Announcements

CE Seminar by Mehmet Baykara

Author: Erdem Alaca
Time: 16:45
Location: ENG 208

 

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KOC UNIVERSITY

COLLEGE OF ENGINEERING

ENGINEERING SEMINAR SERIES

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Speaker: Mehmet Z. Baykara

Title: A Crash Course on Nanotribology: Atomic Force Microscopy, Nanoparticles, and Superlubricity

 

Date:  6th May ,Wednesday 2015

Time: 16:45

Place: ENG 208

Host:  Erdem Alaca

 

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Abstract:

 

Friction is a universal phenomenon that plays a major role in various technical and industrial processes. Despite its importance from both practical and scientific points of view, the fundamental physical principles that govern friction are still not well-understood. Considering that the ability to predict and control friction on the macroscopic level depends on an elementary understanding of the related mechanisms on much smaller length scales, the research field of nanotribology • the science of friction, lubrication and wear on the nanoscale • has been established about two decades ago.

 

In this talk, the principle tools and approaches associated with nanotribology will be introduced first, within the framework of a “crash course”. Special emphasis will be placed on the use of the atomic force microscope and nano-manipulation experiments performed on nanoparticles, as well as the concept of superlubricity. Following this general introduction to the subject, recent results from our research laboratory at Bilkent will be reported, obtained via controlled nano-manipulation of antimony (Sb) and gold (Au) nanoparticles on highly oriented pyrolytic graphite (HOPG) using AFM under ambient conditions. In particular, an abrupt increase in sliding shear stress associated with a structural transition from amorphous to crystalline will be discussed for Sb nanoparticles [1]. Additionally, it will be shown that nanotribology studies conducted on Au nanoparticles [2] result in remarkably low frictional forces, pointing towards the occurrence of superlubric sliding under ambient conditions, with crucial implications for the future of nanotribology research.

 

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[1]: C. Ritter, M.Z. Baykara, et al., Physical Review B 88, 045422 (2013)

 

[2]: E. Cihan, A. Özoğul, M.Z. Baykara, Applied Surface Science, in press.

 

Bio:

 

 

Mehmet Z. Baykara is an Assistant Professor at the Department of Mechanical Engineering at Bilkent University, where he is the leader of the Scanning Probe Microscopy (SPM) Research Group and is conducting research funded by the European Commission and TUBITAK.

 

He has obtained his B.S. degree in Mechanical Engineering from Boğaziçi University with high honors in 2006, and his Ph.D. degree from the Department of Mechanical Engineering & Materials Science at Yale University in 2012. His doctoral work on 3D-AFM has received awards from the Materials Research Society (MRS) and the American Vacuum Society (AVS). The associated thesis has been recognized by Yale University through the “Henry Prentiss Becton Graduate Award for Exceptional Achievement in Research”.

Dr. Baykara has co-authored publications in journals such as ACS Nano, Advanced Materials and Nature Nanotechnology and has delivered numerous invited presentations at research institutes and universities around the world. Dr. Baykara is the recipient of Mustafa Parlar, FABED Eser Tümen, TÜBA-GEBİP and BAGEP awards. He is a guest editor at the Beilstein Journal of Nanotechnology and a member of the executive committee of the NSTD division of AVS.