1. Department of Materials Science; University of Patras; GR-26504 Patras Greece
2. Technological Educational Institute of Larisa; Department of Mechanical Engineering, T.E.I. of Larissa; GR-41110 Larissa Greece
3. Laboratory of Pharmaceutical Technology; Department of Pharmaceutical Sciences, Aristotle University of Thessaloniki; GR-54124 Thessaloniki Greece
4. Institute of Chemical Engineering and High Temperature Chemical Processes FORTH; P.O.Box 1414 GR-26504 Patras Greece