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SUMMARY:Observing while it happens: in-situ electron microscopy of chemica
 l dynamics
DTSTART:20210527T140000
DTSTAMP:20260508T032348Z
UID:774c73017b576b3064697bcecbec50e62ab64dcadd3faf80b1aa9a11
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Marc Willinger - ScopeM ETHZ\nModern analytical transmissi
 on electron microscopes are capable of delivering picometer resolved infor
 mation about the geometric arrangement of atoms. It is possible to simulta
 neously obtain quantitative information about the elemental composition of
  a material and even to measure the local electronic structure or electric
  and magnetic fields. One of the side-effects of using strongly interactin
 g electrons for the imaging process is the requirement of a good vacuum ne
 ar the sample and throughout the optical system. Obtaining detailed inform
 ation about the state of an isolated material in vacuum is not sufficient 
 if we are interested in processes such as material growth- and decompositi
 on\, corrosion or (electro)catalysis. With the availability of MEMS- (micr
 o electro mechanic systems) technology based TEM holders for in situ exp
 eriments\, it is now possible to study the response of a material to a phy
 sical or chemical stimuli and study gas-phase\, temperature and electroche
 mically induced processes. Since atomic motions can be fast and the tempor
 al resolution of conventional microscopes is limited and furthermore\, pro
 cesses are often related to collective dynamics of many atomic species\, a
  combination of high-resolution imaging with context embedded observation 
 at lower magnification is required. \n\nIn my presentation I will show ho
 w the combination of in situ scanning and transmission electron microsco
 py enables a multi-scale approach for the study of functional materials in
  their relevant state. Examples range from CVD growth of 2D materials [1-4
 ] to corrosion processes and catalysed surface reactions [5]. It will be s
 hown how in situ microscopy reveals the beauty of complex dynamics in sy
 stems that are operated far from thermodynamic equilibrium. The field is s
 till relatively new and with the development of more sensitive and faster 
 detectors as well as further improvement of tools for in situ electron m
 icroscopy\, we are looking towards an exciting expansion of our possibilit
 ies to study complex processes related to atomistic dynamics.\n\n \nRefer
 ences: \n\n	Z.-J. Wang et al.\, ACS Nano\, 2015.\n	Z.-J. Wang et al.\
 , Nature Communications\, 2016. \n	Z.-J. Wang et al.\, Adv. Mater. In
 terfaces\, 2018.\n	M. Huang et al. Nature Nanotechnology\, 2020\n	C. B
 arroo\, Z.-J. Wang\, R. Schlögl\, M.-G. Willinger\, Nature Catalysis\, 
 2019.\n
LOCATION:Zoom https://epfl.zoom.us/j/6531516922
STATUS:CONFIRMED
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