肖海燕¹，尹家福¹，程泉勇²，周倩婕¹，陈家董¹，黄才利²，殷盼超^1*

1. 华南理工大学，华南软物质科学与技术高等研究院，广州 510640；

2. 华中科技大学, 化学与化工学院, 武汉 430074

Pickering emulsions stabilized by colloidal particles or their mixtures with surfactants have received increasing interests in recent years, but few of them can produce gel emulsions with practical stability. Herein, robust gel emulsions can be facilely prepared through the charge attraction-driven complexation and enrichment of negatively charged coordination nanocages (CNCs) and cationic surfactants at liquid/liquid interfaces. Due to CNCs’ ultra-small sizes (~ 2.5 nm) and highly charged features, they strongly interact with surfactants to jam the biphasic interfaces and endow the formed membranes with high cohesive energy densities, leading to the robust formation of gel emulsions with widely tunable liquid compositions. Moreover, the gel emulsions possess promising mechanical strength up to 10⁴ Pa and the biphasic membranes can maintain their 3D hierarchical structures when both liquids are removed. Their preparation can be feasibly scaled up, enabling their applications in hierarchical porosity construction, gas adsorption and solid-state electrolytes.

  分子簇是指一类尺寸处于1到10纳米的结构明确且单分散的纳米基元，其中最经典的代表是多酸（POMs），配位纳米笼（CNC）和笼型聚倍半硅氧烷 (POSS)等，它们在催化、吸附与分离、光电磁材料等领域拥有广阔的应用前景。通过设计合成带负电荷的分子簇，将其与带正电荷的高分子配体协同自组装，实现了分子簇表面活性剂在油/水界面的稳定吸附及组装，基于静电相互作用构建的分子簇表面活性剂能够最大限度地降低油/水体系的界面能，将分子簇表面活性剂牢牢锁定在液/液界面，使得系统发生了堵塞相变，由于分子簇较小的尺寸以及分子簇和表面活性剂之间强烈的电荷相互作用，稳定的乳液凝胶得以在远离分离点的二元液体中触发形成。此外，新型的乳液凝胶可以简单地扩大。该方法有望为新型乳液凝胶的设计提供新思路，并有望在功能多孔材料方面得以应用。

文章链接：https://pubs.acs.org/doi/10.1021/acsanm.1c01952