Submitted on: 16 June 2004.
Revised on: 04 August 2004.
Accepted on: 29 August 2004.
___________________Colloid and Interface Science Communications
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Submitted on: 17 February 2000.
Revised on: 27 April 2000.
Accepted on: 28 May 2000.
___________________Colloid and Interface Science Communications
Submitted on: 02 April 2005.
Revised on: 18 June 2005.
Accepted on: 28 July 2005.
___________________Colloid and Interface Science Communications