Relevant bibliographies by topics / HRTEM (High Resolution Transmission Electron Microscopy) / Dissertations / Theses
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Dissertations / Theses on the topic 'HRTEM (High Resolution Transmission Electron Microscopy)'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Dickinson, Calum. "Metal oxide porous single crystals and other nanomaterials : an HRTEM study." Thesis, University of St Andrews, 2007. http://hdl.handle.net/10023/217.

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Three-dimensional porous single crystals (PSCs) are a recent development in the growing world of mesoporous material. The mesoporosity allows for the material to retain their nanoproperties whilst being bulk in size. The current work concentrates on chromium oxide and cobalt oxide PSCs formed in the templates SBA-15 and KIT-6. HRTEM is the main technique used in this investigation, looking at the morphology and single crystallinity of these materials. A growth mechanism for the PSC material is proposed based on HRTEM observations. XRD studies revealed that the confinement effect, caused by the
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2

Tao, Shizhong. "High-resolution transmission electron microscopy of copper-oxide compounds /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10775.

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3

Kong, Lisa (Lisa Fanzhen). "High-resolution transmission electron microscopy of III-V FinFETs." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119065.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 47-50).<br>III-V materials have great potential for integration into future complementary metal-oxide-semiconductor technology due to their outstanding electron transport properties. InGaAs n-channel metal-oxide-semiconductor field-effect transistors have already demonstrated promising characteristics, and the antimonide material system is emerging as a candidate for p-channel devices. As transistor te
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4

Chand, Gopal. "Aberration determination and compensation in high resolution transmission electron microscopy." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362968.

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5

Pierce, William Renton. "High-resolution transmission electron microscopy and electron energy loss spectroscopy of doped nanocarbons." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/highresolution-transmission-electron-microscopy-and-electron-energy-loss-spectroscopy-of-doped-nanocarbons(dd1340ba-4a31-49e5-a421-9dd47ea35256).html.

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Graphene, a one-atom thick sheet of carbon, is the thinnest, strongest and most electrically conductive material ever discovered. Alongside carbon nanotubes it is part of the group of nanocarbons whose unique properties have sparked huge interest in possible applications, including electronic devices, solar cells and biosensors. Doping of these materials allows for the modification of their optical and electronic properties,which is crucial to realising these applications. Studying the properties of these doped materials at atomic resolution and finding controllable and industrially scalable r
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6

Landauer, Matthew Noah. "Indirect modes of coherent imaging in high-resolution transmission electron microscopy." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627491.

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7

Gilkes, Kai William Reginald. "Tetrahedral carbon : studies using high resolution transmission electron microscopy and neutron scattering." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281952.

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8

Tosaka, Masatoshi. "STRUCTURAL STUDY ON POLYMER CRYSTALS BY CRYOGENIC HIGH-RESOLUTION TRANSMISSION ELECTRON MICROSCOPY." Kyoto University, 2000. http://hdl.handle.net/2433/181349.

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9

Said, Aurore. "Matériaux Nanohybrides à Large Bande Interdite: Études de Synthèses, Propriétés et Applications." Phd thesis, Université de la Méditerranée - Aix-Marseille II, 2007. http://tel.archives-ouvertes.fr/tel-00266833.

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Ma thèse consiste en l'étude du greffage des molécules de colorant sur des nanoparticules de ZnO, de leurs propriétés optiques et morphologiques, ainsi que les interactions électroniques entre le ZnO inorganique et le colorant organique. Nous avons créé des nanohybrides à base de nanosphères et nanobâtonnets de ZnO par deux voies: Ablation laser femtoseconde en phase liquide et Procédés chimiques. Des particules sphériques de quelques nanomètres sont générées par ablation laser révélant par la photoluminescence l'effet de confinement quantique due à la réduction de taille. Transfert d'excitati
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10

Dunin-Borkowski, Rafal Edward. "Fresnel and high resolution techniques for the characterisation of ultrathin semiconductor layers." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338135.

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11

Titmuss, Katherine Louise. "Application of advanced high resolution transmission electron microscopy techniques to complex inorganic compounds." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615781.

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12

Haibo, E. "Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:19c3b989-0ffb-487f-8cb3-f6e9dea83e63.

