题目：A 3D Superhydrophobic Material for Multifaceted Applications

报告人：张国平教授，University of Massachusetts Amherst

时间：2019年6月21日，上午10：00-11：30

地点：西六楼五楼报告厅

Abstract: Recently a 3D superhydrophobic hybrid organic-inorganic polymeric (SHOIP) material was synthesized through a simple sol-gel process. It can be easily pulverized into an artificial soil or powdery material with particle sizes of less than 2-20 mm, which possesses many unique properties enabling many viable, multifaceted applications, such as water-oil separation, water barriers, anti-icing, anti-biofouling, anti-freezing, flow drag reduction, and self-cleaning. Moreover, such a hybrid material combines the advantages of both inorganic and organic components, and thus is highly resistant to acidic (pH > 1), alkaline (pH < 11.5), and saline water (even at saturated salt concentration) as well as heat with the maximum temperature to 370 ^oC. Initial work focuses on the impermeable behavior of such a material. Laboratory testing was conducted to characterize this SHOIP material as well as its permeability and barrier behavior, particularly the influences of both hydraulic head and time on the stability and durability of the SHOIP soil used as an impermeable barrier. Results indicate that the SHOIP soil can be impermeable below a critical hydraulic head (or breakthrough pressure) and maintain its stability with highly saline, acidic, and alkaline permeants provided that the head difference is less than the breakthrough pressure. Microstructural characterization on the hierarchical multiscale surface texture revealed the origins of stability and durability of SHOIP when used as an impermeable barrier. It can also be used as an additive in concrete and other cementitious materials as well as paints and coatings for many functional enhancements such as anti-corrosion, self-cleaning, among others.

Bio Sketch: Guoping Zhang is currently a professor in the Department of Civil & Environmental Engineering at the University of Massachusetts Amherst. He obtained a PhD in Geotechnical Engineering with a minor degree in Materials Science and Engineering from MIT in 2002. His research is centered on clay-based and clay-derived materials, including clay minerals, clay-biopolymer aggregates and flocs, shales, geopolymers, and superhydrophobic materials, as well as their property (mainly mechanical) characterization and applications, with funding from a variety of federal, state, and industrial sponsors.

http://scholar.google.com/citations?user=wS44C2QAAAAJ&hl=en