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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 03 March 2011
(at 13:00 in room 115, Hallwachsstr. 3)
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Lithographically-Patterned, Self-Assembling Devices and Materials

David Gracias

Department of Chemical and Biomolecular Egineering
Johns Hopkins University, Baltimore

Optical and electron beam lithography allow precise patterning on the micro-nanoscale; these paradigms are routinely utilized to construct a variety of electronic, optical and biomedical devices in two (and quasi-three) dimensions. In this talk, I will describe strategies that utilize lithographic multilayer patterning to construct 2D structures that self-assemble and show chemically-responsive functionality. Specifically, I will describe the construction of 3D patterned polyhedral structures with sizes ranging from the nanoscale to the millimeter scale; and give examples of their utilization in electronics, optics and biomedical engineering. I will also describe strategies to reconfigure these structures when exposed to specific chemicals toward the construction of autonomous and Micro Chemo-Mechanical Systems (MCMS). I will discuss lithographically patterned and chemically responsive microgrippers. As opposed to electrical or pneumatic signals typically used to actuate conventional microtools; these grippers close and open in when exposed to specific chemicals such as proteases, which are disease markers (without the need for any batteries, tethers or wiring). The grippers were utilized to pick-and-place objects and to enable an in vitro surgical biopsy towards the ultimate goal of creating an autonomous micro surgeon.

Brief Bio:

David Gracias is an Associate Professor in the Departments of Chemical and Biomolecular Engineering, Chemistry and Institute for Nanobiotechnology at The Johns Hopkins University. He did his undergraduate degree at IIT Kharagpur, Ph.D. at the University of California at Berkeley and was a post-doctoral fellow at Harvard prior to starting his independent laboratory at Johns Hopkins in 2003. He is an author on 111 reviewed publications including 70 journal articles and 20 issued patents. His research interests lie in the fields of micro and nanotechnology, surface science, metamaterials, complex systems, nanoelectronics, nanomedicine, regenerative medicine, drug delivery and microfluidics. Notable awards include the Humboldt Fellowship for experienced researchers, US National Institutes of Health Director's New Innovator Award, US National Science Foundation Career Award, DuPont Young Professor Award, Beckman Young Investigator Award and Camille-Dreyfus Teacher Scholar Award.

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.10.02 Sat
author: webadmin