Abstract
A highly viscoelastic worm-like micellar solution is formed in hexadecyltrimethylammonium bromide (CTAB) in the presence of sodium nitrate (NaNO3). A gradual increase in micellar length with increasing NaNO3 was assumed from the rheological measurements where the zero-shear viscosity (η 0) versus NaNO3 concentration curve exhibits a maximum. However, upon increase in temperature, the viscosity decreases. Changes in the structural parameters of the micelles with addition of NaNO3 were inferred from small angle neutron scattering measurements (SANS). The intensity of scattered neutrons in the low q region was found to increase with increasing NaNO3 concentration. This suggests an increase in the size of the micelles and/or decrease of intermicellar interaction with increasing salt concentration. Analysis of the SANS data using prolate ellipsoidal structure and Yukawa form of interaction potential between micelles indicate that addition of NaNO3 leads to a decrease in the surface charge of the ellipsoidal micelles which induces micellar growth. Cryo-TEM measurements support the presence of thread-like micelles in CTAB and NaNO3.
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References
M E Cates and S J Candau, J. Phys.: Condens. Matter 2, 6869 ((1990)
H Hoffmann, in Structures and flow in surfactant solutions edited by C A Herb and R K Prud’homme (American Chemical Society, Washington, DC, 1994) p. 2031
H Rehage and H J Hoffmann, Phys. Chem. 92, 4712 (1988)
F Kern, P Lemarechal, S J Candau and M E Cates, Langmuir 8, 437 (1992)
P A Hassan, S J Candau, F Kern and C Manohar, Langmuir 14, 6025 (1998)
T Shikata, M Shiokawa and S Imai, J. Colloid Interface Sci. 259, 367 (2003)
S R Raghavan, G Fritz and E W Kaler, Langmuir 18, 3797 (2002)
W-J Kim and S-M Yang, J. Colloid Interface Sci. 232, 225 (2000)
R D Koehler, S R Raghavan and E W Kaler, J. Phys. Chem. B104, 11035 (2000)
E W Kaler, K L Herrington, A K Murthy and J A N Zasadzinski, J. Phys. Chem. 96, 6698 (1992)
H Maeda, A Yamamoto, M Souda, H Kawasaki, K S Hossain, N Nemoto and M Almgren, J. Phys. Chem. B105, 5411 (2001)
D Varade, K Ushiyama, L K Shrestha and K Aramaki, J. Colloid Interface Sci. 312, 489 (2007)
D Danino, A Bernheim-Groswasser and Y Talmon, Colloids and Surfaces A183, 113 (2001)
V K Aswal and P S Goyal, Curr. Sci. 79, 947 (2000)
P S Goyal and V K Aswal, Curr. Sci. 80, 972 (2001)
M E Cates and S J Candau, J. Phys.: Condens. Matter 2, 6869 (1990)
S R Raghavan and E W Kaler, Langmuir 17, 300 (2001)
D Varade, C Rodríguez-Abreu, L K Shrestha and K Aramaki, J. Phys. Chem. B111, 10438 (2007)
S H Chen, E Y Sheu, H Kalus and H Hoffmann, J. Appl. Crystallogr. 21, 751 (1988)
S S Berr, J. Phys. Chem. 91, 4760 (1987)
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Kuperkar, K., Abezgauz, L., Danino, D. et al. Structural investigation of viscoelastic micellar water/CTAB/NaNO3 solutions. Pramana - J Phys 71, 1003–1008 (2008). https://doi.org/10.1007/s12043-008-0214-x
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DOI: https://doi.org/10.1007/s12043-008-0214-x