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The nature and strength of the interactions between the 1,3-bis(dimethylhexadecyl)propanediammonium dibromide (16-3-16) gemini surfactant and a homologous series of nonionic polyoxyethylene (20) sorbitan ester surfactants having laurate (Tween 20), stearate (Tween 60), or oleate (Tween 80) alkyl tails has been investigated. The critical micelle concentration (cmc) values of the mixed gemini-tween systems were determined using the du Notly ring surface tension method, and the results have been analyzed using Clint's, Rubingh's, Motomura's, and Maeda's theories for mixed micellar systems. The results demonstrate a synergistic mixing behaviour between the Tween surfactants and the 16-3-16 gemini surfactant, where the strength of interaction is dependent upon the chain length and saturation of the Tween alkyl tail. Key words: gemini surfactants, Tween surfactants, mixed micelles, surface tension. On a etudie la nature et la force des interactions entre l'agent de surface jumeau dibromure de 1,3- bis(dimethylhexadecyl)propanediammonium (16-3-16) et une serie d'agents de surface non ioniques a base d'ester de polyoxyethylene (20) sorbitane comportant des chaines alkyles du laurate (Tween 20), du stearate (Tween 60) ou oleate (Tween 80). On a determine; les valeurs de concentration micellaire critique (cmc) des systemes mixtes jumeau-Tween en faisant appel a la methode de la tension superficielle des anneaux de Noiiy et on a analyse les resultats a l'aide des theories de Clint, de Rubingh, de Motomura et de Maeda pour les systemes micellaires mixtes. Les resultats mettent en evidence un comportement de melange synergistique entre les agents de surface de la famille Tween et l'agent de surface jumeau 16-3-16 et la force de l'interaction depend de la longueur et de la saturation de la chaine alkyle du Tween. Mots-cles: agents de surface jumeaux, agents de surface Tween, micelles mixtes, tension superficielle. [Traduit par la Redaction], Introduction Gemini surfactants represent an intriguing class of surfactants that have been extensively studied by various research groups since the late 1980s. Their unique structure, which consists of two typical [...]