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UID:20250625T070337EDT-6986H9FwxV@132.216.98.100
DTSTAMP:20250625T110337Z
DESCRIPTION:Abstract:\n\nFor the past century and more\, physical chemists 
 and chemical physicists have sought to understand chemical reactivity in t
 erms of underlying physical processes. This fruitful connection has led to
  great breakthroughs in conceptual understanding and practical application
  for fostering and controlling chemical reactions. Here\, we examine how t
 he physical principles of solid mechanics and topological physics can infl
 uence surface chemistry.\n\nMechanochemistry: The field of mechanochemistr
 y is presently experiencing a renaissance. The governing hypothesis of thi
 s field is that force and stress (delivered by adjacent materials) can ope
 n novel avenues of chemical reactivity. In this context\, we recently deve
 loped methodologies to relate applied pressure to molecular chemical trans
 formations. More recently\, we have examined the chemical consequences of 
 bending nanomaterials. This deformation rearranges electronic states spati
 ally\, creating new opportunities for chemical reaction. Following this pa
 radigm\, we demonstrated that molecules bonded to curved graphene will def
 initively move\, with the direction of movement controlled by the sign of 
 the curvature and the type of molecular bonding. We also explored the stra
 in-driven water decomposition on graphene as a model system to investigate
  the influence of mechanical distortions on 2D materials.\n\nTopological p
 hysics: Over the past twenty years\, physicists have come to appreciate th
 at the band structures of crystals can have different connectivities in mo
 mentum space\, and some of these connectivities (“topologically nontrivial
 ”) are not adiabatically connected to isolated connections of atoms or mol
 ecules. Thus\, in some deep ways\, the band topology encodes the nature of
  the chemical bonding in materials\, leading to novel\, potentially chemic
 ally active\, edge states. In this area\, we predicted novel topological b
 and features\, which have been experimentally realized. More recently\, we
  have developed theoretical insights into how specific topological surface
  behaviors can be related to catalytic enhancements of energy-relevant che
 mical reactions.\n\nThese findings provide new avenues for the manipulatio
 n of molecular motions and chemical interactions via mechanical deformatio
 ns of various two-dimensional materials and the exploration of surfaces in
  topologically novel materials\, broadening the palette of physical phenom
 ena that can beneficially impact surface chemical reactivity.\n\nThe autho
 rs acknowledge the support of the NSF through grant CHE-2303044 and the DO
 E through grant DE-SC0024942\, as well as computational support from NERSC
 .\n\n \n\nBio:\n\nAndrew M. Rappe is Blanchard Professor of Chemistry and 
 Professor of Materials Science and Engineering at the University of Pennsy
 lvania. He received his A.B. in “Chemistry and Physics” summa cum laude fr
 om Harvard University in 1986\, and his Ph.D. in “Physics and Chemistry” f
 rom MIT in 1992. He was an IBM Postdoctoral Fellow at UC Berkeley before s
 tarting at Penn in 1994.\n\nAndrew received an NSF CAREER award in 1997\, 
 an Alfred P. Sloan Research Fellowship in 1998\, and a Camille Dreyfus Tea
 cher-Scholar Award in 1999. He was named a Fellow of the American Physical
  Society in 2006.\n\nRappe was named Weston Visiting Professor at the Weiz
 mann Institute of Science in 2014\, and Ziqiang Professor at Shanghai Univ
 ersity in 2016. He was awarded the Humboldt Research Award in 2017 and the
  Cheney Fellowship at University of Leeds in 2018.\n\nAndrew is one of two
  founding co-directors of the VIPER honors program at Penn\, the Vagelos I
 ntegrated Program in Energy Research.\n\nAndrew has published more than 30
 0 peer-reviewed articles. In recent years\, he has become a leader in the 
 theory of hybrid organic-inorganic perovskites and of topological material
 s. He has championed the use of the bulk photovoltaic effect for solar ene
 rgy harvesting\, and he has made seminal contributions to the theory of fe
 rroelectric materials and to topological physics. In the field of electroc
 hemistry\, Rappe studies how nonstoichiometric surfaces\, smart material s
 ubstrates\, and anomalous light-matter interactions yield electrocatalysts
  with breakthrough activity and selectivity for hydrogen evolution\, oxyge
 n evolution\, and CO2 reduction reactions.\n
DTSTART:20250114T180000Z
DTEND:20250114T193000Z
LOCATION:OM 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\, 
 801 rue Sherbrooke Ouest
SUMMARY:Chemical Society Seminar: Andrew Rappe- Stretching the limits of su
 rface reactivity: mechanochemistry and topological catalysis
URL:/chemistry/channels/event/chemical-society-seminar
 -andrew-rappe-stretching-limits-surface-reactivity-mechanochemistry-and-36
 0680
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