首页 | 综合通知 | 教务教学 | 学术交流 | 留学信息 | 科研管理 | 文献服务 | 招标信息 | 网络服务 
当前位置: 校园公告>>学术交流>>正文
【学术讲座】南洋理工大学俞璟教授学术讲座通知
2018-11-20 14:40   审核人:   (点击: )

报告题目:Polyelectrolyte brushes in multivalent ionic media: structure and functionality

报告人:俞璟 教授

讲座时间20181122日上午1000

讲座地点:友谊校区老图书馆401

邀请人:李林 教授

承办单位:柔性电子研究院

联系人:王添

联系电话18269103286

报告简介:

Understanding the response of polyelectrolytes to their environment has challenged materials scientists for decades. Polyelectrolyte brushes are of particular interest, as they can regulate transport of ions and molecules, control wettability and adhesion of surfaces, or convert chemical and biochemical stimuli into optical, electrical, and mechanical signals. We combined neutron-reflectivity (NR), atomic force microscopy (AFM), surface forces apparatus (SFA) measurements, and coarse-grained molecular dynamics (MD) simulations to study the structure of planar biomimetic polyelectrolyte brushes (poly(styrenesulfonate), PSS) in a variety of solvent conditions, especially in the presence of multivalent counterions. Multivalent-ion induced lateral structural inhomogeneities of the PSS brushes were first indicated by NR measurements. AFM images provide a direct visualization of lateral inhomogeneities on the surface of polyelectrolyte brushes collapsed in solutions containing trivalent counterions. These images are interpreted in the context of a coarse-grained molecular model, and are corroborated by accompanying interaction-force measurements with the SFA. Our findings indicate that lateral inhomogeneities are absent from PSS brush layers collapsed in a poor solvent without multivalent ions. The inhomogeneous structures of the polyelectrolyte brushes in the presence of multivalent ions can dramatically alter their functionalities in various biomedical applications, such as lubrication, sensors, and DNA-based microarrays.

报告人简介:

Dr. Yu Jing is an assistant professor in the School of Materials Science and Engineering (MSE) at Nanyang Technological University (NTU) in Singapore. He obtained his Bachelor’s degree from Tsinghua University in 2007, and PhD from the University of California, Santa Barbara in 2012, both in Chemical Engineering. His PhD research under the supervision of Prof. Jacob Israelachvili focused on the nanomechanics of biomaterials and biomimetics. He conducted experimental and theoretical studies on both mussel and gecko adhesive systems, and developed bio-inspired polymer surfaces and nano-structured materials. In 2014, he expanded his research interests towards polyelectrolytes brushes during his postdoc with Prof. Matthew Tirrell at the University of Chicago.


关闭窗口
最新公告
关于学习贯彻《新时代高校教师职业行...
关于申报“2019年度西北工业大学在华...
驻校艺术家计划《书画名家工作坊》开...
国家审计走进西北工业大学 财经法治...
关于高雅艺术进校园——国家京剧院赴...
【会议通知】2018年仿真学术交流会
西北工业大学2018迎新文艺晚会预告
校历(2018-2019)
外国语学院“一带一路”跨文化研究所...
关于2019年创新型人才国际合作培养项...
西工大主页  招聘信息  就业信息  本科招生  研招信息
版权所有©西北工业大学  地址:西安市友谊西路127号 邮编:710072