標題: Control of Crystal Polymorph of Glycine by Photon Pressure of a Focused Continuous Wave Near-Infrared Laser Beam
作者: Rungsimanon, Thitiporn
Yuyama, Ken-ichi
Sugiyama, Teruki
Masuhara, Hiroshi
Tohnai, Norimitsu
Miyata, Mikiji
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
公開日期: 4-Feb-2010
摘要: Crystal polymorph of glycine is controlled by tuning the power of a linearly polarized continuous wave 1064-nm laser beam. Upon focusing the beam to the air/solution interface of a supersaturated glycine/D(2)O solution, it single crystal is spatiotemporally formed at a focal spot within a few seconds to a few ten of seconds. Fourier transform infrared measurement and single-crystal X-ray crystallographic analysis of the fabricated single crystal reveal that two polymorphs of alpha- and gamma-forms are prepared depending on the laser power. The probability of gamma-form are prepared depending on the laser power. The probability of gamma-form preparation, which is not available under ambient conditions arises upto 50% at 1.3 W laser power after an objective lens. The mechanism of the polymorph control is discussed in view of both photon pressure and local temperature elevation due to laser irradiation at the focal spot.
URI: http://dx.doi.org/10.1021/jz900370x
http://hdl.handle.net/11536/5852
ISSN: 1948-7185
DOI: 10.1021/jz900370x
期刊: JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume: 1
Issue: 3
起始頁: 599
結束頁: 603
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