Propriedades físico-químicas do surfatante cataniônico dodecilsulfato de dodecildimetil-n-hidroxilamônio / Physical-chemical properties of catanionic surfactant dodecyldimehyl-n-hydroxylamonium dodecylsuphate

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

14/12/2009

RESUMO

The catanionic surfactant dodecyldimehyl-n-hydroxylamonium dodecylsulphate was prepared and its physical-chemical properties were characterized. The surfactant presented very low water solubility, but with ability to reduce the surface tension and the interfacial tension between water and xylene, in both situations with slow kinetics of interface saturation. The solubility in organic solvents was evaluated and the trend for higher solubility in polar solvents like ethanol and chloroform and in the aromatic solvent xylene was noticed. The evaluation of its termotropic behavior was carried out and indicated the existence of liquid crystalline phases between the solid crystalline phase and the isotropic liquid phase. The results of this study indicate the possible applications in situations where adsorption and deposition are required, and for the preparation of water in oil emulsions, with the special feature of low solubility in both phases, with the advantage of reduced skin irritation for creams and lotions. The development of this application requires advancements in the procedures for emulsion preparation in order to allow the surfactant adsorption at the water/oil interface.

ASSUNTO(S)

surfatantes cataniônico par iônico anfifílico dodecilsulfato de dodecildimetil-n-hidroxilamônio surfactants catanionic ion pair amphiphile dodecyldimehyl-n-hydroxylamonium dodecylsuphate

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