期刊
NANO LETTERS
卷 20, 期 10, 页码 7108-7115出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02352
关键词
Brownian motion; diffusion; liquid cell; scanning transmission electron microscopy; single particle; low flux
类别
资金
- Technical University of Denmark
- Danish Research Council for Technology and Production [12-126194]
- Advanced Materials for Energy-Water Systems (AMEWS) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- VILLUM foundation [00028273]
- Otto Monsteds Fond
Liquid-phase transmission electron microscopy (LPTEM) offers label-free imaging of nanoparticle (NP) processes in liquid with sub-nanometer spatial and millisecond temporal resolution. However, LPTEM studies have reported only on NPs moving orders of magnitude slower than expected from bulk aqueous liquid conditions, likely due to strong interactions with the LPTEM liquid-enclosing membranes. We demonstrate how scanning transmission electron microscope (STEM) imaging can be used to measure the motion of individual NPs and agglomerates, which are not hindered by such interactions. Only at low electron flux do we find that individual NPs exhibit Brownian motion consistent with optical control experiments and theoretical predictions for unhindered passive diffusive motion in bulk liquids. For increasing electron flux, we find increasingly faster than passive motion that still appears effectively Brownian. We discuss the possible origins of this beam-sample interaction. This establishes conditions for the use of STEM as a reliable tool for imaging nanoscale hydrodynamics in situ TEM.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据