el desenvolupament de sensors òptics per a anions i molècules neutres. El segon capítol d'aquesta tesi doctoral està dedicat a la preparació de dosímetres químics per a la detecció cromo-fluorogènica de fluorur, diisopropil fluorofosfat (DFP) i sulfur d'hidrogen. Per a la detecció òptica de l'anió fluorur es va sintetitzar un derivat de piridina funcionalitzat amb un t-dibutildimetilsilil èter. En aquest capítol també es descriu la preparació d'un dosímetre químic per a la detecció de DFP, que és un simulant d'agents nerviosos. Aquest dosímetre està basat en un estilbè funcionalitzat amb una sal de piridina que conté grups hidroxil i silis èter en la seua estructura. Finalment varen ser preparades dues famílies de sensors per a la detecció òptica de sulfur d'hidrogen. La primera família consisteix en fluoròfors comuns funcionalitzats amb 2,4-dinitrofenil èters. Els sensors preparats no presentaren una emissió de fluorescència significativa mentre que, en presencia de l'anió hidrogen sulfur, es va observar un augment significatiu. La segona família de dosímetres també estava composada per certs fluròfors però, en aquest cas, funcionalitzats amb grups azida i sulfonilazida. Els dosímetres preparats, seguint aquesta segona aproximació, tampoc donaren una fluorescència significativa observant-se un augment de la mateixa al afegir l'anió hidrogen sulfur. El tercer capítol d'aquesta tesi doctoral està dedicat a la preparació de materials híbrids nanoscòpics funcionalitzats amb portes moleculars i la seua aplicació en protocols de reconeixement. En primer lloc es va preparar un material per a la detecció òptica de glutatió (GSH). Per a aquest propòsit es varen emprar nanopartícules MCM-41 mesoporoses com a suport inorgànic. Els porus del suport varen ser carregats amb el colorant safranina O i la superfície externa funcionalitzada amb oligo(etilenglicol) que contenia enllaços disulfurs. També varen ser preparats i caracteritzats diversos materials híbrids per a la detecció selectiva de l'anió hidrogen sulfur. En aquest cas també es va emprar, com a suport inorgànic, sílice mesoporosa MCM-41. Els porus del suport inorgànic varen ser carregats amb [Ru(bipy)3]2+ i la superfície externa funcionalitzada amb diversos complexos macrocíclics de Cu(II). El material sensor final es va obtindre al afegir l'anió hexametafosfat, que es complexa amb macrocicles de Cu(II), produint un bloqueig dels porus.
El Sayed Shehata Nasr, S. (2015). Supramolecular Chemistry: New chemodosimeters and hybrid materials for the chromo-fluorogenic detection of anions and neutral molecules [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/52598
TESIS
Gabriel, Stefanie. "Assessment of Lead Chalcogenide Nanostructures as Possible Thermoelectric Materials." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-128413.
Повний текст джерелаMullaugh, Katherine M. "Formation and persistence of cadmium sulfide nanoparticle in aqueous solution." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 232 p, 2009. http://proquest.umi.com/pqdweb?did=1885682071&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаSee, Erich Michael. "Modeling Plasmon Resonance for a Gold Nanoparticle Plasmon-Enhanced Cadmium Sulfide Biosensor." Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1249499557.
Повний текст джерелаLeyral, Géraldine. "Synthèse et structuration de sulfure de molybdène promu nickel en présence de liquide ionique ou de polymère hydrosoluble amphiphile : application en catalyse hétérogène." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20266.
Повний текст джерелаWith the progressive decrease of oil resources, the production of biomass fuel is a fast growing field. This could limit the concentration of carbon dioxide in the atmosphere and thus the global warming. The production of this kind of fuel requires the use of catalysts such as nickel or cobalt promoted molybdenum sulfide. These materials are also crucial during the refining of oil, an essential step to limit atmospheric pollution during the classic fuel combustion. New methods to synthesize and structure NiMoS catalysts have been developed in this work. Two solvants have been studied: formamide and water. The addition of an amphiphilic water-soluble polymer (PEO113-b-PLLA32) in water and of ionic liquids (BMIMNTf2 and BMIMBF4) in formamide led to the structuring of the materials with specific surface areas up to 55 m2g-1. This is a high value for this kind of material, especially since the synthesis is carried out under soft conditions. The first catalytic tests dealt with decanoïc acid hydrodesoxygenation and highlighted a promising activity for these materials
Cisse, Seydou. "Use of Biopolymer Entrapped Sulfate Reducing Bacteria and Metal Nanoparticles for Effective Aqueous Sulfate Removal." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/27234.
