Interaction between sodium dodecylsulfate (SDS) and pluronic L61 in aqueous medium: assessment of the nature and morphology of the formed mixed aggregates by NMR, EPR, SANS and FF-TEM measurements
| Autor: | Ajay Mandal, Satya P. Moulik, Masahiko Abe, Animesh Pan, B. V. N. Phani Kumar, J. Subramanian, G. K. S. Prameela, Vinod K. Aswal, Koji Tsuchiya |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Physics and Astronomy 02 engineering and technology Neutron scattering 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Microviscosity Spin probe Pulmonary surfactant Deuterium law Transmission electron microscopy Copolymer Physical chemistry Physical and Theoretical Chemistry 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | Physical chemistry chemical physics : PCCP. 23(23) |
| ISSN: | 1463-9084 |
| Popis: | The interaction of copolymer L61 i.e., (EO)2(PO)32(EO)2 (where EO and PO are ethylene and propylene oxides, respectively) with surfactant SDS (sodium dodecylsulfate) in relation to their self-aggregation, dynamics and microstructures has been physicochemically studied in detail employing the Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR), Small-Angle Neutron Scattering (SANS), and Freeze-Fracture Transmission Electron Microscopy (FF-TEM) methods. The NMR self-diffusion study indicated a synergistic interaction between SDS and L61 forming L61–SDS mixed complex aggregates, and deuterium (2H) NMR pointed out the nonspherical nature of these aggregates with increasing [L61]. EPR spectral analysis of the motional parameters of 5-doxyl steraric acid (5-DSA) as a spin probe provided information on the microviscosity of the local environment of the L61–SDS complex aggregates. SANS probed the geometrical aspects of the SDS–L61 assemblies as a function of both [L61] and [SDS]. Progressive evolution of the mixed-aggregate geometries from globular to prolate ellipsoids with axial ratios ranging from 2 to 10 with increasing [L61] was found. Such morphological changes were further corroborated with the results of 2H NMR and FF-TEM measurements. The strategy of the measurements, and data analysis for a concerted conclusion have been presented. |
| Databáze: | OpenAIRE |
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