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Particles at the Interfaces: From Fundamentals to Functional Materials

Abstract:  The phenomenon of adsorption of colloidal particles at interfaces to stabilize the emulsions has been known for more than a century. Today, particle-stabilized emulsions, or so-called Pickering emulsions are receiving growing attention in the scientific and industrial communities. However, our fundamental understanding of the connection between interfacial particle properties and emulsion characteristics is still poor. This presentation will summarize the general principles used in the assembly of colloidal particles at liquid interfaces. In particular, I will discuss the different behavior of the solid and soft particles trapped at the interfaces and address that Pickering emulsions can serve as a template for the fabrication of novel hollow latex particles in a variety of applications.

About the Speaker: To NGAI has received his B.S. in chemistry at the Chinese University of Hong Kong in 1999. In 2003, he obtained his Ph.D. in chemistry in the same university under the supervision of Professor Chi Wu. He moved to BASF (Ludwigshafen, Germany) in 2003 as the postdoctoral fellow in Dr. Helmut Auweter and Dr. Sven-Holger Behrens’s research group. In July 2005, he went to Professor Timothy P Lodge’s group in the Chemistry Department of the University of Minnesota, working on polymer blending. He joined the Chemistry Department at CUHK in 2006 as a research assistant professor and worked on colloidal interactions using his newly established single-particle force measurement technique for two years. He has been appointed as an assistant professor in 2008, and early promoted to associate professor in 2012. In 2017, he was promoted to Professor. His research interests center on various areas of surface and colloid science. He focuses on the design and study the particle behaviour at the fluid interfaces through combination of colloid science, polymer chemistry and soft matter physics. He also focuses on the developing and applying single-particle force microscopy, total internal reflection microscopy (TIRM), and active single-particle microrheometer, to measure the intermolecular and surface forces as well as viscoelastic properties of soft materials.



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