The　adsorption　and　the　micellization　of　a　series　of　cationic　Gemini　surfactants,　alkanediyl-bis(dimethyldodecylammonium　bromide),　referred　as　12-s-12,　in　the　isopropyl　myristate　(IPM)/aqueous　system　have　been　investigated　using　interfacial　tension　measurements.　These　surfactants　showed　much　stronger　ability　for　their　adsorption　at　the　IPM/water　interface　and　micellization　in　the　water　phase　in　comparison　with　the　corresponding　monomer,　C　12TABr.　The　adsorption　and　micellization　behavior　of　12-s-12　was　found　to　strongly　depend　on　the　length　of　spacer　chain,　which　was　comparable　with　those　studied　previously　in　the　air/water　system.　Compared　with　the　compounds　with　short　spacer　chain,　the　12-s-12　having　a　long　spacer　chain　(s≥12)　showed　complicated　behavior　for　their　adsorption　and　micellization　due　to　the　bending　of　the　long　spacer　chain.　Thus,　the　adsorption　process　could　be　divided　into　two　stages.　At　the　beginning　stage,　the　adsorption　was　diffusion-only　controlled　and　the　long　spacer　chain　had　a　free　conformation　on　the　interface.　At　the　second　stage,　more　12-s-12　molecules　crowd　into　the　adsorption　layer　and　forced　the　long　spacer　chain　to　bend　strongly　in　order　to　make　room　for　the　new　molecules.　This　resulted　in　more　and　more　tight　packing　of　the　molecules　on　the　interface　and　thus　a　quite　large　limiting　dilational　elasticity　for　12-16-12　and　12-18-12.　The　addition　of　salt　greatly　promoted　the　adsorption　and　micellization　of　12-s-12.　The　present　results　suggested　that　the　12-s-12　with　s≥12　may　be　a　good　emulsifier　to　construct　stable　emulsion.　©　Springer-Verlag　2010.