Sökning: "XAFS"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet XAFS.

  1. 1. Operando X-ray Absorption Spectroscopy Studies of Methane Oxidation Catalysts

    Författare :Johan Nilsson; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; operando spectroscopy; XAS; palladium; heterogeneous catalysis; methane oxidation; XAFS;

    Sammanfattning : Operando spectroscopy is an experimental method in catalysis that combines measurements of catalytic activity and selectivity with simultaneous in situ spectroscopic characterization of the catalyst. Since the structure and composition of the catalyst are probed under reaction conditions, the method can provide valuable information to elucidate the mechanism of the studied reaction. LÄS MER

  2. 2. Electrocatalytic properties of Ni hydroxides with Zn or Co in the Ni matrix

    Författare :Gert Göransson; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Redoxmediated prcesses; pulse plated NiZn; carbon paste electrodes; RRDE; DEMS; XAFS; DEMS;

    Sammanfattning : The majority of the work in this thesis has been made with the improvement of the systems for electrochemical co-generation of chemicals and electricity in mind. This is an appealing but challenging way of producing chemicals with energy as a bi-product, and is commonly referred to as “green chemistry”. LÄS MER

  3. 3. Oligomerization of human and bacterial frataxin : Structural and functional studies

    Författare :Mostafa Abdalkhalik; Biokemi och Strukturbiologi; []
    Nyckelord :Frataxin; Friedreich’s ataxia; iron; reactive oxiden species; protein oligomerization; SAXS; EM; cross-linking; XAFS; nano- DSF;

    Sammanfattning : Friedreich’s ataxia (FRDA) is an autosomal recessive neurodegenerative disease caused by defeciency in frataxin, a highly conserved protein central to iron homeostasis in mirochondria. The function of frataxin is related to its capability to bind, store and deliver iron to different biochemical process such as iron-sulfur cluster assembly and heme biosynthesis. LÄS MER

  4. 4. Life of a Photon in X-ray Spectroscopy

    Författare :Jens Uhlig; NanoLund; []

    Sammanfattning : This thesis summarizes the experimental work in which an ultrafastX-ray laser plasma source was combined with variousscalable direct detection schemes to test a novel approach forlab-based time-resolved X-ray absorption spectroscopy. A laserplasma source based on a water jet target was built and commissioned. LÄS MER

  5. 5. Protein Engineering on Azurin. Expression Mutagenesis and Characterisation of Copper Site Mutants

    Författare :B Göran Karlsson; Chalmers University of Technology; []
    Nyckelord :EPR spectroscopy; cassette mutagenesis; optical spectroscopy; amino acid exchange; Escherichia coli; electron transfer; reduction; azurin;

    Sammanfattning : Azurin belongs to a family of small blue copper proteins or cupredoxins which participate in electron transfer processes in plants and bacteria. The type 1 copper site in these proteins is characterised by an intense blue colour, a narrow hyperfine coupling in the EPR signal and, generally, a high reduction potential. LÄS MER