Hybrid xerogels: study of the sol-gel process and local structure by vibrational spectroscopy

Cruz Quesada, Guillermo; Espinal Viguri, Maialen; López Ramón, María Victoria; Garrido Segovia, Julián José

Publication:
Hybrid xerogels: study of the sol-gel process and local structure by vibrational spectroscopy

dc.contributor.author	Cruz Quesada, Guillermo
dc.contributor.author	Espinal Viguri, Maialen
dc.contributor.author	López Ramón, María Victoria	es_ES
dc.contributor.author	Garrido Segovia, Julián José
dc.contributor.department	Zientziak	eu
dc.contributor.department	Institute for Advanced Materials and Mathematics - INAMAT2	en
dc.contributor.department	Ciencias	es_ES
dc.contributor.funder	Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa	es
dc.date.accessioned	2022-01-11T09:29:27Z
dc.date.available	2022-01-11T09:29:27Z
dc.date.issued	2021
dc.description.abstract	The 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.sponsorship	The 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.extent	16 p.
dc.format.mimetype	application/pdf	en
dc.identifier.doi	10.3390/polym13132082
dc.identifier.issn	2073-4360
dc.identifier.uri	https://academica-e.unavarra.es/handle/2454/41700
dc.language.iso	eng	en
dc.publisher	MDPI
dc.relation.ispartof	Polymers, 13 (13)
dc.relation.projectID	info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-78155-C2-2-R	en
dc.relation.projectID	info:eu-repo/grantAgreement/MICIU/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/FPU18%2F03467	en
dc.relation.publisherversion	http://doi.org/10.3390/polym13132082
dc.rights	© 2021 by the authors. Creative Commons Attribution	en
dc.rights.accessRights	info:eu-repo/semantics/openAccess	en
dc.rights.accessRights	Acceso abierto / Sarbide irekia	es
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/
dc.subject	(SiO)x structures	en
dc.subject	Chloroalkyltriethoxysilanes	en
dc.subject	FTIR	en
dc.subject	Hybrid materials	en
dc.subject	Inductive effect	en
dc.subject	ORMOSILs	en
dc.subject	Xerogels	en
dc.title	Hybrid xerogels: study of the sol-gel process and local structure by vibrational spectroscopy	en
dc.type	info:eu-repo/semantics/article	en
dc.type	Artículo / Artikulua	es
dc.type.version	info:eu-repo/semantics/publishedVersion	en
dc.type.version	Versión publicada / Argitaratu den bertsioa	es
dspace.entity.type	Publication
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