Повний текст джерелаFulbright Program Fellowship
National Science Foundation (NSF, Grant: CCMI-1125674)
Whyte, John Morrison. "Surfactant-inhibited barium sulphate nanoparticles for use in drilling fluids." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231876.
Повний текст джерелаClarke, Emma Victoria Faye. "An investigation into silver nanoparticles removal from water during sand filtration and activated carbon adsorption." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/29959.
Повний текст джерелаRiddin, Tamsyn Louise. "Investigating the enzymatic mechanism of platinum nanoparticle synthesis in sulfate-reducing bacteria." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1004024.
Повний текст джерелаDedeh, Amina. "Impact d'un sédiment dopé aux nanoparticules d'or ou de sulfure de cadmium sur un invertébré et un poisson d'eau douce." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0068/document.
Повний текст джерелаThe aim of this thesis was to determine the impact of two types of metal nanoparticles (cadmium sulphide - CdS - and gold - Au) on two aquatic models (tubifex worms and zebrafish Danio rerio). The approach has been to dope the Garonne sediment with the two types of nanoparticles and characterize the effect of this contamination on the two animals using multiple markers at different levels of biological organization (biochemical responses, neurotransmission activity, genotoxicity, gene expression and bioturbation activity). The effects were evaluated after exposure to contaminated sediment in experimental microcosms systems for twenty days. In a number of cases this work revealed an effect of the nanoparticles that was not due to metal but to the nanoparticulate properties. Indeed, in the case of CdS nanoparticles, we observed alterations in the genome as well as the modification of the bioturbation activity of worms tubifex in response to the contamination of nanoparticles but not to that of the ionic form. In this work we observed the release of gold nanoparticles from the sediment into the water column, and its potential bioavailability to fish. These nanoparticles were causing DNA damage in both organisms, modifying the expression of certain genes and increased acetylcholinesterase activity in zebrafish. Bioturbation results showed no effects of gold nanoparticles on the movement of worms
Nqakala, Zimkhitha Biancah. "Synthesis of DMSO based silver nanoparticles for application in wound healing." University of Western Cape, 2021. http://hdl.handle.net/11394/8233.
Повний текст джерелаSilver nanoparticles (AgNPs) apart from being chemically significant, have shown a lot of health benefits, the most studied being their anti-bacterial and anti-inflammatory properties. These biological properties can be further enhanced by adding compounds with known medical properties giving rise to even more desired potent materials. Anti-bacterial and cytotoxicity studies show that these AgNPs can kill bacteria, prevent infections and regenerate skin cells. On the other hand, previous studies have reported dimethyl sulfoxide (DMSO) with attractive wound healing abilities specifically cell growth promotion. It was then envisaged that the combination of DMSO and AgNPs could lead to a potent wound healing agent. It is a well-known fact that non-healing wounds pose a socioeconomic threat to a large population worldwide.
2023
Salajková, Zita. "Plazmonicky aktivní elektrochemické elektrody na bázi nanotrubic sulfidu wolframičitého pokrytých zlatými nanočásticemi." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-320220.
Повний текст джерелаRahman, Md Mahbubur. "Durability of nano-modified fly ash concrete to external sulfate attack under different environmental conditions." Canadian Society for Civil Engineering (CSCE), 2014. http://hdl.handle.net/1993/24055.
Повний текст джерелаYun, Seonguk. "Sulfur Tolerant Supported Bimetallic Catalysts for Low Temperature Water Gas Shift Reaction." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573224656177825.
Повний текст джерелаMoussaoui, Myriam. "Elaboration et caractérisations de nouveaux matériaux diélectriques structurés par des nanoparticules de sulfure de zinc : applications prospectives." Thesis, Saint-Etienne, 2011. http://www.theses.fr/2011STET4001.
