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SUMMARY:Nucleation-Inspired Materials Chemistry
DTSTART:20170220T131500
DTEND:20170220T141500
DTSTAMP:20260406T222115Z
UID:d467f3e928536313a496988b072130b3e3616d72d87490b77a38b267
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Denis Gebauer\, University of Konstanz Germany\nContrary t
 o the notion of classical nucleation theory\, the occurrence of stable pre
 -nucleation clusters in aqueous solutions prior nucleation has been demons
 trated for various minerals [1]. While it is classically assumed that mole
 cule-by-molecule\, atom-by-atom\, or ion-by-ion dissolution and growth of 
 un- and metastable nuclei is central to the onset of phase separation\, th
 e pre-nucleation cluster pathway is based upon aggregation of larger nanos
 copic entities. The process initially yields liquid intermediates\, which 
 solidify towards amorphous nanoparticles that eventually transform into cr
 ystals. This "non-classical" crystallization pathway has been studied in t
 he most abundant biominerals\, calcium carbonate and calcium phosphate\, i
 n particular\, but it seems to apply for the aqueous formation of many oth
 er compounds as well [1].\nIn this contribution\, we introduce the basic n
 otions of phase separation\, carving out the difference between classical 
 and so-called non-classical theories. This leads to an overview of the pat
 hway of phase separation via pre-nucleation clusters\, highlighting the la
 test findings in this field. The examples of calcium carbonate [2] and iro
 n(III) oxide [3] show that the non-classical precursors and intermediates 
 can be taken advantage of for the target-oriented generation of materials.
  This includes a better understanding of the multiple roles of additives\,
  ranging from ions to polymers and biomacromolecules.\n \n[1]  D. Gebaue
 r\, M. Kellermeier\, J.D. Gale\, L. Bergström\, H. Cölfen\, Chem. Soc. 
 Rev. 43 (2014) 2348–2371.\n[2]  D. Gebauer\, A. Völkel\, H. Cölfen\, 
 Science 322 (2008) 1819–1822.\n[3]  J. Scheck\, B. Wu\, M. Drechsler\, 
 R. Rosenberg\, A.E.S. Van Driessche\, T.M. Stawski\, D. Gebauer\, J. Chem.
  Phys. Lett. (2016) 3123–3130.\n\nBio: Denis Gebauer obtained his PhD in
  Physical Chemistry from the University of Potsdam (Germany) in 2008\, wor
 king at the Max-Planck- Institute of Colloids and Interfaces. After a 2-ye
 ar postdoctoral stay at Stockholm University (Sweden)\, he became a resear
 ch group leader at the University of Konstanz in 2011. His research intere
 sts include concepts of nucleation and crystallization as well as biominer
 alization and materials chemistry in general. He is one of the awardees of
  the Heinz-Maier-Leibnitz Prizes 2012. Since the beginning of 2013\, Denis
  Gebauer is a Fellow of the Zukunftskolleg of the University of Konstanz.\
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LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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