journal article·2018-12-26Open access

Friction and Adhesion of Different Structural Defects of Graphene

Manoj Tripathi, Firas Awaja, Rafael A. Bizao, Stefano Signetti, Erica Iacob, Guido Paolicelli, Sergio Valeri, Alan Dalton, Nicola Maria Pugno

ACS Applied Materials & Interfaces· Volume 10· Issue 51

Abstract

Graphene structural defects, namely edges, step-edges, and wrinkles, are susceptible to severe mechanical deformation and stresses under tribo-mechanical operations. Applied forces may cause deformation by folding, buckling, bending, and tearing of these defective sites of graphene, which lead to a remarkable decline in normal and friction load bearing capacity. In this work, we experimentally quantified the maximum sustainable normal and friction forces, corresponding to the damage thresholds of the different investigated defects as well as their pull-out (adhesion) forces. Horizontal wrinkles (with respect to the basal plane, i.e., folded) sustained the highest normal load, up to 317 nN, during sliding, whereas for vertical (i.e., standing) wrinkles, step-edges, and edges, the load bearing capacities are up to 113, 74, and 63 nN, respectively. The related deformation mechanisms were also experimentally investigated by varying the normal load up to the initiation of the damage from the defects and extended with the numerical results from molecular dynamics and finite element method simulations.
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Research context

OpenAlex topics: Force Microscopy Techniques and Applications · Graphene research and applications · Carbon Nanotubes in Composites

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Mathematics and Physical Sciences, University of Sussex, Brighton BN1 9RH, United Kingdom

Department of Orthopaedic Surgery, Medical University Innsbruck, Innrain 36, Innsbruck, Austria

Laboratory of Bio-Inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, via Mesiano 77 I-38123 Trento, Italy

Department of Mechanical Engineering, Korea Advanced institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea

Centre for Materials and Microsystems, Fondazione Bruno Kessler, via Sommarive 18, I-38123 Trento, Italy

Istituto Nanoscienze, Consiglio Nazionale delle Ricerche, via G. Campi 213/a, 41125- Modena, Italy

Dipartimento di Scienze Fisiche Informatiche e Matematiche (FIM), Università di Modena e Reggio Emilia, via Campi 213/a, I-41125 Modena, Italy

School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, E1 4NS London United Kingdom

Ket Lab, Edoardo Amaldi Foundation, via del Politecnico snc, I-00133 Roma, Italy

Funding

Ministero dell?Istruzione, dell?Universit? e della Ricerca · Austrian Science Fund · H2020 Future and Emerging Technologies · European Cooperation in Science and Technology · Regione Emilia-Romagna

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