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Abstract
The thermotropic and lyotropic mesomorphism of 4-dodecyloxy-2-hydroxybenzoic acid and sodium 4-dodecyloxy-2-hydroxybenzoate have been determined by a combination of optical microscopy, differential scanning calorimetry and NMR methods. While the free acid shows thermotropic N and Sc mesophases, its sodium salt shows lyotropic hexagonal (H1), lamellar (Lα) and intermediate phases.