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In and out salting mechanisms of ions in aqeous solutions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Molecular dynamics simulations by Mario Vazdar of aqueous GuanidiniumChlorine and TetraProylAmmoniumChlorine in mixture with NaCl or Na2SO4 has suggested that Gnd+ forms a bond with SO42- and Gnd+ is pulled to the bulk from thesurface, i.e. Gnd+ is "salted in". To verify the simulations, the surface propensitychanges of aqueous Guanidinium cations and TetraProylAmmonium cations whenadding the dierent salts are studied with photoelectron spectroscopy (XPS). The measurements were made at beamline i411 at MAX-lab, Lund, Sweden. The measurements has shown that Gnd+ is salted out when adding NaCl and salted in byNa2SO4, whereas TPA+ is salted out in both cases. Comparing TPA+ and Gnd+ surface propensities has led to the conclusion that the interaction between Gnd+ and SO42- is the reason for Gnd+ salting in.

Place, publisher, year, edition, pages
2013. , 22 p.
Keyword [en]
Physics, Molecular physics, Molecules, XPS, Photoelectron spectroscopy, Guanidinium, Sodium, Sulfate, Chlorine, Vacuum, X-rays, Liquid, Aqeous, MAXlab, Salt, Salts, In-salting, Out-salting, Surface, Surface science, Microjet
Keyword [sv]
Fysik, Molekylfysik, XPS, Fotoelektronspektroskopi, Guanidnium, Natrium, Sulfat, Klor, Vakuum, Röntgenstålar, Vätskor, Vätska, Vattenlöning, MAXlab, Salt, In-saltning, Ut-saltning, Ytfysik, Yta, Microjet
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:uu:diva-206292OAI: oai:DiVA.org:uu-206292DiVA: diva2:644423
Educational program
Master Programme in Physics
Available from: 2013-09-05 Created: 2013-08-30 Last updated: 2013-09-05Bibliographically approved

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Ekholm, Victor
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Molecular and condensed matter physics
Atom and Molecular Physics and Optics

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