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This thesis concerns the application of aberration corrected scanning transmission electron microscopy (STEM) to the quantitative analysis of industrial Pd-Pt core-shell catalyst nanoparticles. High angle annular dark field imaging (HAADF), an incoherent imaging mode, is used to determine particle size distribution and particle morphology of various particle designs with differing amounts of Pt coverage. The limitations to imaging, discrete tomography and spectral analysis imposed by the sample’s sensitivity to the beam are also explored. Since scattered intensity in HAADF is strongly dependen
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13

Cosgriff, Eireann Catherine. "Image formation mechanisms in three-dimensional aberration-corrected scanning transmission electron microscopy." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:e7ddeaf7-4d16-47d3-9248-3b2cfa7d0a6b.

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This thesis considers the theory and calculations of image formation mechanisms for various modes of three-dimensional imaging in aberration-corrected scanning transmission electron microscopy. Discrete tomography is used to determine and refine the three-dimensional structure of molecular nanowire bundles. The structure determination is expedited by the use of annular dark-field imaging, an incoherent imaging mode which provides directly interpretable images. The development of spherical aberration correctors and the subsequent reduction in probe sizes, including the depth of field, has made
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14

LIU, LIYING. "SUPERCONDUCTIVITY IN BI/NI HYBRID SYSTEMS: A NANOSTRUCTURAL/ANALYTICAL STUDY BY HIGH RESOLUTION TRANSMISSION ELECTRON MICROSCOPY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32938@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO<br>Apesar do bismuto cristalino e do níquel não serem supercondutores, as bicamadas Bi/Ni mostram uma transição supercondutora a 4 K, o que tem atraído muita atenção. Existem diferentes interpretações para a supercondutividade (SC) em Bi/Ni, por exemplo: a presença de Ni induz a transformação de estrutura de Bi, originalmente romboédrica torna-se cúbica de f
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15

Mühlbacher, Marlene. "High-resolution characterization of TiN diffusion barrier layers." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-120394.

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Titanium nitride (TiN) films are widely applied as diffusion barrier layers in microelectronic devices. The continued miniaturization of such devices not only poses new challenges to material systems design, but also puts high demands on characterization techniques. To gain understanding of diffusion processes that can eventually lead to failure of the barrier layer and thus of the whole device, it is essential to develop routines to chemically and structurally investigate these layers down to the atomic scale. In the present study, model TiN diffusion barriers with a Cu overlayer acting as th
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16

Ni, Na. "Study of oxidation mechanisms of zirconium alloys by electron microscopy." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:c60cdca2-e576-414a-8a10-eb3a60264998.

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The current work is part of the EPSRC MUZIC project, which established the collaboration among several universities to carry out a multidiscipline study on the breakaway oxidation of zirconium alloys. The overall goal of the project is to further understand the mechanisms of the oxidation and breakaway process of zirconium alloys. This thesis describes the nano/micro-structural study and nano-analysis of the corroded zirconium alloys using up-to-date TEM and 3D focused ion beam (FIB) slicing and reconstruction techniques. The work mainly focused on the characterization of ZIRLO. The oxide morp
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17

Knaub, Nikolai [Verfasser], and Kerstin [Akademischer Betreuer] Volz. "Structural analysis of dilute bismide alloys by means of high resolution scanning transmission electron microscopy / Nikolai Knaub ; Betreuer: Kerstin Volz." Marburg : Philipps-Universität Marburg, 2016. http://d-nb.info/1115332031/34.

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18

Akhtar, Sultan. "Transmission Electron Microscopy of Graphene and Hydrated Biomaterial Nanostructures : Novel Techniques and Analysis." Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-171991.

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Transmission Electron Microscopy (TEM) on light element materials and soft matters is problematic due to electron irradiation damage and low contrast. In this doctoral thesis techniques were developed to address some of those issues and successfully characterize these materials at high resolution. These techniques were demonstrated on graphene flakes, DNA/magnetic beads and a number of water containing biomaterials. The details of these studies are given below. A TEM based method was presented for thickness characterization of graphene flakes. For the thickness characterization, the dynamical
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19

Drehmann, Rico. "Haftmechanismen kaltgasgespritzter Aluminiumschichten auf keramischen Oberflächen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-229668.

