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Relevant bibliographies by topics / Amorphous modification / Dissertations / Theses

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Dissertations / Theses on the topic 'Amorphous modification'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Almeida, Serrita Avril. "Modification of amorphous silicon nitride surfaces by ion implantation of gallium." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843307/.

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This study was undertaken to investigate the possibility of synthesis of nitride based semiconductors. To this end hydrogenated amorphous silicon nitride (a-SiNx:Hy) has been deposited as the starting material using PECVD (plasma enhanced chemical vapour deposition). Then the effects of implanting gallium into the a-SiNx:H target material have been studied with the aim of forming GaN compounds. Should this technique work, it opens the possibility of carrying out similar synthesis of Al, hi and other nitride based compounds. PECVD hydrogenated amorphous silicon nitride thin films are studied as

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2

Chai, Meng Koon. "Modification of metal contacts to hydrogenated amorphous silicon by ion bombardment." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/843707/.

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This thesis is concerned with the formation, characterisation and application of doped surface layers in hydrogenated amorphous silicon, a-Si:H. In this study, a-Si:H films have been deposited using a plasma enhanced chemical vapour deposition (PECVD) system and have been doped using ion implantation. In order to determine the efficiency of implantation doping various ion species, ion doses, and ion energies were made by direct implantation of impurities at low energies. Coupled with the annealing effect, the effect of doping on damage recovery has been studied. It has been shown that there is

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3

Meng, Xiangtao. "Chemical Modification of Cellulose Esters for Oral Drug Delivery." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/71383.

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Polymer functional groups have critical impacts upon physical, chemical and mechanical properties, and thus affect the specific applications of the polymer. Functionalization of cellulose esters and ethers has been under extensive investigation for applications including drug delivery, cosmetics, food ingredients, and automobile coating. In oral delivery of poorly water-soluble drugs, amorphous solid dispersion (ASD) formulations have been used, prepared by forming miscible blends of polymers and drugs to inhibit crystallization and enhance bioavailability of the drug. The Edgar and Tay

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4

Van, Zyl A. J. P. (Andries Jakobus Petrus). "Synthesis, characterization and testing of nano-structured particles for effective impact modification of glassy amorphous polymers." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53609.

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Thesis (PhD)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: The synthesis of structured nanoparticles, in particular core/shells, IS of great technological and economical importance to modem materials science. One of the advantages of structured particles is that they can be synthesized with either a solid core (albeit soft or hard) or a liquid core (of varying viscosity). This adds to the versatility of structured particles and their relevance to a majority of industrial and commercial endapplications. The synthesis of core/shell particles with liquid cores was investigated for th

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5

Cormier, Lyne Mercedes. "An investigation of passivity and breakdown of amorphous Cr-B thin films for surface modification of metallic biomaterials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/NQ35132.pdf.

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6

Bordel, Catherine. "Etude de la modification par nitruration des propriétés magnétiques des alliages amorphes TbFe et TbFeCo." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10174.

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Nous avons elabore par pulverisation cathodique des couches minces amorphes de tbfe et tbfeco nitrurees, dans le but d'etudier le role de l'azote sur les proprietes magnetiques de ces alliages. Des experiences de spectroscopie d'absorption x mettent en evidence l'existence d'un ordre structural local dans les echantillons tbfe(co), que nous considerons comme l'origine de l'anisotropie magnetique perpendiculaire presente dans ces alliages. Les mesures magnetiques macroscopiques montrent une modification tres importante des proprietes magnetiques, notamment une forte reduction de la temperature

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7

Rios, de Anda Agustin. "Influence of the solvent sorption, additivation, and chemical modification on the molecular mobility dynamics of Polyamide 6,6 amorphous phase and its consequences on the tensile and impact strength properties of this polymer." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10259/document.

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Ce travail s’inscrit dans le projet de développement des réservoirs essence pour voitures à partir des formulations Polyamide 6,6 (PA6,6). Le PA6,6 est un bon candidat pour des applications techniques car il possède des bonnes propriétés thermomécaniques rapportés à son poids. Ces formulations doivent montrer des bonnes propriétés barrière aux essences classiques, aux biofuels (essence contenant de l’éthanol) et aussi à l’eau qui est présente dans l’atmosphère, tout en ayant une bonne tenue aux chocs.Les enjeux scientifiques sont la meilleure compréhension des interactions entre le PA6,6 et de

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8

Rios, de Anda Agustin, and de Anda Agustin Rios. "Influence of the solvent sorption, additivation, and chemical modification on the molecular mobility dynamics of Polyamide 6,6 amorphous phase and its consequences on the tensile and impact strength properties of this polymer." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00933978.

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This work forms part of a project aimed to develop Polyamide 6,6(PA6,6)-based automotive fuel tanks. PA6,6 is a good candidate for technical applications since it possesses good thermo-mechanical properties compared to its weight. These formulations must exhibit good impermeable properties to classic gasoline, to biofuels (gasoline containing ethanol), and to water which is found in the atmosphere, while keeping good impact behavior.The scientific issues are the better understanding of PA6,6-solvent interactions in the case of a series of solvents having different sizes and polarities and also

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9

Brown, Stuart Fyfe. "An investigation into thermally induced structural modifications in isotactic polypropylene and its blends with amorphous terpolymers." Thesis, University of Abertay Dundee, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304681.

