Magnetic field effect on the growth of metal silicate tubes -magnetically induced chiral structure-

磁场对金属硅酸盐管生长的影响-磁感应手性结构-

• 批准号: 16540299
• 负责人: YOKOI Hiroyuki
• 金额: $ 2.11万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540299/
• 关键词: metal silicate tube; magnetic field induced double helix; Lorentz force; magnetic force; osmotic pressure; in-situ obseerbation; chemical garden; anion flow; 磁場誘起ヘリカル構造; 二重らせん; 浮力; 流れの可視化

We have found a novel phenomenon that freestanding metal silicate tube growing from metal salt powders such as FeCl_2 and CoCl_2 immersed in water solution of sodium silicate forms a twisted (chiral or helical) structure. In the growing process of metal silicate tubes, aqueous solution of metal salts is delivered through the tubes and emitted at the growing ends. We have given experimental proofs on that the Lorentz force exerting on anions in the metal salt solution is related to the formation of the helical structure. However, why the Lorents force exerts on anions was unresolved because the flow of the metal salt solution is parallel to applied magnetic field. We have proposed the following model in order to explain the reason : Among ions included in the metal salt solution, metal ions are trapped in metal silicate membranes, while anions are emitted outward and could have a motion component perpendicular to the magnetic field. The Lorentz force would exert on such macroscopic flow of anions and generate vertex, which would twist the tube before the solidification. In order to confirm this model, we have developed an in-situ observation system under magnetic fields. In a gradient field of B=2.2 T and B・dB/dx=46 T^2/m, vortex flow was observed around a growing end of a cobalt silicate tube from a CoCl_2 powder in 10wt.% water solution of sodium silicate. In the experiments, we have also noticed that the growing ends often take shape of two horns. Further detailed investigation has revealed that the helical structure of the metal silicate tubes is double helix formed by twining of the two horns. It is the first time in our knowledge that the double helix like DNA is observed in the formation of inorganic membranes.

我们发现了一种新型现象，即从含有硅酸钠硅钠溶液中的金属盐粉中生长的金属硅管从金属盐粉中生长出来，形成了扭曲的（手性或螺旋）结构。在金属硅管的不断增长过程中，金属盐的水溶液通过管传递并在生长的末端发射。我们已经给出了实验证据，表明在金属盐溶液中施加在阴离子上的洛伦兹力与螺旋结构的形成有关。但是，为什么lor骨在阴离子上施加的力尚未解决，因为金属盐溶液的流量与施加的磁场平行。我们提出了以下模型以解释原因：在金属盐溶液中包含的离子中，金属离子被困在金属硅胶膜中，而阴离子则向外发射，并且可能具有垂直于磁场的运动成分。洛伦兹力为确认该模型，我们在磁场下开发了一个原位观察系统。在B = 2.2 t和B db/dx = 46 T^2/m的梯度场中，在10WT。％水溶液中的COCL_2粉末的钴硅管的生长端周围观察到涡流流。在实验中，我们还注意到，生长的末端通常形成两个角。进一步的详细研究表明，金属硅管的螺旋结构是通过两个角缠绕形成的双螺旋。我们知道，在无机膜的形成中观察到双螺旋之类的DNA。

项目成果

自立ケイ酸化金属チューブにおけるヘリカル構造の磁場誘起

独立式金属硅酸盐管中螺旋结构的磁场感应

• 发表时间: 2006
• 期刊: 第20回熊本県産学官技術交流会講演論文集
• 作者: 荒木友治;横井裕之;黒田規敬;角舘洋三
• 通讯作者: 角舘洋三

Gradient field effect on the growth of metal silicate tubes

梯度场对金属硅酸盐管生长的影响

• 发表时间: 2005
• 期刊: Proceedings of 19^<th> forum on technological exchange among industry-academics-government in Kumamoto prefecture
• 作者: Y.Araki;H.Yokoi;N.Kuroda;Y.Kakudate
• 通讯作者: Y.Kakudate

Formation of Helical Structure in Silicate under Gradient Magnetic Fields

梯度磁场下硅酸盐螺旋结构的形成

• 发表时间: 2004
• 期刊: Transactions of Materials Research Society of Japan 29・8
• 作者: H.Yokoi;S.Usuba;Y.Kakudate
• 通讯作者: Y.Kakudate

ケイ酸金属チューブの成長に対する勾配磁場効果

梯度磁场对金属硅酸盐管生长的影响

• 发表时间: 2005
• 期刊: 第19回熊本県産学官技術交流会講演論文集
• 作者: 荒木友治;横井裕之;黒田規敬;角舘洋三
• 通讯作者: 角舘洋三

Magnetic field induced helical structure in freestanding metal silicate tubes

独立式金属硅酸盐管中的磁场感应螺旋结构

• 发表时间: 2005
• 期刊: Journal of Applied Physics 97・10(3)
• 作者: H.Yokoi;N.Kuroda;Y.Kakudate
• 通讯作者: Y.Kakudate