Estudio de los cambios de la composición química de un ionómero vítreo mediante la técnica de PIXE

VERÓN, MARÍA GISELA; SUÁREZ, SERGIO GABRIEL; PRADO, MIGUEL OSCAR

REVISTA MATéRIA

UNIV FED RIO DE JANEIRO

Lugar: Rio de Janeiro; Año: 2018 vol. 23

1517-7076

In the present work, the effect of commonly consumed beverages such as coffee, mate, tea and mineral water on the surface chemical composition of a commercial glass ionomer is studied. Ionomer samples were pre-pared according to the manufacturer; they were placed within infusions and stationed on culture stove at 36 °C in the range of 21 hours to 33 days. The evolution of the chemical composition at different storage times was studied by Proton Induced X-Ray Emission (PIXE) technique. In all media except mineral water, to long times, the loss of Al, Si and Na was determined, suggesting the partial dissolution of Na aluminumsilicate. The concentration profile of Al and Si were different in every way, but the ratio Al: Si remained close to unity in all cases. The F was released associated with Na in mineral water, while in the rest of the beverages its concentration profile infers the formation of fluorinated compounds of Ca and La. Simultaneously, the ad-sorption of Mn, Mg and Fe to the glass ionomer surface was observed, not previously reported in the literature.