Seminar Announcement, 11/14/2017
Levich Institute Seminar Announcement, 11/14/2017
Tuesday, 11/14/2017
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Elisa Riedo
CUNY Advanced Science Research Center

"Harnessing Forces and Heat to Study and Pattern Atomic Interfaces"

ABSTRACT


The ability to understand and harness forces and heat at the nanoscale opens up a variety of possibilities for investigating the interaction between atomic interfaces, from graphene-graphene Van der Waals interaction to the interaction between a solid surface and a one-molecule-thick film of water. The focus of my laboratory is to study elasticity [1], friction, and viscoelasticity [2] at atomic solid-solid and solid-liquid interfaces by combining forces and heat in innovative atomic force microscopy methods. In this seminar, I will first present our novel sub-Ĺ-resolution indentation measurements of the perpendicular-to-the-plane inter-layer elasticity of a-few-layers thick graphene and graphene oxide films [1]. Interestingly, we find that the perpendicular Young’s modulus of graphene oxide films reaches a maximum when one complete water layer is intercalated between the graphitic planes. The interlayer Van der Waals elastic coupling is particularly important since it is related to the thermal, electronic, and tribological properties of multi-layer Van der Waals films and nanotubes. Our methodology can map inter-layer coupling and intercalation in Van der Waals films as well as the radial elasticity of nanotubes, which gives rise to large dissipative forces when a nanotube slides on a surface perpendicularly to its axis, but not when it slides along its axis. In the second part of the seminar, I will present our recent results on the extremely large viscoelasticity of molecularly thin water films, and I will discuss the interplay between viscosity, wettability, and slip in interfacial water flow [2]. Finally, I will briefly overview the capabilities of thermo-chemical Scanning Probe Lithography [3], tc-SPL, invented in our laboratory at GT for patterning high performance electrodes on 2D layers, for grey-scale chemical nanopatterning and for spintronics applications.

BRIEF ACADEMIC/EMPLOYMENT HISTORY

Professor Elisa Riedo received her Ph.D. in Physics in a joint program between the University of Milano and the European Synchrotron Radiation Facility in Grenoble, France. She then worked for three years as Post Doc at the École Polytechnique Fédérale de Lausanne (EPFL). In 2003 she was hired as Assistant Professor at the Georgia Institute of Technology, where she was promoted to Associate Professor with tenure in 2009 and to full Professor in 2015. Since Fall 2015, she is a Nanoscience Professor at the new CUNY Advanced Science Research Center (ASRC), as well as a Physics Professor at the City College of New York. She is a Fellow of the American Physical Society. www.picoForceLab.org



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