NANOMECHANICS AND MATERIALS RESEARCH LABORATORY

Nanoscale Contact Mechanics and Adhesion

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Nanoscale adhesion and friction experiments provide important about the role of van der Waals forces in the macroscopic response of nanomaterials. We have developed methods and microscale tools, Figure (a), in the past to measure contact adhesion between individual Polyacrylonitrile (PAN) nanofibers, fabricated via electrospinning, under normal and shear loading capturing for the first time the stick-slip instabilities due to van der Waals forces between two PAN nanofibers, Figure (b), and measuring the critical stress for shear detachment for a variety of fiber diameters and applied normal forces, Figure (c). These results are of major importance to our current studies of nanofiber networks and their microstructural evolution under macroscopic stretching.

Furthermore, we have studied the adhesion of carbon nanofibers and multi-wall carbon nanotubes to polymeric and carbon matrices, which provided important insights into the origins of macroscale mechanical strength and stiffness of polymer matrix nanofiber composites and advanced carbon fibers with embedded carbon nanotubes. See the publications below for more details.


(a)


(b)


(c)

                                                                                                 Related Publications

  1. D. Das and I. Chasiotis, “Rate Dependent Adhesion of Nanoscale Polymer Contacts,” Journal of the Mechanics and Physics of Solids 156, pp. 104597, (2021).

  2. D. Das, I. Chasiotis, “Sliding of Adhesive Nanoscale Polymer Contacts,” Journal of the Mechanics and Physics of Solids 140, pp. 103931, (2020).

  3. K. Şahin, N.A. Fasanella, I. Chasiotis, K.M. Lyons, B.A. Newcomb, M.G. Kamath, H.G. Chae, S. Kumar, “High strength micron size carbon fibers from polyacrylonitrile–carbon nanotube precursors”, Carbon 77, pp. 442–453 (2014).

  4. Ozkan, Q. Chen, and I. Chasiotis, “Interfacial Strength and Fracture Energy of Individual Carbon Nanofibers in Epoxy Matrix as a Function of Surface Conditions”, Composites Science and Technology 72, pp. 965-975, (2012).
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