Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces of dl-Alanine Crystal

The effects of various anions and cations dissociated from a spectrum of inorganic salts on the growth of dl-alanine polar c-axis have been systematically investigated using in situ microscopic observations on single seed crystals. Surprisingly, it is observed that both the polar −c and +c ends of d...

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Veröffentlicht in:Crystal growth & design 2012-11, Vol.12 (11), p.5555-5560
Hauptverfasser: Han, Guangjun, Chow, Pui Shan, Tan, Reginald B. H
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creator Han, Guangjun
Chow, Pui Shan
Tan, Reginald B. H
description The effects of various anions and cations dissociated from a spectrum of inorganic salts on the growth of dl-alanine polar c-axis have been systematically investigated using in situ microscopic observations on single seed crystals. Surprisingly, it is observed that both the polar −c and +c ends of dl-alanine c-axis undergo a revival of solvent-poisoned dead growth in the presence of every one of the additives used in this study. Furthermore, it is found that divalent ions (e.g., Mg2+ and SO4 2–) promote the growth along dl-alanine c-axis more effectively than univalent ions (e.g., Na+ and Cl–). Such an ion-induced growth acceleration of dl-alanine c-axis, contrary to the usual understanding, particularly shows an unusual case where important Coulombic interaction between additive and crystal surface can actually favor face growth. This interesting phenomenon is interpreted at the molecular level, with the role of surface roughening particularly highlighted.
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subjects Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of crystal growth
physics of crystal growth
Physics
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
title Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces of dl-Alanine Crystal
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