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SUMMARY:Nanocrystals as chemical building blocks
DTSTART:20190415T131500
DTEND:20190415T141500
DTSTAMP:20261001T181250Z
UID:bcd000c781106b068a39c160c521e9d46e5ca31c76f23dec69c0dabb
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Helmut Cölfen\, University of Konstanz\, Physical Chemi
 stry\nNanoparticles have interesting analogies to molecules. Recent resear
 ch has revealed that nanocrystals can align and fuse to larger single crys
 talline units (Oriented Attachment) or build self-assembled superstructure
 s with mutual crystallographic order (Mesocrystals). These examples sugges
 t that it should be possible to establish chemistry with nanocrystals as c
 hemical building blocks. Nanocrystals are similar to molecules concerning 
 active reaction sites and ability for directed interactions. Oriented atta
 chment is analogous to chemical bond formation\, while mesocrystal formati
 on is analogous to non-covalent bonds in complexes between molecules. Key 
 for the defined nanocrystal activation as chemical building unit is the se
 lective adsorption/desorption of specially designed molecules on pre-defin
 ed crystal faces. Examples for this concept will be given for gold nanopar
 ticles.\nAlternatively\, interaction of the nanocrystal surface adsorbed m
 olecules can be induced\, leading to mesocrystal formation. Examples will 
 be given for magnetite mesocrystals and their analogies to classical cryst
 als will be discussed. Also\, first results on the formation of binary mes
 ocrystals will be given\, combining the properties of chemically different
  nanocrystals.\n\nBio: HELMUT CÖLFEN is full professor for physical chemi
 stry at the university of Konstanz. His research interests are in the area
  of nucleation\, classical and non-classical crystallization\, Biominerali
 zation\, synthesis of functional polymers\, directed self assembly of nano
 particles and fractionating methods of polymer and nanoparticle analysis. 
 He has published more than 350 papers and was listed among the top 100 che
 mists 2000 – 2010 by Thomson Reuters.\n\n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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