Fabrication of a Highly b-Oriented MFI-Type Zeolite Film by the Langmuir鈥揃lodgett Method

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• 作者：Zheng Wang ; Ting Yu ; Pei Nian ; Qingchun Zhang ; Junkang Yao ; Shan Li ; Zuoning Gao ; Xianglong Yue
• 刊名：Langmuir
• 出版年：2014
• 出版时间：April 29, 2014
• 年：2014
• 卷：30
• 期：16
• 页码：4531-4534
• 全文大小：208K
• 年卷期：v.30,no.16(April 29, 2014)
• ISSN：1520-5827

文摘

sec-Butanol-modified rounded-coffin-shaped silicalite-1 (SL) microcrystals were assembled into a compact and highly b-oriented monolayer extending over the centimeter scale via the Langmuir鈥揃lodgett (LB) technique. For comparison, methanol- or ethanol-modified SL microcrystals could not float and were compressed into a dense film in an LB trough. Subsequently, highly b-oriented MFI films with a thickness of 1.5 渭m were successfully obtained on the solid substrates by secondary growth of the LB monolayer using tetrapropylammonium hydroxide (TPAOH) as the structure-directing agent. The electrochemical experiments confirmed that the prepared films were defect-free. In general, the LB method is a highly controllable and reproducible method of organizing anisotropic zeolite crystals with a preferred orientation over a relatively large surface area. The LB technique could be further applied as an effective platform for the oriented assembly of different types of zeolite particles and the growth of variously oriented zeolite films.