DCl Transport through Dodecyl Sulfate Films on Salty Glycerol: Effects of Seawater Ions on Gas Entry

The Journal of Physical Chemistry. a
Michael A ShaloskiGilbert M Nathanson

Abstract

Gas-liquid scattering experiments were employed to measure the entry and dissociation of the acidic gas DCl into salty glycerol coated with dodecyl sulfate ions (DS(-) = CH3(CH2)11OSO3(-)). Five sets of salty solutions were examined: 0.25 and 0.5 M NaCl, 0.25 M MgCl2, 0.25 M CaCl2, and artificial sea salt. DS(-) bulk concentrations were varied from 0 to 11 mM, generating DS(-) surface coverages of up to 34% of a compact monolayer, as determined by surface tension and argon scattering measurements. DS(-) surface segregation is enhanced by the dissolved salts in the order MgCl2 ≈ CaCl2 > sea salt > NaCl. We find that DCl penetration through the dodecyl chains decreases at first gradually and then sharply as more chains segregate to the surface, dropping from 70% entry on bare glycerol to 11% for DS(-) surface concentrations of 1.8 × 10(14) cm(-2). When plotted against DS(-) surface concentration, the DCl entry probabilities fall within a single band for all solutions. These observations imply that the monovalent Na(+) and divalent Ca(2+) and Mg(2+) ions do not bind differently enough to the ROSO3(-) headgroup to significantly alter the diffusive passage of DCl molecules through the dodecyl chains at the same DS(-) chain density. ...Continue Reading

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Citations

Apr 20, 2016·The Journal of Physical Chemistry Letters·Richard E CochranVicki H Grassian
Nov 2, 2016·Environmental Science & Technology·Thilina JayarathneElizabeth A Stone
Apr 7, 2017·Physical Chemistry Chemical Physics : PCCP·Ellen M AdamsHeather C Allen
Apr 17, 2018·Physical Chemistry Chemical Physics : PCCP·Bethany A Wellen RuddHeather C Allen
Aug 22, 2017·Physical Chemistry Chemical Physics : PCCP·Bethany A WellenHeather C Allen
Apr 21, 2017·The Journal of Physical Chemistry. a·Michael A ShaloskiGilbert M Nathanson
Sep 26, 2017·Accounts of Chemical Research·Richard E CochranKimberly A Prather

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