Robust Bijels for Reactive Separation via Silica-Reinforced Nanoparticle Layers
Robust Bijels for Reactive Separation via Silica-Reinforced Nanoparticle Layers
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DOI：
10.1021/acsnano.8b05718
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发表时间：
2019-01-01
期刊：
影响因子：
17.1
通讯作者：
Lee, Daeyeon
中科院分区：
文献类型：
--
作者：
Di Vitantonio, Giuseppe;Wang, Tiancheng;Lee, Daeyeon
Pickering乳液已成功地用作催化和分离的介质。然而，在这些体系中，不能以连续模式同时进行反应和分离，因为试剂不容易装载到分散相中或从分散相中回收。双连续界面堵塞乳胶(Bijels)，其中油相和水相在整个结构中是连续的，有可能作为以连续模式同时反应和分离的介质。在这项工作中，我们向实现这一愿景迈出了重要的一步，展示了双凝胶用于以批量方式进行反应分离的能力。为了有效地进行操作，双凝胶必须在反应过程中保持其形态和界面传质特性。为了加强双凝胶，我们修改了溶剂转移诱导相分离(STRIPS)方法，使双凝胶耐机械应力，并通过化学融合界面纳米粒子来防止由于pH变化而导致的纳米粒子从油/水界面分离。这种增强的双凝胶在碱催化的酯水解中得到了成功的测试，并在这些具有挑战性的条件下保持了坚固的性能。
Pickering emulsions have been successfully used as media for catalysis and separation. However, simultaneous reaction and separation cannot be performed in a continuous mode in these systems, because reagents cannot be readily loaded into or recovered from the dispersed phase. Bicontinuous interfacially jammed emulsion gels (bijels), in which the oil and water phases are continuous throughout the structure, have potential as media for simultaneous reaction and separation in a continuous mode. In this work, we take a major step toward realizing this vision by demonstrating the ability of bijels to be used in reactive separation performed in a batch fashion. To perform effectively, bijels must maintain their morphology and interfacial mass transfer properties during reaction. To strengthen the bijels, we modify the solvent transfer-induced phase separation (STRIPS) method to make bijels resistant to mechanical stresses and prevent detachment of nanoparticles from the oil/water interface due to pH changes by chemically fusing the interfacial nanoparticles. The reinforced bijel is successfully tested in base-catalyzed hydrolysis of esters and remains robust under these challenging conditions.