In the simulation, the TIP4P [24,25] model is applied for the water molecule. The ethanol molecule is considered to be rigid structure which includes four interaction sites(methyl group, methylene group, oxygen atom and hydrogen atom). In the molecular model of ethanol, the bond angles of CH3-CH2-O and CH2-O-H are 108◦ and 108.5◦, respectively.The relevant bond lengths are listed in Table 2.3[2]