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The aggregation ofn-dodecanephosphonic acid in water
Authors:R M Minardi  P C Schulz  B Vuano
Institution:(1) Department of Chemistry and Chemical Engineering, Universidad Nacional del Sur Bahia Blanca, Argentina
Abstract:Several techniques were employed to study the aggregation ofn-Dodecanephosphonic Acid (DPA) in water. At 22°C, the solubillity of DPA increases, probably due to the formation of small premicellar aggregates. The CMC is (5.4±2.4) ×10–4 mol·dm–3 and the solubility reaches the CMC value at 26°C. At 30°C and at a concentration of about 9×10–3 mol·dm–3, a lamellar mesophase appears. Both micelles and liquid crystal lamellae are almost uncharged. Their polar heads have strong hydrogen bonds between them. The ionization of DPA molecules in micelles and mesophase structures is strongly reduced in comparison with monomerically dissolved molecules.
Keywords:Micelles  critical micelle concentration  dodecanephosphonic acid
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