Search for dissertations about: "electrospray ES"

Found 5 swedish dissertations containing the words electrospray ES.

  2. 1. Development of Sheathless Electrospray Mass Spectrometry and Investigations of Associated Electrochemical Processes – A Fairy Tale

    Author : Stefan Nilsson; Karin Markides; Leif Nyholm; Jonas Bergquist; Per Andrén; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; electrospray; sheathless; mass spectrometry; capillary electrophoresis; electrochemistry; chromatography; interface; fairy dust; gold; Analytisk kemi; Analytical chemistry; Analytisk kemi;

    Abstract : In microscale separations, such as capillary electrophoresis and -liquid chromatography, the liquid flow rates are in the order of nanoliters per second. If such flow rates are to be interfaced with a mass spectrometer (MS) using electrospray (ES) ionization, without loss of separation efficiency, each fraction of the analyte zone must remain undisturbed by the high voltage contact necessary for ES. READ MORE

  4. 2. On the Electrolyte Induced Aggregation of Concentrated Silica Dispersions - An Experimental Investigation Using the Electrospray Technique

    Author : Ann-Catrin J. H. Johnsson; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Colloidal silica dispersion; aggregation; gelation; electrospray ES ; scanning mobility particle sizer SMPS ; synchrotron radiation small-angle x-ray scattering SR-SAXS ; electron microscopy EM ; dynamic light scattering DLS ; particle morphology; ion specificity; gel layer;

    Abstract : Gels are weak, solid-like structures that arise when colloidal particles aggregate to form a network of particle clusters. A variety of colloidal systems that are important scientifically as well as in industrial applications are capable of gel formation, e.g. globular protein solutions, colloid-polymer mixtures, and metal oxides. READ MORE

  5. 3. Hydrolytic Synthesis and Physicochemical Properties of TiO2 Nanoparticles: Fundamentals and Applications

    Author : Jenny Perez-Holmberg; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Titanium dioxide TiO2 ; Nanoparticles; Synthesis; Hydrolysis; Titanium tetrachloride TiCl4 ; Anatase; Brookite; DLS; ES-SMPS; XRD; Collective diffusion; Interfacial processes;

    Abstract : Titanium dioxide (TiO2) nanoparticles were synthesized via the hydrolysis of TiCl4 in order to produce clean, surfactant-free oxide surfaces. By controlling the synthesis and aging conditions, stable particles with well-defined size distributions were obtained. READ MORE

  6. 4. Nano-electrospray mass spectrometry for the analysis of neurosteroids and related molecules

    Author : Suya Liu; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Neurosteroids are steroids synthesised in the central and peripheral nervous systems. Known neurosteroids include pregnenolone, dehydroepiandrosterone (DHEA), progesterone and its reduced metabolites. READ MORE

  7. 5. A qualitative and quantitative study of nitrotyrosine using mass spectrometry and immunochemistry

    Author : Ann-Sofi Söderling; Göteborgs universitet; []
    Keywords : mass spectrometry; oxidative stress; nitrotyrosine; nitric oxide; protein modification;

    Abstract : Background: Reactive oxygen (ROS), and nitrogen (RNS) species are formed during normal metabolism and in higher concentration in pathological conditions. They may cause cellular damage when the antioxidant defence is unable to balance the production of oxidants. READ MORE