Formation of ZIF-8 membranes and crystals in a diluted aqueous solution

详细信息    查看全文

• 作者：Jianfeng Yao ; ^{jianfeng.yao@monash.edu} ; Lunxi Li ; Wei Hao Benjamin Wong ; Chengzhen Tan ; Dehua Dong ; Huanting Wang ; ^{huanting.wang@monash.edu}
• 关键词：Organometallic compounds ; Crystal growth ; Electron microscopy ; Nucleation
• 刊名：Materials Chemistry and Physics
• 出版年：2013
• 出版时间：15 May, 2013
• 年：2013
• 卷：139
• 期：2-3
• 页码：1003-1008
• 全文大小：1652 K

文摘

Alumina hollow fiber supported ZIF-8 membranes and crystals have been prepared in diluted aqueous solutions. The concentration of the aqueous solution, synthesis temperature and time were examined in detail. The particle sizes of ZIF-8 crystals increased from about 90?nm to 5.0?¦Ìm with the increase of the dilution of the aqueous synthesis solution. Continuous ZIF-8 membranes were obtained by using the diluted synthesis solution with a Zn²⁺:2-methylimidazolate:H₂O molar ratio of 1:70:4952 at 50-70?¡ãC for 24?h, and their thicknesses were about 0.8-1.4?¦Ìm. Gas permeation tests indicated the ZIF-8 membranes are continuous and compact. The schematic formation of ZIF-8 membranes and crystals were proposed, and only in the diluted aqueous solution, ZIF-8 membranes and crystals could be prepared at the same time.