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SDS triggered transformation of highly hydrophobic Pluronics® nanoaggregate into polymer-rich and surfactant-rich mixed micelles
- Source :
- Journal of Molecular Liquids. 345:117812
- Publication Year :
- 2022
- Publisher :
- Elsevier BV, 2022.
-
Abstract
- This work reveals the role of sodium dodecylsulphate (SDS, anionic surfactant) in altering the phase behaviour and aggregation characteristics of five very hydrophobic polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) triblock copolymers containing 10% PEO but with different molecular weight. These copolymers are molecularly dissolved in water at ≤15–20 °C and exist as unstable vesicular structure at temperature close to cloud point (CP) >20 °C. SDS enhanced the aqueous solubility and CP of copolymers in water; progressive addition of SDS triggered the transformation of unstable vesicles into spherical mixed micelles. A correlation between the molecular orbital energy levels of Pluronics® and SDS is well comprehended using computational simulation approach where the perception of SDS stabilized Pluronics® micelles is predicted and correlated with optimized parameters. The size/ shape of copolymer-surfactant mixed nanoscale aggregates was evaluated using dynamic light scattering (DLS) and small-angle neutron scattering (SANS). The scattering studies showed the presence of spherical mixed aggregates, whose size expanded with increase in hydrophobicity of Pluronics®. In high SDS concentration regime, SANS analysis uncovered the diminishing size of vesicles into spherical mixed aggregates. The nanoscale Pluronics®-SDS mixed micelles remained stable in water where this investigation discloses the conceivable ability of orange-OT solubilization using UV–vis spectroscopy.
- Subjects :
- chemistry.chemical_classification
Cloud point
Polymer
Poloxamer
Condensed Matter Physics
Micelle
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Dynamic light scattering
Pulmonary surfactant
chemistry
Chemical engineering
Phase (matter)
Materials Chemistry
Copolymer
Physical and Theoretical Chemistry
Spectroscopy
Subjects
Details
- ISSN :
- 01677322
- Volume :
- 345
- Database :
- OpenAIRE
- Journal :
- Journal of Molecular Liquids
- Accession number :
- edsair.doi...........3cd6e2d14f6b7c593fd8309e94f11d81
- Full Text :
- https://doi.org/10.1016/j.molliq.2021.117812