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Atomic insight into hydration shells around facetted nanoparticles

DOI: 10.1038/s41467-019-09007-1 DOI Help

Authors: Sabrina L. J. Thoma (University of Bayreuth) , Sebastian W. Krauss (University of Bayreuth) , Mirco Eckardt (University of Bayreuth) , Phil Chater (Diamond Light Source) , Mirijam Zobel (University of Bayreuth)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 10

State: Published (Approved)
Published: March 2019
Diamond Proposal Number(s): 17345

Open Access Open Access

Abstract: Nanoparticles in solution interact with their surroundings via hydration shells. Although the structure of these shells is used to explain nanoscopic properties, experimental structural insight is still missing. Here we show how to access the hydration shell structures around colloidal nanoparticles in scattering experiments. For this, we synthesize variably functionalized magnetic iron oxide nanoparticle dispersions. Irrespective of the capping agent, we identify three distinct interatomic distances within 2.5 Å from the particle surface which belong to dissociatively and molecularly adsorbed water molecules, based on theoretical predictions. A weaker restructured hydration shell extends up to 15 Å. Our results show that the crystal structure dictates the hydration shell structure. Surprisingly, facets of 7 and 15 nm particles behave like planar surfaces. These findings bridge the large gap between spectroscopic studies on hydrogen bond networks and theoretical advances in solvation science.

Journal Keywords: Characterization and analytical techniques; Chemical physics; Colloids; Structure of solids and liquids; Surfaces, interfaces and thin films

Subject Areas: Chemistry


Instruments: I15-1-X-ray Pair Distribution Function (XPDF)

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s41467-019-09007-1.pdf