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首页> 外文期刊>Colloids and Surfaces, A. Physicochemical and Engineering Aspects >Kinetic analyses of colloidal crystallization in microgravity-aircraft experiments
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Kinetic analyses of colloidal crystallization in microgravity-aircraft experiments

机译：微重力飞机实验中胶体结晶的动力学分析

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Nucleation and growth processes in colloidal crystallization of silica spheres were studied in microgravity produced by parabolic flights of an aircraft. A continuous circulating type of stopped flow cell system was used, and the time-resolved reflection spectra were measured. The cell system is composed of a peristaltic pump, a column containing a mixed bed of ion-exchange resins and a quartz observation cell. They are connected to a PharMed tube in a closed circuit, Close-up observation with a CCD camera was made. Nucleation rates decrease in microgravity. Crystal growth rates of the face-centered cubic (fcc) lattices decrease in microgravity (0 G) by about 25% compared with those in gravity (1 G). One of the main reasons for the retardation is that the downward diffusion of spheres, which may enhance the inter-sphere collision, disappears in microgravity. No convection of the suspensions in microgravity is also important.
机译：通过飞机的抛物线飞行产生的微重力研究了二氧化硅球胶体结晶中的成核和生长过程。使用连续循环类型的停止流通池系统，并测量时间分辨的反射光谱。样品池系统由蠕动泵，装有离子交换树脂混合床的色谱柱和石英观察池组成。它们以闭路连接到PharMed管，并用CCD相机进行近距离观察。在微重力下成核速率降低。与重力（1 G）相比，面心立方（fcc）晶格的晶体生长速率在微重力（0 G）中降低了约25％。延迟的主要原因之一是，球的向下扩散（可能会增强球间碰撞）在微重力中消失。悬浮液在微重力下的对流也很重要。

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