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Modeling and Computer Simulation of Underpotential Deposition at the Nanoscale by Ezequiel Leiva

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Date: 
October 25, 2013 - 10:00am - 11:30am
Location: 
Engineering Bldg. 1, Cullen College of Engineering, University of Houston TX

***** Seminar *****
Center for Integrated Bio and Nano Systems
Houston Chapter of IEEE Nanotechnology Council and Houston Chapter of IEEE Magnetics Society
                                                                               
Friday, Oct. 25, 2013
10:00 A.M.
Room: N355  Engineering Bldg. 1

MODELING AND COMPUTER SIMULATION OF UNDERPOTENTIAL DEPOSITION AT THE NANOSCALE

Ezequiel Leiva
Department of Mathematics and Physics College of Chemical Sciences,
Universidad Nacional de Cordoba, Argentina

The electrochemical formation of non-bulk surface (sub)monolayers at potentials more positive than the reversible Nernst potential for the bulk deposition of the adsorbate, popularly denominated underpotential deposition (upd), has been observed with a great variety of substrate/adsorbate combinations, including nanoparticles(NPs). The latter have awaked great interest in both the scientific and technological communities, and the size-dependence of their thermodynamic properties has been a hot topic of research in recent years. In the present talk we will address three different aspects of upd:

  1. We will consider upd on surfaces with different curvatures, and we will show that in the case of surfaces with positive curvatures(NPs) the upd phenomenon should vanish in the nanoscale.
  2. We will show how to deal with upd modeling in the presence of anions, and show that in some systems the presence of anions may be essential for the existence of upd.
  3. We will analyze how to calculate the entropic contribution to the stability of upd deposits.

Bio of Dr. Leiva:
Prof. Dr. Ezequiel P.M. Leiva obtained his BS and PhD from Cordoba University, Argentina, in 1979 and 1982. In 1984 he moved to the Institut fur Physikalische Chemie of University of Bonn as a postdoctoral fellow. He returned to Argentina 1986, where he was appointed to a Lectureship in Physical Chemistry. In 1993 he returned to Germany as a fellow of the Humboldt Foundation. In 1995 he returned to Argentina and served as associate professor and later as full professor (1999). Between 1996 and 2009 he was the head of the Unit of Mathematics and Physics of the College of Chemical Sciences, Universidad de Cordoba. He is the recipient of the Stock Exchange of Cordoba and the Bank of Boston Foundations in Córdoba, and Rafael Labriola Prize of the Asociación Química Argentina. He has published over 130 papers in refereed journals and 18 book chapters.

If you are interested in meeting and talking to Dr. Leiva, please contact Dr. Brankovic at SRBrankovic [at] uh [dot] edu (SRBrankovic [at] uh [dot] edu.)