0000000000368735

AUTHOR

Valentina Villari

showing 2 related works from this author

Effects of isotopic substitution on the conformational properties of polymeric aqueous solutions

2000

Abstract This work deals with a side-by-side comparison between the PEO conformational properties in H 2 O and D 2 O. The gyration radius, evaluated by SANS, the hydrodynamic radius, evaluated by PCS, and the Raman D-LAM band analysis furnish valuable information on the structural arrangement of the molecules. The findings clearly show different behavioural properties of the polymer in H 2 O and D 2 O.

chemistry.chemical_classificationHydrodynamic radiusMaterials scienceRadiusPolymerCondensed Matter PhysicsGyrationSmall-angle neutron scatteringElectronic Optical and Magnetic Materialssymbols.namesakechemistrysymbolsMoleculePhysical chemistryElectrical and Electronic EngineeringRaman spectroscopyRaman scattering
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Quasi-elastic light scattering in polymer-containing microemulsion

1996

Abstract Quasi-elastic light scattering (QELS) was performed in dilute water in oil microemulsion stabilized by AOT surfactant. The water-soluble polyethylene oxide (PEO) with low molecular weight (8000) added to the microemulsion seems to be confined within the aqueous microphase, since PEO is insoluble in oil (n-heptane). The measurements by QELS of diffusion coefficient, at dilute concentrations, allow determination of the size of the droplets. The phase diagram of the microemulsion undergoes remarkable changes on addition of the polymer. The results show that at fixed R ( water surfactant ratio) the droplets decrease their size as the concentration of polymer increases. This occurrence …

chemistry.chemical_classificationAqueous solutionChromatographyHydrodynamic radiusDiffusionOrganic Chemistrytechnology industry and agriculturePolymerLight scatteringAnalytical ChemistryInorganic ChemistryReduced propertieschemistryPulmonary surfactantChemical engineeringMicroemulsionSpectroscopyJournal of Molecular Structure
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