Needlelike morphology of aspartame
Cuppen HM, van
Eerd ART, Meekes H
Cryst. Growth & Design 4, 5 (2004) 989-997
Abstract:
The needlelike morphology of aspartame form II-A is studied by means of
Monte Carlo simulations. Growth simulations for all F faces show merely
three faces with a nucleation barrier for growth: two side faces and
one top face. Calculations of the energies involved in the growth for a
few representative faces are in good agreement with these observations.
For two of these faces, nuclei or steps could be formed without any
energy cost. The simulations explain the needle shape of aspartame
crystals and also the high supersaturation needed to nucleate the
crystals.