Morphology and Particle Size Distribution Controls of Droplet-to-Macroporous/Hollow Particles Formation in Spray Drying Process of Colloidal Mixtures Precursor
Morphology and Particle Size Distribution Controls of Droplet-to-Macroporous/Hollow Particles Formation in Spray Drying Process of Colloidal Mixtures Precursor
复制标题
胶体混合物前驱体喷雾干燥过程中液滴到大孔/空心颗粒形成的形态和粒径分布控制
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
L. Gradoń
中科院分区：
文献类型：
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作者：
Sin Young Lee;W. Widiyastuti;Ferry Iskandar;K. Okuyama;L. Gradoń
研究了超声喷雾干燥法对液滴到大孔/中空颗粒形成的形态控制，以及用聚苯乙烯乳胶（PSL）和带负电荷的二氧化硅纳米颗粒的胶体混合物为前驱体产生的颗粒的液滴和粒径分布之间的相关性。利用带负电荷的PSL胶体成功制备了多孔颗粒。另一方面，带正电的PSL胶体倾向于产生空心颗粒。利用液滴质量平衡原理计算得到的干燥颗粒的粒径分布与实测值吻合较好。然而，对于多孔颗粒形成，测量的PSD小于计算的PSD。还研究了PSL和二氧化硅胶体浓度对起始材料的影响以及工艺停留时间对最终多孔颗粒的影响。较高的PSL胶体浓度、较低的二氧化硅胶体浓度和较短的停留时间导致测量值与计算值之间的PSD偏差较大。本文还讨论了产生这些现象的原因。
The morphology control of droplet-to-macroporous/hollow particles formation using an ultrasonically spray-drying method as well as correlation between the droplet and particle size distribution of generated particles using a precursor of colloidal mixtures of polystyrene latex (PSL) and negatively charged silica nanoparticles were demonstrated. Porous particles were successfully produced by negatively charged PSL colloids. On the other hand, positively charged PSL colloids tended to generate hollow particles. The measured particle size distribution (PSD) of hollow particles agreed well with the calculated PSD using a mass balance principle of droplet to drying particles of silica and PSL composites. However, for porous particle formation, the measured PSD was smaller than the calculated PSD. The effects of PSL and silica colloids concentrations on a starting material as well as process residence time on the final porous particles were also investigated. A high PSL colloid concentration, low silica colloid concentration, and a short residence time of the process led to higher PSD deviation between the measurement and the calculation. The cause of these phenomena was also discussed in this article.