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Aerosol Nanoparticles Formed during Plasma Deposition
Ždímal, Vladimír ; Moravec, Pavel ; Doležal, B. ; Brožek, Vlastimil ; Neufuss, Karel
Results of pilot-plant experiments on a plasmatron WSPR constructed at the Institute of IPP AS CR are shown in this paper, dealing with plasma deposition of the ultrafine and fine aerosol fractions of some metallic materials. In this work we concentrated on its side-product investigating the ultrafine particles released during the process into the aerosol phase. The aerosol particle size distribution was studied in a near real time using the state-of-the-art aerosol spectrometers operated by the ICPF AS CR. It was verified that these instruments are able to take aerosol samples in the close vicinity of a high-temperature plasma and still provide sensible results. In the present work we discussed the possibility to produce aerosol nanoparticles of a defined composition and properties by the plasmatron technique.
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Total Oxidation of Organic Compounds in Air over Oxide Catalysts
Ludvíková, Jana ; Jirátová, Květa ; Kovanda, F. ; Klempa, Jan
The aim of this work was investigation of the influence of various combinations of metals, Cu, Co, Ni, Mn or Al on properties of LDH (layered double hydroxides)-precursors and their calcined forms, examination of formation of these layered double hydroxides on a model support (anodized aluminum foil), and determination of catalytic activity of the calcined precursors in oxidation of ethanol as model compound.
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Extraction of Tall Soap by Use of Selected Organic Solvents
Rousková, Milena ; Heyberger, Aleš
The aim of this study was to compare yields of phytosterols by use of liquid-liquid-extraction when several extraction solvents, recommended in literature sources, were used. Hexane, limonene, isobutanol, methyl isobutyl ketone and methyl tert-butyl ether were tested. These solvents differ in polarity. Largest yields of total phytosterols (67%) and especially of the beta sitosterol (89%) were reached when isobutanol was used. Disadvantages of most of the tested solvents were formation of the undesirable solid interphase, which could not be removed, their partial solubility in water phase and/or their high boiling point.
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