Nucleation in Liquid Sulfur Droplets
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概要
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The freezing behavior of supercooled liquid sulfur droplets were studied by means of a microscopic method. The number fraction of the solidified droplets in the experiments of continuous cooling on well-purified sulfur was only about 15% over the temperature range from 120°C to −70°C at the cooling rate of 0.20°C/min, and no abruptly discontinuous nucleation was found in these supercooling temperatures. The number fractions of the solidified droplets were found to be related to their volumes below −20°C. The nucleations in the well-purified liquid surfur droplets were confirmed to be a homogeneous process under these conditions. The specific nucleation rates per unit of volume were estimated to be 0.450, 1.13, and 1.16 cm<SUP>−3</SUP>sec<SUP>−1</SUP> at the specified temperatures of −20, −40, and −50°C respectively. The dependences of (ln<I>I</I>+<I>ΔF<SUB>A</SUB></I>⁄<B>k</B><I>T</I>) on 1⁄(<I>ΔT</I>)<SUP>2</SUP><I>T</I> obeyed the theory of Turnbull and Fisher. The interfacial free energy of sulfur at the liquid-crystal surface was estimated to be 12.1 erg/cm<SUP>2</SUP>; this value was considered to be an appropriate one according to the Zadumkin consideration.
- 公益社団法人 日本化学会の論文
著者
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Hamada Shuichi
Department Of Applied Chemistry Faculty Of Science And Institute Of Colloid And Surface Chemistry Sc
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Hamada Shuichi
Department of Chemistry, Faculty of Science, Science University of Tokyo
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Shirai Toshiaki
Department of Chemistry, Faculty of Science, Science University of Tokyo
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Nakazawa Yoshihiro
Department of Chemistry, Faculty of Science, Science University of Tokyo
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