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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Correlating the Morphological Properties and Structural Organization of Monodisperse Spherical Silica Nanoparticles Grown on a Commercial Silica Surface

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Autor(es):
Moreno, Yolice P. [1] ; Cardoso, Mateus B. [2] ; Moncada, Edwin A. [3] ; dos Santos, Joao H. Z. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Fed Rio Grande do Sul, Dept Engn Quim, BR-90040040 Porto Alegre, RS - Brazil
[2] LNLS, BR-13083970 Campinas, SP - Brazil
[3] Inst Tecnol Metropolitano, Medellin - Colombia
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: ChemPhysChem; v. 16, n. 14, p. 2981-2994, OCT 5 2015.
Citações Web of Science: 5
Resumo

A variety of nanosilicas have been widely used to fabricate rough surfaces with superhydrophobic and superhydrophilic properties. In this context, we prepared mixed silica and mixed nanosilica that were generated by the growth and self-assembly of synthesized monodisperse silica nanospheres (11-30 nm, 363 m(2)g(-1)) on the surface of Sylopol-948 and Dispercoll S3030 by using a base-catalyzed sol-gel route. Using this process, the interactions and hierarchical structure between the nano-and microsized synthesized silica particles were studied by changing the amount of tetraethoxysilane. The resulting materials were characterized by BET analysis, small-angle X-ray scattering (SAXS), dynamic light scattering, FTIR spectroscopy, and SEM. The mixed silica presented a higher specific surface area (326 m(2)g(-1)), a six-fold higher percentage of (SiO)(6) (44-68 %), and a higher amount of silanol groups (14.0-30.7 %) than Sylopol-948 (271 m(2)g(-1), 42.6%, and 12.5%, respectively). The morphological and hierarchical structural differences in the silica nanoparticles synthesized on the surface of commercial silica (micrometric or nanometric) were identified by SAXS. Mixed micrometric silica exhibited a higher degree of structural organization between particles than mixed nanosilica. (AU)

Processo FAPESP: 11/21954-7 - Funcionalização de nanopartículas compósitas para aplicações biomédicas
Beneficiário:Mateus Borba Cardoso
Modalidade de apoio: Auxílio à Pesquisa - Regular