Sökning: "supercritical fluid"

Visar resultat 16 - 20 av 53 avhandlingar innehållade orden supercritical fluid.

  1. 16. Open-tubular columns for liquid and supercritical fluid chromatography

    Författare :Karel Janák; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical Chemistry; analytisk kemi;

    Sammanfattning : Methods have been developed for the preparation of narrow-bore open tubularcolumns. In this content, condensed gases (butane, chloroethane and Freon114) were used as solvents for the static coating of these columns. Adevice for filling the narrow-bore open tubular columns with solutions incondensed gases has been designed. LÄS MER

  3. 17. Packed capillary columns in liquid and supercritical fluid chromatography

    Författare :Stephan Hoffmann; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  4. 18. Determination of Persistent Organic Pollutants in Solid Environmental Samples Using Accelerated Solvent Extraction and Supercritical Fluid Extraction. Exhaustive extraction and sorption/desorption studies of PCBs

    Författare :Erland Björklund; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sorption; Sediment; PCBs; Polychlorinated Biphenyls; POP; Persistent Organic Pollutants; SFE; Supercritical Fluid Extraction; Accelerated Solvent Extraction; ASE; Desorption; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Human activity is constantly causing environmental problems due to production and release of numerous chemicals. A group of compounds of special concern is persistent organic pollutants (POP). These toxic, lipophilic chemicals have a high chemical and biological stability, and tend to accumulate in the lipid phase of living organisms. LÄS MER

  5. 19. High-Pressure Microfluidics

    Författare :Sam Ogden; Klas Hjort; Greger Thornell; Wouter van der Wijngaart; Uppsala universitet; []
    Nyckelord :phase change; actuator; valve; pump; supercritical fluid; Teknisk fysik med inriktning mot mikrosystemteknik; Engineering Science with specialization in Microsystems Technology;

    Sammanfattning : In this thesis, some fundamentals and possible applications of high-pressure microfluidics have been explored. Furthermore, handling fluids at high pressures has been addressed, specifically by creating and characterizing strong microvalves and pumps.A variety of microstructuring techniques was used to realize these microfluidic devices, e.g. LÄS MER

  7. 20. Foam, Fire and Free Volume - Chemical and Physical Aspects of Porous Polymers

    Författare :Anna Andersson; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Poisson ratio; vibration damping; acoustic impedance; cell morphology; hyperbranched polymer; Polymer foams; free volume; positron annihilation; supercritical fluid.;

    Sammanfattning : Automotive seating has been under continous development since it was described for the first time in 1885. At that time one could read about a “padded leather bench seat sitting on springs mounted directly to the frame of a horse-less carriage”. LÄS MER