Sökning: "porous oxides"

Visar resultat 11 - 15 av 35 avhandlingar innehållade orden porous oxides.

  1. 11. Modelling of reactive gas transport

    Författare :Erik Sundelöf; KTH; []
    Nyckelord :;

    Sammanfattning : A rather general microscopic model for reactive gastransport in porous media is developed and applied to twodifferent processes in powder metal technology: carburization,and reduction of surface oxides.The carburization model is developed from the kinetic modelproposed by Grabke and applied to a 2-D porous geometryobtained from images. LÄS MER

  3. 12. Hot isostatic pressing of ceramics and influence of glass encapsulation

    Författare :Anna-Karin Westman; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Konstruktionsmaterial; Engineering Materials;

    Sammanfattning : Hot isostatic pressing (HIP) is one of the industrial techniques for production of structural ceramics. A high quality of the as-HIPed surface is highly desirable, as it may make it possible to minimise or eliminate costly finishing machining. LÄS MER

  4. 13. Protective and Nanoporous Alumina Films Studied in situ by X-ray and Electrochemical Methods

    Författare :Jonas Evertsson; NanoLund: Centre for Nanoscience; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; XRR; XPS; XRF; GTSAXS; EIS; Synchrotron Radiation; Native oxide; Anodization; Anodic aluminum oxide; Nanoporous aluminum oxide; Single crystal; Aluminum alloys; in situ; Fysicumarkivet A:2018:Evertsson;

    Sammanfattning : In this thesis, the studies of native and anodic oxides on both aluminum model single crystal surfaces as well as on aluminum alloys found in applications are presented. The focus has been on the characterization in situ as the oxide is growing by an electrochemical process called anodization. LÄS MER

  5. 14. First principles study of oxide semiconductors for solar energy applications

    Författare :Maofeng Dou; Clas Persson; Huda Muhammad N.; Sergey Simak; Anna Delin; Peter Johansson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; photocatalysis; water splitting; oxynitrides; dielectric function; first-principles calculation; density functional theory; electronic structures; Casimir interaction; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : The objectives of this thesis are to understand the electronic structures of oxides and oxynitrides for photocatalytic water splitting, examine the Casimir interaction between oxides, and explore possible approach to bridge the Casimir force and material properties for advanced material research. The studies were performed in the framework of the density functional theory, many-body perturbation theory, i. LÄS MER

  7. 15. Preparation of New Catalytic Materials by Small Particle Technology

    Författare :Anders Törncrona; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : New techniques for preparation of catalytic materials with novel properties are presented in this thesis. Three new catalytic materials; washcoated fibres, highly dispersed metal oxides on titania coated silica particles and discrete colloidal ZSM-5 crystals with a low SiO2/Al2O3 ratio have been prepared and characterised. LÄS MER