DIFFUSION-COEFFICIENTS OF AQUEOUS PHENOLS DETERMINED BY THE TAYLOR DISPERSION TECHNIQUE - EVIDENCE FOR SOLUTE ADSORPTION ON THE WALLS OF TEFLON TUBING

dc.creatorLOH, W
dc.creatorTONEGUTTI, CA
dc.creatorVOLPE, PLQ
dc.date1993
dc.date39083
dc.date2014-12-16T11:32:56Z
dc.date2015-11-26T16:56:41Z
dc.date2014-12-16T11:32:56Z
dc.date2015-11-26T16:56:41Z
dc.date.accessioned2018-03-28T23:44:08Z
dc.date.available2018-03-28T23:44:08Z
dc.identifierJournal Of The Chemical Society-faraday Transactions. Royal Soc Chemistry, v. 89, n. 1, n. 113, n. 118, 1993.
dc.identifier0956-5000
dc.identifierWOS:A1993KH27700019
dc.identifier10.1039/ft9938900113
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/61856
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/61856
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/61856
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1277450
dc.descriptionThe Taylor dispersion technique has been used to determine the diffusion coefficients of the m-alkoxyphenol and alkyl p-hydroxybenzoate homologous series in aqueous 5 x 10(-3) mol dm-3 NaOH solutions and water-ethanol mixtures. The deviations from the expected behaviour for the higher homologues increase with the eluent water content and are attributed to solute adsorption on the walls of the Teflon dispersion tube. However, the adsorption corrections performed using Golay's equation for capillary chromatography do not account for all the diffusion coefficient deviations. The experimental solute hydrodynamic radii, calculated through the Stokes-Einstein equation, decrease as the eluent ethanol content is increased. These radii are smaller than those estimated by using atomic contributions or by adding the atomic van der Waals radii to the solute optimized geometry.
dc.description89
dc.description1
dc.description113
dc.description118
dc.languageen
dc.publisherRoyal Soc Chemistry
dc.publisherCambridge
dc.publisherInglaterra
dc.relationJournal Of The Chemical Society-faraday Transactions
dc.relationJ. Chem. Soc.-Faraday Trans.
dc.rightsaberto
dc.sourceWeb of Science
dc.subjectTracer Diffusion
dc.subjectLimiting Interdiffusion
dc.subjectMolecular-diffusion
dc.subjectSelf-association
dc.subjectWater
dc.subjectCaffeine
dc.subjectSucrose
dc.subjectAcid
dc.subjectIntradiffusion
dc.subject25-degrees-c
dc.titleDIFFUSION-COEFFICIENTS OF AQUEOUS PHENOLS DETERMINED BY THE TAYLOR DISPERSION TECHNIQUE - EVIDENCE FOR SOLUTE ADSORPTION ON THE WALLS OF TEFLON TUBING
dc.typeArtículos de revistas


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