title: Spontaneous Formation of Multiarchitecture Vesicles of [C8mim]Br + [Na]DBS in Aqueous Medium: Synergic Interplay of Electrostatic, Hydrophobic, and π-π Stacking Interactions.
abstract: A mixture of a cationic surface active ionic liquid, [C8mim]Br and anionic surfactant, [Na]DBS has been shown to form unilamellar vesicles in water over an exceptionally wide mole fraction range of [C8mim]Br (x1 = 0.2 to 0.8). Formation of vesicles has been evidenced from transmission electron microscopy (TEM), cryo-TEM and atomic force microscopy (AFM) imaging. Cryo-TEM imaging of an equimolar mixture showed multiarchitectural unilamellar vesicles (spherical, tubular, and ribbon). Such complex architectures were earlier reported for Janus dendrimers of different structures (Science, 2010, 328, 1014). The synergism between oppositely charged single chain surfactants to form bilayer structures has been explained based on the evidence of π-π stacking interaction from 2D NOESY measurements, Coulombic interactions from zeta potential measurements and magnitude of interaction parameter from the critical aggregation concentration. The aggregation concentrations were measured from tensiometry and fluorescence using pyrene as a polarity probe. The phase behavior at different mixture compositions has been revealed from turbidity measurements and visual inspection. Hydrodynamic radii of self-assembled structures in the bulk solution phase were measured from dynamic light scattering. Vesicles formed have been explored as delivery vehicles for proteins using bovine serum albumin (BSA) as model.
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR)-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, 364002, Gujarat India.
authors.forename: Praveen Singh
authors.initials: PS
authors.lastname: Gehlot
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR)-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, 364002, Gujarat India.
authors.forename: K Srinivasa
authors.initials: KS
authors.lastname: Rao
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR)-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, 364002, Gujarat India.
authors.forename: Pankaj
authors.initials: P
authors.lastname: Bharmoria
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR)-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, 364002, Gujarat India.
authors.forename: Krishnaiah
authors.initials: K
authors.lastname: Damarla
authors.affiliation: CSIR-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, 364002, Gujarat India.
authors.forename: Hariom
authors.initials: H
authors.lastname: Gupta
authors.affiliation: Universität Bayreuth, BIMF - Soft Matter Electron Microscopy, Bayreuth, D-95447, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Drechsler
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR)-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, 364002, Gujarat India.|CSIR-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, 364002, Gujarat India.
authors.forename: Arvind
authors.initials: A
authors.lastname: Kumar