Anisotropic Growth Kinetics and Pattern Formation of Ice

冰的各向异性生长动力学和图案形成

• 批准号: 10044049
• 负责人: FURUKAWA Yoshinori
• 金额: $ 3.58万
• 依托单位: Institute of Low Temperature Science, Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044049/
• 关键词: Pattern formation; Ice crystal; Morphological instability; Diffusion field; Mullins-Sekerka instability; Interferometry; Molecular dynamics simulation; 計算機シュミレーション; 表面融解; 結晶成長; 界面カイネティクス; パターン形成; 樹枝状成長; ファセット成長; 界面張力; 異方性; 計算機シミュレーション

Pattern formation mechanisms of ice crystals with the faceted faces were carried out in cooperation with the researchers of Carnegie-Mellon Univ. Pittsburgh.First of all, pattern formation of ice crystal interface during the one-directional growth was observed in-situ using a Mach-Zehnde interferometer. A direct evidence for the constitutional supercooling, which develops in front of the interface, was first given from the analysis of diffusion field of impurity using the interference fringes. The Mullins-Sekerka instability theory, which is basically a linear and steady state theory, is also applicable to the pattern formation of ice interface.Second, a new model for the ice disk growth of ice in the supercooled water was also developed on the basis of the experimental results for ice crystal growth.As a result, we showed that there are two different modes for ice crystal processes in the supercooled water depending on the growth kinetics of basal faces (namely, the spiral growth or the two-dimensional nucleation growth of basal faces). This result gives the new prospect for the understanding of the pattern formation of crystals with faceted faces.Third, the molecular dynamics simulations were .also carried out for the ice surfaces and the ice-water interfaces. The physical properties of quasi-liquid layers on the ice surfaces and the growth processes of ice crystals from the supercooled water were precisely discussed in the molecular level. Most important argument was that we showed the anisotropic growth modes between basal and prismatic interfaces of ice. We begin to develop a new model for the pattern formation of ice crystal on the basis of these results obtained in the period of this international project. Related symposiums about the pattern formation of crystals with faceted faces were also held in Sapporo twice during the project periods. More than 50 researchers were participated for both.

本文与匹兹堡大学的研究人员合作，研究了具有小平面的冰晶的图形形成机制。首先，利用马赫-曾德干涉仪对冰晶单向生长过程中的界面图形形成进行了原位观察。利用干涉条纹对杂质扩散场的分析，首次给出了界面前沿成分过冷的直接证据。Mullins-Sekerka不稳定性理论基本上是一种线性的定态理论，它也适用于冰界面图形的形成。其次，在冰晶生长实验结果的基础上，建立了一个新的过冷水中冰的冰盘生长模型，结果表明，结果表明，在过冷水中，根据基面生长动力学的不同，存在两种不同的冰晶过程模式（即，螺旋生长或基面的二维成核生长）。这一结果为了解具有小切面的晶体的图案形成提供了新的前景。第三，对冰表面和冰水界面进行了分子动力学模拟。在分子水平上精确地讨论了冰面上准液体层的物理性质和过冷水中冰晶的生长过程。最重要的论点是，我们显示了各向异性的增长模式之间的基础和棱柱形界面的冰。我们开始发展一个新的模式的冰晶图案形成的基础上，在这个国际项目期间获得的这些结果。在项目期间，还在札幌召开了两次关于多面晶体图案形成的相关研讨会。50多名研究人员参与了这两项工作。

项目成果

Y. Furukawa: "Recent developments on researches of ice crystal growth ( in Japanese )."Reitou. 74. 55-61 (1999)

Y. Furukawa：“冰晶生长研究的最新进展（日语）”Reitou。

E. Yokoyama, R. F. Sekerka and Y. Furukawa: "Growth trajectories of disk crystals of ice growing from supercooled water."J. Phys. Chem.. B104. 65-67 (2000)

E. Yokoyama、R. F. Sekerka 和 Y. Furukawa：“从过冷水中生长的冰盘晶体的生长轨迹”。

H. Nada and Y. Furukawa: "Anisotropy in structural transitions between basal and prismatic interfaces of ice studied by molecular dynamics simulation."Surface Science. 446. 1-16 (2000)

H. Nada 和 Y. Furukawa：“通过分子动力学模拟研究冰基底和棱柱界面之间结构转变的各向异性。”表面科学。

Etsuro YOKOYAMA,Koichi OKADA and Katsuo TSUKAMOTO: "PRECISE VISUALIZATION OF THE NON-STEADY STATE CONCENTRATION FIELD AROUND A GROWING CRYSTAL IN SOLUTION" Forma. (印刷中). (1999)

Etsuro YOKOYAMA、Koichi OKADA 和 Katsuo Tsukamoto：“溶液中生长晶体周围非稳态浓度场的精确可视化”Forma（1999 年出版）。

H.Nada and Y.Furukawa: "Anisotropy in structural transitions between. basal and prismatic interfaces of ice studied by molecular dynamics simulation"Surface Science. 446. 1-16 (2000)

H.Nada 和 Y.Furukawa：“通过分子动力学模拟研究冰的基底和棱柱界面之间结构转变的各向异性”表面科学。