PHASE-SEPARATION IN NONEQUILIBRIUM CONDITIONS INVOLVING STRONG THERMAL CONSTRAINTS AND LARGE ASPECT RATIOS

Phase separation experiments in nonequilibrium conditions (under a tem perature gradient) are reported for nitrobenzene-alkane systems with a n upper consolute point. Two stable phases are observed in every case provided that a cold temperature point exists below the critical tempe rature, whatever the hot temperature may be. For the nitrobenzene-deca ne system, temperatures up to 140 degrees C are considered while for n itrobenzene-hexane, aspect ratios, length to height, up to 60 are inve stigated. At the higher temperature difference, tilted liquid-liquid i nterfaces are observed.