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10

Pak, Sang J. "Synthesis and characterization of novel macromolecules/networks via side chain modifications of amorphous poly(arylene ethers)." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/40305.

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11

Kazi, Haseeb. "Plasma Interactions on Organosilicate Glass Dielectric Films and Emerging Amorphous Materials- Approach to Pore Sealing and Chemical Modifications." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801876/.

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In-situ x-ray photoemission (XPS) and ex-situ FTIR studies of nanoporous organosilicate glass (OSG) films point to the separate roles of radicals vs. VUV photons in the carbon abstraction. The studies indicate that reaction with O2 in presence of VUV photons (~123 nm) result in significant carbon abstraction within the bulk and that the kinetics of this process is diffusion-limited. In contrast, OSG exposed to atomic O (no VUV) results in Si-C bond scission and Si-O bond formation, but this process is self-limiting after formation of ~1 nm thick SiO2 surface layer that inhibits further diffusi

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12

Quentin, Alexis. "Modifications structurales de spinelle sous irradiation." Caen, 2010. http://www.theses.fr/2010CAEN2059.

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Ce travail concerne l'étude de matériaux de structure spinelle sous irradiations. Pour cela, des échantillons de ZnAl2O4 polycristallins et MgAl2O4 monocristallins ont été irradiés par différents ions lourds de hautes énergies. Les échantillons de ZnAl2O4 ont été étudiés par microscopie électronique en transmission ainsi que par diffraction des rayons X en incidence rasante et analyse Rietveld. Les échantillons de MgAl2O4 ont été étudiés en spectroscopie optique. Les résultats concernent principalement l'amorphisation et les modifications de la structure cristalline de ZnAl2O4, notamment l'inv

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13

Quentin, Alexis. "Modifications structurales de spinelles sous irradiation." Phd thesis, Université de Caen, 2010. http://tel.archives-ouvertes.fr/tel-00549397.

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Ce travail concerne l'étude de matériaux de structure spinelle sous irradiations. Pour cela, des échantillons de ZnAl2O4 polycristallins et MgAl2O4 monocristallins ont été irradiés par différents ions lourds de hautes énergies. Les échantillons de ZnAl2O4 ont été étudiés par microscopie électronique en transmission ainsi que par diffraction des rayons X en incidence rasante et analyse Rietveld. Les échantillons de MgAl2O4 ont été étudiés en spectroscopie optique. Les résultats concernent principalement l'amorphisation et les modifications de la structure cristalline de ZnAl2O4, notamment l'inv

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14

Laquièvre, Aurélie. "Mécanismes élémentaires de plasticité des systèmes polymères amorphes : influence de la modification de la structure macromoléculaire par la chimie « Click »." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10124/document.

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Les objectifs de cette thèse portent sur l’élaboration de nouveaux matériaux réticulés réversibles et sur la compréhension de leurs propriétés mécaniques. Pour atteindre ces objectifs, nous avons exploité deux stratégies : la réaction de Diels-Alder (DA) à partir de copolymères parfaitement définis dotés de motifs furanes et la remarquable réactivité des azlactones vis-à-vis des amines. Les copolymères ont été synthétisés par polymérisation radicalaire contrôlée afin d’obtenir des copolymères parfaitement définis fonctionnalisés en chaine latérale. Différents copolymères réticulés ont été prép

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15

Kail, Fatiha. "Etude in-situ par ellipsométrie et spectrométrie de masse du transport de l'hydrogène dans a-Si:H : Cinétique de diffusion et modifications de structure." Reims, 2005. http://theses.univ-reims.fr/exl-doc/GED00000210.pdf.

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Cette thèse porte sur l'étude par ellipsométrie et spectroscopie de masse du transport de l'hydrogène dans le silicium amorphe hydrogéné (a-Si:H). L'objectif est de mettre en lumière le rôle de l'hydrogène dans la cristallisation du a-Si:H et dans sa dégradation sous éclairement, ce qui présente un intérêt primordial pour l'optimisation des dispositifs photovoltaïques. La première partie est consacrée au rôle de l'hydrogène dans l'effet Staebler-Wronski. Nos résultats montrent que l'hydrogène sort de la couche sous illumination et que la diffusion de l'hydrogène sous éclairement est un effet à

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16

Kumar, Sunil. "Chemical modification of some amorphous chalcogenide thin films." Thesis, 1988. http://localhost:8080/xmlui/handle/12345678/3080.

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17

Hayes, Heather J. "Heterogeneous polymer modification: Polyolefin maleation in supercritical carbon dioxide and amorphous fluoropolymer surface modification." 1999. https://scholarworks.umass.edu/dissertations/AAI9950159.

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Three distinct heterogeneous polymer modification reactions are explored in this work. The first is a bulk reaction commonly conducted on polyolefins—the free radical addition of maleic anhydride. This reaction was run using supercritical carbon dioxide (SC CO2) as the solvent. The second was the chemical surface modification of an amorphous fluorocopolymer of tetrafluoroethylene and a perfluorodioxole monomer (Teflon AF). Several reactions were explored to reduce the surface of the fluorocopolymer for the enhancement of wettability. The last modification was also on Teflon AF and involved the

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18

VACCARO, Gianfranco. "Structural Modification Processes in Bulk and Nano-sized Amorphous SiO2 Systems." Doctoral thesis, 2011. http://hdl.handle.net/10447/102366.

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