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Small-angle neutron scattering study of aggregate structures of multi-headed pyridinium surfactants in aqueous solution

Haldar, J and Aswal, VK and Goyal, PS and Bhattacharya, S (2004) Small-angle neutron scattering study of aggregate structures of multi-headed pyridinium surfactants in aqueous solution. In: Pramana Journal of Physics, 63 (2). pp. 303-307.

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Abstract

The aggregate structures of a set of novel single-chain surfactants bearing one, two and three pyridinium headgroups have been studied using small-angle neutron scattering (SANS). It is found that the nature of aggregate structures of these cationic surfactants depend on the number of headgroups present in the surfactants. The single-headed pyridinium surfactant forms the lamellar structure, whereas surfactants with double and triple headgroups form micelles in water. The aggregates shrink in size with increase in the number of headgroups in the surfactants.The aggregation number (N) continually decreases and the fractional charge (a) increases with more number of headgroups on the surfactants. The semimajor axis (a) and semiminor axis (b = c) of the micelle also decrease with the increase in the number of headgroups in the surfactants. This indicates that hydrocarbon chains in such micelles prepared from multiheaded surfactants adopt bent conformation and no longer stay in extended conformation.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Indian Academy of Sciences.
Keywords: Multi-headed pyridinium surfactants;Micelle;Small-angle neutron scatter-ing
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Date Deposited: 09 Nov 2004
Last Modified: 19 Sep 2010 04:17
URI: http://eprints.iisc.ernet.in/id/eprint/2295

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