Browsing by Author "Doolan, KR"

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    An in situ rapid heat-quench cell for small-angle neutron scattering
    (Institute of Physics, 2008-06) Pullen, SA; Gilbert, EP; Olsen, SR; Lang, EA; Doolan, KR
    A dual-temperature sample environment has been developed enabling the rapid heating and quenching of samples in situ for small-angle neutron scattering (SANS). The rapid heat and quench cell (RHQC) allows samples to be rapidly heated up to 600 K and then quenched to 150 K, or vice versa, in a single shot or cycle mode, with the sample in position for data collection. Measured cooling rates of up to 11 K s-1 and heating rates up to 19 K s-1 have been recorded during the testing stages. First results using the RHQC on a hydrogenated/deuterated paraffin blend quenched from the melt illustrate the value of the device in accessing the early stage phase separation kinetics with SANS. © 2008, Institute of Physics
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    Modification of surface and barrier properties of polyethylene terepthalate and polycarbonate plastics by ion implantation
    (Australian Institute of Physics, 2005-02-04) Doolan, KR; Evans, PJ; Short, KT
    PET is used to produce a wide range of packaging for foods and beverages. Because oxygen can diffuse through it[1, 2, 3], PET is not suitable for fabrication of bottles for the storage of beer and red wine which are both degraded by oxygen. To store oxygen degradable foods for extended periods of time in PET packaging, oxygen diffusion through the PET must be prevented by incorporating a barrier layer or barrier polymer[1] into the PET matrix. We have begun a study of diffusion of light gases through samples of PET film that have been ion-implanted with aluminium and silicon ions to determine how dose level of these ions affects diffusion rate of helium and other gases through PET film. Polycarbonate (PC) is used to produce plastic products that have high toughness, high optical clarity and good resistance to UV degradation. However, PC sheet scratches easily because it is relatively soft. If PC sheet can be surface hardened to achieve scratch resistance similar to that of Perspex, it could be used to replace products, such as aircraft windows, currently fabricated from Perspex with tougher products fabricated from PC. Ion-implantation is one method that can be used to increase surface hardness and decrease surface wear rate [4]. © 2005 Australian Institute of Physics.