Sökning: "electron energy-loss spectroscopy"

Visar resultat 21 - 25 av 42 avhandlingar innehållade orden electron energy-loss spectroscopy.

  1. 21. Synthesis and Characterisation of Carbide Derived Carbons

    Författare :Sigita Urbonaite; Gunnar Svensson; Mats Johnsson; Rik Brydson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbide derived carbons; Gas adsorption; EELS; Raman; Porous carbons; Chemistry; Kemi; strukturkemi; Structural Chemistry;

    Sammanfattning : Carbide derived carbons (CDCs) have been synthesised through chlorination of VC, TiC, WC, TaC, NbC, HfC and ZrC at different temperatures. The aim of the investigation was to systematically study changes of structural and adsorption properties depending on the synthesis conditions. LÄS MER

  3. 22. Development of Cermet Microstructures during Sintering and Heat-Treatment

    Författare :Jenni Zachrisson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; APFIM; EELS; cemented carbides; quantitative microanalysis; gradients; N ; TEM; EFTEM; hardmetals; EDX; Ti C; light elements;

    Sammanfattning : The work presented in this thesis is concerned with the microstructure of Ti(C, N) based cermet materials used in cutting tool applications. Several techniques have been used to study the microstructure of cermets, in particular transmission electron micro-scopy in combi-na-tion with energy dispersive X-ray analysis and electron energy-loss spectroscopy, energy-filtered transmission electron micro-scopy, atom-probe field-ion microscopy and scanning electron microscopy. LÄS MER

  4. 23. Studies of Morphology and Charge-Transfer in Bulk-Heterojunction Polymer Solar Cells

    Författare :Zaifei Ma; Fengling Zhang; Olle Inganäs; Ludvig Edman; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : The work presented in this thesis focuses on the two critical issues of bulk-heterojunction polymer solar cells: morphology of active layers and energy loss during charge transfer process at electron donor/acceptor interfaces. Both issues determine the performance of polymer solar cells through governing exciton dissociation, charge carrier recombination and free charge carrier transport. LÄS MER

  5. 24. Electrochromic Properties of Iridium Oxide Based Thin Films

    Författare :Jonas Backholm; Gunnar A. Niklasson; Andris Azens; Franco Decker; Uppsala universitet; []
    Nyckelord :Engineering physics; Electrochromism; iridium oxide; hydrogen intercalation; chemical diffusion coefficient; density of states; optical modulation; Teknisk fysik;

    Sammanfattning : Electrochromic iridium oxide (IrOx) and iridium-tantalum oxide (IrTaOx) thin films were prepared by reactive magnetron sputtering. Composition, density, and structure were determined using Rutherford backscattering spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and electron energy loss spectroscopy. LÄS MER

  7. 25. Microstructure and Wear of CVD Coatings used in Metal Cutting Applications

    Författare :Andreas Larsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MTCVD; Ca-treated steel; EFTEM; CVD; TEM; Ti C; alfa-Al2O3; gamma-Al2O3; wear; kappa-Al2O3; N ; EELS;

    Sammanfattning : This thesis is concerned with the microstructural characterisation of wear resistant Al2O3 and Ti(C,N)coatings produced by chemical vapour deposition on cemented carbide cutting tools. The investigation focuses on the effect of deposition conditions on the microstructure and the microstructural evolution of the coatings during heat-treatments and metal cutting. LÄS MER