Origin of Pressure-Dependent Adhesion in Nanoscale Contacts

• DOI: 10.1021/acs.nanolett.2c02016
• Publication Date: 2022-07-06T19:47:42Z
• Authors: Andrew J. Baker; Sai Bharadwaj Vis...; Rimei Chen; Ashlie Martini; Tevis D. B. Jacobs
• Keywords: Contact area

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 reveal the underlying mechanism for this as a change mode of separation. Analyzing 135 tests on technologically relevant materials anatase TiO2, silicon, diamond, demonstrate transition from fracture-controlled strength-controlled When fracture models are incorrectly applied, they yield 7-fold apparent work adhesion; however, show that true is unchanged loading. Instead, governed by product adhesive strength contact area; pressure dependence arises because area increases load. By revealing separation loaded contacts, these findings provide guidance tailoring applications nanoprobe-based manufacturing nanoparticle catalysts.