Woodruff School of Mechanical Engineering
Controlling Heat and Light at Nanoscale Interfaces with Structure, Chemistry and Biology
Prof. Patrick E. Hopkins
University of Virginia, Mechanical and Aerospace Engineering
Thursday, October 15, 2020 at 11:00:00 AM
Dr. Satish Kumar
The thermal conductivity of a material is the material property that dictates how energy is transferred, thus dictating the temperature rise a material experiences subjected to an incident heat flux. While many of us are quite familiar with the thermal conductivity of a material, the thermal boundary conductance across material interfacial regions is much less frequently studied. The thermal boundary conductance TBC, the inverse of which is the thermal boundary resistance, represents the thermal resistance associated with the interfacial region between two materials. The ability to control TBC gives the unique ability to control temperature at and near interfaces, offering an approach to manipulate material properties that are sensitive to temperature rises. In this talk, I will discuss our recent work in using chemically modified or reactive materials and interfaces to control the phonon scattering rates, electron phonon interaction, and plasmonic absorption through the following examples: Chemistry and structure to realize ultrahigh thermal conductances across nanoscale interfaces across a range of 2D materials, amorphous films and single crystal wide bandgap materials. Measuring the electron-phonon interactions in metal films and interfaces. Controlling infrared plasmon absorption with the electron-phonon interaction. Heat transport mechanisms in functional organic materials: MOFs, COFs, and organic/inorganic hybrid thin films. 6 Creating nanomaterials from squid ring teeth protein that can act as thermal conductivity switches based on the interaction with water.
Patrick E. Hopkins is a Professor in Department of Mechanical and Aerospace Engineering at the University of Virginia. Patrick received his Ph.D. in Mechanical and Aerospace Engineering at the University of Virginia in 2008. After his Ph.D., Patrick was one of two researchers in the nation to receive a Truman Fellowship from Sandia National Laboratories in 2008. Under this Fellowship, Patrick worked at Sandia in Albuquerque, NM from 2008 to 2011 developing novel laser-based diagnostics to measure temperature and energetic processes in solid nanosystems and across interfaces adjacent to solid and liquids. In 2011, Patrick returned to the University of Virginia as an Assistant Professor, and was promoted to Associate Professor with Tenure in 2015. His current research interest are in energy transport, charge flow, laser-chemical processes and photonic interactions with condensed matter, soft materials, liquids, vapors and their interfaces. Patrick has authored or co-authored over 240 technical papers and been awarded 4 patents focused on materials, energy and laser metrology. Patrick has been recognized for his accomplishments in these fields via an Air Force Office of Scientific Research Young Investigator Award, an Office of Naval Research Young Investigator Award, the ASME Bergles Rohsenhow Young Investigator Award in Heat Transfer, and a Presidential Early Career Award for Scientists and Engineering, for which Patrick met President Barack Obama in 2016.
Oct 15 11-12 pm
Eastern Time Seminar Link: https://gatech.bluejeans.com/867407167 Phone Dial-in +1.408.419.1715 Meeting ID: 867 407 167 - Moderator: Satish Kumar (firstname.lastname@example.org)