Lyotropic Aqueous 2-Picolinium Ionic Liquid Crystals and Their Shear-Induced Foams.

ABSTRACT: 1-Dodecyl-2-methylpyridinium bromide ([C₁₂-2-Pic][Br]) and 1-hexadecyl-2-methylpyridinium bromide ([C₁₆-2-Pic][Br]) are two ionic liquid crystals presenting thermotropic smectic phases above 80 °C. Aiming to take advantage of the liquid crystalline properties at lower temperatures, lyotropic aqueous systems were prepared from these two organic salts. Both systems were characterized by polarized optical microscopy (POM), X-ray powder diffraction (XRD), and fast field cycling nuclear magnetic resonance (FFC-NMR) relaxometry to assess their texture, phase structure, and molecular dynamics, respectively. The mesomorphic behavior was induced at room temperature. Moreover, the lyotropic [C₁₂-2-Pic][Br]_aq revealed a smectic phase with higher separation

SUBMITTER: Santos AFM 

PROVIDER: S-EPMC11448070 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature