【26th June】How hydrophilic can a hydrophilic surface be?
日期：2015-06-26
阅读：547
TITLE: How hydrophilic can a hydrophilic surface be?
SPEAKER: Prof. Dayang Wang, Ian Wark Research Institute, University of South Australia, SA 5095
TIME:June 26(Friday)AM10:00
LOCATION: Fifth-floor Lecture Hall，Chemistry Building A (化学A楼演讲厅)
INVITER: Prof. Jiesheng CHEN(陈接胜教授)
Abstract:
This presentation will focus mainly on our recent study of how the macroscopic wetting behaviour of charged surfaces is correlated with their microscopic chemical nature of the surface ionic groups. In this work polyelectrolyte multilayers (PEMs) were used as model charged surfaces.1 With the aid of sum frequency generation and X-ray photoelectron spectroscopy, we demonstrate the surface wetting behaviour of the PEMs is more closely correlated with the configurational geometry rather than hydrate strength of the uncompensated ionic groups on the surface capping layers. The lessons learnt from the surface wetting and the internal structures of as-prepared PEMs have successfully been translated to an innovative superoleophobic coating strategy, which is simple, versatile, cost-effective, and nanostructure-independent comparing to currently available ones. This has enabled us to easily transform conventional stainless steel meshes to highly effective filters for oil-water separation in high separation efficiency and high water flux, which can be easily scaled up for industrial oil/water separations such as oil spill cleanup in seawater.
Reference:
1. Liu, X.; Leng, C.; Yu, L.; He, K.: Brown, L. J.; Chen, Z.; Cho, J.; Wang, D. “Ion-Specific Oil Repellency of Polyelectrolyte Multilayers in Water: Molecular Insight into Charged Surface Hydrophilicity” Angew. Chem. Int. Ed. 2015, 54, 4851 –4856
Biography:
Dayang Wang is a research professor in Physical Chemistry at the Ian Wark Research Institute (the Wark), University of South Australia (UniSA). He studied Chemistry in Jilin University, China and received his PhD on Polymer Chemistry and Physics in 1998. In 1999-2003, he worked as a postdoctoral fellow (with Prof Frank Caruso) at the Department of Interfaces (headed by Prof Helmuth Möhwald), Max Planck Institute of Colloids and Interfaces (MPIKG) in Potsdam, Germany. In 2004-2010, he was a group leader at the Department of Interfaces, MPIKG. Since July 2010, he took up a professor position in the Wark. His research interests include interface adsorption and transfer, crystallization, self-assembly, hydrogel, and encapsulation and delivery. He has 120 publications in peer-reviewed journals, including 12 papers in Angewandte Chemie, with 4600 citations and h-index of 38. Since joining the Wark, he is a co-inventor on 3 PCT patent applications, one of which has already led to a manufacture license deal ($450K) with Hyflux, Singapore.
