直播时间：2023年4月21日（周五）20:00-21:30

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北京时间2023年4月21日晚八点，iCANX Talks 第140期将在iCANX平台上线！本期我们邀请到安特卫普大学 Sara Bals教授进行分享纳米材料的三维特性！更多精彩，敬请期待！

【直播介绍】

Sara Bals

University of Antwerp

3D Characterization of Nanomaterials under Relevant Conditions by Electron Tomography

【Abstract】

Electron tomography enables one to measure the morphology and composition of nanostructures in three dimensions (3D), even at atomic resolution. However, an emerging challenge is to fully understand the connection between the 3D structure and properties under realistic conditions, including high temperatures as well as in the presence of liquids and gases.

电子断层扫描使人们能够在三维（3D）中测量纳米结构的形态和组成，甚至能达到原子级的分辨率。然而，在现实中面临新的挑战，譬如，如何在高温以及存在液体和气体的情况下，充分理解3D结构和性能之间的关系。

Our recent experiments demonstrate the progress that can be obtained by accelerating both the acquisition and reconstruction during electron tomography. In this manner, we were able to perform a dynamic characterisation of shape changes of metal nanoparticles at high temperatures. Moreover, we measured the elemental diffusion dynamics of individual anisotropic bimetallic nanoparticles in 3D and determined the effect of parameters such as type of interfacial facets, aspect ratio, shape and presence of defects.

我们最近的实验证明了在电子断层扫描过程中通过加快采集和重建速度的方式可以突破这一挑战。通过这种方式，我们能够对金属纳米颗粒在高温下的形状变化进行动态表征。此外，在三维空间中测量了单个各向异性双金属纳米颗粒的元素扩散动力学，并确定了界面刻面类型、纵横比、形状和缺陷存在等参数的影响。

Finally, by combining aberration corrected electron microscopy with a quantitative interpretation, we can provide quantitative measurements of the coordination numbers of the surface atoms of catalytic nanoparticles at high temperatures and in gaseous environments.

最后，通过将像差校正电子显微镜与定量解释相结合，我们可以对高温和气体环境下催化纳米颗粒的表面原子配位数进行定量测量。

【BIOGRAPHY】

Sara Bals studied Physics at the University of Antwerp from 1995-1999. She obtained her PhD in 2003 with greatest distinction and special honours by the jury. From 2003-2004, she did postdoctoral work at the National Center of Electron Microscopy in Berkeley, USA. After returning to UAntwerp, she became an Assistant Professor in the Physics Department. In 2018 she was promoted to Full Professor. She is currently the spokesperson of EMAT, consisting of 7 principal investigators, about 25 postdoctoral researchers and more than 30 PhD students. Moreover, she is the coordinator of the “Nanolab” Centre of Excellence at the host institution, composed of 6 research groups.

Sara Bals，1995年至1999年在安特卫普大学学习物理。2003年获得博士学位，获得了评审团授予的最高荣誉和特别荣誉。2003-2004年在美国伯克利的国家电子显微镜中心做博士后工作。回到安特卫普后，在安特卫普大学任物理系助理教授。2018年，任物理系正教授。目前担任比利时安特卫普大学EMAT实验室发言人。此外，她还担任安特卫普大学“NANOlab Centre of Excellence”的协调员，该中心由6个研究小组组成。

She was awarded an ERC Starting grant in 2012, an ERC Consolidator grant in 2018, received the award "Laureate of the Academy for Natural Sciences" by the Royal Flemish Academy in 2016, became Francqui research professor in 2017 and was elected as member of the Royal Flemish Academy of Belgium for Science and the Arts in 2020. She received the European Microscopy Award in 2020 and the ACS Nano Lectureship award in 2021.

2012年，她获得ERC Starting Grant资助，2018年获得欧洲研究理事会巩固基金（ERC Consolidator grant），2016年获得了皇家佛兰德学院颁发的“自然科学院奖”（"Laureate of the Academy for Natural Sciences"），2017年成为弗兰基研究教授，2020年当选为比利时皇家佛兰德科学与艺术学院教授。她于2020年获得European Microscopy奖，2021获得ACS Nano Lectureship奖。