When:
Thursday, March 9, 2017
4:00 PM - 5:00 PM CT
Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it
Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students
Contact:
Tina Hoff
Group: Physics and Astronomy Condensed Matter Physics Seminars
Category: Academic
Title: Physics of Nanofriction from Simulation and Theory (*) (**)
Speaker: Professor Erio Tosatti, SISSA and ICTP, Trieste, Italy
Abstract: Simulations and theory can help understand and predict some physical phenomena through the mark they leave in dissipation and sliding friction at the nanoscale. Following a brief recap of the general status of the field [1,2], I will discuss some recent results obtained in our group, including vortex injiection in CDWs by a vibrating Atomic Force Microscope tip [3], incommensurate sliding and pinning-unpinning transitions in colloid monolayers [4-6], and a new Markov State Model theoretical formulation of sliding friction [7]. Other ongoing projects including friction across ionic liquids [8] and ab initio mechanochemistry will be touched upon if there is time. These and other examples suggest that nanofriction and tip dissipation can in some cases provide a sort of spectroscopic tool for the blind man.
(*) Wok done in collaboration with P.P. Baruselli, O. Brovko, R. Capozza, Y. Crespo, L. Gigli, R. Guerra, O. Hod, A. Laio, F. P. Landes, I. Leven, D. Mandelli, N. Manini, E. Panizon, F. Pellegrini, S. Prestipino, G.E. Santoro, M. Teruzzi, A. Vanossi, T. Zanca.
(**) ERC Advanced Grant No. 320796 MODPHYSFRICT
[1] Modeling friction: From nanoscale to mesoscale” A. Vanossi, e.a, Rev. Mod. Phys. 85, 529 (2013).
[2] Friction and nonlinear dynamics, N Manini, et al. J. Phys.: Condens. Matter 28, 293001 (2016).
[3] CDW slips and giant frictional dissipation peaks at the NbSe2 surface, M. Langer et al., Nature Materials 13, 173 (2014) [4] Spontaneous monolayer rotation and friction. D. Mandelli, et al., Phys. Rev. Lett. 114, 108302 (2015).
[5] 2D frictional Aubry transition in colloidal monolayers. D. Mandelli, et al.,Phys. Rev. B 92, 134306 (2015).
[6] Subharmonic Shapiro steps in sliding colloid monolayers. S. Paronuzzi et al., J.PCM 28 ,134006 (2016) [7] Markov state modeling of sliding friction, F. Pellegrini, et al.,Phys. Rev. E 94, 053001 (2016).
[8] Electrical charging effects on the sliding friction of a model nano-confined ionic liquid, R. Capozza, et al., J. Chem. Phys.142, 064707 (2015); ibid., J. Chem. Phys. 143, 144703 (2015); and to be published