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• W3042947710 endingPage "9089" @default.
• W3042947710 startingPage "9081" @default.
• W3042947710 abstract "Nanoemulsions, nanoscale oil droplets dispersed in an aqueous medium, can be stabilized by polymer–surfactant (PS) mixtures, making them ubiquitous in commercial, industrial, and pharmaceutical applications. It is well-known that the presence of PS layers coadsorbed at the droplet surface plays a significant role in droplet stability and functionality; however, little is understood about the molecular nature of this coadsorption. Such insights are especially important for application in drug delivery where physiological conditions can vary the environmental pH and significantly impact stabilization. Hence, the focus of this study examines the surface properties of ∼300 nm nanoemulsions stabilized by the coadsorption of polyethylenimine (PEI) and charged alkyl surfactants sodium dodecyl sulfate (SDS) and dodecyltrimethylammonium bromide (DTAB). PEI is a common charge-tunable polymer used in nanocarrier templates. This study employs vibrational sum frequency scattering spectroscopy, coupled with ζ-potential and surface pressure measurements performed as a function of varying concentrations and pH. The surface specific spectroscopic results reported herein reveal that PEI adsorption and molecular ordering is influenced by both electrostatic and hydrophobic interactions. While the degree of PEI adsorption is stronger in the presence of anionic SDS than cationic DTAB, for both surfactants, PEI is molecularly disordered in acidic conditions and adopts a persistent net ordering as the solution pH becomes more basic. Both surfactants also display degrees of interfacial conformational ordering that is altered by the presence of the coadsorbed polymer. These results demonstrate the molecular-level diversity in PEI behavior at the droplet interface and provide insight into how such behavior can be controlled to yield nanocarrier technology with specific functions and enhanced efficacy." @default.
• W3042947710 created "2020-07-23" @default.
• W3042947710 creator A5025941194 @default.
• W3042947710 creator A5048017733 @default.
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• W3042947710 date "2020-07-15" @default.
• W3042947710 modified "2023-10-18" @default.
• W3042947710 title "Probing the Molecular Structure of Coadsorbed Polyethylenimine and Charged Surfactants at the Nanoemulsion Droplet Surface" @default.
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• W3042947710 doi "https://doi.org/10.1021/acs.langmuir.0c01095" @default.
• W3042947710 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32668900" @default.
• W3042947710 hasPublicationYear "2020" @default.
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