Signatures of van der Waals and Electrostatic Forces in the Deposition of Nanoparticle Assemblies

The Journal of Physical Chemistry Letters
Ekhlas HomedeOfer Manor

Abstract

We evaporate aqueous suspensions in a microchamber to explore the connection between the morphology of the nanoparticle deposits at nanometer resolutions and at micrometer and hundreds of micrometers resolutions. Repulsive or weakly attractive electrical double-layer and van der Waals surface forces render the deposition of detached particles and small aggregates at nanometer resolutions. However, strongly attractive surface forces render the dense deposition of large aggregates. At greater length resolutions, the deposit morphology is further governed by evaporation-mediated transport of particles in the volatile suspension. We use experiment and theory to show that the contributions of the different mechanisms to the deposit morphology are mediated by particle coagulation and by particle adsorption to the substrate. The nanometer deposit morphology and particle transport render the morphology of the deposits at greater length resolutions, where it may take the shape of crude or smooth particulate micropatterns or continuous particulate coating layers.

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Citations

Oct 12, 2019·Soft Matter·Giovanni Li-DestriGiovanni Marletta
Oct 10, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Deepa Lohani, Subhendu Sarkar
Sep 12, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Nathalie BridonneauFlorent Carn
Dec 29, 2021·Chemical Reviews·Kyoung Won ChoDae-Hyeong Kim

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