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《Dynamic Surface Tension of Aqueous Surfactant Solutions 8. Effect of Spacer on Dynamic Properties of Gemini Surfactant Solutions》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、JOURNALOFCOLLOIDANDINTERFACESCIENCE179,261±268(1996)ARTICLENO.0212DynamicSurfaceTensionofAqueousSurfactantSolutions8.EffectofSpaceronDynamicPropertiesofGeminiSurfactantSolutions1MILTONJ.ROSENANDLID.SONGSurfactantResearchInstitute,BrooklynCollegeoftheCityUniversityofNewYork,Brooklyn,NewY
2、ork11210ReceivedMay30,1995;acceptedSeptember22,1995hydrophilicgroupsontheequilibriumpropertiesoftheseTwoseriesofcationicsurfactants,eachwithtwohydrophilicmaterials(1±5).andtwohydrophobicgroupsinthemolecule(``gemini''surfac-Inordertoinvestigatetheeffectofthespaceringeminitants),havebeens
3、ynthesized.Oneserieshasarigid,hydrophobicsurfactantsonthedynamicsurfacetensionoftheiraqueousspacer,andthesecond,a¯exible,morehydrophilicone.Thedy-solutions,twoseriesofgeminisurfactants,onewitharigid,namicbehavioroftheiraqueoussolutionshasbeenstudiedbythemaximumbubblepressuremethod.Thenv
4、alue(dynamichydrophobicspacerandonewitha¯exible,hydrophilicone,adsorptionparameter)inbothseriesincreaseswithanincreaseinweresynthesized.Dynamicsurfacetensionwasmeasuredthealkylchainlength.Thisincreaseislargerinthegeminiswithatdifferenttemperatures,surfactantconcentrations,andso-a¯exible
5、hydrophilicspacer.Theinductiontime,ti,ofthegeminislutionionicstrengths.witha¯exible,hydrophilicspacerislargerthanthatofthegeminisDynamicsurfacetensiondatacanbedescribedverywellwitharigid,hydrophobicspacerundersimilarconditions,proba-bytheequation(6)blybecausethechain±chaininteractionoft
6、heformercanformlargerlinearaggregates,whichhasbeencon®rmedbyviscosityn(g00gt)/(gt0gm)(t/t*),[1]measurements.Adsorptionattheair/solutioninterfaceofallthecompoundsstudiedisdiffusion-controlled,asindicatedbythe®tofthedynamicdatatothelongtimeadsorptionequation.Thewheregtisthesurfacetensiono
7、fthesurfactantsolutionatsurfacecoverageattheendoftheinductionperiod,forallthesurfaceage(time)t,gmisthemeso-equilibriumsurfacecompoundsstudiedandatdifferentconcentrations,isintherangetension(wheregtshowsonlyasmallchangewithtime),54±69%.Thismeansthatbeforetheinterfacialtensioncan
