Optothermophoretic Manipulation of Colloidal Particles in Nonionic Liquids.
Optothermophoretic Manipulation of Colloidal Particles in Nonionic Liquids.
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DOI：
10.1021/acs.jpcc.8b03828
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Xiaolei Peng;Linhan Lin;E. H. Hill;Pranaw Kunal;S. M. Humphrey;Yuebing Zheng
中科院分区：
文献类型：
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作者：
Xiaolei Peng;Linhan Lin;E. H. Hill;Pranaw Kunal;S. M. Humphrey;Yuebing Zheng
胶体颗粒对光控制的外部温度场的响应可以用于颗粒的光热泳操纵。热电效应被认为是在光照射的热区域热泳捕获颗粒的驱动力，因此仅限于离子液体。本文实现了胶体粒子在水、乙醇、异丙醇和正丁醇等非离子液体中的光热泳操纵，并从分子水平上建立了操纵的物理机制。我们发现，非离子驱动力来源于一个分层结构的溶剂分子在粒子-溶剂界面，这是支持分子动力学模拟。此外，亲水性，溶剂类型，和离子强度的层状界面结构的影响，从而粒子的捕获稳定性进行了研究，提供分子水平的洞察热泳和光热操纵界面工程的指导。
The response of colloidal particles to a light-controlled external temperature field can be harnessed for opto-thermophoretic manipulation of the particles. The thermoelectric effect is regarded as the driving force for thermophoretic trapping of particles at the light-irradiated hot region, which is thus limited to ionic liquids. Herein, we achieve opto-thermophoretic manipulation of colloidal particles in various non-ionic liquids, including water, ethanol, isopropyl alcohol and 1-butanol, and establish the physical mechanism of the manipulation at the molecular level. We reveal that the non-ionic driving force originates from a layered structure of solvent molecules at the particle-solvent interface, which is supported by molecular dynamics simulations. Furthermore, the effects of hydrophilicity, solvent type, and ionic strength on the layered interfacial structures and thus the trapping stability of particles are investigated, providing molecular-level insight into thermophoresis and guidance on interfacial engineering for optothermal manipulation.