期刊
COLLOID AND POLYMER SCIENCE
卷 287, 期 1, 页码 81-87出版社
SPRINGER
DOI: 10.1007/s00396-008-1956-1
关键词
Cardanol; Cashew-nut shell liquid; Ionic surfactant; Micellization process; Adsorption process
资金
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-Brazilian National Counsel of Technological and Scientific Development)
- ANP (Agencia Nacional do Petroleo-Brazilian National Agency of Petroleum, Natural Gas and Biofuels)
A sulfonate (2,4-sodium dissulfonate-5-n-pentadecylphenol) was synthesized from hydrogenated cardanol and the micellization study was carried out using temperature and electrolyte concentration as variables. The adsorption parameters were obtained using surface tension data by the Frumkin adsorption model and the Simplex Nelder-Mead method. Values of critical micelle concentration (cmc) and surface excess (I) were obtained in three different temperatures (303 K, 313 K, and 323 K) and two electrolyte concentrations (NaCl solution-0.1 M and 0.25 M). It was verified that cmc decreased with increasing electrolyte concentration and temperature. The Gibbs free energy showed that the micellization process was spontaneous for all studied systems and temperatures, and also that the presence of several CH2 groups was significant for micelle formation.
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