A reverse lyotropic liquid crystal formed by cetylpyridiniumchloride in cyclohexane with the assistance of aromatic counterions Original Contribution First Online: 02 January 2019 Abstract
The self-assembly of the cationic surfactant cetylpyridiniumchloride (CPC) in cyclohexane was studied using polarizing-microscopy (POM), small angle X-ray scattering (SAXS), and rheology measurements. Homogeneous solutions of CPC/aromatic salts were produced using aromatic salts, specifically, NaBzs, NaNphs, or NaSal. The majority of the samples showed highly viscous gel-like appearances. SAXS measurements together with POM observations indicate hexagonal liquid crystals in both the CPC/NaNphs and CPC/NaSal, while multiple types of aggregates were shown to co-exist in the CPC/NaBzs. These were attributed to the interactions of aromatic counterions with the pyridinium head-group of CPC, resulting in increased size of the CPC head to different extents depending on the aromatic counterions. The formation of core-shell aggregates consequently caused further packing into liquid crystals. The specific role of NaSal that carried an
ortho-hydroxyl in its benzene ring is discussed, and the mechanism of trace water molecules bridging neighboring NaSal molecules was revealed according to Fourier transform infrared (FT-IR) measurements. The samples had high viscoelasticity, for example, the steady-state low-shear viscosity at a shear rate of 0.001, η L, of the samples at W 0 = 32 was 3.3 × 10 5, 2.0 × 10 4, and 6.8 × 10 2 Pa·s for CPC/NaBzs, CPC/NaNphs, and CPC/NaSal, respectively, at 25 °C. The corresponding elastic plateau moduli, G′ P, were 1.9 × 10 3, 1.1 × 10 3, and 1.1 × 10 2 Pa, respectively. The temperature effect was examined for samples at W 0 = 32, which were found to retain high viscosity at higher temperatures, for example, the relative viscosity to solvent cyclohexane, η r, reached 10 7 and 10 5 for CPC/NaBzs and CPC/NaNphs, respectively, at 70 °C. Graphical abstract
Cetylpyridiniumchloride (CPC), together with aromatic salt, sodium 2-naphthalenesulfonate, or sodium salicylate, was dissolved in cyclohexane to form inverted hexagonal liquid crystals.
Keywords Ionic surfactant Aromatic counterions Homogeneous cyclohexane solutions Inverted liquid crystallines Electronic supplementary material
The online version of this article (
) contains supplementary material, which is available to authorized users. https://doi.org/10.1007/s00396-018-04466-2 Notes Funding information
Financial support was from the National Natural Science Foundation of China (Grant no. 21473032).
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