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dc.creatorCruz Quesada, Guillermoes_ES
dc.creatorEspinal Viguri, Maialenes_ES
dc.creatorLópez Ramón, María Victoriaes_ES
dc.creatorGarrido Segovia, Julián Josées_ES
dc.description.abstractThe properties of hybrid silica xerogels obtained by the sol-gel method are highly dependent on the precursor and the synthesis conditions. This study examines the influence of organic substituents of the precursor on the sol-gel process and determines the structure of the final materials in xerogels containing tetraethyl orthosilicate (TEOS) and alkyltriethoxysilane or chloroalkyltri-ethoxysilane at different molar percentages (RTEOS and ClRTEOS, R = methyl [M], ethyl [E], or propyl [P]). The intermolecular forces exerted by the organic moiety and the chlorine atom of the precursors were elucidated by comparing the sol-gel process between alkyl and chloroalkyl series. The microstructure of the resulting xerogels was explored in a structural theoretical study using Fourier transformed infrared spectroscopy and deconvolution methods, revealing the distribution of (SiO)4 and (SiO)6 rings in the silicon matrix of the hybrid xerogels. The results demonstrate that the alkyl chain and the chlorine atom of the precursor in these materials determines their inductive and steric effects on the sol-gel process and, therefore, their gelation times. Furthermore, the distribution of (SiO)4 and (SiO)6 rings was found to be consistent with the data from the X-ray diffraction spectra, which confirm that the local periodicity associated with four-fold rings increases with higher percentage of precursor. Both the sol-gel process and the ordered domains formed determine the final structure of these hybrid materials and, therefore, their properties and potential applications.en
dc.description.sponsorshipThe authors gratefully acknowledge the financial support received from the Ministerio de Economia y Competitividad of Spain (Project MAT2016-78155-C2-2-R). G.C. thanks MINECO and the 'Ministerio de Ciencia, Investigación y Universidades' of Spain for his 'FPU' grant (FPU18/03467). The authors also acknowledge the use of the 'Centro de Instrumentación Científico-Técnica' at the University of Jaén and UCTAI at the Public University of Navarre.en
dc.format.extent16 p.
dc.relation.ispartofPolymers, 13 (13)
dc.rights© 2021 by the authors. Creative Commons Attributionen
dc.subject(SiO)x structuresen
dc.subjectHybrid materialsen
dc.subjectInductive effecten
dc.titleHybrid xerogels: study of the sol-gel process and local structure by vibrational spectroscopyen
dc.typeArtículo / Artikuluaes
dc.contributor.departmentInstitute for Advanced Materials and Mathematics - INAMAT2en
dc.rights.accessRightsAcceso abierto / Sarbide irekiaes
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-78155-C2-2-Ren
dc.relation.projectIDinfo:eu-repo/grantAgreement/MICIU/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/FPU18%2F03467en
dc.type.versionVersión publicada / Argitaratu den bertsioaes
dc.contributor.funderUniversidad Pública de Navarra / Nafarroako Unibertsitate Publikoaes

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© 2021 by the authors. Creative Commons Attribution
Except where otherwise noted, this item's license is described as © 2021 by the authors. Creative Commons Attribution

El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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