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Title: Precise habit modification of polar DL-alanine crystal by control of supersaturation
Authors: Han, G.
Chow, P.S.
Tan, R.B.H. 
Issue Date: 7-Sep-2011
Citation: Han, G., Chow, P.S., Tan, R.B.H. (2011-09-07). Precise habit modification of polar DL-alanine crystal by control of supersaturation. Crystal Growth and Design 11 (9) : 3941-3946. ScholarBank@NUS Repository.
Abstract: It has long been reported that a dl-alanine crystal grows considerably faster from its flat -c end than from its pointed +c end, showing typical unidirectional growth from the -c direction and exhibiting a polar needlelike habit. Surprisingly, our new experimental results reveal that the normally slow-growing hemihedral faces at the pointed +c end can undergo fast growth at high supersaturations, contrary to the postulation of the "relay" mechanism. At the same time, a new (001) face at the +c end develops, causing the initially pointed +c end to become flat and leading to a habit modification from needlelike to rodlike with an increase of supersaturation. Furthermore, both the flat (001) face at the +c end and the (001̄) face at the -c end can grow equally fast, and hence, the usually observed unidirectional growth from the -c direction does not hold any more. These new observations are discussed and rationalized. © 2011 American Chemical Society.
Source Title: Crystal Growth and Design
ISSN: 15287483
Appears in Collections:Staff Publications

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