Повний текст джерелаOur efforts have been devoted to the development of simple approach to synthesize ZnS nanoparticules (NPs) by melting process in a glassy matrix with the aim to create a controlled optical index variation. In this thesis, we present the formation of ZnS NPs in the glassy matrix and study of their optical properties. The nanocomposite incorporating ZnS in the host medium was prepared using the melting process from a mixture of the raw materials. We have prepared various glass samples with ZnS NPs size ranging from 1.8 à 7 nm. These samples were treated (heat treatment ± UV insulation with 244 nm laser) and characterized by UV-Vis absorption, FTIR, photoluminescence spectroscopy, Raman measurements and XPS. The refractive index measurements of these nanostructured composite glasses have been carried out and show an important increase with ZnS concentrations and treatments. We also present the elaboration of small and monodisperse ZnS nanopowder with size ranging from 3 to 100 nm by a simple, low-cost and mass production chemical method. The NPs were characterised by X-ray powder diffraction (XRD), UV-vis absorption and photoluminescence spectroscopy. The photocatalytic activity of ZnS nanopowders was investigated by using different colorant water dispersed. ZnS NPs appear to be a good candidate for potential environmental applications such as water purification. We also present application of fluorescent ZnS nanoparticles as cellular biomarkers. Fluorescent microscopy images of osteoblastic MC3T3-E1 cells revealed that the ZnS nanoparticles were biocompatible and were penetrated cells and nucleus regardless of their size. Hence, the ZnS NPs can be good candidates for drug delivery and bio-imaging applications
Holzhausen, Cornelia [Verfasser]. "Anti-Inflammatory Dendritic Polyglycerol Sulfate Nanoparticle: Biodistribution, Elimination, Cellular Localisation and Toxicopathology in Mice / Cornelia Holzhausen." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1140761439/34.
Повний текст джерелаRaulin-Woznica, Katarzyna. "Étude du dopage par des ions actifs et des nanoparticules semi-conductrices de matériaux sol-gel pour l'optique : interaction dopant-matrice et croissance localisée de nanoparticules par irradiation laser." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10100/document.
Повний текст джерелаThis work concerns the elaboration by sol-gel process and the characterization of porous SiO2 xerogels doped with active ions and/or with semiconducting nanoparticles of CdS. The aim of the study was to contribute to the comprehension of the doping effects on structural and optical properties of the final material. We showed by Raman spectroscopy and nitrogen absorption-desorption that the insertion of active ions, such as Cd2+, Pb2+ or Eu3+, changes the kinetics and the mechanisms of the gelation and densification of the network of SiO2. The choices of the pH and of the concentration of the doping ion have distinct effects on the kinetics. This study was completed by emission spectroscopy using Eu3+ ion as luminescent probe to describe the environment of this ion in the porous matrix. The SiO2 xerogels were post-doped with CdS nanoparticles. The post-doping technique consists in the diffusion of an aqueous solution containing cadmium and sulphur precursors in the porous matrix. The nanoparticles crystallize in situ by heat treatment. The nanoparticle size and their emission properties were determined by UVvisible absorption as well as emission and excitation spectroscopies. The results showed the influence on optical properties of trap levels introduced by the surface defects of nanoparticles and an enhancement of the Eu3+ emission in SiO2 xerogel co-doped with CdS :Eu3+. A second method for the formation of CdS nanoparticles was used. CdS microstructures were created locally by pulsed laser irradiation of sol-gel matrices containing the CdS precursors
Le, Bars Maureen. "Devenir du zinc des produits résiduaires organiques après méthanisation et recyclage agricole : rôle des nanoparticules de sulfure de zinc." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0034.
Повний текст джерелаAgricultural recycling of organic waste (OW), raw or after a treatment like anaerobic digestion (AD) and/or composting is common. It is necessary to assess the environmental impact of OW agricultural recycling after anaerobic digestion since this technology is gaining interest, particularly regarding zinc, an abundant element in OW. In order to properly evaluate the risk, zinc speciation must be known. First, we have shown that AD promote the formation of nano-ZnS that is therefore the main species of Zn (> 70%) in AD digestates. This unstable species is transformed during composting of 1 to 3 months. Size and strain are parameters that can explain nanocrystals reactivity. We showed that the more nano-ZnS are small and the higher the strain is. Interaction with thiol containing organic molecules, potentially present in anaerobic digesters, release nano-ZnS structural strain and control its growth. Finally, amended soil characteristics have a key role for nano-ZnS fate: the components of clayey and iron-oxide-rich soils are able to immobilize Zn released by nano-ZnS dissolution, unlike sandy soils components. This work gives a better understanding of zinc dynamics in cultivated ecosystems subject to spreading of organic waste
Keller, Jana [Verfasser]. "Biokinetics and inhalation toxicity of cerium dioxide and barium sulfate nanoparticles after 1, 4, 13 and 52 weeks of exposure / Jana Keller." Gießen : Universitätsbibliothek, 2015. http://d-nb.info/1078849315/34.
