Search for dissertations about: "surface structure"

Showing result 11 - 15 of 2025 swedish dissertations containing the words surface structure.

  2. 11. Electronic structure of semiconductor surfaces : reconstructions and surface reactions

    Author : Magnus Björkqvist; KTH; []
    Keywords : ;

    Abstract : .... READ MORE

  4. 12. Electronic Structure of Some Zincblende Semiconductor Surfaces

    Author : Yousef Omar Khazmi; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; CdTe; valence band; InP; tight-binding; core level; superlattice; surface; Green s function; adsorbates; semiconductor; GaAs; photoemission; electronic structure;

    Abstract : The main aim of this thesis is to study and understand the surface electronic structure of compound semiconductors (ex. GaAs, InP, ..etc. READ MORE

  5. 13. The influence of particle properties on cake filtration: Surface structure and surface charge

    Author : Jonas Wetterling; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; surface structure; electrostatic particle interactions; cake filtration; solid-liquid separation; compressible filter cake; local filtration properties;

    Abstract : Solid-liquid separation is often a key process step when biomass is used as a raw material, and an energy efficient way of achieving solid-liquid separation is through cake filtration. However, many biomaterials present challenges when they are filtrated due to the formation of compressible filter cakes. READ MORE

  6. 14. Structure, Morphology, and Catalytic Properties of CuOx/CeO2 Model Catalysts

    Author : Björn Skårman; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Synchrotron radiation; High-energy Diffraction; X-ray Absorption Fine Structure Spectroscopy.; Chemical technology and engineering; Kemiteknik och kemisk teknologi; Chemistry; Kemi; Material technology; Materiallära; materialteknik; X-ray photoelectron spectroscopy; Atomic force microscopy; Gatan Image Filter GIF ; Energy-filtered TEM; High-resolution electron microscopy; Inert gas condensation IGC ; rf Magnetron sputtering; Thermal activation; Batch reactor; Carbon monoxide oxidation; Surface sensitivity; Catalytic anisotropy; Growth; Nucleation; Topography; Roughness; Core-shell structures; Morphology; Nanostructured; Nanocomposite; Nanoparticles; Surface structure; Polycrystalline surfaces; Thin films; Copper oxide; Cerium dioxide CeO2 ; Ceria;

    Abstract : Cerium dioxide, or ceria, is a chemically stable oxygen ion conducting material with a capacity to store and release oxygen, and is therefore extensively used in combustion catalysts. The Cu-Ce-O system has been identified as one of the most active catalysts for the combustion of carbon monoxide. READ MORE

  7. 15. Vibrational Sum Frequency Spectroscopy Studies at the Air-Liquid Interface

    Author : Eric Tyrode; Mark Rutland; Paul Davies; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Sum Frequency Generation; SFG; VSFS; surfactant; adsorption; water; surface structure; hydration; surface tension; fluorosurfactants; liquid-air interface; poly ethylene oxide surfactants; surface molecular orientation; acetic acid.; Surface and colloid chemistry; Yt- och kolloidkemi;

    Abstract : In this thesis the structure and hydration of small organic and amphipilic compounds adsorbed at the air-liquid interface, have been studied using the nonlinear optical technique Vibrational Sum Frequency Spectroscopy (VSFS). The second order nature of the sum frequency process makes this technique particularly surface sensitive and very suitable for interfacial studies, as molecules at the surface can be distinguished even in the presence of a vast excess of the same molecules in the bulk. READ MORE