Crystallization dynamics of supersaturated NaClO_4 aerosols studied by high-speed photography  

作　　者：WANG Feng ZHAO LiJun ZHANG YunHong 

机构地区：[1]Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, China

出　　处：《Chinese Science Bulletin》2008年第14期2139-2144,共6页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 20473012, 20673010 & 20640420450);the "111" Project (Grant No. B07012);the China Postdoctoral Science Foundation (Grant No. 20070410466);the Incuba-tion and Reward Foundation for Excellent Doctoral Dissertation of Beijing Institute of Technology

摘　　要：Single supersaturated NaClO4 aerosol droplets on a quartz substrate were observed by a high-speed video camera for their morphologic changes with decreasing relative humidity (RH). The supersatu- rated droplets were found to form anhydrous NaClO4 at ~10% RH. Three stages were roughly observed in this process, i.e., the main stem appearance, primary and secondary branches growth, and the deep dehydration. The main stem grew steadily and finished in 120 ms. Affected by both crystal precipitation and water evaporation, primary branches grew for 1200 ms, accompanied by a slower growth of sec- ondary branches. The deep dehydration was more complicated, and lasted for a longer time.Single supersaturated NaClO4 aerosol droplets on a quartz substrate were observed by a high-speed video camera for their morphologic changes with decreasing relative humidity （RH）. The supersaturated droplets were found to form anhydrous NaClO4 at -10% RH. Three stages were roughly observed in this process, i.e., the main stem appearance, primary and secondary branches growth, and the deep dehydration. The main stem grew steadily and finished in 120 ms. Affected by both crystal precipitation and water evaporation, primary branches grew for 1200 ms, accompanied by a slower growth of secondary branches. The deep dehydration was more complicated, and lasted for a longer time.

关 键 词：快速拍照技术 过饱和 结晶过程 氯化钠气溶胶 

分 类 号：TQ57[化学工程—精细化工]