The　formation　and　the　properties　of　wormlike　micelles　in　aqueous　solutions　of　mixed　cationic　and　anionic　gemini　surfactants,　2-hydroxyl-propanediyl-alpha-omega-bis(dimethyldodecylammonium　bromide)　(12-3(OH)-12)　and　O,O＇-bis(sodium　2-dodecylcarboxylate)-p-benzenediol　(C-12　phi　C-12),　have　been　studied　by　steady-state　and　dynamic　rheological　measurements　at　25　degrees　C.　With　the　addition　of　a　small　amount　of　C-12　phi　C-12　into　the　solution　of　12-3(OH)-12,　the　total　surfactant　concentration　of　which　was　always　kept　at　80　mmol　L-1,　the　solution　viscosity　was　strongly　enhanced　and　its　maximum　was　much　larger　than　that　of　the　mixed　system　of　propanediyl-alpha-omega-bis(dimethyldodecylammonium　bromide)　(12-3-12)　and　C-12　phi　C-12.　The　results　of　dynamic　rheology　measurements　showed　that　12-3(OH)-12/C-12　phi　C-12　formed　longer　wormlike　micelles　in　comparison　with　12-3-12/C-12　phi　C-12.　This　was　attributed　to　the　effect　of　hydrogen　bonding　occurring　between　12-3(OH)-12　molecules,　which　was　an　effective　driving　force　promoting　micellar　growth.　As　few　C-12　phi　C-12　participated　in　the　micelles,　the　electrostatic　attraction　between　the　oppositely　charged　head　groups　of　12-3(OH)-12　and　C-12　phi　C-12　made　the　molecules　in　the　aggregates　pack　more　tightly.　This　reinforced　the　hydrogen-bonding　interactions　and　greatly　promoted　the　micellar　growth.　(C)　2010　Elsevier　Inc.　All　rights　reserved.