Microencapsulation of TiO2 Nanoparticles with Polymer by Rapid Expansion of Supercritical Solution
Microencapsulation of TiO2 Nanoparticles with Polymer by Rapid Expansion of Supercritical Solution
复制标题
超临界溶液快速膨胀法将 TiO2 纳米颗粒与聚合物微胶囊化
DOI：
10.1023/a:1024421514009
复制
发表时间：
2003
影响因子：
2.5
通讯作者：
H. Matsuyama
中科院分区：
文献类型：
--
作者：
K. Matsuyama;K. Mishima;Ken‐ichiro Hayashi;H. Matsuyama
报道了一种用非溶剂快速膨胀超临界溶液制备纳米二氧化钛微胶囊的新方法。将二氧化钛纳米颗粒悬浮在含有助溶剂和溶解聚合物的二氧化碳中，通过喷嘴喷洒到大气压下。经过快速膨胀，得到了聚合物微球。微球不倾向于团聚，因为纯助溶剂对聚合物来说是非溶剂。用扫描电子显微镜、透射电子显微镜和X射线衍射仪对微球的结构和形貌进行了研究。所得聚合物微球为纳米二氧化钛微胶囊。通过改变聚合物浓度、预膨胀压力、温度和注射距离，可以控制微胶囊的平均粒径和粒径分布。聚合物原料组合物在控制颗粒大小方面比其他因素更有效。
A novel preparation method is reported for the microencapsulation of TiO2nanoparticles by rapid expansion of supercritical solution with a nonsolvent. A suspension of TiO2nanoparticles in carbon dioxide containing a cosolvent and dissolved polymer is sprayed through a nozzle to atmospheric pressure. After rapid expansion, polymer microspheres were obtained. The microspheres do not tend to agglomerate, since the pure cosolvent is a nonsolvent for the polymer. The structure and morphology of microspheres were investigated by SEM, TEM and XRD. The obtained polymer microspheres are microcapsules of TiO2nanoparticles. The mean particle diameter and particle size distribution of microcapsules, could be controlled by changing the polymer concentration, pre-expansion pressure, temperature and injection distance. The polymer feed compositions are more effective than other factors on the control of particle size.