Needlelike Morphology of Aspartame

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 representa...

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Veröffentlicht in:	Crystal growth & design 2004-09, Vol.4 (5), p.989-997
Hauptverfasser:	Cuppen, H. M, van Eerd, A. R. T, Meekes, H
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Equations of state, phase equilibria, and phase transitions Exact sciences and technology General studies of phase transitions Materials science Methods of crystal growth physics of crystal growth Nucleation Physics Theory and models of crystal growth physics of crystal growth, crystal morphology and orientation
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Beschreibung
Zusammenfassung:	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.
ISSN:	1528-7483 1528-7505
DOI:	10.1021/cg049975b