Avancerad sökning

Visar resultat 16 - 20 av 32 avhandlingar som matchar ovanstående sökkriterier.

  1. 16. Investigating polymorphism in small molecules using three-dimensional electron diffraction

    Författare :Molly Lightowler; Xiaodong Zou; Hosea M. Nelson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; 3D electron diffraction; structure determination; polymorphism; crystallisation; phase identification; small molecule; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : For scientific, regulatory and intellectual property reasons, the discovery and characterisation of polymorphic systems is an integral aspect of the development process of any solid-formulated drug product. Yet, these studies are often hindered by crystal quality and size, poor yields and the generation of mixtures of phases. LÄS MER

  3. 17. Inorganic and Metal-Organic Framework Materials : Synthesis and structure characterization

    Författare :Leifeng Liu; Junliang Sun; Xiaodong Zou; Russell Edward Morris; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; X-ray diffraction; transmission electron microscopy; framework materials; porous materials; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : Inorganic and metal-organic framework materials possessing accessible and permanent pores are receiving tremendous attention. Among them, zeolites are the most famous class due to their wide applications on petrochemistry and gas separation. LÄS MER

  4. 18. Exploiting reciprocal space : Electron diffraction, textures and precession

    Författare :Peter Oleynikov; Sven Hovmöller; Xiaodong Zou; Jean-Paul Morniroli; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electron crystallography; electron diffraction; texture patterns; precession electron diffraction; Inorganic chemistry; Oorganisk kemi;

    Sammanfattning : Electron crystallography emerges as a new tool for accurate structure determination of very small crystals. In order to exploit the full potential of electron diffraction, the methods for data acquisition and processing have to be developed towards the high standards of X-ray crystallography. LÄS MER

  5. 19. Al-based Thin Film Quasicrystals and Approximants

    Författare :Simon Olsson; Fredrik Eriksson; Lars Hultman; Jensen Jens; Xiaodong Zou; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : In this work, Al-based quasicrystalline and approximant phases have been synthesized in thin films using magnetron sputter deposition. Quasicrystals are structures having long-range order and rotational symmetries which are inconsistent with periodicity. LÄS MER

  7. 20. Approximant Phases in Quasicrystalline AlCuFe Thin Films

    Författare :Simon Olsson; Lars Hultman; Jens Birch; Fredrik Eriksson; Xiaodong Zou; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : Quasicrystalline materials exhibit properties that are very different from conventional metallic materials. They are mostly metallic alloys, and show high hardness and stiffness but low electrical and thermal conductivity. The coefficient of friction and surface energy of the quasicrystalline materials are also very low. LÄS MER