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Submitted on: 25 February 2015.
Revised on: 30 April 2015.
Accepted on: 04 June 2015.
___________________Journal of Nanotechnology---HINDAWI LTD
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Submitted on: 31 March 2010.
Revised on: 28 May 2010.
Accepted on: 22 July 2010.
___________________Journal of Nanotechnology---HINDAWI LTD
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