Structuring of colloidal silica nanoparticle suspensions near water-silica interfaces probed by specular neutron reflectivity

Physical Chemistry Chemical Physics : PCCP
Plinio MaroniMichal Borkovec

Abstract

Structuring of aqueous suspensions of colloidal silica nanoparticles near an isolated planar silica-water interface is studied by specular neutron reflectivity. The reflectivity data clearly show that the suspensions develop a damped, oscillatory concentration profile in the normal direction to the interface. The wavelengths of these oscillations agree well with those independently determined by direct force measurements in the slit-geometry. The reflectivity data further demonstrate that the oscillatory structure persists over several layers and that the first particle layer is separated from the interface by a particle-free region.

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Citations

Dec 29, 2020·Physical Chemistry Chemical Physics : PCCP·Michael Ludwig, Regine von Klitzing
Jun 18, 2021·Proceedings of the National Academy of Sciences of the United States of America·Chrystian OchoaVivek Sharma
Nov 18, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Liam R J ScarrattMichal Borkovec

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Methods Mentioned

BETA
force measurements
X-ray
transmission
atomic force microscopy
electrophoretic light scattering
dynamic light scattering
AFM
quartz crystal microbalance
force

Software Mentioned

Motofit

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