气候变化领域集成服务门户(CCPortal): Molecular characterization of water and surfactant AOT at nanoemulsion surfaces

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DOI	10.1073/pnas.1700099114
	Molecular characterization of water and surfactant AOT at nanoemulsion surfaces
	Hensel J.K.; Carpenter A.P.; Ciszewski R.K.; Schabes B.K.; Kittredge C.T.; Moore F.G.; Richmond G.L.
发表日期	2017
ISSN	0027-8424
起始页码	13351
结束页码	13356
卷号	114 期号:51
英文摘要	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.
英文关键词	Nanoemulsions; Oil-water interfaces; Surface spectroscopy; Surfactants; Vibrational sum-frequency scattering spectroscopy
语种	英语
scopus关键词	counterion; docusate sodium; magnesium ion; nanoparticle; potassium ion; sodium ion; water oil cream; Article; chemical structure; hydrophilicity; hydrophobicity; molecule; nanoemulsion; priority journal; spectroscopy; surface property; vibration
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160562
作者单位	Hensel, J.K., Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401, United States; Carpenter, A.P., Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401, United States; Ciszewski, R.K., Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401, United States; Schabes, B.K., Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401, United States; Kittredge, C.T., Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401, United States; Moore, F.G., Department of Physics, Whitman College, Walla Walla, WA 99362, United States; Richmond, G.L., Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97401, United States
推荐引用方式 GB/T 7714	Hensel J.K.,Carpenter A.P.,Ciszewski R.K.,et al. Molecular characterization of water and surfactant AOT at nanoemulsion surfaces[J],2017,114(51).
APA	Hensel J.K..,Carpenter A.P..,Ciszewski R.K..,Schabes B.K..,Kittredge C.T..,...&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).
MLA	Hensel J.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 114.51(2017).