Повний текст джерелаLiu, Ruiqiang Zhao Dongye. "Fate, transport, and environmental availability of Cu(II) applied in catfish aquaculture ponds and enhanced immobilization of soil-bound lead using a new class of stabilized iron phosphate nanoparticles." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2006%20Fall/Dissertations/LIU_RUIQIANG_19.pdf.
Повний текст джерелаYuan, Yuan. "Regulatory Effect of Elastin Based Biomaterial on Cellular Behavior and Its Application on Wound Repair and Regeneration." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6159.
Повний текст джерелаZatta, Kelly Cristine. "Desenvolvimento de um sistema terapêutico micro-/nanoestruturado contendo 5-fluorouracil para administração pulmonar." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/149501.
Повний текст джерелаThe absence of a single therapeutic agent suitable for the treatment of metastatic melanoma and the potential of 5FU chemotherapy (5-fluorouracil) motivated this study, which aimed the development of carrier systems based on micro-/ and nanostructures containing 5FU to increase the therapeutic efficacy and reduce toxicity of this drug by pulmonary administration. Two different formulations of dry powders were developed with natural polymers, chondroitin sulfate and hydroxypropyl-methyl-cellulose, denomined 5FU-MS and 5FU-NS, using the spray-drying and vibrational piezoelectric atomization techniques, respectively. Both formulations were evaluated in terms of physico-chemical characteristics, in vivo toxicological behaviors (C. elegans and in Wistar rats), bioavailability and penetration in the lung tissue by quantifying of drug free fraction by lung microdialysis. The physicochemical analysis showed that were obtained as micrometric (5FU-MS) and submicron particles (5FU-NS), with average diameters of particle 2.546 ± 0.07 m and 0.652 ± 0.03 m, and respirable fraction (FR%) of 55.12 ± 2.98 and 76.84 ± 0.07, respectively. Both showed suitable characteristics and properties for pulmonary delivery, with deposition capacity in the middle and deep lung portions. The toxicity of the formulations evaluated in C. elegans considered the death rate, body development, DL50 and production of ROS to nematodes under acute and chronic treatment. The results showed significant reduction of toxicity, reducing the death rate and greater development of the groups treated with 5FU-MS and 5FU-NS formulations compared to the free drug, suggesting satisfactory safety profile for administration. In addition, 5FU-MS proved to be a pro-oxidant agent, representing a promising differential of this system which can achieve greater sensitization of tumoral cells with lower doses. Acute pulmonary toxicity was evaluated by analyzing LDH, and total protein in the bronchoalveolar lavage fluid (BALF) after combined administration of 5FU-MS formulations and 5FU-NS for administration as a single therapeutic system (5FU-MS/NS) and analysis of lung tissue damage in rats. The results of biochemical and histological analysis indicated the low potential to induce tissue damage from the pulmonary administration of combined formulations, compared to free drug. Analysis of the pharmacokinetic profile for pulmonary microdialysis showed the successful development of carrier systems, making it possible to double the t1/2 of 5FU and significantly increase bioavailability in lung tissue. The results indicate the effectiveness of the formulations 5FU-MS and 5FU-NS in achieving the therapeutic benefits of the drug 5FU at lower doses and higher dosing intervals. This thesis work presents a promising approach to cancer therapy with lung metastasis recurrence.
Ben, slimen Fedia. "Caractérisation des verres luminescents préparés par la méthode sol-gel." Thesis, Angers, 2016. http://www.theses.fr/2016ANGE0019/document.
