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Quantifying the Pressure-dependence of Work of Adhesion in Silicon-Diamond Contacts

Chen, Rimei and Vishnubhotla, Sai Bharadwaj and Khanal, Subarna R. and Jacobs, Tevis D. B. and Martini, Ashlie (2020) Quantifying the Pressure-dependence of Work of Adhesion in Silicon-Diamond Contacts. Applied Physics Letters, 116 (5). 051602. ISSN 1077-3118

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Continuum mechanics models for contacting surfaces assume a constant interfacial energy, or work of adhesion, between materials. Recent studies have challenged this assumption, instead demonstrating that stress-dependent chemical reactions across the interface modify the work of adhesion. Here, we perform 77 adhesion tests on diamond-silicon contacts using in situ TEM and atomistic simulations to quantify how the adhesion changes as a function of applied pressure. The results show a 7-fold increase in work of adhesion (from approximately 1 to 7 J/m2) with an increase in mean applied pressure from 0 to 11 GPa, where the most significant increase occurs above 5 GPa. We rule out alternative explanations for the changing work of adhesion, such as electron-beam artifacts, bulk shape change by inelastic deformation, and time-dependent processes such as creep. Therefore, these results confirm the presence of stress-driven chemical reactions in the contact and quantify the resulting change in adhesion of these materials with applied pressure.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Vishnubhotla, Sai Bharadwajsav40@Pitt.edusav40
Khanal, Subarna R.srk68@Pitt.edusrk68
Jacobs, Tevis D. B.tjacobs@Pitt.edutjacobs0000-0001-8576-914X
Date: 3 February 2020
Date Type: Publication
Journal or Publication Title: Applied Physics Letters
Volume: 116
Number: 5
Publisher: AIP Publishing
Page Range: 051602
DOI or Unique Handle: 10.1063/1.5127533
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
Uncontrolled Keywords: Work of adhesion, Nanocontacts, In situ TEM, Molecular dynamics simulation
ISSN: 1077-3118
Official URL:
Article Type: Research Article
Date Deposited: 17 Feb 2020 17:36
Last Modified: 17 Feb 2020 17:36


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