Abstract
The formation of high-concentration mesophases by a cationic azobenzene photosurfactant is described for the first time. Using a combination of polarised optical microscopy and small-angle X-ray scattering, optically anisotropic, self-assembled structures with long-range order are reported. The mesophases are disrupted or lost upon UV irradiation.
Highlights
We report the high-concentration self-assembly behaviour of the AzoTAB, C8AzoOC2TAB (Fig. 1a)
While the formation of lyotropic liquid crystal (LLC) phases has been described for neutral azobenzene photosurfactants (AzoPS),[28,29,30,31] no such accounts exist for AzoTABs
Some assumptions can be made to account for the absence of definitive peak spacing ratios in the small-angle X-ray scattering (SAXS) profiles: (1) it is not uncommon for such systems to form swollen phases,[38] and have obscured scattering peaks; (2) it is expected that more Bragg peaks will emerge at higher concentrations.[28,29,30]
Summary
We report the high-concentration self-assembly behaviour of the AzoTAB, C8AzoOC2TAB (Fig. 1a). High concentration solutions of C8AzoOC2TAB (10–40 wt% in water) were analysed using polarised optical microscopy (POM), small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC) to determine the phase behaviour in this concentration regime.
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