Sökning: "size-dependence"

Visar resultat 1 - 5 av 29 avhandlingar innehållade ordet size-dependence.

  1. 1. Free Metal Clusters Studied by Photoelectron Spectroscopy

    Författare :Tomas Andersson; Olle Björneholm; Maxim Tchaplyguine; Paolo Piseri; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; clusters; nanoparticles; electronic structure; photoelectron spectroscopy; synchrotron radiation; surface segregation; nanoalloys; size-dependence; metallicity; plasmons; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Clusters are aggregates of a finite number of atoms or molecules. In the present work, free clusters out of metallic parent materials have been created and studied by synchrotron radiation-based photoelectron spectroscopy. The clusters have been formed and studied in a beam and the electronic structure of the clusters has been investigated. LÄS MER

  2. 2. Mechanistic studies of localized corrosion of Al alloys by high resolution in-situ and ex-situ probing techniques

    Författare :Ali Davoodi; Jinshan Pan; Gerald S. Frankel; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; localized corrosion; pitting; aluminum alloy; intermetallic particle; Volta potential; cathodic activity; micro-galvanic effect; size dependence; SKPFM; in-situ AFM; integrated AFM SECM; numerical simulation; micrometer resolution; EIS.; Chemistry; Kemi;

    Sammanfattning : A multi-analytical approach based on in-situ and ex-situ local probing techniques was employed to investigate localized corrosion mechanisms of some aluminum alloys in chloride containing solutions, focusing on the influence of intermetallic particles (IMPs) in the alloys. In the EN AW-3003 alloy, SEM-EDS analysis revealed constituent and dispersoid IMPs. LÄS MER

  3. 3. Characterization of supported lipid membranes towards the development of nano-sized drug carriers for hyperthermia applications

    Författare :Yujia Jing; Chalmers University of Technology; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; size dependence; Supported lipid membrane; lipid phase transition; flip-flop; asymmetry;

    Sammanfattning : So called thermosensitive liposomal drug carriers for temperature-controlled drug release under hyperthermal conditions have recently attracted great attention and advanced lipid membrane - nanoparticle assemblies are emerging at an increasing rate to meet the demands for multifunctional drug carriers in medicine. The rational design of these drug delivery systems will require understanding of lipid membrane physicochemical properties under conditions relevant to the medical treatment. LÄS MER

  4. 4. Deformation and Fatigue Behaviour of Porous and Dense Austenitic Stainless Steel

    Författare :Ulf Lindstedt; Chalmers University of Technology; []
    Nyckelord :mechanical properties; austenitic stainless steel; PM steel; nitrogen; small cracks; previous particle boundaries; microplasticity; grain size dependence; fatigue; porosity;

    Sammanfattning : PM stainless steels are increasing in use and are expected to do so in the future. A lot of work has been carried out concerning production and sintering of stainless steel powders and on the resulting corrosion behaviour. The deformation behaviour of these materials is less studied. LÄS MER

  5. 5. Computational modeling of polycrystals using gradient crystal plasticity

    Författare :Mikkel Grymer; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; parallel algorithms; crystal plasticity; dual mixed finite element method; gradient hardening; grain modeling;

    Sammanfattning : This thesis treats the modeling of grain size dependence inmicrostructure models of metals. It is shown how gradient hardening, in a thermodynamically consistent fashion, can be included into a crystal plasticity model, which is used as the constitutive model in each grain of the polycrystal. LÄS MER