Formation and surface-stabilizing contributions to bare nanoemulsions created with negligible surface charge | Zendy

Andrew P. Carpenter | Zendy; Emma Tran | Zendy; Rebecca M. Altman | Zendy; Geraldine L. Richmond | Zendy

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Formation and surface-stabilizing contributions to bare nanoemulsions created with negligible surface charge

Author(s) -

Andrew P. Carpenter,

Emma Tran,

Rebecca M. Altman,

Geraldine L. Richmond

Publication year - 2019

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.1900802116

Subject(s) - chemical physics , aqueous solution , surface charge , aqueous two phase system , molecule , hydrophobic effect , pulmonary surfactant , coalescence (physics) , chemical engineering , solvent , dispersion (optics) , phase (matter) , materials science , dispersion stability , chemistry , organic chemistry , physics , optics , astrobiology , engineering

Significance There is a growing view that the bare water–hydrophobic interface spontaneously acquires a significant negative charge. Recent bare nanoemulsion studies support this notion, invoking the charge as the primary stabilizing factor. This study reports the creation of bare nanoemulsions that have moderate stability but nearly zero negative surface charge. Surface spectroscopic studies show that there is an enhanced bonding between oil and water at the droplet surface relative to a comparable planar interface that is concluded to be a contributing factor to their stabilization. The results are relevant to soft water–hydrophobic interfaces in the presence and absence of charge that are common in nanosized biological, geological, and environmental systems.

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