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dc.contributor.authorDemirörs, A. F.en_US
dc.contributor.authorEser, B. E.en_US
dc.contributor.authorDag, Ö.en_US
dc.date.accessioned2016-02-08T10:23:43Z
dc.date.available2016-02-08T10:23:43Z
dc.date.issued2005en_US
dc.identifier.issn0743-7463
dc.identifier.urihttp://hdl.handle.net/11693/24074
dc.description.abstractThe triblock poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) copolymers, Pluronics (L64, P65, and P123), form liquid crystalline (LC) mesophases with transition metal nitrate salts (TMS), [M(H2O) n] (NO3)2, in the presence and absence of free water in the media. In this assembly process, M-OH2 plays an important role as observed in a TMS:CnEOm (C nEOm is oligo(ethylene oxide) nonionic surfactants) system. The structure of the LC mesophases and interactions of the metal ion-nitrate ion and metal ion-Pluronic were investigated using microscopy (POM), diffraction (XRD), and spectroscopy (FTIR and micro-Raman) techniques. The TMS:L64 system requires a shear force for mesophase ordering to be observed using X-ray diffraction. However, TMS:P65 and TMS:P123 form well structured LC mesophases. Depending on the salt/Pluronic mole ratio, hexagonal LC mesophases are observed in the TMS:P65 systems and cubic and tetragonal LC mesophases in the TMS:P123 systems. The LC mesophase in the water/salt/Pluronic system is sensitive to the concentration of free (H2O) and coordinated water (M-OH2) molecules and demonstrates structural changes. As the free water is evaporated from the H2O:TMS:Pluronic LC mesophase (ternary mixture), the nitrate ion remains free in the media. However, complete evaporation of the free water molecules enforces the coordination of the nitrate ion to the metal ion in all TMS:Pluronic systems. © 2005 American Chemical Society.en_US
dc.language.isoEnglishen_US
dc.source.titleLangmuiren_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/la047136len_US
dc.subjectConcentration (process)en_US
dc.subjectCopolymersen_US
dc.subjectLiquid crystalsen_US
dc.subjectNitratesen_US
dc.subjectPolyethylenesen_US
dc.subjectSaltsen_US
dc.subjectSurface active agentsen_US
dc.subjectX ray diffraction analysisen_US
dc.subjectIon densityen_US
dc.subjectNitrate saltsen_US
dc.subjectPluronicsen_US
dc.subjectSolid materialsen_US
dc.subjectTransition metalsen_US
dc.titleLiquid crystalline mesophases of pluronics (L64, P65, and P123) and transition metal nitrate salts ([M(H2O)6](NO 3)2)en_US
dc.typeArticleen_US
dc.departmentDepartment of Chemistry
dc.citation.spage4156en_US
dc.citation.epage4162en_US
dc.citation.volumeNumber21en_US
dc.citation.issueNumber9en_US
dc.identifier.doi10.1021/la047136len_US
dc.publisherAmerican Chemical Societyen_US


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