报告一：

报告题目：Adsorption of Microgel Particles at the Oil-Water Interfaces

报 告 人：Prof. To Ngai  (The Chinese University of Hong Kong)

报告时间：2015年10月15日下午3：30

报告地点：化学楼二楼一号会议室   

报告简介：

Microgels are colloidal particles that consist of chemically cross-linked three-dimensional polymer networks. They are able to dramatically swell or shrink in response to a variety of external stimuli such as temperature, pH, ionic strength, electric field, and enzyme activities. Very recently, microgel particles were employed as stabilizers for preparing responsive emulsions. It has been shown that soft particles are better emulsifiers than hard particles because they are soft, porous and can be stretched at the fluid interfaces. In this talk, I will summarize the general principles used in the assembly of colloidal particles at liquid interfaces. Also, I will review recent studies where microgel particles were employed as emulsion stabilizers, focusing on connection between the emulsion stability to the behavior and conformation of microgel particles at the oil-water interface.

报告二：

报告题目：Advanced Surface Characterization of Particles

报 告 人：Dr. Robert Weisbein Hart (CEO)

Optofluidics Inc., Philadelphia, PA, USA

报告时间：2015年10月15日下午4：30

报告地点：化学楼二楼一号会议室 

报告简介：

A new technique to characterize particles down to 50 nanometers was developed by Optofluidics and is based on technology from Cornell University.  Whether a particle sticks to a neighbor, sticks to a wall, adsorbs proteins or crashes out of solution are all related to surface properties.  NanoTweezer Surface uses a laser to push particles against a reference surface and measure the interaction strength between the two.  It can measure individual particles and build the statistics from the ground up.  It is far superior to zeta potential and we believe it will become the standard way to test nanoparticle formulations and lot-to-lot variations as well as a forensic tool for finding out what went wrong in a preparation.