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Aluminiumschichten werden durch Kaltgasspritzen auf fünf verschiedene poly- und monokristalline keramische Werkstoffe (Al2O3 , AlN, SiC, Si3N4 , MgF2 ) appliziert. Dabei erfolgt eine Variation der Substrattemperatur und der Partikelgröße. Ausgewählte Proben werden einer nachfolgenden Wärmebehandlung unterzogen. Die im Fokus der Arbeit stehende Erforschung der an der Grenzfläche zwischen Aluminium und Keramik wirkenden Haftmechanismen erfolgt sowohl mithilfe einer mechanischen Charakterisierung (Stirnzugversuche) als auch durch verschiedene mikroskopische, spektroskopische und hochauflösende Me
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20

Li, Siqian. "The atomic struture of inversion domains and grain boundaries in wurtzite semonconductors : an investigation by atomistic modelling and high resolution transmission electron microscopy." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC252/document.

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Au cours de ce travail, nous avons étudié deux types de défauts interfaciaux: domaines d’inversion (DI) et joints de grains (JG) dans des semiconducteurs de structure wurtzite (nitrures- d’éléments III, ZnO et l’hétérostructure ZnO/GaN) en utilisant le MET haute résolution et la modélisation ab initio. Dans le cas des DI, nos analyses théoriques montrent qu'une configuration tête-à-tête avec une séquence d'empilement à l’interface AaBbAa-AcCaA (H4) est la structure la plus stable dans les composés binaires (nitrures et ZnO wurtzites). De plus, un gaz d’électrons (2DEG) ou de trous (2DHG) à 2 d
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21

Liu, Juan. "Influence of grain size, morphology and aggregation on galena dissolution." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/26202.

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The acidic, non-oxidative dissolution of galena nanocrystals has been studied using both microscopic and wet-chemical methods. The effects of particle size, shape, aggregation state, and grain proximity on dissolution rates were investigated. Nearly monodisperse galena nanocrystals with an average diameter of 14.4 nm and a truncated cubic shape were synthesized. In the dissolution experiments of dispersed nanocrystals, galena nanocrystals attached on the surface of a TEM grid were exposed to deoxygenated HCl solutions (pH 3) at 25 °C. Capping groups on nanocrystals were removed via a washing
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22

Li, Fang. "Microstructural properties of semiconductor nanostructures." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:396024e1-a646-40ca-8212-cad925b18311.

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Semiconductor nanostructures have attracted great interest owing to their unique physical properties and potential applications in nanoscale functional devices. The enhancement of the physical properties of semiconductor nanostructures and their performance in devices requires a deeper understanding of their fundamental microstructural properties. Thus this thesis is focused on the experimental and theoretical studies of the microstructural properties of two important semiconductor nanostructures: axial heterostructured silicon nanowires with varying doping and indium nitride colloidal nanopar
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23

Severs, John. "Microstructural characterisation of novel nitride nanostructures using electron microscopy." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:6229b51e-70e7-4431-985e-6bcb63bd99d1.

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Novel semiconductor nanostructures possess a range of notable properties that have the potential to be harnessed in the next generation of optical devices. Electron microscopy is uniquely suited to characterising the complex microstructure, the results of which may be related to the growth conditions and optical properties. This thesis investigates three such novel materials: (1) GaN/InGaN core/shell nanowires, (2) n-GaN/InGaN/p-GaN core/multi-shell microrods and (3) Zn<sub>3</sub>N<sub>2</sub> nanoparticles, all of which were grown at Sharp Laboratories of Europe. GaN nanowires were grown by
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24

Hu, Jing. "High resolution characterisation of corrosion and hydrogen pickup of Zr-Nb cladding alloys." Thesis, University of Oxford, 2016. http://ora.ox.ac.uk/objects/uuid:a986c6e5-bba4-48c2-8e30-7f77ebe5313e.

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Zr cladding alloys have been used for many years as the first safety barrier layer of a nuclear reactor. However, the recent Fukushima accidents and industrial demands to increase the burnup of fuels have led to increasing interest in a detailed mechanistic understanding of aqueous corrosion and hydrogen pickup and the performance at high temperatures. As part of an international MUZIC-2 programme (Mechanistic Understanding of Zr Corrosion and Hydrogen pickup), I have used a range of advanced microscopy techniques to study the microstructure, the nanoscale chemistry and the porosity in a serie
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25

Tancu, Yolanda. "Electrospun nanofibers as solid phase extraction sorbents and support for alkylphenols colorimetric probes." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1012997.

