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SUMMARY:IMX Seminar Series - Visualizing the Bottom-up and Top-down Format
 ion of Nanomaterials in Liquids with Transmission Electron Microscopy
DTSTART:20220425T131500
DTEND:20220425T141500
DTSTAMP:20260502T045922Z
UID:8aa28b3ad5bd76b1560b746594837380169ec90f1027492a2a13e3f2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Utkur Mirsaidov\, National University of Singapore\nUnde
 rstanding nanoscale details of how materials form from a solution is funda
 mental for materials engineering and the fabrication of many functional de
 vices. Nanomaterials either form via “bottom-up” processes\, such as n
 ucleation and growth\, or “top-down” processes\, such as nanoscale etc
 hing. Despite the technological importance of these processes\, many of th
 eir details remain unknown. This is mainly due to a lack of proper exper
 imental methods that enables the visualization of these solution-based pro
 cesses at the nanoscale in real-time. \nHere\, using time-resolved in s
 itu liquid cell transmission electron microscopy (TEM)\, I will first de
 scribe the details of the nonclassical nucleation of crystals. Specifical
 ly\, I will show nanocrystals nucleate from an aqueous solution via a thre
 e-step mechanism: 1) liquid-liquid phase separation of a solution gold sol
 ution into solute-rich and solute-poor regions\, followed by 2) spontaneou
 s formation of amorphous nanoclusters\, which then 3) matures into crystal
 line nuclei that are large enough to sustain stable growth of nanoparticle
 s.\nNext\, I will extend our approach to describe how templated semiconduc
 tor nanomaterials can be sculpted into desired nanostructures relevant for
  semiconductor microfabrication via wet etching by highlighting previously
  elusive steps involved in this reaction.\nOur studies highlight the impor
 tance of direct visualization of nanoscale processes for the rational 
 design of materials.\n\n\n2) Refernces to 2 papers:\nN. D. Loh\, S. Sen\, 
 M. Bosman\, S. F. Tan\, J. Zhong\, C. Nijhuis\, P. Kral\, P. Matsudaira\, 
 and U. Mirsaidov\, "Multi-step Nucleation of Nanocrystals." Nature Chemis
 try 9\, 77–82 (2017).\n\nX. Liu\, S.-W. Chee\, S. Raj\, M Sawczyk\, P. 
 Kral\, U. Mirsaidov\, “Three-Step Nucleation of Metal-Organic Framework 
 Nanocrystals.” Proceedings of National Academy of Sciences U.S.A. 118(
 10)\, e2008880118 (2021).\n\nBio: Utkur Mirsaidov obtained his Ph.D. in P
 hysics from the University of Texas at Austin\, and after a 3-year postdoc
  at Beckman Institute at the University of Illinois at Urbana-Champaign\, 
 he moved to the National University of Singapore (NUS)\, first\, as a rese
 arch fellow\, and then\, as a faculty member. He is now an associate profe
 ssor in the Department of Physics at NUS. Utkur’s lab uses in situ elect
 ron microscopy to study the nanoscopic details of phase transitions\, nano
 materials synthesis\, micro- and nanofabrication\, and catalysis. \n 
LOCATION:https://epfl.zoom.us/j/68532296336?pwd=UXBrN1RBWHVFQjVjSko2NDF3S3
 Awdz09
STATUS:CONFIRMED
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