Flexibility of the triblock copolymers modulating their penetration and expulsion mechanism in Langmuir monolayers of dihexadecyl phosphoric acid

dc.creatorCaseli, L
dc.creatorNobre, TM
dc.creatorSilva, DAK
dc.creatorLoh, W
dc.creatorZaniquelli, MED
dc.date2001
dc.dateDEC
dc.date2014-11-18T13:45:52Z
dc.date2015-11-26T17:29:17Z
dc.date2014-11-18T13:45:52Z
dc.date2015-11-26T17:29:17Z
dc.date.accessioned2018-03-29T00:16:18Z
dc.date.available2018-03-29T00:16:18Z
dc.identifierColloids And Surfaces B-biointerfaces. Elsevier Science Bv, v. 22, n. 4, n. 309, n. 321, 2001.
dc.identifier0927-7765
dc.identifierWOS:000171409800005
dc.identifier10.1016/S0927-7765(01)00197-7
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/67486
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/67486
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/67486
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1285244
dc.descriptionThe surface activity of the poly-[block (ethylene oxide)]-poly [block (propylene oxide)]-poly [block (ethylene oxide)] copolymers (EO)(x)-(PO)(x)-(EO)(x) adsorbed together with dihexadecyl phosphoric acid (DHP), a synthetic phospholipid. is analyzed from their surface pressure and surface potential isotherms. The block copolymers of (EO)(x)-(PO)(y)-(EO)(x) with variable molecular weight (1100-14000) were dissolved in the subphase for DHP monolayers. The concentration of the copolymers within the aqueous subphase were selected to render an initial surface tension of 60 mN/m. The simultaneous adsorption of the copolymer and DHP is attested by the observation of a liquid expanded state at large areas, absent for pure DHP monolayers, Above some critical surface pressure all copolymers cited above are expelled from the interface. The surface potential isotherms., which give information on the component of the molecular dipole moment normal to the plane of the monolayer, are interpreted in terms of changes in the copolymer conformation as well as in terms of the copolymer desorption from the air-liquid interface. For an equal hydrophobic/hydrophilic ratio. the size of the chains or molecular weight is decisive in the mechanism of the copolymer expulsion from the air-liquid interface. (C) 2001 Elsevier Science B.V. All rights reserved.
dc.description22
dc.description4
dc.description309
dc.description321
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationColloids And Surfaces B-biointerfaces
dc.relationColloid Surf. B-Biointerfaces
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjecttriblock copolymers
dc.subjectLangmuir monolayers
dc.subjectsurface potential
dc.subjectsurface pressure
dc.subjectDHP
dc.subjectInsoluble Lipid Monolayers
dc.subjectAir-water-interface
dc.subjectBlock-copolymers
dc.subjectBlodgett Multilayers
dc.subjectAggregation Behavior
dc.subjectAqueous-solutions
dc.subjectSurface-activity
dc.subjectPropylene-oxide
dc.subjectPhase-diagrams
dc.subjectEthylene-oxide
dc.titleFlexibility of the triblock copolymers modulating their penetration and expulsion mechanism in Langmuir monolayers of dihexadecyl phosphoric acid
dc.typeArtículos de revistas


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