Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

The effect of atomic-scale roughness on the adhesion of nanoscale asperities: A combined simulation and experimental investigation

Jacobs, TDB and Ryan, KE and Keating, PL and Grierson, DS and Lefever, JA and Turner, KT and Harrison, JA and Carpick, RW (2013) The effect of atomic-scale roughness on the adhesion of nanoscale asperities: A combined simulation and experimental investigation. Tribology Letters, 50 (1). 81 - 93. ISSN 1023-8883

[img] Plain Text (licence)
Available under License : See the attached license file.

Download (1kB)


The effect of atomic-scale roughness on adhesion between carbon-based materials is examined by both simulations and experimental techniques. Nanoscale asperities composed of either diamond-like carbon or ultrananocrystalline diamond are brought into contact and then separated from diamond surfaces using both molecular dynamics simulations and in situ transmission electron microscope (TEM)-based nanoindentation. Both techniques allow for characterization of the roughness of the sharp nanoasperities immediately before and after contact down to the subnanometer scale. The root mean square roughness for the simulated tips spanned 0.03 nm (atomic corrugation) to 0.12 nm; for the experimental tips, the range was 0.18-1.58 nm. Over the tested range of roughness, the measured work of adhesion was found to decrease by more than an order of magnitude as the roughness increased. The dependence of adhesion upon roughness was accurately described using a simple analytical model. This combination of simulation and experimental methodologies allows for an exploration of an unprecedented range of tip sizes and length scales for roughness, while also verifying consistency of the results between the techniques. Collectively, these results demonstrate the high sensitivity of adhesion to interfacial roughness down to the atomic limit. Furthermore, they indicate that care must be taken when attempting to extract work of adhesion values from experimental measurements of adhesion forces. © 2013 Springer Science+Business Media New York.


Social Networking:
Share |


Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Jacobs, TDBtjacobs@pitt.eduTJACOBS0000-0001-8576-914X
Ryan, KE
Keating, PL
Grierson, DS
Lefever, JA
Turner, KT
Harrison, JA
Carpick, RW
Date: 1 April 2013
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: Tribology Letters
Volume: 50
Number: 1
Page Range: 81 - 93
DOI or Unique Handle: 10.1007/s11249-012-0097-3
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1023-8883
Date Deposited: 10 Oct 2014 15:16
Last Modified: 02 Feb 2019 15:55


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item