Control of the morphology of nanostructured particles prepared by the spray drying of a nanoparticle sol
Control of the morphology of nanostructured particles prepared by the spray drying of a nanoparticle sol
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DOI：
10.1016/s0021-9797(03)00519-8
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发表时间：
2003-09-15
影响因子：
9.9
通讯作者：
Okuyama, K
中科院分区：
文献类型：
--
作者：
Iskandar, F;Gradon, L;Okuyama, K
通过实验研究了纳米粒子溶胶喷雾干燥制备纳米结构粒子的形貌控制，并根据现有理论对实验结果进行了定性解释。理论分析表明，液滴的结构稳定性和干燥过程中的流体动力学效应在控制所得颗粒的形态方面起着重要作用。液滴中溶胶的大小、液滴的大小、液滴的粘度、干燥温度、气体流速和表面活性剂的添加都是影响颗粒形态的关键参数。实验上，在各种制备条件下从纳米尺寸的二氧化硅溶胶制备纳米结构的二氧化硅颗粒。当液滴尺寸大时，结合高温、高气体流速和在添加的表面活性剂存在下，可以产生甜甜圈形状的颗粒。喷雾干燥方法的适当选择允许通过改变制备条件来控制粒度和形状，范围从球形到椭圆形以及甜甜圈形颗粒。这些结果为控制各种纳米结构颗粒的形成开辟了一条新的途径。(C)2003年爱思唯尔公司All rights reserved.
The control of the morphology of nanostructured particles prepared by the spray drying of nanoparticle sol was investigated experimentally and the results are qualitatively explained based on available theory. A theoretical analysis indicates that the structural stability of the droplet and the hydrodynamic effects during the drying process play important roles in controlling the morphology of the resulting particles. The size of the sol in the droplet, droplet size, viscosity of droplet, drying temperature, gas flow rate, and addition of surfactant are all crucial parameters that affect the morphology of particles. Experimentally, nanostructured silica particles were prepared from a nanosize silica sol under various preparation conditions. Doughnut-shaped particles can be produced when the droplet size is large, in conjunction with high temperature, high gas flow rate and in the presence of an added surfactant. Appropriate choice of the spray drying method permits control of the particle size and shape, ranging from spheres to ellipsoids as well as doughnut-shaped particles by varying the preparation conditions. The results open a new route to controlling the formation of a wide variety of nanostructured particles. (C) 2003 Elsevier Inc. All rights reserved.