Videomicroscopic Observation of Nonequilibrium Growth Patterns of Crystals

Chung‐Hsien ‐H Tsai, Tze‐Jeng ‐J Hsu, Chung‐Yuan ‐Y Mou

研究成果: 雜誌貢獻文章同行評審

摘要

We have developed a video‐microscopic computer imaging system for observing meso‐scale nonequilibrium physicochemical structures. Chargcd‐coupled device (CCD) in optical detection, and computer‐enhancement of digitized image, have greatly improved the resolution, sensitivity, and dynamical range of this technique. We apply this system to the observation of various complex crystallization patterns from Suberic acid melts and Camphene condensation. These patterns are of the scale one to 100 micrometers. They are resulted from nonlinear dynamical instabilities of a growing crystal fronts. The following patterns are observed: dendrites, destabilization of flat surface, cellular solidification, tip‐splitting, and dense branches. A computer simulation based on diffusion‐limited aggregates (DLA) model is performed to show this instability. The DLA model with surface tension effect is able to result in fractal‐like, dendrite, and needle‐like growth pattern.

原文英語
頁(從 - 到)163-171
頁數9
期刊Journal of the Chinese Chemical Society
37
發行號2
DOIs
出版狀態已發佈 - 4月 1990
對外發佈

ASJC Scopus subject areas

  • 化學 (全部)

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