Abstract
Rheological measurements on aqueous solutions containing a constant concentration of cetyltrimethylammonium bromide and increasing the concentration of counter ion additive, M2X, where X 2− represents 4-methoxysalicylate (4-MeOSa2−) and 3-, 4-methylsalicylate (3-, 4-MeSa2−), exhibit the presence of (i) spherical (SM), wormlike (WM) and branched (BWM) micelles for X 2− = 4-MeOSa2− and (ii) spherical, wormlike, branched micelles, small vesicles (SVs)/planar bilayer sheets (PBLS) and multilamellar vesicles (MLV) for X 2− = 3-, 4-MeSa2−. Zero shear viscosities measured with respect to M2X showed first and second maxima which were used to calculate flow activation energies (E a) at various M2X.
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We thank the Ministry of Higher Education (MOHE) and University of Malaya (UM) for the financial assistance through research grants UM.C/HIR/MOHE/SC/07.
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Razak, N.A., Yusof, N.S.M. & Khan, M.N. Rheological study on counter ion (X 2−)- and temperature-induced cationic micellar growth: a quantitative correlation between X 2− binding affinity to cationic micelles and X 2−- and temperature-induced micellar growth. Rheol Acta 55, 125–136 (2016). https://doi.org/10.1007/s00397-015-0899-y
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DOI: https://doi.org/10.1007/s00397-015-0899-y