螺旋吡喃基离子液体表面活性剂和UiO-66-NH2乳化的可调光酸洗乳。

IF 6.6 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ChemSusChem Pub Date : 2025-09-25 DOI:10.1002/cssc.202501618
Zhiyong Li, Linhui Niu, Liufang Zhao, Yunlei Shi, Huiyong Wang, Yang Zhao, Jianji Wang
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引用次数: 0

摘要

催化反应的主要目标是尽量减少催化剂的使用,降低活化能,缩短反应时间。皮克林乳剂为实现这些目标提供了一个有效的平台。一个关键的挑战是开发简单、有效的方法,使快速反应、容易的产品分离、催化剂回收和乳化剂再利用。本文提出了一种由螺旋吡喃基离子液体表面活性剂、UiO-66-NH2、甲苯和水组成的光开关水包油(O/W)皮克林乳液。该体系在可见光和紫外光交替作用下,能在破乳和乳化之间可逆过渡。这一特性使得O/W Pickering乳液可以作为一个精确控制的界面催化反应器,通过Click反应合成亲水性产物。催化平台是高效的,需要最少的催化剂负载。它将活化能从33.6降低到8.5 kJ mol-1,降低了四倍,并将转化效率提高了50%以上。在可见光下,螺吡喃在水中的结构由亲水的开环MC转变为疏水的闭环SP。这种结构变化增强了螺旋吡喃基离子液体表面活性剂对UiO-66-NH2的吸附能力,提高了其在甲苯和水之间的分配系数。同时,表面活性剂的表面活性降低,这解释了皮克林乳状液的光响应相行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Light-Switchable Pickering Emulsions Emulsified by Spiropyran-Based Ionic Liquid Surfactants and UiO-66-NH2.

The main goals of catalytic reactions are to minimize catalyst use, reduce activation energy, and shorten reaction time. Pickering emulsions offer an effective platform for achieving these goals. A key challenge is developing simple, efficient methods that enable fast reactions, easy product separation, catalyst recovery, and emulsifier reuse. Herein, a light-switchable oil-in-water (O/W) Pickering emulsion composed of a spiropyran-based ionic liquid surfactant, UiO-66-NH2, toluene, and water is presented. The system can reversibly transition between demulsification and emulsification under alternating visible and ultraviolet light. This feature enables the O/W Pickering emulsion to function as a precisely controlled interfacial catalysis reactor for synthesizing hydrophilic products via Click reaction. The catalytic platform is highly efficient, requiring minimal catalyst loading. It reduces activation energy from 33.6 to 8.5 kJ mol-1, a fourfold decrease, and improves conversion efficiency by more than 50%. Under visible light, the spiropyran structure in water shifts from a hydrophilic open-ring MC form to a hydrophobic closed-ring SP configuration. This structural change enhances the adsorption capacity of the spiropyran-based ionic liquid surfactant on UiO-66-NH2 and increases its partition coefficient between toluene and water. At the same time, the surfactant's surface activity decreases, which explains the light-responsive phase behavior of Pickering emulsions.

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来源期刊
ChemSusChem
ChemSusChem 化学-化学综合
CiteScore
15.80
自引率
4.80%
发文量
555
审稿时长
1.8 months
期刊介绍: ChemSusChem Impact Factor (2016): 7.226 Scope: Interdisciplinary journal Focuses on research at the interface of chemistry and sustainability Features the best research on sustainability and energy Areas Covered: Chemistry Materials Science Chemical Engineering Biotechnology
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