Spatiotemporally controlled emergence of nanoparticle microvortices under electric field  

作　　者：Qi Pan Xijian Lin Shiyuan Wei Jinghong Su Hansen Zhao Xiaojie Duan Guoqing Hu Yan He 

机构地区：[1]Department of Chemistry,Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education),Tsinghua University,Beijing,China [2]Department of Biomedical Engineering,College of Future Technology,Peking University,Beijing,China [3]Academy for Advanced Interdisciplinary Studies,Peking University,Beijing,China [4]The State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing,China [5]School of Engineering Science,University of Chinese Academy of Sciences,Beijing,China [6]Department of Engineering Mechanics,State Key Laboratory of Fluid Power and Mechatronic Systems,Zhejiang University,Hangzhou,China

出　　处：《Aggregate》2024年第2期290-300,共11页聚集体（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:21425519,21621003,91853105,22127807。

摘　　要：Controlled assembly of nanoparticles(NPs)has garnered much interest over the past two decades.Beyond established techniques,new methods utilizing local short-range or large-scale long-range interactions remain to be explored to achieve diverse micro-and nanoscale structures.Here,we report the controlled emergence of vortex-pair arrays within monodispersed gold nanorods by applying a direct current electric field across a pair of sawtooth electrodes.By employing in situ darkfield microscopy and particle collective analysis,we elucidate the mechanism behind the formation and stabilization of the NP vortices,attributing it to the combined effects of the electrode shape,high NP density,and high solution viscosity.We further explore the controllability of the vortex-pair arrays and obtain multiple complex vortice patterns.Our findings will facilitate the investigation of efficient and controlled dynamic assembly of NPs under external fields and help manufacture next-generation optoelectronic functional materials.

关 键 词：dynamic assembly electric field gold nanoparticles sawtooth electrodes VORTEX 

分 类 号：TB383[一般工业技术—材料科学与工程]