1. Ph.D. Candidate, Fuels and Lubricants Technology Laboratory, School of Chemical Engineering, National Technical Univ. of Athens, 5 Iroon Polytechniou St., Athens, GR 15780, Greece.
2. M.Sc. Candidate, Fuels and Lubricants Technology Laboratory, School of Chemical Engineering, National Technical Univ. of Athens, 5 Iroon Polytechniou St., Athens, GR 15780, Greece
3. Associate Professor, Fuels and Lubricants Technology Laboratory, School of Chemical Engineering, National Technical Univ. of Athens, 9 Iroon Polytechniou St., Athens, GR 15780, Greece (corresponding author).