BEGIN:VCALENDAR VERSION:2.0 PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4// BEGIN:VEVENT UID:20251109T160558EST-3454TVOgEA@132.216.98.100 DTSTAMP:20251109T210558Z DESCRIPTION:Control of friction and wear is a ubiquitous challenge in numer ous machined interfaces ranging from biomedical implants\, to engines\, to nano- and micro-scaled electromechanical systems (MEMS) devices. Control of friction is also essential to reducing energy waste.1 Central to develo ping boundary lubrication schemes for such applications is how to reduce w ear at the rough surfaces of such surfaces\, where nanoscaled asperities d ominate the interfacial contacts that can lead to wear. The robust mechani cal properties and general chemical inertness of two-dimensional (2D) nano materials\, such as graphene and MoS2\, has made them of interest as frict ion modifiers. While single layer graphene and MoS2 can readily adapt to s urface structure on the atomic scale\, when deposited on substrates with n anoscopic roughness of ~ 10 nm rms (as is common in many machined interfac es) a conformal coating generally cannot be fully formed\, due to competit ion between adhesion to the substrate nanoscopic asperities and the bendin g rigidity of the material.2\,3 This often leaves a mixture of supported a nd unsupported regions which respond differently to applied load\, with sp atial variations in mechanical properties and chemical bonding. Modificati on of the frictional properties may also be tuned by controlling substrate interactions using self-assembled monolayers.4\,5 It has also been observ ed that increased strain in these materials on rough surfaces has also bee n seen to increase their chemical reactivity.6 This has recently led us to examine force-driven chemical reactions with graphene as a model approach to understanding mechanochemical reactions at surfaces. Here\, we describ e a combination of AFM nanomechanical\, confocal Raman microspectroscopic and near-field IR scattering studies of graphene and MoS2 on silica surfac es with controlled nanoscopic roughness\, to examine the how this impacts their frictional properties\, and alters their electronic properties and c hemical reactivity\, where strain dependent reactions can be driven by app lied forces. Studies of MoS2 on metal surfaces\, such as Au(111) will also be described\, where even within single layer MoS2\, varying phases of th e MoS2 are found to occur.7\n\n \n\n1. J.C. Spear\, B.W. Ewers and J.D. Ba tteas\, “2D-Nanomaterials for Controlling Friction and Wear at Interfaces\ ,” 10 Nano Today (2015) 301-314.\n\n \n\n2. M.B. Elinski\, Z. Liu\, J.C. S pear and J.D. Batteas\, “2D or not 2D? The impact of Nanoscale Roughness a nd Substrate Interactions on the Tribological Properties of Graphene and M oS2\,” J. of Phys. D: Appl. Phys. 50 (2017)103003.\n\n \n\n3. J.C. Spear\, J.P. Custer and J.D. Batteas\, “The Influence of Nanoscale Roughness and Substrate Chemistry on the Frictional Properties of Single and Few Layer G raphene\,” Nanoscale 7 (2015) 10021-10029.\n\n \n\n4. M.B. Elinski\, B.D. Menard\, Z. Liu and J.D. Batteas\, “Adhesion and Friction at Graphene/Self -Assembled Monolayer Interfaces Investigated by Atomic Force Microscopy\,” J. Phys. Chem. C 121 (2017) 5635-5641.\n\n \n\n5. M. Negrito\, M.B. Elins ki\, N. Hawthorne\, M.P. Pedley\, M. Han\, M. Sheldon\, R.M. Espinosa-Marz al\, and J.D. Batteas\, “Using Patterned Self-Assembled Monolayers to Tune Graphene-Substrate Interactions\,” Langmuir 37 (2021) 9996-10005.\n\n \n \n6. S. Raghuraman\, M. B. Elinski\, J. D. Batteas and J. R. Felts. “Drivi ng Surface Chemistry at the Nanometer Scale Using Localized Heat and Stres s\,” Nano Lett. 17 (2017) 2111-2117.\n\nBio:\n\nDr. James Batteas is the D . Wayne Goodman Professor of Chemistry and Professor of Materials Science and Engineering at Texas A&M University (TAMU). He earned a B.S. in Chemis try at the University of Texas at Austin in 1990 and a Ph.D. in Chemistry from the University of California at Berkeley in 1995. He is an expert in materials chemistry of surfaces and interfaces\, with research activities spanning a broad range of fundamental surface and interfacial phenomena. T hese include studies of charge transport in organic molecular assemblies o n surfaces\, measured by scanning tunneling microscopy (STM) and modeled b y density functional theory (DFT)\, nanoparticle catalysis\, plasmonics\, tribology\, “smart” surfaces\, and self-organizing nanoscale materials for device applications in optoelectronics and chemical sensing. His research in tribology focuses on the bridge between chemistry and mechanics\, were his lab conducts atomic force microscopy (AFM) studies of atomic scale fr iction and wear of oxides and 2D nanomaterials. He had recently extended t his work into fundamental studies of mechanochemistry and directs the new NSF Center for the Mechanical Control of Chemistry. He has been recognized twice by TAMU for excellence in teaching\, receiving Association of Forme r students Distinguished Teaching awards at both the college and universit y levels. He was elected a Fellow of the Royal Society of Chemistry in 201 2 and is an Editorial Board Member of RSC Advances and sits on the Editori al Advisory Board of ACS Central Science. \n\n7.F. Wu\, Z. Liu\, N. Hawtho rne\, M. Chandross\, Q. Moore\, N. Argibay\, J. Curry and J.D. Batteas\, “ Formation of Coherent 1H-1T Heterostructures in Single Layer MoS2 on Au(11 1)\,” ACS Nano 14 (2020) 16939-16950.\n DTSTART:20210923T181500Z DTEND:20210923T191500Z LOCATION:Ruttan Room rm 321\, Maass Chemistry Building\, CA\, QC\, Montreal \, H3A 0B8\, 801 rue Sherbrooke Ouest SUMMARY:Prof. James D. Batteas: Studies of Friction and the Mechanochemical Reactivity of 2D Nanomaterials URL:/chemistry/channels/event/prof-james-d-batteas-stu dies-friction-and-mechanochemical-reactivity-2d-nanomaterials-333591 END:VEVENT END:VCALENDAR