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Kinetics of pressure-induced nanocrystal superlattice formation

DOI: 10.1039/C9CP04658E DOI Help

Authors: Felix Lehmkuehler (Deutsches Elektronen-Synchrotron DESY; The Hamburg Centre for Ultrafast Imaging) , Martin A. Schroer (European Molecular Biology Laboratory EMBL) , Verena Markmann (Deutsches Elektronen-Synchrotron DESY) , Lara Frenzel (Deutsches Elektronen-Synchrotron DESY; The Hamburg Centre for Ultrafast Imaging) , Johannes Moeller (European XFEL GmbH) , Holger Lange (The Hamburg Centre for Ultrafast Imaging; University of Hamburg) , Gerhard GrĂ¼bel (Deutsches Elektronen-Synchrotron DESY; The Hamburg Centre for Ultrafast Imaging) , Florian Schulz (The Hamburg Centre for Ultrafast Imaging; University of Hamburg)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics , VOL 47

State: Published (Approved)
Published: September 2019
Diamond Proposal Number(s): 18875

Abstract: Colloidal nanocrystals (NC) are known to self-organize into superlattices that promise many applications ranging from medicine to optoelectronics. Recently, the formation of high-quality PEGylated gold NC was reported at high hydrostatic pressure and high salt concentrations. Here, we study the formation kinetics of these superlattices after pressure jumps beyond their crystallisation pressure by means of small-angle X-ray scattering with few ms experimental resolution. The timescale of NC formation was found to be reduced the larger the width of the pressure jump. This is connected to an increase of crystal quality, i.e., the faster the NC superlattice forms, the better the crystal quality. In contrast to the formation kinetics, the melting of the NC superlattice is approximately one order of magnitude slower and shows linear kinetics.

Subject Areas: Chemistry


Instruments: I22-Small angle scattering & Diffraction