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Tuning the Interaction of Nanoparticles from Repulsive to Attractive by Pressure
Authors:
Martin Alfred
Schroer
(The Hamburg Centre for Ultrafast Imaging (CUI), Deutsches Elektronen-Synchrotron DESY)
,
Florian
Schulz
(University of Hamburg, The Hamburg Centre for Ultrafast Imaging (CUI),)
,
Felix
Lehmkühler
(The Hamburg Centre for Ultrafast Imaging (CUI), Deutsches Elektronen-Synchrotron DESY)
,
Johannes
Möller
(4) ESRF - The European Synchrotron)
,
Andrew J.
Smith
(Diamond Light Source)
,
Holger
Lange
(University of Hamburg, The Hamburg Centre for Ultrafast Imaging (CUI),)
,
Tobias
Vossmeyer
(Institute of Physical Chemistry, University of Hamburg)
,
Gerhard
Grübel
(The Hamburg Centre for Ultrafast Imaging (CUI), Deutsches Elektronen-Synchrotron DESY)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
The Journal Of Physical Chemistry C
State:
Published (Approved)
Published:
August 2016
Diamond Proposal Number(s):
11192
Abstract: We report a high pressure small-angle X-ray scattering (SAXS) study on concentrated aqueous suspensions of gold nanoparticles coated with a poly(ethylene glycol) (PEG)-based ligand shell. Analyzing the experimental SAXS data with a liquid-state theory approach, we find a pressure-induced transition of the interparticle interactions from repulsive to attractive in the pressure range from 1 to 4000 bar that also depends on the particle concentration. This transition is related to structural changes of the ligand shell which is compressed with increasing pressure. Our study highlights the important, yet unexplored role of pressure for the interaction of nanoparticle systems.
Subject Areas:
Materials,
Physics,
Chemistry
Instruments:
I22-Small angle scattering & Diffraction