Browsing by Author "Thompson, S"
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- ItemEnvironment-induced self-assembly in phase separated block copolymer systems(The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) Dutta, NK; Thompson, S; Choudhury, NR; Knott, RBPolymer chain sequence with different repeating unit and thermodynamic incompatibility between the segments can be chemically linked together through covalent bonds to form block copolymers of unique ordered microstructure and characteristics. Such block copolymers are characterized by fluid-like disorder ion the molecular scale and a high degree of morphological order at longer length scales, resulting in complex equilibrium phase behaviors, giving rise to a large variety of microdomain structures. A specific block copolymer may be optimum nanomaterial, either for their intrinsic properties as self-organized assemblies; or could be used as a strategy to template the organization of the desired inorganic. semi-conducting, metallic or biologically relevant materials into particles, nano planes, wires, or spheres within the polymer matrix. The amphiphilic block copolymers that self-assemble in selective solvents are also of significant scientific interest and of extensive importance in the field of controlled drug delivery systems, detergents, paints, cosmetics, oil recovery.. The situation is versatile and complicated since for a block copolymer system a solvent that is good for one block may be neutral, slightly selective, or strongly selective, or a non-solvent for the other block/ls. in multiblock copolymer with selective solvents the dramatic expansion of parameter space poses both experimental and theoretical challenges; and there has been very limited systematic research on the environment-induced self-organization of the phase behavior of triblock copolymer. ln this research work the effect of selective solvent and temperature on the phase behavior of a polystyrene-b-(ethylene-co-butylene)-b-styrene triblock copolymer (SEBS) are presented. We examine the adaptive nature of the ordering in asymmetric block copolymers, using a small angle neutron scattering techniques (SANS). The effect of solvent selectivity and temperature on the evolution of the scattering pattern and trends of the interference maximum in the lovv q (structure factor related to interdomain interference and indicates relatively higher level of ordering of the micelle cores) and high q regimes (form factor related to the contribution of the smaller intradomain distances) has been monitored. The organizational behavior has also been confirmed using Atomic force microscopy (AFM), transmission electron microscopy (TEM) and rheolgical investigation. Morphological evolution of the self-assembled phase behavior of such polymer with the thermodynamic selectivity of solvent, temperature, heat treatment, and time will been discussed in detail. © The Authors
- ItemEnvironment-induced self-assembly in phase separated block copolymer systems: a SANS investigation(Elsevier B. V., 2006-11-15) Dutta, NK; Thompson, S; Choudhury, NR; Knott, RBIn this research, we examine the effect of non-selective solvent on the large-scale mesoscopic ordering in asymmetric block copolymers, poly(styrene-block-ethylene/butylene-block-styrene) (SEBS) using small angle neutron scattering technique (SANS). SANS measurements were carried out over a wide range of concentrations and temperatures. Evolution of the self-assembled phase morphology in such polymer with the thermodynamic selectivity of solvent, temperature and concentration has been discussed. Correlation between morphology and thermorheological behavior of the gels has also been established. © 2006 Elsevier B.V.
- ItemLower Hunter particle characterisation study 1st progress report(Office of Environment and Heritage and Environment Protection Authority, 2014-07) Hibberd, MF; Keywood, MD; Cohen, DD; Stelcer, E; Scorgie, Y; Thompson, S; Rivett, KThe Lower Hunter Particle Characterisation Study was commissioned by the NSW Environment Protection Authority in 2013 to investigate the composition and major sources of particle pollution in the Lower Hunter. The study was conducted by scientists from the former Office of Environment and Heritage (OEH), CSIRO and the Australian Nuclear Science and Technology Organisation (ANSTO), with oversight from the NSW Ministry of Health, and completed in 2016. Focusing on very small particles, invisible to the human eye, which can be inhaled and can pass through the throat and nose and into the lungs, the study aimed to determine the composition and major sources of fine particles (PM2.5) and coarse particles (PM2.5-10). Fine particles were monitored at four sites, including two sites representative of regional population exposures (Newcastle, Beresfield) and two sites near the Port of Newcastle (Mayfield and Stockton). Coarse particles were monitored at Mayfield and Stockton, the two sites near the Port of Newcastle.
- ItemLower Hunter particle characterisation study 2nd progress report (Winter)(Office of Environment and Heritage and Environment Protection Authority, 2014-10-01) Hibberd, MF; Keywood, MD; Cohen, DD; Stelcer, E; Scoprgie, Y; Thompson, SThe Lower Hunter Particle Characterisation Study was commissioned by the NSW Environment Protection Authority in 2013 to investigate the composition and major sources of particle pollution in the Lower Hunter. The study was conducted by scientists from the former Office of Environment and Heritage (OEH), CSIRO and the Australian Nuclear Science and Technology Organisation (ANSTO), with oversight from the NSW Ministry of Health, and completed in 2016. Focusing on very small particles, invisible to the human eye, which can be inhaled and can pass through the throat and nose and into the lungs, the study aimed to determine the composition and major sources of fine particles (PM2.5) and coarse particles (PM2.5-10). Fine particles were monitored at four sites, including two sites representative of regional population exposures (Newcastle, Beresfield) and two sites near the Port of Newcastle (Mayfield and Stockton). Coarse particles were monitored at Mayfield and Stockton, the two sites near the Port of Newcastle.
- ItemLower Hunter particle characterisation study 3rd progress report (Spring)(Office of Environment and Heritage and Environment Protection Authority, 2015-01-01) Hibberd, MF; Keywood, MD; Cohen, DD; Stelcer, E; Scorgie, Y; Thompson, SThe Lower Hunter Particle Characterisation Study was commissioned by the NSW Environment Protection Authority in 2013 to investigate the composition and major sources of particle pollution in the Lower Hunter. The study was conducted by scientists from the former Office of Environment and Heritage (OEH), CSIRO and the Australian Nuclear Science and Technology Organisation (ANSTO), with oversight from the NSW Ministry of Health, and completed in 2016. Focusing on very small particles, invisible to the human eye, which can be inhaled and can pass through the throat and nose and into the lungs, the study aimed to determine the composition and major sources of fine particles (PM2.5) and coarse particles (PM2.5-10). Fine particles were monitored at four sites, including two sites representative of regional population exposures (Newcastle, Beresfield) and two sites near the Port of Newcastle (Mayfield and Stockton). Coarse particles were monitored at Mayfield and Stockton, the two sites near the Port of Newcastle. © 2015 CSIRO and Office of Environment and Heritage
- ItemLower Hunter particle characterisation study 4th progress report (Summer)(Office of Environment and Heritage and Environment Protection Authority, 2015-04) Hibberd, MF; Keywood, MD; Cohen, DD; Stelcer, E; Scrogie, Y; Thompson, SThe Lower Hunter Particle Characterisation Study was commissioned by the NSW Environment Protection Authority in 2013 to investigate the composition and major sources of particle pollution in the Lower Hunter. The study was conducted by scientists from the former Office of Environment and Heritage (OEH), CSIRO and the Australian Nuclear Science and Technology Organisation (ANSTO), with oversight from the NSW Ministry of Health, and completed in 2016. Focusing on very small particles, invisible to the human eye, which can be inhaled and can pass through the throat and nose and into the lungs, the study aimed to determine the composition and major sources of fine particles (PM2.5) and coarse particles (PM2.5-10). Fine particles were monitored at four sites, including two sites representative of regional population exposures (Newcastle, Beresfield) and two sites near the Port of Newcastle (Mayfield and Stockton). Coarse particles were monitored at Mayfield and Stockton, the two sites near the Port of Newcastle.