Influence on the gamma-ray irradiation in textural properties of mesoporous silica

Reference	Presenter	Authors (Institution)	Abstract
17-082	Ivana Conte Cosentino	Geraldo, A.B.(Instituto de Pesquisas Energéticas e Nucleares); Machado, L.D.(Instituto de Pesquisas Energéticas e Nucleares); Matos, J.d.(Instituto de Química da USP); Virginio, S.d.(Centro Tecnologico da Marinha); Genova, L.A.(Instituto de Pesquisas Energéticas e Nucleares); Cosentino, I.C.(Instituto de Pesquisas Energéticas e Nucleares);	Mesoporous silica nanoparticles have high surface area, large pore volume, uniform porosity, high adsoption capacity and high chemical, mechanical and thermal stability. This makes them extremely attractive as drug carriers, diagnostic catalysis, chromatographic separation, selective sorption of organic molecules and sensing. The aim of this work is to compare the characteristics of mesoporous silica nanoparticles prepared by sol-gel by changing the hydrothermal treatment step for a gamma irradiation step. 60Co gamma-ray irradiation was carried out in a GammaCell at IPEN, the dose rate was 50 KGy. Characterization of the calcined material was done by transmission electron microscopy (TEM), nitrogen adsorption/desorption isotherms, X-ray diffraction (XRD) and differential thermal analysis (DTA). The results showed that the replacement of the hydrothermal step, which consumes longer processing time, by the faster irradiation step did not compromise the main characteristics of the silica: surface area changed from 742 m2/g to 586 m2/g and pore volumes from 0,57 cm3/g to 0,46 cm3/g. The results obtained so far indicate that the use of the irradiation step has proved to be an interesting option for the synthesis of mesoporous silica.
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