文献类型：期刊文献

中文题名：In-situ liquid-cell TEM study of radial flow-guided motion of octahedral Au nanoparticles and nanoparticle clusters

英文题名：In-situ liquid-cell TEM study of radial flow-guided motion of octahedral Au nanoparticles and nanoparticle clusters

作者：Chang Li[1];Xin Chen[1,2];Haiyang Liu[1];Jiali Fang[1];Xiaoqin Zhou[1]

机构：[1]School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;[2]Key Laboratory for Ultrafine Materials of Ministry of Education and Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai200237, China

年份：2018

卷号：11

期号：9

起止页码：4697

中文期刊名：Nano Research

外文期刊名：纳米研究（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2017_2018】；PubMed;

语种：英文

中文关键词：in situ transmissionelectron microscopy （TEM）;nanoparticles;nanoassembling;nanoscale fluids;trapping force

外文关键词：in situ transmissionelectron microscopy （TEM）;nanoparticles;nanoassembling;nanoscale fluids;trapping force

摘要：The dynamic behavior of octahedral gold nanopartides （NPs） and nanoparticle clusters （NPCs） in aqueous solution is studied by in-situ liquid-cell transmission electron microscopy （TEM）. The octahedral Au NPs/NPCs show preferential orientations in the liquid cell, due to the interaction with the SiNx window. The Au NPs show long-range reversible hopping and three-dimensional （3D） rotational motions in the liquid environment. At the same time, the Au NPCs and NPs perform slow stick-sUp and stick-roU motions, respectivel~ with a centripetal trend. The centripetal motions were explained by a liquid evaporation-induced radial flow model in which the NPCs/NPs trajectories are controlled by Stokes forces and surface friction by the silicon nitride window. The calculated radius-dependent force （Fc） on the NPCs/NPs shows a semi-linear correlation with the distance r between the NPCs/NPs and the center of mass, accompanied with stochastic fluctuations, in agreement with the model predictions. This work thus demonstrates the effectiveness of in situ liquid-cell TEM for the in-depth understanding of complicated liquid flow and force interactions in nanomaterials.
The dynamic behavior of octahedral gold nanopartides （NPs） and nanoparticle clusters （NPCs） in aqueous solution is studied by in-situ liquid-cell transmission electron microscopy （TEM）. The octahedral Au NPs/NPCs show preferential orientations in the liquid cell, due to the interaction with the SiNx window. The Au NPs show long-range reversible hopping and three-dimensional （3D） rotational motions in the liquid environment. At the same time, the Au NPCs and NPs perform slow stick-sUp and stick-roU motions, respectivel~ with a centripetal trend. The centripetal motions were explained by a liquid evaporation-induced radial flow model in which the NPCs/NPs trajectories are controlled by Stokes forces and surface friction by the silicon nitride window. The calculated radius-dependent force （Fc） on the NPCs/NPs shows a semi-linear correlation with the distance r between the NPCs/NPs and the center of mass, accompanied with stochastic fluctuations, in agreement with the model predictions. This work thus demonstrates the effectiveness of in situ liquid-cell TEM for the in-depth understanding of complicated liquid flow and force interactions in nanomaterials.