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pH-responsive diblock copolymer micelles at the silica/aqueous solution interface: Adsorption kinetics and equilibrium studies

dc.rights.licenseopen
dc.contributor.authorSAKAI, Kenichi
hal.structure.identifierUniv Newcastle, Sch Environm & Life Sci
dc.contributor.authorSMITH, Emelyn G.
hal.structure.identifierUniv Newcastle, Sch Environm & Life Sci
dc.contributor.authorWEBBER, Grant B.
hal.structure.identifierUniv Newcastle, Sch Environm & Life Sci
hal.structure.identifierLaboratoire de Chimie des polymères organiques [LCPO]
hal.structure.identifierTeam 3 LCPO : Polymer Self-Assembly & Life Sciences
dc.contributor.authorSCHATZ, Christophe
hal.structure.identifierUniv Newcastle, Sch Environm & Life Sci
dc.contributor.authorWANLESS, Erika J.
hal.structure.identifierEskisehir Osmangazi Univ, Dept Chem
dc.contributor.authorBUTUN, Vural
hal.structure.identifierDepartment of Chemistry [Sheffield]
dc.contributor.authorARMES, Steven P.
dc.contributor.authorBIGGS, Simon
dc.date.accessioned2020
dc.date.available2020
dc.date.issued2006
dc.identifier.issn1520-6106
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/20722
dc.description.abstractEnThe adsorption behavior of two examples of a weakly basic diblock copolymer, poly(2-(dimethylamino) ethyl methacrylate)-block-poly(2-(diethylamino) ethyl methacrylate) (PDMA-PDEA), at the silica/aqueous solution interface has been investigated using a quartz crystal microbalance with dissipation monitoring and an optical reflectometer. Dynamic and static light scattering measurements have also been carried out to assess aqueous solution properties of such pH-responsive copolymers. In alkaline solution, core-shell micelles are formed above the critical micelle concentration (cmc) by both copolymers, whereas the chains are molecularly dissolved (as unimers) at all concentrations in acidic solution. As a result, the adsorption behavior of PDMA-PDEA diblock copolymers on silica is strongly dependent on both the copolymer concentration and the solution pH. Below the cmc at pH 9, the cationic PDMA-PDEA copolymers adsorb as unimers and the conformation of the adsorbed polymer is essentially flat. At concentrations just above the cmc, the initial adsorption of copolymer onto the silica is dominated by the unimers due to their faster diffusion compared to the much larger micelles. Rearrangement of the adsorbed unimers and/or their subsequent displacement by micelles from solution is then observed during an equilibration period, and the final adsorbed mass is greater than that observed below the cmc. At concentrations well above the cmc, the much higher proportion of micelles in solution facilitates more effective competition for the surface at all stages of the adsorption process and no replacement of initially adsorbed unimers by micelles is evident. However, the adsorbed layer undergoes gradual rearrangement after initial adsorption. This relaxation is believed to result from a combination of further copolymer adsorption and swelling of the adsorbed layer
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enSOLVENT
dc.subject.enSILICA SURFACES
dc.subject.enSOLID/LIQUID INTERFACE
dc.subject.enBLOCK-COPOLYMERS
dc.subject.enWEAK POLYELECTROLYTE
dc.subject.enQUARTZ-CRYSTAL MICROBALANCE
dc.subject.enAQUEOUS-SOLUTION PROPERTIES
dc.subject.enCROSS-LINKED MICELLES
dc.subject.enFILMS
dc.title.enpH-responsive diblock copolymer micelles at the silica/aqueous solution interface: Adsorption kinetics and equilibrium studies
dc.typeArticle de revue
dc.identifier.doi10.1021/jp062830q
dc.subject.halChimie/Polymères
bordeaux.journalJournal of Physical Chemistry B
bordeaux.page14744-14753
bordeaux.volume110
bordeaux.hal.laboratoriesLaboratoire de Chimie des Polymères Organiques (LCPO) - UMR 5629*
bordeaux.issue30
bordeaux.institutionBordeaux INP
bordeaux.institutionUniversité de Bordeaux
bordeaux.peerReviewedoui
hal.identifierhal-00369236
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00369236v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Physical%20Chemistry%20B&rft.date=2006&rft.volume=110&rft.issue=30&rft.spage=14744-14753&rft.epage=14744-14753&rft.eissn=1520-6106&rft.issn=1520-6106&rft.au=SAKAI,%20Kenichi&SMITH,%20Emelyn%20G.&WEBBER,%20Grant%20B.&SCHATZ,%20Christophe&WANLESS,%20Erika%20J.&rft.genre=article


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