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James H. Johnston,James E. Grindrod,Margaret Dodds,Katrin Schimitschek 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
A new nano-structured calcium silicate (NCS) phase change composite material has been developed to provide eective thermalbuering for paperboard packages during the transport and temporary storage of chilled perishable food from the supplier to the market.volume and liquid absorbency. Alkane phase change materials (PCMs) which absorb and release latent heat energy (. 160190 J g. 1) canbe used in heat storage and release applications as they are non-toxic and their operating temperature range can be tuned by the hydro-carbon chain length. The major practical problem of containing the liquid phase has been overcome here by incorporating the alkanePCM (Rubitherm RT6, melting point 8.C) into the highly porous NCS matrix to a level of about 300 wt% of NCS. A paperboard con-tainer constructed and lined with six bubble wrap ‘‘Post-It’’ bags containing 400 g NCS-300PCM composite provided sucient thermalbuering capacity to maintain the temperature inside the container at 10.C for some 5 h after the outside temperature had increased toabout 23 .The NCS-300PCM composite therefore provides sucient thermal buering to ensure perishable food in a paperboard container remainsbelow 10 .C during transport and temporary storage en route from the supplier to the market.
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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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