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名    称: 同济-科思创杰出学者讲座
姓    名: 江颖
联系电话: 18086455662
会议主题: 视频会议
预约日期: 2022-06-17
开始时间: 10:00
结束时间: 11:30
地    点: 网络 主讲人照片
主讲人简介: 江颖,北京大学物理学院量子材料科学中心博雅特聘教授,国家杰出青年科学基金获得者,国家“万人计划”领军人才,美国物理学会会士。研究领域为表面物理化学和扫描探针显微学。多次在国际顶级期刊发表文章,包括:Science 3篇、Nature 5篇、Nature子刊10余篇、Nature Reviews系列等综述文章6篇。受邀在美国物理学会年会、美国化学学会年会、美国真空学会年会等重要国际学术会议上作邀请报告近百场(包括13次大会/主旨报告)。曾获中国科学十大进展(2016和2018)、陈嘉庚青年科学奖数理科学奖(2018)、中国青年科技奖(2019)、北京市杰出青年中关村奖(2020)、日本“仁科芳雄亚洲奖”(Nishina Asia Award 2020)、全球华人物理与天文学会“亚洲成就奖”(AAA,Robert T. Poe Prize 2020)等国内外荣誉或奖项。
报告内容简介: Ion hydration and transport at interfaces are relevant to a wide range of applied fields and natural processes. Interfacial effects are particularly profound in confined geometries such as nanometre-sized channels, where the mechanisms of ion transport in bulk solutions may not apply. To correlate atomic structure with the transport properties of hydrated ions, both the interfacial inhomogeneity and the complex competing interactions among ions, water and surfaces require detailed molecular-level characterization. Using a noncontact atomic force microscopy (AFM) system, we were able to image the individual ion hydrates at surfaces with atomic resolution. We found that the alkali ion with specific hydration numbers diffuses orders of magnitude more quickly than other ion hydrates, arising from the degree of symmetry match between the hydrates and the surface lattice. In addition, we found that the alkali ions can come into close contact with each other through the dehydration and water rearrangement process, which is driven by the effective ionic attraction due to the interplay between the water-ion and water-water interactions. These results not only help us to understand the nature of biological ion channels, but may also provide general design principles for artificial ion channels towards high permeation rate and selectivity.

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