Abstract
The step energy of the {110} faces of n-paraffin crystals grown from
various solutions is measured in thermal roughening experiments, and the
values are
compared with those calculated using a self-consistent field (SCF)
lattice model calculation technique. The results turn out to be in good
agreement. The interfacial fluid structure of n-paraffin crystals in various
solutions is further examined on a molecular scale by means of SCF calculations.
It is found that the interfacial
structure of the solid–fluid interface of n-alkane crystals changed
substantially, depending on the molecular structure and properties of the
solvent. Subsequently, a ternary system, i.e., the n-C25H52–butanol-n-hexane
solution, is analyzed. It follows that when the segmental density of the
solute is kept constant, mixing a small amount of one solvent with another
may lead to an increase in the step energy. Finally, the solvent-dependent
critical behavior of the roughening transition for
n-alkane crystals grown from various solutions is also discussed. ©1995
American Institute of Physics.