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      On the stability and necessary electrophoretic mobility of bare oil nanodroplets in water

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      Author(s)
      Pullanchery, S.
      Kulik, S.
      Okur, Halil I.
      de Aguiar, H. B.
      Roke, S.
      Date
      2020
      Source Title
      Journal of Chemical Physics
      Print ISSN
      0021-9606
      Publisher
      American Institute of Physics
      Volume
      152
      Issue
      24
      Pages
      241104-1 - 241104-6
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Hydrophobic oil droplets, particles, and air bubbles can be dispersed in water as kinetically stabilized dispersions. It has been established since the 19th century that such objects harbor a negative electrostatic potential roughly twice larger than the thermal energy. The source of this charge continues to be one of the core observations in relation to hydrophobicity, and its molecular explanation is still debated. What is clear though is that the stabilizing interaction in these systems is understood in terms of electrostatic repulsion via Derjaguin, Landau, Verwey, and Overbeek theory. Recent work [A. P. Carpenter et al., Proc. Natl. Acad. Sci. U. S. A. 116, 9214 (2019)] has added another element into the discussion, reporting the creation of bare near-zero charged droplets of oil in neat water that are stable for several days. Key to the creation of the droplets is a rigorous glassware cleaning procedure. Here, we investigate these conclusions and show that the cleaning procedure of glassware has no influence on the electrophoretic mobility of the droplets and that oil droplets with near-zero charge are unstable. We provide an alternative possible explanation for the observations involving glass surface chemistry.
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      http://hdl.handle.net/11693/55065
      Published Version (Please cite this version)
      https://dx.doi.org/10.1063/5.0009640
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      • Institute of Materials Science and Nanotechnology (UNAM) 2098
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