Phase behavior of dodecane–tridecane mixtures confined in SBA-15
Phase behavior of dodecane–tridecane (n-C12H26–C13H28, C12–C13) mixtures in bulk and confined in SBA-15 have been investigated using differential scanning calorimetry. Bulk C12–C13 system has a complicated behavior due to special rotator phase. It has been found that phase diagram of C12–C13/SBA-15 (3.8 nm) system is a straight line, C12–C13/SBA-15 (7.8 nm) a curve, and C12–C13/SBA-15 (8.9, and 17.2 nm) a loop line. The growth of the phase diagram shows size effect on phase behavior of C12–C13 mixtures. Moreover, in the range of 3.8–17.2 nm melting temperatures of pure C12 and mixtures at mole fractions x
 C13 = 0.1–0.5 have linear relation with inverse pore diameter, while C13 and mixtures at x
 C13 = 0.6–0.9 present curved lines. The confined mixtures show a similar melting behavior with pure C12, C13.