Communication: Length scale dependent oil-water energy fluctuations |
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Authors: | Underwood Robin Ben-Amotz Dor |
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Institution: | Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA. |
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Abstract: | Interfacial fluctuations in the cohesive (van der Waals) interaction energy of spherical oil-drops with water provide evidence of a length scale dependent transition from linear to non-linear response behavior. For sub-nanometer oil-drop sizes, energy fluctuations are found to be independent of the van der Waals coupling strength, while nanometer (and larger) size oil drops experience highly non-linear energy fluctuations. The latter behavior is linked to enhanced hydrophobic density fluctuations and the emergence of entropic contributions to oil-water cohesive interaction free energies. |
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