Pradeep Guduru
James R. Rice Associate Professor of Engineering:
Division of Engineering
Phone: +1 401 863 3362
Phone 2: +1 401 863 7316
Pradeep_Guduru(-at-)Brown(-dot-)edu
Professor Guduru's research focusses on several aspects of Experimental Mechanics, with emphasis on phenomena at micro and nano length scales. The current active areas of research are: biologically inspired contact mechanics, adhesion and friction; developing nanofabrication strategies by means of guided self assembly using electric and magnetic fields; mechanics of carbon nanotubes: experiments and modeling; and mechanical behavior of biological tissues; and mechanics of energy storage materials.
Biography
Pradeep Guduru received Bachelor's degree in Mechanical Engineering from Sri Venkateswara University (Tirupati, India) and Master's degree in Aerospace Engineering from Indian Institute of Science (Bangalore, India). He received his PhD in Aeronautics from California Institute of Technology in 2001. Subsequently he joined the Division of Engineering at Brown University as a postdoctoral research associate and was appointed as an assistant professor of Engineering in 2002. He has been an associate professor of Engineering since 2008 and the James R. Rice Associate Professor of Engineering since January 2009.
Interests
Mechanics of Biologically Inspired Adhesion, Friction and Engineered Surfaces:
The ability of small animals such as insects, flies and geckos to climb up vertical walls and to walk up side down on ceilings has been a subject of active research in biology for many centuries. There are a variety of mechanisms employed by these animals, including tiny claws, adhesive secretions, smooth and hairy adhesive pads, etc. Following the accumulation of a large body of anatomical and functional data on various natural adhesion systems, in the last few years biologists and engineers have been working together to develop a quantitative understanding of various natural adhesion and friction systems. This is a growing field of research with a rich set of challenging problems at the interface between biology, applied mechanics and micro/nano-fabrication, with potentially significant benefits if we can understand and mimic some of nature's optimized solutions to develop useful technologies.
The focus of this research is on engineering the topography of surfaces at micron and nano scale in order to understand the mechanics of biological adhesion and friction systems; and to develop biomimetic strategies which implement nature's mechanisms for adhesion and friction. Such a study naturally leads to several basic mechanics problems in rough surface adhesion and friction of soft materials, which are currently being investigated in detail. Some of the specific problems being addressed are: Mechanics of direction dependent friction (Friction Anisotropy) exhibited by biological surfaces and implementing such strategies on laboratory surfaces; Mechanics of roughness induced instabilities at nano and micron scales; Optimal design and fabrication of nano-hairy surfaces. The common features that underlie this class of problems are fabrication of nano-structuree surfaces, coupling between adhesion and deformation of the surface nano-structures, and mechanical instabilities at nano and micron scale to dissipate energy and influence the macroscopic behavior. The key idea is to manipulate surface topography at nano and micron scale to tailor macroscopic adhesion and friction properties; not surface chemistry. This work is supported by the Air Force Office of Scientific Research and the National Science Foundation.
Nanofabrication Strategies by means of Guided Assembly:
Fabricating ordered patterns of controlled shape, size and spacing at nanoscale has been an important goal of nano-scale science and engineering during the past decade. Applications envisaged for such processes include quantum dot devices, nanocomposites, high density data storage devices, etc. Most of the existing nanofabrication techniques can be loosely described as either top-down type or bottom-up type. The top-down approach consists of examples such as photolithography, X-ray lithography, scanning probe/e-beam lithography etc. On the other hand, in the bottom-up approach, one tries to exploit certain configurational forces acting at nanoscale to drive a self-assembly process. However, there are a number of issues associated with the "self-assembly" route of fabricating devices of practical utility. For example, in case of strain driven quantum dot growth in semiconductor thin films, the resulting nanostructures usually do not possess any spatial order and also end up with a non-uniform size distribution. The objective of this project is to develop nanofabrication techniqes that combine the driving configurational forces that underlie self-assembly processes and the spatial control that can be achieved in top-down processes, in order to realize any desired spatial pattern and size distribution of nanostructures. Currently, we are exploring the use of "very strong" electric and magnetic fields at solid surfaces to induce diffusion and patterning. This work is supported by the National Science Foundation.
Mechanics of Carbon Nanotubes:
Research on the mechanics of carbon nanotubes has been dominated by modeling and computational simulations, primarily due to the extreme difficulty involved in performing controlled experiments on such small structures. The goal of this project is to develop new nanoscale experimental techniques to apply controlled force on individual nanotubes, measure the deflection at nanometer resolution and develop mechanics models to describe the experimental observations. We have recently developed an experimental technique to study shell buckling in individual multiwalled carbon nanotubes and showed that the measured buckling force is substantially higher than that predicted by the existing models. Motivated by these experimental observations, improved shell theories are being developed. This work is currently supported by Brown University.
Degrees
PhD
Awards
James R. Rice Associate Professor, January 2009.
PECASE - Presidential Early Career Award for Scientists and Engineers, 2007.
National Science Foundation CAREER Award to pursue research on Biologically Inspired Contact Mechanics, 2006.
William F. Ballhaus prize for outstanding doctoral dissertation in Aeronautics, Caltech, 2001.
Ernest E. Sechler Memorial Award for the most significant contributions to teaching and research in Aeronautics, Caltech, 1998.
Donald W. Douglas fellowship, Graduate Aeronautical Laboratories, Caltech, 1994-95.
Recipient of "Senate Commendation" for academic excellence, Indian Institute of Science, 1994.
Jayant Dalal scholarship and Ivaturi prize for the best academic performance, Sri Venkateswara University, 1991 and 1992.
Affiliations
Society for Experimental Mechanics
American Society of Mechanical Engineers
Adhesion Society
Materials Research Society
Electrochemical Society
Teaching
See the CV.
Funded Research
Funding sources: National Science Foundation; Air Force Office of Scientific Research; Office of Naval Research; National Institute of Health.
Contact Prof. Guduru for more details.
