Brostrøm Bluhme, Anders

Mortensen, Kim I.

Mølhave, Kristian

Sun, Hongyu

Tidemand-Lichtenberg, Sofie

Yesibolati, Murat Nulati

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Aug 03, 2018Fast Brownian Dynamics of Nanoparticles Observed in Liquid Phase ScanningTransmission Electron MicroscopyYesibolati, Murat Nulati; Sun, Hongyu; Mortensen, Kim; Tidemand-Lichtenberg, Sofie ; BrostrømBluhme, Anders ; Mølhave, KristianPublication date:2018Document VersionPeer reviewed versionLink back to DTU OrbitCitation (APA):Yesibolati, M. N., Sun, H., Mortensen, K. I., Tidemand-Lichtenberg, S., Brostrøm Bluhme, A., & Mølhave, K.(2018). Fast Brownian Dynamics of Nanoparticles Observed in Liquid Phase Scanning Transmission ElectronMicroscopy. Abstract from SCANDEM 2018, Kgs. Lyngby, Denmark.Session: In Situ Nanoscale Microscopy of Processes: SCANDEM 2018, Technical University of Denmark, Kgs. Lyngby, Denmark Fast Brownian Dynamics of Nanoparticles Observed in Liquid Phase Scanning Transmission Electron Microscopy Murat Nulati Yesibolati*,1, Hongyu Sun1, Kim I. Mortensen1, Sofie Tidemand-Lichtenberg1, Anders Brostrøm Bluhme1, Kristian Mølhave1  1 Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kongens Lyngby, Denmark *E-mail: nuye@nanotech.dtu.dk  Keywords: Brownian motion, diffusion, liquid, scanning transmission electron microscopy  Liquid phase transmission electron microscopy (LPTEM) allows investigating nanoparticle nucleation, growth and dynamics with high spatial and temporal resolution [1]. However, the nanoparticles near the solid-liquid interface in the LPTEM show different dynamics, specifically,  3-7 orders of magnitude smaller diffusion coefficients were typically reported compared to that of Brownian motion in bulk water [2]. The mechanisms behind the anomalously slow motion are not yet clear[3,4]. The nanoparticle dynamics can be dominated by the electron beam modified solid-liquid interface at the encapsulating silicon nitride membrane (Fig 1a), and given the unknown cause of the radically modified behavior, this could raise concerns of how much results on particles on the membranes can be generally trusted as representing ex-situ results. Therefore, in this study, we studied Brownian motion of Au nanoparticles freely moving in the LPTEM in STEM mode as shown in Fig. 1a and b, and measured the translational diffusion coefficient using single particle tracking. For the first time, we report a diffusion coefficient matching that of free Brownian motion ( Fig 1c and d), which establishes LPTEM in STEM mode as a reliable tool with high spatiotemporal resolution for measuring dynamics of nanoparticles in their native environment.  Figure 1: a) Schematic view of STEM imaging in a LPTEM; b) STEM image sequence of freely moving nanoparticles at electron flux 0.51 e-/(Å2×s), in 70 wt% Glycerol/water solution. Frame interval time is  30 ms. For illustration purpose, the moving nanoparticles are marked with circle line; c)  Trajectories of three randomly selected Au particles at the electron flux 0.51 e-/(Å2×s). Time interval is 30ms; d) Mean square displacement (MSD) vs. Δt.  [1] F.M. Ross et al, Liquid Cell Electron Microscopy, Cambridge: Cambridge University Press. (2016).  [2] L.R. Parent, E. Bakalis et al, Accounts of Chemical Research  51, 3-11 ( 2018).  [3] S.W. Chee, Z. Baraissov et al, Journal of Physical Chemistry C 120, 20462-20470 (2016). [4] A. Verch, M. Pfaff , N. de Jonge, Langmuir 31, 6956-6964 (2015).  0.5 µma)b)c) d)

Fast Brownian Dynamics of Nanoparticles Observed in Liquid Phase Scanning Transmission Electron Microscopy

http://orbit.dtu.dk/files/151022799/Scandem_2018_abstract_murat_nanotech.pdf

Fast Brownian Dynamics of Nanoparticles Observed in Liquid Phase Scanning Transmission Electron Microscopy

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology