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Colloid and Polymer Science

, Volume 297, Issue 2, pp 271–283 | Cite as

A reverse lyotropic liquid crystal formed by cetylpyridiniumchloride in cyclohexane with the assistance of aromatic counterions

  • Pan-pan Gu
  • Jian-xi ZhaoEmail author
Original Contribution
  • 39 Downloads

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, ηL, of the samples at W0 = 32 was 3.3 × 105, 2.0 × 104, and 6.8 × 102 Pa·s for CPC/NaBzs, CPC/NaNphs, and CPC/NaSal, respectively, at 25 °C. The corresponding elastic plateau moduli, GP, were 1.9 × 103, 1.1 × 103, and 1.1 × 102 Pa, respectively. The temperature effect was examined for samples at W0 = 32, which were found to retain high viscosity at higher temperatures, for example, the relative viscosity to solvent cyclohexane, ηr, reached 107 and 105 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 

Notes

Funding information

Financial support was from the National Natural Science Foundation of China (Grant no. 21473032).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

396_2018_4466_MOESM1_ESM.doc (540 kb)
ESM 1 (DOC 540 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical EngineeringFuzhou UniversityFuzhouChina

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