Ions and Surfactants at Aqueous Solution-Vapor Interfaces Investigated with Photoelectron Spectroscopy

Hendrik Bluhm

Fritz Haber Institute
Berlin, Germany

Monday, 23rd January 2023,16:15 s.t.

The talk will be given in hybrid mode.

You can join at:
Josef Loschmidt Hörsaal (HS 2)
University of Vienna, Faculty of Chemistry
Währinger Straße 42, 1090 Vienna

Or you can join the zoom meeting:

Ions and Surfactants at Aqueous Solution-Vapor Interfaces Investigated with Photoelectron Spectroscopy

Aqueous solution-vapor interfaces govern important phenomena in the environment and atmosphere, including the uptake and release of trace gases by aerosols and CO2 sequestration by the oceans. Surfactants are omnipresent on aqueous surfaces exposed to the atmosphere and can potentially alter the propensity of dissolved ions, such as Na+, Mg+, Ca2+, and Cl, for the interface through direct interactions between their functional groups (e.g., -COO, -NH3+) with the ions. The increased propensity of ions for the aqueous solution-air interface in the presence of  surfactants might also increase their availability as reactants in heterogeneous chemical reactions with trace gases in the atmosphere. While field and reactor studies have provided a wealth of information on the general chemical composition of, e.g., the ocean-air interface, detailed molecular-scale information on the mutual effects of ions and surfactants is still relatively scarce. This talk will discuss opportunities and challenges for investigations of liquid-vapor interfaces using X-ray photoelectron spectroscopy and describe recent investigations of the interaction of ions and surfactants at the liquid-vapor interface of artificial seawater solutions.

Bio of Hendrik Bluhm

Hendrik Bluhm received his Ph.D. in physics from the University of Hamburg for scanning force microscopy investigations of ferroelectric crystals in 1996. He then held a postdoctoral research fellowship at the Lawrence Berkeley National Laboratory in the USA, a staff scientist position at the Fritz Haber Institute of the Max-Planck Society in Berlin, Germany, and again staff and senior-scientist positions at the Lawrence Berkeley National Laboratory. Since 2018, he has been a group leader at the Fritz Haber Institute.