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The thesis reports on fabricating alternative solid phase extraction (SPE) sorbents and colorimetric probes based on electrospun nanofibers for alkylphenols (APs). Hydroxyl methylated styrene [poly(co-styrene-CH₃OH)] and 3-oxobutanoate styrene [poly(co-styrene-OCOCH₃COCH₃)] copolymers were synthesized and fabricated into sorbent materials by electro-spinning/spraying. The fabricated morphologies consisting of bead free fibers, beaded fibers and particles were evaluated as SPE sorbents using batch experiments. Electropun fibers proved to be better sorbents as they exhibited extraction efficienc
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Crane, Samantha. "High resolution transmission electron microscopy analysis of the influence of grain boundary and triple grain junction crystallinity and chemistry on silicon carbide-based armor with small additions of aluminum, boron, and carbon." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010845.

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27

Monnier, Laurine. "Analyses structurales par microscopie électronique d'hexaferrites magnétiques Ca2+xFe16-xO26-(x/2)." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC224/document.

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Ce mémoire porte sur la synthèse et la caractérisation de composés hexaferrites dans le système Ca-Fe-O. Ce travail a permis d’isoler quatre composés sous forme polycristalline ayant pour composition (Ca4Fe5O13)1-x(Fe9O12)1+x (x= 0,334 ; 0,301 et 0,128) et (Ca4Fe5O13)(Fe4O4). Leur structure cristalline a été déterminée à partir de données de diffraction électronique acquises en mode tomographie par précession des électrons et validée à l’aide de l’imagerie haute résolution (HREM et HAADF). Les différents modèles structuraux ont également été confirmés par diffraction des rayons X et des neutro
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28

Robertson, Alexander William. "Synthesis and characterisation of large area graphene." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:aee750dd-41b8-4462-9efa-4e89e06e0ed7.

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The pursuit of high quality, large area graphene has been a major research focus of contemporary materials science research, in the wake of the discovery of the multitude of exceptional properties exhibited by the material. The DPhil project was undertaken with the objective of developing an understanding of the growth of large graphene sheets by chemical vapour deposition (CVD), and also in the subsequent characterisation of their material properties. By conducting atmospheric pressure CVD growth at high methane flow rates, it was found that few-layered graphene (FLG) could be deposited on a
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29

Mutta, Geeta Rani. "Propriétés structurales, optiques et électroniques des couches d’InN et hétérostructures riches en indium pour applications optoélectroniques." Caen, 2012. http://www.theses.fr/2012CAEN2013.

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Les semi-conducteurs nitrures (AlN, GaN, InN) focalisent une activité de recherche intense en raison de nombreuses applications comme les diodes électroluminescentes, les composants de puissance ou hyperfréquence. Dans cette recherche, nous avons abordé le travail sous deux angles: a) la conduction électrique dans les couches d'InN produites par croissance épitaxiale aux jets moléculaires assistée par plasma (PAMBE) et une recherche sur l'origine de la forte émission bleue dans les puits de quantiques d'InGaN/GaN. L'accumulation d'électron en surface dans les couches d'InN constitue une limita
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Kovarik, Libor. "Microstructural study and modeling of metastable phases and their effect on strenghthening [sic] in Al-Mg-Cu-Si alloying system." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1149006665.

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31

Grando, Stroppa Daniel. "Modelamento de nanocristais pelo uso de técnicas avançadas de QHRTEM." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263400.

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Orientador: Antonio Jose Ramirez Londono<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-19T15:09:29Z (GMT). No. of bitstreams: 1 GrandoStroppa_Daniel_D.pdf: 7882693 bytes, checksum: 21824c021c6088d93bb5e17e9b0386ff (MD5) Previous issue date: 2011<br>Resumo: O desenvolvimento de tecnologias baseadas em nanoestruturas é dependente da criação de modelos confiáveis que possam suportar a obtenção de materiais com características controladas. Neste contexto, o aprimoramento de técnicas de caracterização quantitativa
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Jamshidi, Zavaraki Asghar. "Engineering Multicomponent Nanostructures for MOSFET, Photonic Detector and Hybrid Solar Cell Applications." Doctoral thesis, KTH, Teoretisk kemi och biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177609.

