Mechanical Engineering Faculty Candidate Seminar
|Event Date:||March 14, 2014|
|Speaker:||Dr. Jonathan R. Felts|
|Speaker Affiliation:||Postdoctoral Researcher
Naval Research Laboratory
|Sponsor:||School of Mechanical Engineering|
|Contact Name:||Cynthia Dalton
This talk presents controlled fabrication and chemical identification of polymer nanostructures using heated atomic force microscope (AFM) cantilevers. Polymer nanostructures are fabricated using thermal dip pen nanolithography (tDPN), and are characterized using atomic force microscope infrared spectroscopy (AFM-IR). We investigate the nanometer-scale polymer transport between the tip and surface by controlling tip temperature and substrate temperature to understand the effect of capillary forces. We find that thermal Marangoni forces and non-equilibrium wetting in competition with viscous forces govern polymer flow. We use AFM-IR to chemically identify various homogeneous and heterogeneous polymer nanostructures with spatial resolution less than 100 nm and for structures with heights ~15 nm. The ability to both control chemical patterning and analyze chemical composition at the nanometer scale provides a framework for designing and understanding increasingly complex chemical nanostructures for use in next generation nano-devices.
Jonathan Felts earned a BS degree in mechanical engineering from Georgia Tech in 2008. He received his MS and PhD in ME at UIUC under the advisement William King for work on tip-based nanomanufacturing and nanometrology of chemical nanostructures. He was the recipient of the Eugene and Lina Abraham Endowed PhD Fellowship and the Department of Energy Office of Science Graduate Fellowship during his PhD studies, and he was recently awarded a National Academy of Science Postdoctoral Fellowship at the Naval Research Lab. His future research interests are in the field of active MEMS/NEMS devices for advanced manufacturing by utilizing multiphysical phenomena at small scales.
Faculty Host: Professor Lia Stanciu, Materials Engineering