Bouncing of Hydroxylated Silica Nanoparticles: an Atomistic Study Based on REAX Potentials

Clean silica surfaces have a high surface energy. In consequence, colliding silica nanoparticles will stick rather than bounce over a wide range of collision velocities. Often, however, silica surfaces are passivated by adsorbates, in particular water, which considerably reduce the surface energy. W...

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Bibliographic Details
Published in:Nanoscale research letters 2020-03, Vol.15 (1), p.67-67, Article 67
Main Authors: Nietiadi, Maureen L., Rosandi, Yudi, Urbassek, Herbert M.
Format: Article
Language:English
Subjects:
Adsorbates
Bouncing
Chemistry and Materials Science
Clean energy
Cluster collisions
Collisions
Hydroxylation
Materials Science
Molecular dynamics
Molecular Medicine
Nano Express
Nanochemistry
Nanoparticles
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
Silica
Silicon dioxide
Surface energy
Surface properties
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Summary:Clean silica surfaces have a high surface energy. In consequence, colliding silica nanoparticles will stick rather than bounce over a wide range of collision velocities. Often, however, silica surfaces are passivated by adsorbates, in particular water, which considerably reduce the surface energy. We study the effect of surface hydroxylation on silica nanoparticle collisions by atomistic simulation, using the REAX potential that allows for bond breaking and formation. We find that the bouncing velocity is reduced by more than an order of magnitude compared to clean nanoparticle collisions.
ISSN:1931-7573
1556-276X
1556-276X
DOI:10.1186/s11671-020-03296-y