Nanotribology, Nanomechanics and Materials Characterization Studies and Applications to Bio/Nanotechnology and Biomimetics

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Date 23.06.2022 14:0015:00  
Speaker Prof. Bharat Bhushan, Academy Professor, The Ohio State University, Columbus, OH (USA)
Location Online
Category Conferences - Seminars
Event Language English
BIOENGINEERING SEMINAR

(Talk 1/3 in a mini-series: talk 2 taking place on June 24, talk 3 on June 28, 2022)

Abstract:
At most solid-solid interfaces of technological relevance, contact occurs at numerous asperities. A sharp atomic/friction force microscope (AFM/FFM) tip sliding on a surface simulates just one such contact. However, asperities come in all shapes and sizes that can be simulated using tips of different shapes and sizes. AFM/FFM techniques are commonly used for tribological studies of engineering surfaces at scales ranging from atomic- to microscales. Studies include surface characterization, adhesion, friction, scratching/wear, boundary lubrication, electrical resistance, surface potential, and capacitance mapping1-4. AFMs and their modifications are also used for nanomechanical characterization, which includes measurement and analysis of hardness, elastic modulus and viscoelastic properties, and in-situ localized deformation studies. The experimental data exhibit scale effects in adhesion, friction, wear, and mechanical properties. Generally, coefficients of friction and wear rates on micro- and nanoscales are smaller, whereas hardness is greater. Therefore, micro/nanotribological studies may help define the regimes for ultra-low friction and near-zero wear. New lubrication strategies such as the use of self-assembled monolayers promise to be very versatile and effective at these scales.
Nanotribology and Nanomechanics of various MEMS/NEMS and BioMEMS/BioNEMS devices which require relative motion is of importance4. The scale of operation and large surface-to-volume ratio of the devices result in very high retarding forces such as friction and adhesion that seriously undermine the performance and reliability of the devices. Carbon nanotubes are being used for various nanotechnology applications. The mechanical strength and reliability of many of these devices critically relies on the nanotribology and nanomechanics of the CNTs5. There are bioadhesion issues in biosensors and other BioMEMS/BioNEMS which need to be addressed4.
Biologically inspired design, adaptation, or derivation from nature is referred to as biomimetics6. The understanding of the functions provided by objects and processes found in nature can guide us to imitate and produce nanomaterials, nanodevices, and processes6-7
These fundamental nanotribological studies provide insight to the molecular origins of interfacial phenomena including adhesion, friction, wear, and lubrication. Friction and wear of lightly loaded micro/nano components are highly dependent on surface interactions within a few atomic layers. Nanotribological and nanomechanics studies are also valuable in the fundamental understanding of interfacial phenomena in macrostructures to provide a bridge between science and engineering. This talk will present an overview of nanotribological and nanomechanics studies and their applications to bio/nanotechnology and biomimetics3,4,6.

1 Bhushan, B., Israelachvili, J. N., and Landman, U., “Nanotribology: Friction, Wear and Lubrication at the Atomic Scale,” Nature 374, 607-616 (1995).  
2 Bhushan, B., Handbook of Micro/Nanotribology, 2nd ed., CRC Press, 1999.
3Bhushan, B., Nanotribology and Nanomechanics: An Introduction, 4th ed., Springer, 2017.
4 Bhushan, B., Springer Handbook of Nanotechnology, 4th ed., Springer, 2017.
5 Bhushan, B. “Nanotribology of Carbon Nanotubes”, J. Phys.: Condens. Matter 20, 365214 (2008).
6Bhushan, B., Biomimetics-Inspired Hierarchical-Structured Surfaces for Green Science and Technology, 3rd ed., Springer, 2018.
7Bhushan, B., “Lessons from Nature for Green Science and Technology: An Overview and Superliquiphoboc/philic Surfaces,” Phil. Trans. R. Soc. A 377, 20180274 (2019).
8Bhushan, B., “Frontiers in Nanotribology: Magnetic Storage, Bio/Nanotechnology, Cosmetics, and Bioinspiration,” J. Colloid Interface Sci. 577, 127-162 (2020)


Bio:
Dr. Bharat Bhushan received an M.S. in mechanical engineering from the Massachusetts Institute of Technology in 1971, an M.S. in mechanics and a Ph.D. in mechanical engineering from the University of Colorado at Boulder in 1973 and 1976, respectively, an MBA from Rensselaer Polytechnic Institute at Troy, NY in 1980, Doctor Technicae from the University of Trondheim at Trondheim, Norway in 1990, a Doctor of Technical Sciences from the Warsaw University of Technology at Warsaw, Poland in 1996, Honorary Doctor of Science from the National Academy of Sciences at Gomel, Belarus in 2000, University of Kragujevac, Serbia in 2011, and Honorary Doctorate from University of Tyumen, Russia. He is a registered professional engineer. He is presently an Ohio Eminent Scholar and The Howard D. Winbigler Professor in the College of Engineering, Director of the Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics (NLB2), and affiliated faculty in John Glenn College of Public Affairs at the Ohio State University, Columbus, Ohio. In 2013-14, he served as ASME/AAAS Science & Technology Policy Fellow, House Committee on Science, Space & Technology, United States Congress, Washington, DC. He has served as Expert Investigator on IP related issues in the U.S. and International Courts. His research interests include fundamental studies with a focus on scanning probe techniques in the interdisciplinary areas of bio/nanotribology, bio/nanomechanics and bio/nanomaterials characterization and applications to bio/nanotechnology, and biomimetics. He is an internationally recognized expert of bio/nanotribology and bio/nanomechanics using scanning probe microscopy, and biomimetics. He is considered by some one of the pioneers of the tribology and mechanics of magnetic storage devices, nanotribology, and biomimetics. He is one of the most prolific authors. He has authored 10 scientific books, 100+ handbook chapters, 900+ scientific papers (One of Google Scholar’s 1494 Highly Cited Researchers in All Fields (h>100), h-index - 130+ with 80k+ citations, i10-index - 780+; Fourth Highly Cited Researcher in Mechanical Eng.; Web of Science h-index - 98+; Scopus h-index - 105+; ISI Highly Cited Researcher in Materials Science since 2007 and in Biology and Biochemistry, 2013; ISI Top 5% Cited Authors for Journals in Chemistry, 2011; Clarivate Analytics Highly Cited Researcher in Cross-field Category, 2018), and 60+ technical reports. His research was listed as the Top Ten Science Stories of 2015. He has also edited 50+ books and holds more than 25 U.S. and foreign patents. He is co-editor of Springer NanoScience and Technology Series and co-editor of Microsystem Technologies. He has given more than 400 invited presentations on six continents and more than 400 keynote/plenary addresses at major international conferences. He delivered a TEDx 2019 lecture on Lessons from Nature.

YOUR ATTENTION PLEASE: MIND THE LAST-MINUTE CHANGE IN VENUE (seminar moved to BM 5 202 due to an unforeseen collision in SV1717).

Zoom link for attending remotely: https://epfl.zoom.us/j/64085517231

 

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