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

我们发现了一种新型现象，它是一种自由的金属硅酸盐管生长的金属盐粉末，如FeCl_2和CoCl_2在水溶液中浸泡的钠硅酸盐形式的扭曲（手性或辅助）结构。在金属硅管的生长过程中，金属盐的一种解决方案通过管并在生长过程中释放出来。我们已经提供了一个实验证明，即洛伦兹部队对金属盐解决方案中的动画与辅助结构的形成有关。However，为什么Lorents的力量在动画上没有解决，因为金属盐溶液的流动是平行应用于磁性领域的。我们提出了一个遵循的模型来解释原因：在金属盐溶液中包括金属盐溶液中，金属被困在金属硅膜中，当它们被释放时，可能有一个运动分量永久性地进入磁场。Lorentz Force会在这样一个宏观的变化和生成vertex的流动上消失，在固体化之前会扭曲管子。在订购确认此模型后，我们已经在磁场下开发了一个现场观测系统。在B=2.2 T和B·dB/dx=46 T^2/m的梯度场中，涡流在10 wt的钴硅管中观察到生长的末端，从CoCl_2粉末中生长。硅酸钠的水溶液。在实验中，我们也注意到，生长的结果往往会采取两个角的形状。进一步详细的调查已经揭示，金属硅管的辅助结构是由双角的双螺旋形式形成的。这是我们第一次在我们的知识中看到DNA，就像双螺旋一样。

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.