Using gradient magnetic fields to suppress convection during crystal growth
Using gradient magnetic fields to suppress convection during crystal growth
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DOI：
10.1021/cg0600546
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发表时间：
2006-10-04
影响因子：
3.8
通讯作者：
Vlieg, E.
中科院分区：
文献类型：
--
作者：
Poodt, P. W. G.;Heijna, M. C. R.;Vlieg, E.
使用原位纹影显微镜，我们已经研究了六水合硫酸镍晶体的生长过程中的梯度磁场的条件下，对流被抑制，调查是否发生在这里的功能是相同的微重力晶体生长过程中发生的。据观察，随着有效重力的下降，耗尽区扩大。如果对流被抑制，耗尽区不断扩大，晶体生长速率显着降低，达到一个恒定值。虽然仍有一些残余流量，但非常缓慢，不会影响枯竭区。我们发现，在毫重力范围内的有效重力的均匀性是足以抑制对流。结果表明，梯度磁场晶体生长是空间微重力晶体生长的一种很好的替代方法。
Using in situ schlieren microscopy, we have studied the growth process of nickel sulfate hexahydrate crystals in a gradient magnetic field under conditions where convection is suppressed, to investigate whether the features that occur here are the same as those that occur during microgravity crystal growth. An expansion of the depletion zone with decreasing effective gravity was observed. If convection is suppressed, the depletion zone keeps expanding and the crystal growth rate decreases significantly, reaching a constant value. Although there remains some residual flow, it is very slow and does not affect the depletion zone. We find that homogeneity of the effective gravity in the milligravity range is sufficient to suppress convection. The results show that crystal growth in gradient magnetic fields is a good alternative for microgravity crystal growth in space.