Baker, Andrew and Vishnubhotla, Sai and Chen, Amanda and Martini, Ashlie and Jacobs, Tevis
(2022)
The Origin of Pressure-Dependent Adhesion in Nanoscale Contacts.
[Dataset]
(In Press)
Abstract
The adhesion between nanoscale components has been shown to increase with applied load, contradicting well-established mechanics models. Here we use in situ transmission electron microscopy and atomistic simulations to reveal the underlying mechanism for this increase as a change in the mode of separation. Analyzing more than 135 nanoscale adhesion tests on technologically relevant materials of anatase TiO2, silicon, and diamond, we demonstrate a transition from fracture-controlled to strength-controlled separation. When fracture models are incorrectly applied, they yield a seven-fold increase in apparent work of adhesion; however, we show that the true work of adhesion is unchanged with loading. Instead, the nanoscale adhesion in these contacts is primarily governed by the product of adhesive strength and contact area, with the latter increasing under applied load. These results demonstrate the mechanism of separation for loaded nanoscale contacts, and therefore provide guidance for tailoring adhesion in applications from nanoprobe-based manufacturing to nanoparticle catalysts.
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