Viscoelastic micellar water/CTAB/NaNO3 solutions: Rheology, SANS and cryo-TEM analysis
Abstract
Aqueous micellar solutions of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) and sodium nitrate (NaNO(3)) were examined using steady and dynamic rheology, small-angle neutron scattering (SANS) and cryogenic-transmission electron microscopy (cryo-TEM). Upon addition of NaNO(3), the CTAB spherical micelles transform into long, flexible wormlike micelles, conveying viscoelastic properties to the solutions. The zero-shear viscosity (eta(0)) versus NaNO(3) concentration curve exhibits a well-defined maximum. Likewise, upon increase in temperature, the viscosity decreases. Dynamic rheological data of the entangled micellar solutions can be well described by the Maxwell model. Changes in the structural parameters of the micelles with addition of NaNO(3) were inferred from SANS measurements. The intensity of scattered neutrons at the low q region was found to increase with increasing NaNO(3) concentration. This suggests an increase in size of the micelles and/or decrease of intermicellar interactions with increasing salt concentration. Analysis of the SANS data using prolate ellipsoidal structure and Yukawa form of interaction potential between micelles indicates that addition of NaNO(3) leads to a decrease in the surface charge of the ellipsoidal micelles and consequently an increase in their length. The structural transition from spherical to entangled threadlike micelles, induced by the addition of NaNO(3) to CTAB micelles is further confirmed by cryo-TEM.
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Yang et al. found spherical micelles of C12N4N at pH 6.99, worm-like micelles at pH 8.27 and a micelle-to-vesicle transition at pH 9.43, confirming that aggregates morphology varies moving from acidic to basic conditions.
“Yang et al. [183] found spherical micelles of N-dodecyl-1, 4-diaminobutane (C 12 N 4 N) at pH 6.99, worm-like micelles at pH 8.27 and a micelleto-vesicle transition at pH of 9.43, confirming that aggregates morphology varies moving from acidic to basic conditions.”
From Polymeric micelles in drug delivery: An insight of the techniques for their characterization and assessment in biorelevant conditions (2021) · cites this paper as [183]
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- Authors
- Kuperkar, K., Abezgauz, L., Danino, D., Verma, G., Hassan, P. A., Aswal, V. K., Varade, D., & Bahadur, P.
- Affiliations
- Veer Narmad South Gujarat University (IN)
- Technion – Israel Institute of Technology (IL)
- Bhabha Atomic Research Centre (IN)
- Yokohama National University (JP)
- Corresponding author
- Bahadur, P.
- Venue
- Journal of Colloid and Interface Science
- Publisher
- Elsevier BV
- Published
- 2008-07
- Volume
- 323
- Issue
- 2
- Pages
- 403-409
- ISSN
- 0021-9797 (ISSN-L)
- OpenAlex
- W2037414766
- Cited by
- 108
- References
- 38
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 4 · 2023: 8 · 2022: 16 · 2021: 10 · 2020: 4 · 2018: 4 · 2017: 3 · 2016: 10 · 2015: 13 · 2014: 9 · 2013: 4 · 2012: 8
- FWCI
- 2.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Colloid and Interface Science (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Organic Chemistry › Surfactants and Colloidal Systems
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Rheology and Fluid Dynamics Studies
- Physical Sciences › Environmental Science › Environmental Chemistry › Environmental Chemistry and Analysis
- Keywords
- CTAB micelles, sodium nitrate, wormlike micelles, viscoelasticity, cationic surfactants, zero-shear viscosity, Maxwell model, micelle size, intermicellar interactions, surface charge
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