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  • Materials processing with dense gases
    Knez, Željko ; Novak, Zoran
    Materials processing using dense gases is one of the most attractive uses of SCF today. A newly-developed process PGSS (Particles from Gas saturated Solutions) was used in the generation of powder ... from glycerides. The influence of the process conditions on the particle size, particle size distribution, shape, bulk density and crystallinity is discussed. In the production of transparent and monolithic silica aerogel samples, the drying of alcogel is the most critical step. If the extraction of alcohol with liquid or supercritical carbon dioxide is used, the diffusion of alcohol (or other solvent) through the alcogel to the CO2 plays an important role. From the dependence of the width of the non-transparent damage area on diffusion times, the diffusion coefficients of methanol in the liquid CO2 at two different temperatures and the diffusion coefficient of methanol in supercritical CO2 inside the cylindrical samples of silica aerogel were determined.
    Type of material - conference contribution
    Publish date - 1998
    Language - english
    COBISS.SI-ID - 3548950