Lessons From Nature: Bioinspired Mechanically Durable and Self-Healing Superliquiphilic/Phobic Surfaces


Event details

Date 24.06.2022 14:3015:30  
Speaker Prof. Bharat Bhushan, Academy Professor, The Ohio State University, Columbus, OH (USA)
Location Online
Category Conferences - Seminars
Event Language English

(Talk 2/3 in a mini-series: talk 1 taking place on June 23, talk 3 on June 28, 2022)

Living nature, through some 3 billion years of evolution, has developed materials, objects, and processes that function from the nanoscale to the macroscale. The understanding of the functions provided by species and processes found in living nature can guide us to design and produce bioinspired surfaces for various applications1,2. There are a large number of flora and fauna with properties of commercial interest. Nature provides many examples of surfaces that repel (hydrophobic) or attract (hydrophilic) water. The most famous is the lotus leaf. Its surface contains a hierarchical structure that, combined with specific surface chemistry, results in a water repellant surface that is self-cleaning, as water droplets collect contaminants as they roll off. Some plant leaves, such as fagus leaves, are hydrophilic, allowing water to rapidly spread into a thin layer, increasing evaporation, leading to a dry and self-cleaning surface. By taking inspiration from nature, it is possible to create hierarchically structured surfaces with re-entrant geometry and surface chemistry that provide multifunctional properties including superliquiphilicity/phobicity, self-cleaning/low biofouling, and/or low drag.
A facile, substrate-independent, multilayered nanoparticle/binder composite coating technique has been developed to produce various combinations of water and oil repellency and affinity with self-cleaning properties3. These coatings having a so-called re-entrant geometry can also repel surfactant-containing liquids. Some of the nanostructured surfaces have been found to be anti-bacterial4.  These coatings provide the basis to fabricate surfaces for a range of applications including self-cleaning, anti-fouling, anti-smudge, optical transparency, anti-fogging, anti-icing, low drag, water purification, and oil–water separation1,3-7. The coatings have been found to be mechanically durable and self-healing3,5.

[1]Bhushan, B., Biomimetics: Bioinspired Hierarchical-Structured Surfaces for Green Science and Technology, third ed., Springer (2018).
2Nosonovsky, M. and Bhushan, B., Multiscale Dissipative Mechanisms and Hierarchical Surfaces: Friction, Superhydrophobicity, and Biomimetics, Springer (2008).
3Bhushan, B., “Lessons from Nature for Green Science and Technology: An Overview and Superliquiphoboc/philic Surfaces,” Phil. Trans. R. Soc. A 377, 20180274 (2019).
4Bixler, G. D., Theiss, A., Bhushan, B., and Lee, S. C., “Anti-fouling Properties of Microstructured Surfaces Bio-inspired by Rice Leaves and Butterfly Wings,” J. Colloid Interface Sci. 419, 114-133 (2014).
5Multanen, V. and Bhushan, B, “Bioinspired Self-healing, Superliquiphobic and Self-cleaning Hydrogel- coated Surfaces with High Durability, Phil. Trans. R. Soc. A 377, 20190117 (2019).
6Nosonovsky, M. and Bhushan, B., Green Tribology: Biomimetics, Energy Conservation and Sustainability, Springer (2012).
7TED Talk - Lessons from Nature: Bioinspired Surfaces for Green Tech, 2019, https://www.youtube.com/watch?v=QAH0N328okE

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.

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

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