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

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 N...

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Veröffentlicht in:Physical chemistry chemical physics : PCCP 2021-06, Vol.23 (23), p.1317-1318
Hauptverfasser: Prameela, G. K. S, Phani Kumar, B. V. N, Subramanian, J, Tsuchiya, K, Pan, A, Aswal, V. K, Abe, M, Mandal, A. B, Moulik, S. P
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Sprache:eng
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Zusammenfassung: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 ( 2 H) 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 2 H NMR and FF-TEM measurements. The strategy of the measurements, and data analysis for a concerted conclusion have been presented. The gist of the morphological changes of the self-assemblies in solution by way of the SDS-L61 interaction primarily based on findings from SANS and FFTEM measurements supplemented with other methods.
ISSN:1463-9076
1463-9084
DOI:10.1039/d0cp06227h