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Silicon technologyhas been seekingfor a monolithic solution for a chip where data processing and data communication is performed in the CMOS part and the photonic component, respectively. Traditionally, silicon has been widely considered for electronic applications but not for photonic applications due to its indirect bandgap nature. However, band structure engineering and manipulation through alloying Si with Ge and Sn has opened new possibilities. Theoretical calculations show that it is possible to achieve direct transitions from Ge ifit is alloyed with Sn. Therefore, a GeSn system is a cho
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Lagos, Paredes Maureen Joel. "Efeitos estruturais na quantização da condutância de nanofios metálicos." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259172.

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Orientador: Daniel Mario Ugarte<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-08T07:13:58Z (GMT). No. of bitstreams: 1 LagosParedes_MaureenJoel_M.pdf: 3881181 bytes, checksum: 517e8507ccdf35f0fa7a7f9fcb4b3b84 (MD5) Previous issue date: 2007<br>Resumo: O estudo de fios metálicos de tamanho atômico (NF's) tem atraído grande interesse devido aos novos efeitos químicos e físicos neles observados. Entre esses novos fenômenos podemos destacar a quantização da condutância, efeito que deve ser fundamental no de
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Lagos, Paredes Maureen Joel. "Efeitos estruturais na condutância quântica e na deformação mecânica de nanofios metálicos." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277588.

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Orientador: Daniel Mario Ugarte<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-16T08:26:46Z (GMT). No. of bitstreams: 1 LagosParedes_MaureenJoel_D.pdf: 15612188 bytes, checksum: 76b816022716e5ae1bb5de0ff150c8ca (MD5) Previous issue date: 2010<br>Resumo: Fios metálicos de tamanho atômico (NF's) apresentam novos efeitos químicos e físicos devido ao seu tamanho reduzido, onde pode-se destacar a condutância quântica. NF's são usualmente gerados através de um procedimento simples: duas superfícies metálicas são col
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Nieto, González Luis. "Origem e estabilidade de nanoestruturas de InAs sobre ligas de InP e InGaAs." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278482.

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Orientador: Mônica Alonso Cotta<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-17T22:17:37Z (GMT). No. of bitstreams: 1 NietoGonzalez_Luis_D.pdf: 3428571 bytes, checksum: 13775c720d8ebcf8c855b532ae715b49 (MD5) Previous issue date: 2007<br>Resumo: Neste trabalho estudamos os mecanismos de crescimento durante a epitaxia por feixe químico de nanoestruturas III-V baseadas no sistema InAs/InP. Particularmente, foram estudados nanofios e ilhas de InAs sobre uma camada buffer InP(001) e nanofios de InAs sobre uma mat
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Oezaslan, Mehtap, Anne-Kristin Herrmann, Matthias Werheid, et al. "Structural Analysis and Electrochemical Properties of Bimetallic Palladium–Platinum Aerogels Prepared by a Two‐Step Gelation Process." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-236752.

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Multi-metallic aerogels have emerged as a promising unsupported, high surface area-based metal material for different applications in heterogeneous catalysis and electrochemistry. The fabrication of these multi-metallic aerogels is based on a complex gelation process which is characterized by controlled aggregation of metallic nanoparticles to form a macroscopic network structure in aqueous solution. However, achieving structural homogeneity of the multi-metallic aerogels in terms of diameter of the nanochains and chemical composition at the nano- as well as at the macro-scale is still a great
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Tizei, Luiz Henrique Galvão. "Análise quantitativa de imagens de microscopia eletrônica de transmissão de resolução atômica : aplicação ao estudo da rugosidade e interdifusão em interfaces de poços quânticos de InGaP/GaAs." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277636.

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Orientador: Daniel Mario Ugarte<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-10T20:45:53Z (GMT). No. of bitstreams: 1 Tizei_LuizHenriqueGalvao_M.pdf: 14343917 bytes, checksum: 2e436bc0147e26276c682a3c9af78ce9 (MD5) Previous issue date: 2008<br>Resumo: A completa caracterização de novos fenômenos físicos e químicos em sistemas com dimensões nanométricas requer conhecimento detalhado: a) do arranjo atômico; b) de como os diferentes elementos químicos dos materiais se redistribuem nas interfaces/superfíci
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Kajbaji, Mohamed El. "Etude du joint de grain [SIGMA] = 9 dans le silicium parfait, déformé et recuit par microscopie électronique à haute résolution." Grenoble 1, 1986. http://www.theses.fr/1986GRE10102.

