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Hensel JK, Carpenter AP, Ciszewski RK, et al. Molecular characterization of water and surfactant AOT at nanoemulsion surfaces. Proc Natl Acad Sci U S A. 2017;114(51):13351-13356doi: 10.1073/pnas.1700099114.
Hensel, J. K., Carpenter, A. P., Ciszewski, R. K., Schabes, B. K., Kittredge, C. T., Moore, F. G., & Richmond, G. L. (2017). Molecular characterization of water and surfactant AOT at nanoemulsion surfaces. Proceedings of the National Academy of Sciences of the United States of America, 114(51), 13351-13356. https://doi.org/10.1073/pnas.1700099114
Hensel, Jennifer K, et al. "Molecular characterization of water and surfactant AOT at nanoemulsion surfaces." Proceedings of the National Academy of Sciences of the United States of America vol. 114,51 (2017): 13351-13356. doi: https://doi.org/10.1073/pnas.1700099114
Hensel JK, Carpenter AP, Ciszewski RK, Schabes BK, Kittredge CT, Moore FG, Richmond GL. Molecular characterization of water and surfactant AOT at nanoemulsion surfaces. Proc Natl Acad Sci U S A. 2017 Dec 19;114(51):13351-13356. doi: 10.1073/pnas.1700099114. Epub 2017 Jul 31. PMID: 28760977; PMCID: PMC5754752.
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Proc Natl Acad Sci U S A. 2017 Dec 19;114(51):13351-13356. doi: 10.1073/pnas.1700099114. Epub 2017 Jul 31.

Molecular characterization of water and surfactant AOT at nanoemulsion surfaces.

Proceedings of the National Academy of Sciences of the United States of America

Jennifer K Hensel, Andrew P Carpenter, Regina K Ciszewski, Brandon K Schabes, Clive T Kittredge, Fred G Moore, Geraldine L Richmond

Affiliations

  1. Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401.
  2. Department of Physics, Whitman College, Walla Walla, WA 99362.
  3. Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401; [email protected].

PMID: 28760977 PMCID: PMC5754752 DOI: 10.1073/pnas.1700099114

Abstract

Nanoemulsions and microemulsions are environments where oil and water can be solubilized in one another to provide a unique platform for many different biological and industrial applications. Nanoemulsions, unlike microemulsions, have seen little work done to characterize molecular interactions at their surfaces. This study provides a detailed investigation of the near-surface molecular structure of regular (oil in water) and reverse (water in oil) nanoemulsions stabilized with the surfactant dioctyl sodium sulfosuccinate (AOT). Vibrational sum-frequency scattering spectroscopy (VSFSS) is used to measure the vibrational spectroscopy of these AOT stabilized regular and reverse nanoemulsions. Complementary studies of AOT adsorbed at the planar oil-water interface are conducted with vibrational sum-frequency spectroscopy (VSFS). Jointly, these give comparative insights into the orientation of interfacial water and the molecular characterization of the hydrophobic and hydrophilic regions of AOT at the different oil-water interfaces. Whereas the polar region of AOT and surrounding interfacial water molecules display nearly identical behavior at both the planar and droplet interface, there is a clear difference in hydrophobic chain ordering even when possible surface concentration differences are taken into account. This chain ordering is found to be invariant as the nanodroplets grow by Ostwald ripening and also with substitution of different counterions (Na:AOT, K:AOT, and Mg:AOT) that consequently also result in different sized nanoparticles. The results paint a compelling picture of surfactant assembly at these relatively large nanoemulsion surfaces and allow for an important comparison of AOT at smaller micellar (curved) and planar oil-water interfaces.

Keywords: nanoemulsions; oil–water interfaces; surface spectroscopy; surfactants; vibrational sum-frequency scattering spectroscopy

Conflict of interest statement

The authors declare no conflict of interest.

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