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- 저자 : Thomas Borrmann (검색결과 2 건)
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Nano-structured composite calcium silicate and some novel applications
James H. Johnston,Thomas Borrmann,Daniel Rankin,Mathew Cairns,James E. Grindrod,Andrew Mcfarlane 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Composite nano-structured calcium silicate materials have been prepared by reaction of a silica-containing solution with calcium ionsat elevated pH, characterised and tested in metal adsorption and anti-microbial applications. The material comprises nano-size plateletsthat self-assemble into particles of about 15l m in size with an open framework structure. These exhibit a high pore volume and liquidabsorption of about 500600 g oil 100 g. 1 silicate and a high accessible surface area of up to about 600 m2 g. 1trollable in the synthesis process. It has a high whiteness and brightness. XRD shows only short range order. The surface of the nano-sizeplatelets contain both silanol (SiOH) groups and Ca2+ ions which provide bonding sites for the adsorption of metal cations. As such,the nano-structured calcium silicate exhibits an excellent ability to recover metal cations from solutions such as Cu2+ down to the1mgkg. 1 level, demonstrating its potential in environmental clean-up applications. Similarly, silver ions can be adsorbed with the result-ing nano-structured calcium silicatesilver composites showing excellent antimicrobial activity againstStaphylococcus aureus(ATCC25923) down to very low silver levels of 1 mg kg. 1. The silver cannot be leached out easily. These composite particles can be incorporatedinto surface coatings, plastics and food packaging as an easily useable, eective and durable anti-microbial agent.
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Conducting polymer composites with cellulose and protein fibres
James H. Johnston,John Moraes,Thomas Borrmann,David Flynn,Fern M. Kelly 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Conducting polymer–fibre composites with polypyrrole cellulose (paper) and protein (wool) fibres have been produced by polymerizing pyrrole with ferric chloride as the oxidant around separated individual cellulose (wood) fibres from bleached Pinus radiata Kraft pulp, and merino wool fibres respectively to generate new composite materials that retain the inherent properties of the polymer and individual fibres. For the polypyrrole–cellulose composite, the polypyrrole consisted of spheres of about 100 nm in size fused together to form a continuous coating that fully encapsulates the cellulose fibre and associated finer fibrils. For the polypyrrole–wool composite the polypyrrole formed a similar coating of about 200 nm spheres. Electrical conductivities of the composites were substantially increased over those of the precursor fibres.
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