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• The Structure-Function Relationship of PAMAM Dendrim

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• The Structure-Function Relationship of PAMAM Dendrimers as Robust Oil Dispersants

  PAMAMdendrimershaverecentlybeeninvestigatedasefficientandbiocompatibleoil11dispersantsutilizingtheirencapsulationcapacity;however,theirhighcationicchargedensityhas12beenshowntobecytotoxic.Itisthereforeimperativetomitigatecationiccharge-induced13toxicityandunderstandtheeffectsofsuchchanges.Presentedhereisasynergisticexperimental14andcomputationalapproachtoexaminetheeffectsofvaryingterminalsurfacechargeonthe15capacityofdendrimerstodispersemodelliner,polycyclicaromatic,andhybridhydrocarbons.16Unchargeddendrimerscollapsebyformingintra-molecularhydrogenbonds,whichreducethe17hostingcapability.Ontheotherhand,changingthesurfacechargesfrompositivetonegative18greatlyshiftsthepKaoftertiaryaminesofthePAMAMdendrimerinterior.Asaresult,the19negativelychargeddendrimershaveasignificantpercentageoftertiaryaminesprotonated,20~30%.Thisunexpectedchangeininteriorprotonationstatecauseelectrostaticinteractionswith21theanionicterminalgroups,leadingtocontractionandamarkeddecreaseinhydrocarbon22hostingcapacity.Thepresentworkhighlightstherobustnatureofdendrimeroildispersionandalsoilluminatespotentiallyunintendedorunanticipatedeffects23ofvaryingdendrimersurface24chemistryontheirencapsulationorhostingefficacy,whichisimportantfortheirenvironmental,25industrial,andbiomedicalapplications.[詳細(xì)]

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• THE RELATIONSHIP BETWEEN LOAD AND SLIDING DISTA

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