Abstract
Isomeric additives, maleic and fumaric acids (MA and FA) showed a distinctive influence on the structural transition induced by n-octanol in aqueous cetyltrimethylammonium bromide (CTAB) solution. With MA, significant increase in viscosity was observed on successive addition of n-octanol. Samples with high n-octanol concentration showed viscoelasticity. However, no such dramatic change was observed with FA. Rheological studies revealed the existence of entangled threadlike micelles in CTAB/MA/n-octanol system. Newtonian flow behaviour exhibited by the FA-containing samples indicated the presence of spherical micelles. The existence of threadlike micelles in MA containing samples was further confirmed by cryogenic transmission electron microscopy and small-angle neutron scattering studies. The favourable geometry and better acidic strength of MA are regarded as the factors synergistically facilitating unidimensional micellar growth in the presence of n-octanol. In contrast, the stronger hydrophobicity of FA resulting from trans geometry and feeble ionization, modifies the solvent properties and retards micellar growth.
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Acknowledgments
This work was performed under the collaborative research scheme (CRS-K-0/5/20) of the UGC-DAE Consortium for Scientific Research, Kalpakkam node, India. The support and encouragement of Dr. G. Amarendra (scientist-in-charge, Kalpakkam node) is gratefully acknowledged. Authors are thankful to Dr. Ellina Kesselman and Dr. Judith Schmidt (Technion-Israel Institute of Technology) for their immense help in the cryo-TEM analysis. Thanks are due to Dr. K. Saravanakumar (IGCAR, Kalpkkam) for his help in carrying out the rheological experiments and Dr. C. Lakshmi and her research group (NIT, Calicut) for providing the fluorescence spectroscopy facility. Authors are thankful to Dr. Sanjeev Kumar (The Maharaja Sayajirao University of Baroda) for useful discussions.
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Linet Rose, J., Tata, B.V.R., Talmon, Y. et al. Distinctive effect of maleic acid and fumaric acid on structural transitions in cationic micellar solution. Colloid Polym Sci 293, 1383–1390 (2015). https://doi.org/10.1007/s00396-015-3521-z
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DOI: https://doi.org/10.1007/s00396-015-3521-z