Browsing by Author "Noorman, J"

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    Apiezon L-type grease coating of 8-µm Nuclepore Polycarbonate coarse filters used in GENT aerosol sampling units
    (Australian Nuclear Science and Technology Organisation, 2006-04) Stelcer, E; Noorman, J; Button, D; Hawas, O; Cohen, DD
    Coarse stage Nuclepore filters used in GENT aerosol sampling units were coated with a thin film of Apiezon L-type grease in order to minimise the loss of particles on the filters due to 'bounce off'. Originally Freon was used as the solvent to dissolve the Apiezon grease in the coating process. Because of the environmental impact, Freon was discontinued and replaced with Fluorinert. Apiezon grease did not dissolve freely in the Fluorinert and it was replaced by Fomblin grease in 1995. This increased production costs and coated Nuclepore coarse filters ceased production in 2004. Users were concerned that their stocks of coated Nuclepore filters were diminishing and as no alternative supply was available the feasibility of coating the coarse filters in house needed to be investigated. This report describes experiments conducted at ANSTO and the results obtained during the investigation of the coating process under laboratory conditions. Apiezon grease and Toluene were used in this process. Experiments were based on the procedure proposed by Prof P. Hopke and Dr A. Markwitz [1] with modification to this technique to increase the uniformity of the grease layer across the filter surface and to achieve approximately 100 µg of Apiezon grease per filter.
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    Morphology of composite particles of single wall carbon nanotubes/biodegradable polyhydroxyalkanoates prepared by spray drying
    (Springer, 2010-01) Yun, SI; Lo, V; Noorman, J; Davis, J; Russell, RA; Holden, PJ; Gadd, GE
    Spray drying was investigated as a strategy for producing single wall carbon nanotube (SWCNT)/polymer composites. The spray-drying method produced SWCNT/poly(3-hydroxybutyrate) and SWCNT/poly(3-hydroxyoctanoate) composite particles in which the SWCNTs have been trapped in a well-dispersed state throughout the polymer matrix. Increasing SWCNT content in the composite led to a change in particle morphology from spherical and smooth to rosette shape with angular distortions. The technique shows potential for bulk carbon composite fabrication. © 2010, Springer.