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. 2017 Sep 1;2(9):5324-5334.
doi: 10.1021/acsomega.7b00428. eCollection 2017 Sep 30.

Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

Avinash Bhadani  1 , Ananda Kafle  1 , Setsuko Koura  2 , Kenichi Sakai  1 , Hideki Sakai  1 , Masahiko Abe  1
Affiliations

Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

Avinash Bhadani et al. ACS Omega. .

Abstract

The micellar solution and the lyotropic liquid crystalline phases formed by gemini surfactants containing morpholinium headgroups are investigated for their self-aggregation and physicochemical properties in water. These gemini surfactants demonstrated good surface activity because they are able to undergo micellization at lower concentration and form nanosized micellar aggregates in dilute aqueous solution. The binary mixture of the morpholinium gemini surfactant-water system is investigated over a wide range of concentrations. The micellar solution of the morpholinium gemini surfactants demonstrated Newtonian fluidlike behavior between 10 and 50 wt % as the observed viscosities were independent of the applied shear rate. At higher concentration, morpholinium geminis formed self-assembled lyotropic phases in water. These liquid crystalline phases were characterized by small-angle X-ray scattering and polarized optical microscopy techniques.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Molecular structure of morpholinium gemini surfactants synthesized and investigated.
Figure 2
Figure 2
Surface tension vs log C plot for the morpholinium gemini surfactants.
Figure 3
Figure 3
Specific conductivity vs concentration plot and corresponding derived plot using mathematical eqs 3 and 4 for [C12MOR(6)C12MOR]2Br at 25 °C. The arrow shown in the figure represents the cmc value.
Figure 4
Figure 4
Size distribution of micelles formed by (a) [C12MOR(6)C12MOR]2Br and (b) [C14MOR(6)C14MOR]2Br at different surfactant concentrations investigated at 25 °C.
Figure 5
Figure 5
Viscosity vs steady shear rate curves of (a) [C12MOR(6)C12MOR]2Br and (b) [C14MOR(6)C14MOR]2Br.
Figure 6
Figure 6
Phase diagram of (i) [C12MOR(6)C12MOR]2Br–H2O system and (ii) [C14MOR(6)C14MOR]2Br–H2O system at 25 °C. L1 notifies micellar phase, H1 notifies lyotropic hexagonal phase, and S notifies solid phase.
Figure 7
Figure 7
POM images of the morpholinium gemini surfactant at different wt % in water.
Figure 8
Figure 8
SAXS curves for (a) [C12MOR(6)C12MOR]2Br–H2O system and (b) [C14MOR(6)C14MOR]2Br–H2O system observed at 25 °C at different concentrations. (c) Calculated lattice parameter (α) vs surfactant concentration plot for morpholinium gemini surfactants.
See this image and copyright information in PMC

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