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Bioinspired Materials for Multiphase Heat Transfer

Friday, October 6, 2017, 2:00 PM
Nedderman Hall (NH) 105

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Dr. Xianming (Simon) Dai
Assistant Professor
Mechanical Engineering
800 W Campbell Rd.
University of Texas at Dallas
Richardson, TX 75080

Droplet nucleation and repellency on surfaces are two fundamental issues that are critical to condensation heat transfer. State-of-the-art liquid-repellent surfaces cannot achieve exceptional droplet nucleation and repellency concurrently due to the unfavorable hydrophobic surface chemistry and droplet pinning on surface defects. While hydrophilic surface chemistry favors droplet nucleation, hydrophilic surfaces with excellent droplet nucleation and removal capabilities have not been reported. Inspired by the unique functions of pitcher plants, and lotus and rice leaves, we present a hydrophilic directional slippery rough surface (SRS) that is capable of rapidly nucleating on the hydrophilic functional groups and removing water droplets on the super slippery water-lubricant interface. This creates an alternative condensation strategy beyond jumping droplet condensation. Our surfaces consist of nanostructured microchannels with infused hydrophilic liquid lubricant into the nanotextures alone. We have demonstrated that the SRS, owing to its large surface area, hydrophilic slippery interface and directional droplet mobility, significantly outperforms state-of-the-art hydrophobic liquid-repellent surfaces including superhydrophobic surfaces and slippery liquid-infused porous surfaces in condensation heat transfer.

Dr. Xianming (Simon) Dai is an assistant professor of Mechanical Engineering at the University of Texas at Dallas (UTD). Prior to that, he was a postdoctoral researcher at the Pennsylvania State University. He earned his Ph.D. degree at the University of South Carolina, and his M.S. and B.S. degrees at Huazhong University of Science and Technology and Chongqing University in China. Dr. Dai's research interests include bioinspired materials, superhydrophobic surfaces, heat transfer and biosensing. He participated in many research projects funded by DARPA, ARPA-E, ONR, NASA and NSF. His work was selected as JALA Top Ten Breakthroughs in 2016. His publications were featured in many prestigious media, such as NSF Science360, US News and CCTV.

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