| Texto completo | |
| Autor(es): |
Tayama, Gabriel Toshiaki
;
Santagneli, Silvia Helena
;
de Oliveira Jr, Marcos
;
Messaddeq, Younes
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Physical Chemistry C; v. N/A, p. 14-pg., 2023-01-30. |
| Resumo | |
In this paper, we report the synthesis and structural characterization of transparent and photopolymerizable aluminum-phosphate-silicate hybrid materials obtained via the sol-gel route, with different aluminum/phosphate (Al/P) ratios. We explored the system Si(1-x)-(Al/P) (x) with x varying from 0.3 to 1, and atomic ratios of Al/P are 1:3, 1:1, and 3:1. All compositions contain high inorganic mass content (up to 40 wt %). Furthermore, they are compatible with vat-photopolymerization platforms. The structural evolution of the hybrid materials with the silicon concentration was investigated by SEM, phase-contrast AFM, and solid-state NMR techniques, using single-and double-resonance experiments. The structure follows the build-up principle using aluminum phosphate species and alkoxysilane chains as fundamental building blocks. These aluminum-phosphate species were identified as monomeric and dimeric chain structures by comparing different parameters obtained from NMR data to compound models. Monomeric and dimeric aluminum-phosphate chain structures were predominant in 3:1 and 1:3 Al/P ratio samples, respectively, promoting and hindering the heterocondensation with the alkoxysilane precursor, respectively. The photopolymerization mechanism leads to the percolation of the inorganic networks through a parallel polymethylmethacrylate network, resulting in a material with structural heterogeneities in the range of 5 nm, evidenced by phase-contrast AFM. (AU) | |
| Processo FAPESP: | 18/24735-3 - Correlação entre a estrutura e as propriedades investigada por RMN multinuclear no estado sólido em materiais desordenados |
| Beneficiário: | Silvia Helena Santagneli |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 15/22828-6 - Ultrapassando as fronteiras de fibras ópticas: da fotônica até optogenética e monitoramento de meio ambiente |
| Beneficiário: | Younes Messaddeq |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa SPEC |
| Processo FAPESP: | 18/06426-3 - Desenvolvimento de coacervatos para manufatura aditiva/impressão 3D de materiais fotônicos |
| Beneficiário: | Gabriel Toshiaki Tayama |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |