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Issue 34, 2012
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Fibrous gels of cetylpyridinium chloride in binary solvent mixtures: structural characteristics and phase behaviour

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Abstract

Molecular gels of cetylpyridinium chloride (CPC) in binary solvent mixtures have been investigated. CPC formed a turbid gel at a critical solvent composition of 3 : 1 v/v CHCl3 : H2O. The gelation ability was evaluated in various other organic solvents in the presence of water and the phase evolution was studied. The microstructure of the CPC gel was proposed based on spectroscopic, microscopic and small-angle X-ray scattering (SAXS) techniques. A detailed molecular level investigation using SAXS and molecular modelling demonstrated the gel to assemble as a lamellar organization maintaining a highly interdigitated bilayer structure with CPC molecules. Concentration dependent hierarchical self-assembly from micelles to fibrous gels was thus elucidated with highly interdigitated lamellar gel organization resulting from intense hydrophobic interactions in the tail-to-tail arranged bilayers. The stimuli responsiveness of the gel was elucidated with pH dependent entrapment of Congo Red.

Graphical abstract: Fibrous gels of cetylpyridinium chloride in binary solvent mixtures: structural characteristics and phase behaviour

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Article information


Submitted
05 Apr 2012
Accepted
11 Jul 2012
First published
30 Jul 2012

J. Mater. Chem., 2012,22, 17842-17847
Article type
Paper

Fibrous gels of cetylpyridinium chloride in binary solvent mixtures: structural characteristics and phase behaviour

I. Ramakanth, N. Ramesh and A. Patnaik, J. Mater. Chem., 2012, 22, 17842
DOI: 10.1039/C2JM32123H

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