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A physico-chemical investigation of poly(ethylene oxide)-block-poly(L-lysine) copolymer adsorption onto silica nanoparticles

hal.structure.identifierLaboratoire de Chimie des Polymères Organiques [LCPO]
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLOUGUET, Stéphanie
hal.structure.identifierLaboratoire de Chimie des Polymères Organiques [LCPO]
hal.structure.identifierAcharya Nagarjuna University
dc.contributor.authorKUMAR, Anitha C.
hal.structure.identifierCentre de recherches Paul Pascal [CRPP]
dc.contributor.authorSIGAUD, Gilles
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDUGUET, Etienne
hal.structure.identifierTeam 3 LCPO : Polymer Self-Assembly & Life Sciences
dc.contributor.authorLECOMMANDOUX, Sébastien
hal.structure.identifierTeam 3 LCPO : Polymer Self-Assembly & Life Sciences
dc.contributor.authorSCHATZ, Christophe
dc.date.created2011-07-15
dc.date.issued2011
dc.identifier.issn0021-9797
dc.description.abstractEnThe adsorption behavior of poly(ethylene oxide)-b-poly(t-lysine) (PEO(113)-b-PLL(10)) copolymer onto silica nanoparticles was investigated in phosphate buffer at pH 7.4 by means of dynamic light scattering, zeta potential, adsorption isotherms and microcalorimetry measurements. Both blocks have an affinity for the silica surface through hydrogen bonding (PEO and PLL) or electrostatic interactions (PLL). Competitive adsorption experiments from a mixture of PEO and PLL homopolymers evidenced greater interactions of PLL with silica while displacement experiments even revealed that free PLL chains could desorb PEO chains from the particle surface. This allowed us to better understand the adsorption mechanism of PEO-b-PLL copolymer at the silica surface. At low surface coverage, both blocks adsorbed in flat conformation leading to the flocculation of the particles as neither steric nor electrostatic forces could take place at the silica surface. The addition of a large excess of copolymer favoured the dispersion of flocs according to a presumed mechanism where PLL blocks of incoming copolymer chains preferentially adsorbed to the surface by displacing already adsorbed PEO blocks. The gradual addition of silica particles to an excess of PEO-b-PLL copolymer solution was the preferred method for particle coating as it favoured equilibrium conditions where the copolymer formed an anchor-buoy (PLL-PEO) structure with stabilizing properties at the silica-water interface
dc.language.isoen
dc.publisherElsevier
dc.subject.enSilica nanoparticles
dc.subject.enPoly(ethylene oxide)
dc.subject.enAdsorption
dc.subject.enITC
dc.subject.enDiblock copolymer
dc.subject.enPoly(L-lysine)
dc.title.enA physico-chemical investigation of poly(ethylene oxide)-block-poly(L-lysine) copolymer adsorption onto silica nanoparticles
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jcis.2011.03.093
dc.subject.halChimie/Polymères
dc.subject.halChimie/Chimie théorique et/ou physique
bordeaux.journalJournal of Colloid and Interface Science
bordeaux.page413-422
bordeaux.volume359
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00653548
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00653548v1
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