Stabilizing Liquid Drops in Nonequilibrium Shapes by the Interfacial Jamming of Nanoparticles
Stabilizing Liquid Drops in Nonequilibrium Shapes by the Interfacial Jamming of Nanoparticles
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DOI：
10.1126/science.1242852
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发表时间：
2013-10-25
期刊：
影响因子：
56.9
通讯作者：
Russell, Thomas P.
中科院分区：
文献类型：
--
作者：
Cui, Mengmeng;Emrick, Todd;Russell, Thomas P.
纳米粒子在两种流体之间的界面处组装成无序的液体状阵列，在那里纳米粒子可以在界面上横向扩散。利用分散在水中的纳米粒子和油中的胺封端聚合物，在界面上原位生成纳米粒子表面活性剂，克服了控制纳米粒子界面吸附的内在弱力。当液区的形状被外场变形时，比表面积增加，更多的纳米颗粒吸附到界面上。释放电场后，界面面积减小，堵塞了纳米颗粒表面活性剂，阻止了进一步的形状变化。堵塞的纳米颗粒保持无序和液体状，使多次、连续的变形和堵塞事件成为可能。进一步的稳定是通过用交联组装体的双官能团取代单官能团来实现的。产生和稳定具有规定形状的液体的能力为反应性液体系统、包装、输送和储存提供了机会。
Nanoparticles assemble at the interface between two fluids into disordered, liquid-like arrays where the nanoparticles can diffuse laterally at the interface. Using nanoparticles dispersed in water and amine end-capped polymers in oil, nanoparticle surfactants are generated in situ at the interface overcoming the inherent weak forces governing the interfacial adsorption of nanoparticles. When the shape of the liquid domain is deformed by an external field, the surface area increases and more nanoparticles adsorb to the interface. Upon releasing the field, the interfacial area decreases, jamming the nanoparticle surfactants and arresting further shape change. The jammed nanoparticles remain disordered and liquid-like, enabling multiple, consecutive deformation and jamming events. Further stabilization is realized by replacing monofunctional ligands with difunctional versions that cross-link the assemblies. The ability to generate and stabilize liquids with a prescribed shape poses opportunities for reactive liquid systems, packaging, delivery, and storage.