resumo
Synthesis of sol-gel glass with incorporation of Na2O is extremely difficult, as such glasses have a great tendency to crystallize. Slow drying and aging over several days or weeks is usually required in sol-gel preparation procedures. This work reports a fast, novel route for the synthesis of bioglass powders in a considerably shortened period of 1 h. A comparative study of sol-gel derived glasses made by this novel route using rotary evaporator drying, and a conventional route using oven drying and aging, revealed that the two methods produce stabilized (devitrified) bio-glasses with virtually identical behavior and properties. Indeed, the rapidly dried powder exhibited slightly enhanced properties that should result in improved bioactivity. Fourier-transform infrared spectroscopy was used to understand the structures of the synthesized powders, and MAS-NMR was used to look at the degree of polymerization. This innovative, rapid route was successfully demonstrated to produce glass and devitrified glass nanopowders more than one hundred times quicker than the quickest reported standard drying methods.
palavras-chave
IN-VITRO BIOACTIVITY; SILICA-BASED GLASSES; CERAMICS; SIO2-CAO-P2O5; SPECTROSCOPY; TEMPERATURE; REACTIVITY; TEMPLATE; FTIR
categoria
Materials Science
autores
Ben-Arfa, BAE; Salvado, IMM; Ferreira, JMF; Pullar, RC
nossos autores
Basam Abobaker Emhmed Ben-Arfa
Investigador
Isabel Margarida Miranda Salvado
Professor associado
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)
Rob Pullar
ColaboradorGrupos
G4 - Materiais Renováveis e Economia Circular
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
FCT, Grant/Award Number: SFRH/BPD/97115/ 2013, UID /CTM /50011/2013; FEDER