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Beihang University, China
Title: Bioinspired gradient micro and nanostructured surfaces with controlling of dynamic wettability
Biography

Yongmei Zheng, PhD, is a professor at School of Chemistry, Beihang University. Publications are more than 90 SCI papers included in Nature, Adv. Mater., Angew. Chem. Int. Ed., ACS Nano, Chem. Mater., J. Mater. Chem. A, etc., with 12 Cover stories, and a book “bioinspired wettability surfaces: Development in micro- and nanostructures”. Her work was highlight as scientist on News of Royal Society of Chemistry, ChemistryWorld in 2014 with topic of spider silk and bufferfly wings. She is senior member of Chinese Composite Materials Society (CSCM), American Chemistry Society (ACS), Fellow member of NANOSMAT Society, International Society of Bionic Engineering (ISBE), International Association of Advanced Materials (IAAM), and Editorial board member of Scientific Report in nature. She wins an ISBE outstanding contribution award in 2016 by ISBE, in Ningbo of China, and also an IAAM award Medal in 2016 by IAAM, in Sweden, due to the notable and outstanding contribution in field of "Advanced Materials Science and Technology".

Abstract

Biological surfaces create the enigmatical reality to be contributed to learning of human beings. They cooperate between endlessly arranged various-style gradient micro- and nanostructures (MN) that greatly provide with excellent functions via natural evolvement. Such biological surfaces with multi-gradient micro- and nanostructures display unique wetting functions in nature for water collection and water repellency, which have inspired researchers to design originality of materials for promising future. In nature, a combination of multiple gradients in a periodic spindle-knot structure take on surface of spider silk after wet-rebuilding process in mist. This structure drives tiny water droplets directionally toward the spindle-knots for highly efficient water collection. Inspired by the roles of gradient MNs in the water collecting ability of spider silk, a series of functional fibers with unique wettability has been designed by various improved techniques such as dip-coating, fluid-coating, tilt-angle coating, electro-spun and self-assembly, to combine the Rayleigh instability theory. The geometrically-engineered thin fibers display a strong water capturing ability than previously thought. The bead-on-string hetero structured fibers are capable of intelligently responding to environmental changes in humidity. Also a long-range gradient-step spindle-knotted fiber can be driven droplet directionally in a long range. An electro spun fiber at micro-level can be fabricated by the self- assembly wet-rebuilt process, thus the fiber displays strong hanging-droplet ability. The temperature or photo or roughness-responsive fibers can achieve a controlling on droplet driving in directions, which contribute to water collection in efficiency. Besides, inspired by gradient effects on butterfly wing and lotus leaves, the surfaces with ratchet MN, flexible lotus-like MN are fabricated successfully by improved methods, which demonstrate that the gradient MN effect rises up distinctly anti-icing, ice-phobic and de-ice abilities. These multifunctional materials can be designed and fabricated for promising applications such as water-collecting, anti-icing, anti-frosting, or anti-fogging properties for practical applications in aerospace, industry and so on.

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