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Stern layer formation induced by hydrophobic interactions: a molecular level study.
Journal article

Stern layer formation induced by hydrophobic interactions: a molecular level study.

  • Scheu R Laboratory for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI), School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne, Switzerland.
  • Chen Y
  • Subinya M
  • Roke S
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  • 2013-12-11
Published in:
  • Journal of the American Chemical Society. - 2013
Hydrophobic and Hydrophilic Interactions
Ions
Models, Molecular
Nanoparticles
Oils
Quaternary Ammonium Compounds
Surface Properties
Water
English The molecular ionic surface structure and charge of the electric double layer around a nanodroplet and its structural change induced by hydrophobic effects are measured using vibrational coherent surface scattering spectroscopy, second harmonic scattering, and electrokinetic mobility measurements. Tetraalkylammonium chloride salts were added to negatively charged nanoscopic oil droplets in water. When we vary the alkyl chain length of the cation from CH3 to C4H10, both the size of the cation and its hydrophobic interaction are increased. We find that tetramethylammonium ions change the electrokinetic potential and the water structure but do not detectably adsorb to the interface. Tetrapropylammonium and tetrabutylammonium ions clearly adsorb to the interface. The corresponding (Stern) layer appears to be a mixed monolayer of anions and cations. An estimate of the amount of cations in the Stern layer is also made.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://folia.unifr.ch/global/documents/80432
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