Speaker: Mark L. Schlossman

Moderator: Prof. LUO Guangming

Time: 10:00AM, Sept.18, 2013

Place: Room B326, IHEP Main Building

Abstract:

Electrostatic interactions control processes at liquid interfaces that underlie many scientific and industrial processes. The speaker will discuss two types of ion transport in which ions are transferred from an aqueous phase to an organic phase. An electrostatic energy penalty accompanies transport into the lower permittivity organic phase and requires shielding of the ion charge. X-ray scattering and other techniques are used to demonstrate the unusual mechanisms for shielding heavily charged nanoparticles and multi-valent ions. In the case of +100 charged nanoparticles, enhanced ion correlations that exist in the organic phase lead to charge reversal simultaneously with the transport. In the case of multi-valent heavy metal ions, X-ray studies reveal the formation of interfacial ion-extractant complexes that are subsequently solvated in the organic phase.

About the speaker:

2004 - present University of Illinois at Chicago, Professor of Physics

2003 - present University of Illinois at Chicago, Courtesy Appointment, Chemical Engineering Department

2000 - 2004 University of Illinois at Chicago, Associate Professor of Physics

1999 - 2008 PRT Spokesperson Beamline X19C, National Synchrotron Light Source (Brookhaven National

Laboratory)

1996 - 2008 Spokesperson for Surface Scattering (Beamline X19C, National Synchrotron Light Source,

Brookhaven National Laboratory)

1995 - present University of Illinois at Chicago, Courtesy Appointment, Chemistry Department

1994 - 2000 University of Illinois at Chicago, Assistant Professor of Physics

1990 - 1994 University of Chicago, Research Scientist in the James Franck Institute