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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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