Phenyl siloxane hybrid xerogels: structure and porous texture

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dc.contributor.authorMoriones Jiménez, Paula
dc.contributor.authorEcheverría Morrás, Jesús
dc.contributor.authorParra, Bernardo
dc.contributor.authorGarrido Segovia, Julián José
dc.contributor.departmentZientziakeu
dc.contributor.departmentInstitute for Advanced Materials and Mathematics - INAMAT2en
dc.contributor.departmentCienciases_ES
dc.contributor.funderGobierno de Navarra / Nafarroako Gobernuaes
dc.date.accessioned2019-11-07T10:38:42Z
dc.date.available2020-03-26T00:00:12Z
dc.date.issued2019
dc.descriptionThis is a post-peer-review, pre-copyedit version of an article published in Adsorption. The final authenticated version is available online at: https://doi.org/10.1007/s10450-019-00075-9en
dc.description.abstractThe aim of this research is to investigate the effect of phenyltriethoxysilane (PhTEOS) and tetraethoxysilane (TEOS) molar ratios as silicon precursors on the structure and porous texture of xerogels. We have prepared phenyl-silane hybrid xerogels from mixtures of PhTEOS and TEOS at pH 10 and 333 K, using ethanol as a solvent. Characterization techniques include 29Si NMR, FTIR, XRD, FE-SEM, HRTEM, TGA-DSC, helium density, and gas adsorption (N2 at 77 K and CO2 at 273 K). In order to assess the contribution of the quadrupolar moment of N2 and CO2 in the adsorption we obtained the adsorption– desorption isotherm of Ar at 87.3 K for the xerogel synthesized from 50% PhTEOS. The morphology of xerogels changed from aggregates of spherical particles for 20% PhTEOS to lamellae for samples obtained with PhTEOS percentages equal or larger that 60%. The incorporation of phenyl groups into the xerogel matrix caused an increase in the spacing bond between silicon atoms and led to an intramolecular reaction and the formation of lamellar domains. Increasing the PhTEOS molar ratio in the mixture of silicon precursors produced hybrid xerogels with lower specific surface area, pore volume and characteristic energy. The similarity between the isotherms of N2 at 77 K and Ar at 87.3 K indicates that the main retention mechanism is physisorption and that the variation in the surface chemistry with the incorporation of phenyl groups doesn’t inhibit the retention of N2.en
dc.description.sponsorshipThis work was backed by the Ministerio de Ciencia y Tecnología (Grant No. CTQ2009-07993) and by the Ministerio de Economía, Industria y Competitividad (Grant No. MAT2016-78155-C2-2-R). Paula Moriones is grateful to the Departamento de Industria y Tecnología, Comercio y Trabajo of the Navarre Government for the fellowships granted (Ref. Number 175/01/08 and 269/01/08, respectively).en
dc.embargo.lift2020-03-26
dc.embargo.terms2020-03-26
dc.format.extent13 p.
dc.format.mimetypeapplication/pdfen
dc.format.mimetypeapplication/zipen
dc.identifier.doi10.1007/s10450-019-00075-9
dc.identifier.issn1572-8757
dc.identifier.urihttps://academica-e.unavarra.es/handle/2454/35316
dc.language.isoengen
dc.publisherSpringer USen
dc.relation.ispartofAdsorption (2019)en
dc.relation.projectIDinfo:eu-repo/grantAgreement/ES/1PE/MAT2016-78155/
dc.relation.publisherversionhttps://doi.org/10.1007/s10450-019-00075-9
dc.rights© Springer Science+Business Media, LLC, part of Springer Nature 2019en
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.subjectSol–gelen
dc.subjectPhenyltriethoxysilaneen
dc.subjectHybrid xerogelsen
dc.subjectPorous textureen
dc.titlePhenyl siloxane hybrid xerogels: structure and porous textureen
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dspace.entity.typePublication
relation.isAuthorOfPublicationa287a485-ae61-4895-850d-12a72a80db2a
relation.isAuthorOfPublicationbee020b1-46cd-4667-86be-7f2f4c4ade3b
relation.isAuthorOfPublicationa1dc7e87-ac55-4720-b78e-455e2c300cac
relation.isAuthorOfPublication.latestForDiscoverya287a485-ae61-4895-850d-12a72a80db2a

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