Effect of the spacer length on the association and adsorption behavior of dissymmetric gemini surfactants |
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Authors: | Sikirić M Primozic I Talmon Y Filipović-Vinceković N |
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Institution: | Department of Physical Chemistry, Ruder Boskovi? Institute, Zagreb, Croatia. |
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Abstract: | A series of dissymmetric gemini surfactants with the general formula C12H25(CH3)2N(CH2)sN(CH3)2C14H29]Br2 designed as 12-s-14, where s=2, 6, and 10, were synthesized and their physicochemical properties investigated. The effect of spacer length on Krafft temperature, adsorption at the air/solution interface, and association in aqueous solution was studied by tensiometry, conductometry, and cryo-transmission electron microscopy. The Krafft temperature was found to increase linearly with spacer length. In the submicellar concentration range the dissymmetric 12-s-14 surfactants display ion pairing and premicellar association. Adsorption at air/solution interfaces and micellization in aqueous solution are similar to the behavior of their symmetric counterparts and depend strongly on spacer length. |
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