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首页> 外文学位 >Diffusion, viscosity and activity of supersaturated solutions of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, and triglycine sulfate and the growth of crystals in microgravity.
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Diffusion, viscosity and activity of supersaturated solutions of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, and triglycine sulfate and the growth of crystals in microgravity.

机译：磷酸二氢钾，磷酸二氢铵和硫酸三甘氨酸的过饱和溶液的扩散，粘度和活性，以及​​微重力下晶体的生长。

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摘要

The factors that affect the growth of crystals from water solution in microgravity have been examined. Three nonlinear optical materials have been studied, potassium dihydrogen phosphate (KDP), ammonium dihydrogen phosphate (ADP) and triglycine sulfate (TGS). TGS is a crystal formed composed of three glycine molecules and one molecule of sulfuric acid. The diffusion coefficient of the solutions in the supersaturated region was measured using Gouy interferometry. The viscosity of the solutions in the supersaturated region was measured using a capillary viscometer. At low supersaturations the diffusion coefficient is changing rather slowly, while the viscosity is rising more rapidly. Micron-sized droplets of solution were suspended in an electrodynamic levitator. From this experiment, the width of the metastable region was found to be much wider than that ordinarily obtained in bulk solutions and the activity of the solute was measured over this region. Theories of cluster formation were used to estimate values for the extent of solute clustering and the critical cluster size using these data. Column gradient experiments showed no sign of clustering at low supersaturations and there was no measurable time change of the viscosity. The crystal growth rate is strongly affected by the change of the diffusion coefficient with concentration.
机译：已经研究了影响微重力下水溶液中晶体生长的因素。已经研究了三种非线性光学材料，磷酸二氢钾（KDP），磷酸二氢铵（ADP）和硫酸三甘氨酸（TGS）。 TGS是由三个甘氨酸分子和一个硫酸分子组成的晶体。使用Gouy干涉法测量溶液在过饱和区域的扩散系数。使用毛细管粘度计测量过饱和区域中溶液的粘度。在低过饱和度时，扩散系数变化相当缓慢，而粘度则上升得更快。将微米大小的溶液液滴悬浮在电动悬浮器中。从该实验中，发现亚稳态区域的宽度比在本体溶液中通常获得的宽度宽得多，并且在该区域上测量了溶质的活性。团簇形成的理论被用来根据这些数据估算溶质团簇程度和临界团簇大小的值。柱梯度实验表明在低过饱和度下没有聚集迹象，并且没有可测量的粘度时间变化。晶体生长速率受扩散系数随浓度变化的强烈影响。

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