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Etude des mecanismes d'interaction joint de grain dislocations lors de la deformation du bicristal, mettant en evidence la dissociation des dislocations entrant dans le joint, leur perte d'identite et l'interaction entre eux des residus. Determination des structures des dislocations residuelles. Apparition de precipites lors du recuit du bicristal deforme
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39

Xi, Yunfei. "Synthesis, characterisation and application of organoclays." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16483/.

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This thesis focuses on the synthesis and characterisation of organoclays. X-ray diffraction has been used to study the changes in the basal spacings of montmorillonite clay and surfactant-intercalated organoclays. Variation in the d-spacing was found to be a step function of the surfactant concentration. Three different molecular environments for surfactant octadecyltrimethylammonium bromide (ODTMA) within the surface-modified montmorillonite are proposed upon the basis of their different decomposition temperatures. High-resolution thermogravimetric analysis (HRTG) shows that the thermal de
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40

Ghedjatti, Ahmed. "Etude structurale des nanotubes de carbone double parois." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066051/document.

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Le nanotube de carbone double parois représente le cas idéal pour étudier la nature de l'interaction entre parois des tubes multiparois. En partant d'échantillons dispersés de DWNTs synthétisés par CVD, nous avons pu, grâce à la microscopie électronique en transmission haute résolution (METHR), établir une procédure robuste de détermination structurale des configurations. Il apparaît alors que certaines configurations structurales sont privilégiées alors que d'autres sont interdites, mettant en évidence les effets du couplage interparoi. À partir de simulations Monte Carlo réalisées sur des DW
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41

Lucas, Shakeela. "Green synthesis and characterization of silver nanoparticles (AgNPs) from Bulbine frutescens leaf extract and their antimicrobial effects." University of the Western Cape, 2020. http://hdl.handle.net/11394/7251.

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>Magister Scientiae - MSc<br>Combating antimicrobial resistant infections caused by nosocomial pathogens poses a major public health problem globally. The widespread use of broad-spectrum antibiotics for the treatment of wound infections has led to the appearance of multidrug-resistant (MDR) microbes which further exacerbates the growth of microbes amongst patients. It may result in prolonged debility of the patient and an increase in healthcare costs due to prolonged hospital stays and expensive treatment regimens to avoid patient-patient transmission. Therefore, it is imperative that alterna
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42

Bernardi, Cécile. "Analyse haute résolution spatiale par spectrométrie des pertes d'énergie d'électrons transmis : application en microélectronique à la caractérisation de couches minces (inférieur à 8NM) d'oxydes nitrurés." Grenoble 1, 1996. http://www.theses.fr/1996GRE10027.

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Ce travail evalue la potentialite de la microanalyse par spectrometrie de perte d'energie, couplee a un microscope electronique en transmission dote d'un canon a effet de champ, pour caracteriser chimiquement des structures de la microelectronique. Cette etude est principalement axee sur la caracterisation d'oxydes nitrures (e#o#x>8 nm). Apres avoir presente la methode experimentale que nous avons etablie pour obtenir des profils de concentration, nous montrons qu'avec cet outil de caracterisation, il est possible de: detecter l'azote dans une matrice de silice, avec une limite de detection de
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43

Ruterana, Pierre. "Structure des interfaces, etude par microscopie electronique en transmission, application : materiaux semiconduteurs iii-v et multicouches pour optiques dans le domaine des rayons x mous." Caen, 1987. http://www.theses.fr/1987CAEN2032.

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Nous avons surtout utilise le mode "haute resolution" sur un microscope a 200kv. La resolution obtenue etait de 2. 4 a. La technique de peparation d'echantillons que nous avons mise au point pour l'etude du procede de passivation (si::(3)n::(4)/gaas) nous a permis de caracteriser dans de tres bonnes conditions les multicouches pour rayons x mous et les heterostructures de croissance epitaxiale. Ce travail fut un suivi des procedes en conjugaison avec d'autres techniques de caracterisation. La comparaison des resultats de ces diverses techniques nous a permis d'apprehender la chimie et la physi
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44

Caignaert, Vincent. "Non-stoechiometrie par creation de lacunes anioniques : oxydes mixtes de manganese et de fer, de structure apparentee a la perovskite." Caen, 1986. http://www.theses.fr/1986CAEN2007.

