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Determination of the specific surface free energy of natural quartz crystals using measurement of contact angle of liquid droplets

✍ Scribed by T. Suzuki; H. Kasahara

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 186 KB
Volume: 45
Category: Article
ISSN: 0232-1300
DOI: 10.1002/crat.201000308

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✦ Synopsis

Abstract

Contact angle of water and formamide droplets on natural quartz crystals were observed. The specific surface free energy (SSFE) of m, r, and z faces, calculated using the Fowkes approximation, were approximately 54‐69 mN/m. The length of the normal line from the center of the crystal to each face (h~i~) was observed and compared with the SSFE. Though, Wulff's relationship was well satisfied for synthesized crystals, h~i~ was not proportional to SSFE for natural crystal. We propose an idea of “γ center”, which correspond to Wulff's point for ideal equilibrium shape crystal. We concluded that, crystal face with the larger SSFE has larger growth rate even for natural crystal. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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