This　paper　reports　the　adsorption　and　interfacial　viscoelasticity　of　gemini　surfactants　with　a　hydroxyl-substituted　spacer,　2-hydroxyl-propanediyl-alpha,omega-bis(dimethyldodecylammonium　bromide),　2-hydroxyl-butanediyl-alpha,omega-bis(dimethyldodecylammonium　bromide),　and　2,3-hydroxyl-butanediyl-alpha,omega-bis(dimethyldodecylammonium　bromide),　referred　to　as　12-3(OH)-12,　12-4(OH)-12,　and　12-4(OH)(2)-12,　respectively,　at　the　air/water　interface　using　dropping　shape　and　interface　dilational　rheology　measurements.　For　comparison,　the　unsubstituted　surfactants　were　also　examined　at　identical　conditions.　The　results　showed　that　substituted　surfactants　produced　a　remarkably　higher　interfacial　elasticity　than　the　corresponding　unsubstituted　ones.　This　was　attributed　to　the　effect　of　the　intermolecular　hydrogen　bonding　occurring　between　the　hydroxyl-substituted　spacers　of　adsorbed　molecules,　which　resulted　in　tighter　packing　of　the　molecules　in　the　monolayer.　Besides,　we　measured　foam　stability.　The　foam　produced　by　the　substituted　geminis　was　found　to　have　higher　stability　than　that　by　the　unsubstituted　geminis.　It　was　suggested　that　the　foam　stability　may　be　related　to　the　limit　elasticity　of　interfacial　film　at　the　level　of　identical　surface　excesses.