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Etude des possibilites d'ecarts a la stoechiometrie sur le sous reseau anionique des perovskites amn::(1-x) fe::(x)o::(3-y) (a=ca, sr, ba) par diffraction x et neutron, microscopie electronique haute resolution, spectre moessbauer et mesures magnetiques. Caracterisation de plusieurs types d'ordre des lacunes oxygene en fonction du cation a et du taux de mn
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45

Latroche, Michel. "Caracterisations physico-chimiques des bronzes de titane en relation avec leur stoechiometrie." Nantes, 1988. http://www.theses.fr/1988NANT2019.

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Ces bronzes de titane de type hollandite sont des composes a vfalence mixte de formule generale a::(x)tio::(2), avec a=k, rb, cs et 0,125 <x<0,25. Proposition de differentes voies de synthese. Le caractere de valence mixte est mis en evidence par des etudes physiques (magnetisme, rpe, esca, conductivite). Etudes de diffractions rx et electronique, ainsi que de microscopie electronique en transmission a haute resolution, et mise en evidence de differents types d'ordre dans les cristaux. La mise en oeuvre de la chimie douce d'oxydoreduction permet d'obtenir des monocristaux de bronze partielleme
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46

D'Alfonso, Adrian John. "Atomic resolution imaging in two and three dimensions." 2010. http://repository.unimelb.edu.au/10187/7095.

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This thesis explores theoretical aspects of scanning transmission electron microscopy (STEM) and the comparison of simulation with experiment.<br>The long standing contrast mismatch problem between theory and experiment in conventional high resolution transmission electron microscopy (HRTEM) is examined using the principle of reciprocity and bright field scanning transmission electron microscopy (BFSTEM). It is found that quantitative agreement between theoretical and experimental images is possible provided that theory suitably accounts for the spatial incoherence of the source, and that expe
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47

Rajagopalan, Srivaramangai. "Effect of imaging conditions for reliable measurement of local strain from synthetic High Resolution Transmission Electron Microscope (HRTEM) images by Geometrical Phase Analysis (GPA)." Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-12-586.

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Synthetic HRTEM images are simulated using Jems® simulation software with a model specimen consisting of a film of strained silicon on top of a relaxed Si0.82Ge0.18 alloy substrate in the [110] zone axis, where biaxial tensile strain exists in the strained silicon layer. Two simulated models are created: one with a sudden change in lattice constant (strained Si on a “fat” Si substrate) and another with a sudden change in atomic number (strained Si on a Cl substrate) in order to separate the effects of strain discontinuities from atomic number discontinuities measuring strain using Geometric Ph
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48

Hsieh, Wen-Kuo, and 謝文國. "Studies in Phase Image and Complex High Resolution Transmission Electron Microscopy." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/46195621608619947750.

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博士<br>國立清華大學<br>工程與系統科學系<br>93<br>This thesis examines problems in phase retrieval and resolution improvement in transmission electron microscopy. It begins with the study of phase and the phase problems in microscopy. In this context a number of methods of phase retrieval are introduced and evaluated. The maximum entropy de-convolution method (MEM) is employed to solve the transport of intensity equation (TIE) for phase retrieval problems. . The theoretical basis of this method is presented along with its potential applications in the quantitative phase analysis of porous low-k dielectric mat
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Msane, Gugu. "The synthesis of modified chlorophyll carbon nanotube photoactive dyad systems." Thesis, 2012. http://hdl.handle.net/10210/6361.

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M.Sc.<br>Donor-acceptor (D-A) systems consist of a donor covalently or non-covalently linked to an acceptor. The simplest D–A system consists of a donor linked to an acceptor and is called a dyad system. Photoactive dyad systems are molecular devices designed to perform through the separation of charge separation states and the conversion of solar energy to chemical energy in analogy to photosynthesis.1 These dyad systems consist of a donor which is usually a chromophore and an acceptor. The design of these systems is guided to mimic photo-induced electron transfer (PET) and charge separation
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50

Mueller, Christina. "In Situ Technologies for Structure Determination in the Liquid Phase." Thesis, 2014. http://hdl.handle.net/1807/65708.

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One of the oldest goals across the science is to watch atoms undergo reactions in real time. However, such observations are only meaningful if the object of interest is looked at in its natural environment. For most biological and materials sciences samples, this means in solution phase or dispersed in a liquid. Unfortunately, this restriction normally prohibits either reaching atomic spatial (10-10m) or ultrafast time (10-15sec) resolution. Here, two sample preparation techniques are shown providing a natural environment for experiments with high spatial and temporal resolution: a nanofluidic
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