Повний текст джерелаGlasses doped with rare earth ions and/or semiconductor nanoparticles continues to be the subject of several studies due to their effectiveness in optoelectronic fields. Indeed, these materials are among the potential candidates for photonic applications such as optical fiber amplifiers, light converters, sensors and 3D waveguides. As part of this thesis, silica-based glasses (SiO2) doped with europium ions (Eu3+) were prepared by the sol-gel process. In order to better disperse the rare earth ions and improve their emission, the glasses were codoped with phosphorus and/or aluminum. Semiconductor nanoparticles (CdS) were also introduced into the glass in order to increase the absorbance of the excitation light and to obtain a more intense emission of Eu3+ ions. The prepared glasses were analyzed by photoluminescence and by the technique of Fluorescence line narrowing (FLN). These experimental measurements were followed by theoretical simulations using the molecular dynamics method (DM) to study the effect of phosphorus and/or aluminum on the local environment of the europium ions and their dispersion in the vitreous matrix. The presence of two types of europium ion sites in the glass silicophosphates has been demonstrated and confirmed by two techniques (FLN and DM). The effect of CdS nanoparticles on the emission of Eu3+ ions in a glass silicophosphate was also studied and it was shown that the emission of Eu3+ ions is considerably dependent on theconcentration of CdS nanoparticles and annealing temperature
Ligmajer, Filip. "Pokročilé plazmonické materiály pro metapovrchy a fotochemii." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2018. http://www.nusl.cz/ntk/nusl-387738.
Повний текст джерелаChavillon, Benoit. "Synthèse et caractérisation d'oxydes transparents conducteurs de type p pour application en cellules solaires à colorant." Phd thesis, Université de Nantes, 2011. http://tel.archives-ouvertes.fr/tel-00674543.
Повний текст джерелаLarsson, Emanuel. "Evaluation of the Dual-Modal usage of contrast agents by means of Synchrotron X-ray Computed Microtomography and Magnetic Resonance Imaging using Macrophages loaded with Barium Sulfate and Gadolinium Nanoparticles for Detection and Monitoring in Animal Disease Models." Doctoral thesis, Linköpings universitet, Molekylär ytfysik och nanovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122607.
Повний текст джерелаLa, Ly B. T. "From Gd2O3suspension to nanocomposite: Synthesis, properties and radiation protection." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2017. https://ro.ecu.edu.au/theses/2019.
Повний текст джерелаEl, Zein Basma. "Growth and characterization of zinc oxide (ZnO) nanostructures for photovotaic applications." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10141/document.
Повний текст джерелаTo date, the development of nanotechnology has launched new ways to design efficient solar cells. Strategies have been employed to develop nanostructure architectures of semiconductors, metals, and polymers for solar cells. In this research we have considered the Lead sulfide (PbS) nanoparticles with their tunable band gap and optical properties to harvest the entire solar spectrum which can improve the optical absorption, and charge generation. On the other hand, Zinc oxide (ZnO) nanowires will provide the charge separation and transportation. The ZnO Nanowires sensitized with PbS nanoparticles might significantly impact power conversion efficiency of the solar cells Driven by these unique properties, we demonstrate the successful growth of self catalyzed ZnO nanowires on silicon and glass substrates, by pulsed laser deposition (PLD) using ZnO nanowall network with honeycomb structure as seed layer. We identified that the growth parameters are vital to control the crystallinity, morphology and the defect levels in the synthesized ZnO nanowires. SEM, XRD, TEM, HRTEM analysis show that the nanostructures are highly crystalline and are vertically oriented. We also report the in-situ growth of PbS nanoparticles without linker on the surface of well –oriented ZnO NWs by (SILAR) technique. The PbS Nanoparticles are packed tightly on the surface of the ZnO Nanowires with different sizes and densities, without insulating nature organic ligands, which might affect both the electronic structure at the interface and the electron - transfer rate. The SEM, TEM, HRTEM, PL and XRD analysis, confirm the attachment of the spherical shape polycrystalline PbS nanoparticles. We propose at the end of the thesis the p-PbS /n-ZnO hetero-junction with its future applications in solar cells
Corkery, Robert, and robert corkery@anu edu au. "Artificial biomineralisation and metallic soaps." The Australian National University. Research School of Physical Sciences and Engineering, 1998. http://thesis.anu.edu.au./public/adt-ANU20080124.190014.
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