Solid-liquid interfacial energy of dichlorobenzene

Commercial-purity dichlorobenzene was purified using a columnar distillation system. The equilibrated grain boundary groove shapes for purified dichlorobenzene (DCB) were directly observed by using a temperature gradient stage. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient and solid-liquid interfacial energy of purified DCB were determined to be (6.2 ± 0.6) x 10-8 K m and (29.3 ± 4.4) x 10-3 J m-2 with the present numerical model and the Gibbs-Thomson equation, respectively. The grain boundary energy of the DCB phase was determined to be (54.1 ± 9.2) x 10-3 J m-2 from the observed grain boundary grooves. The thermal conductivity ratio of the liquid phase to the solid phase was measured to be 0.94