Jeroen A van Bokhoven

Publications (2)9.79 Total impact

• Article: Electronic Structures of Formic Acid (HCOOH) and Formate (HCOO–) in Aqueous Solutions

  Matthew A. Brown, Fernando Vila, Martin Sterrer, Stephan Thürmer, Bernd Winter, Markus Ammann, John J. Rehr, Jeroen A. van Bokhoven
  Journal of Physical Chemistry Letters 01/2012; 3(13):1754-1759. · 6.21 Impact Factor
• Article: Electronic structure of sub-10 nm colloidal silica nanoparticles measured by in situ photoelectron spectroscopy at the aqueous-solid interface.

  Matthew A Brown, Robert Seidel, Stephan Thürmer, Manfred Faubel, John C Hemminger, Jeroen A van Bokhoven, Bernd Winter, Martin Sterrer
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  ABSTRACT: X-Ray photoelectron spectroscopy has been extended to colloidal nanoparticles in aqueous solution using a liquid microjet in combination with synchrotron radiation, which allowed for depth-dependent measurements. Two distinct electronic structures are evident in the Si 2p photoelectron spectrum of 7 nm SiO(2)-nanoparticles at pH 10. A core-shell model is proposed where only the outermost layer of SiO(2) nanoparticles, which is mainly composed of deprotonated silanol groups, >Si-O(-), interacts with the solution. The core of the nanoparticles is not affected by the solvation process and retains the same electronic structure as measured in vacuum. Future opportunities of this new experiment are also highlighted.
  Physical Chemistry Chemical Physics 06/2011; 13(28):12720-3. · 3.57 Impact Factor