Unusual Growth and Hydration Characteristics of Oil Solubilized Micelles in Aqueous Pluronic Systems
| Autor: | Sukhendu Nath, Vinod K. Aswal, M. Basu, Sugam Kumar, Rajib Ganguly |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Aqueous solution
Viscosity Chemistry Temperature technology industry and agriculture Water Viscometer Poloxamer macromolecular substances medicine.disease Micelle Surfaces Coatings and Films law.invention Chemical engineering law Volume fraction Materials Chemistry Copolymer medicine Dehydration Physical and Theoretical Chemistry Micelles Essential oil |
| Zdroj: | The Journal of Physical Chemistry B. 125:10578-10588 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/acs.jpcb.1c04450 |
| Popis: | Lipophile induced modulations of self-assembly characteristics in aqueous Pluronic systems merit attention because of wide-ranging uses of Pluronics as solubilizing agents of lipophilic substances. In this paper, we report unusual evolutions of structural and hydration properties in lavender essential oil (LO) solubilized Pluronic P85 aqueous micellar systems as a function of micellar volume fraction and temperature. Our DLS, SANS, and viscometry studies show that the spherical-to-wormlike micellar structural transition observed in 1% P85 solutions upon solubilization of LO quite unexpectedly gets suppressed with increased P85 concentration to ≥5%. Detailed SANS studies reveal that the core sizes of the oil solubilized micelles cannot attain the threshold value required for the onset of structural transition at higher copolymer concentrations due to their progressive shrinking with an increase in P85 concentration. Oil solubilized P85 solutions show two cloud points and very interestingly exhibit micellar growth upon cooling to their lower cloud points. Steady state fluorescence studies explain this based on increasing dehydration of micellar corona with a decrease in temperature, very much opposite to what is observed in pure aqueous Pluronic systems. The results give new insight into viscous flow properties and low temperature storage possibilities of oil solubilized aqueous Pluronic systems. |
| Databáze: | OpenAIRE |
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