Abstract
The dilational rheological properties of a pair of structural isomers:sodium 2-propyl-4,5-dihexyl benzene sulfonate(366)and sodium 2,5-dipropyl-4-nonyl benzene sulfonate(393)at the air/water and decane/water interfaces were investigated by drop shape analysis method.The influences of concentration on dilational modulus were expounded.The experimental results showed that the 5-alkyl played an important role in the surface dilational modulus,while the dimension of surfactant molecule dominated the interfacial dilatinal modulus.
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