Unusual phase behavior of decane-dodecane mixtures confined in SBA-15:Size effect on binary phase diagram

摘要

Phase behavior of normal decane-dodecane(n-C_(10)H_(22)-C_(12)H_(26),C_(10)-C_(12)) system confined in SBA-15(Santa Barbara Amorphous,pore diameters 3.8,7.8,and 17.2 nm) has been studied by using differential scanning calorimetry.It has been found solid-liquid phase diagram of the C_(10)-C_(12)/SBA-15 system is composed of a straight line(3.8 nm),a curve(7.8 nm) and a loop line (17.2 nm).The growth of the phase diagram clearly shows the size effect on phase behavior of binary alkanes.Phase behavior has been compared among the systems C_(10)H_(22)-C_(12)H_(26)/SBA-15,C_(12)H_(26)-C_(14)H_(30)/SBA-15 and C_(14)H_(30)-C_(16)H_(34)/SBA-15.