Prameela, G K S and Phani Kumar, B V N and Subramanian, J and Tsuchiya, K and Pan, A and Aswal, V K and Abe, M and Mandal, A B and Moulik, S P (2021) 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. Physical Chemistry Chemical Physics, 23 (23). pp. 13170-13180. ISSN 1463-9076

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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 (H-2) 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 H-2 NMR and FF-TEM measurements. The strategy of the measurements, and data analysis for a concerted conclusion have been presented.

Item Type: Article
Subjects: Microstructure and Characterization
Depositing User: Bidhan Chaudhuri
Date Deposited: 16 Dec 2021 12:21
Last Modified: 16 Dec 2021 12:21

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