Highly porous bioactive glass-ceramic scaffolds were effectively fabricated by an inorganic gel casting technique, based on alkali activation and gelification, followed by viscous flow sintering. Glass powders, already known to yield a bioactive sintered glass-ceramic (CEL2) were dispersed in an alkaline solution, with partial dissolution of glass powders. The obtained glass suspensions underwent progressive hardening, by curing at low temperature (40 °C), owing to the formation of a C–S–H (calcium silicate hydrate) gel. As successful direct foaming was achieved by vigorous mechanical stirring of gelified suspensions, comprising also a surfactant. The developed cellular structures were later heat-treated at 900–1000 C, to form CEL2 glass-ceramic foams, featuring an abundant total porosity (from 60% to 80%) and well-interconnected macro- and micro-sized cells. The developed foams possessed a compressive strength from 2.5 to 5 MPa, which is in the range of human trabecular bone strength. Therefore, CEL2 glass-ceramics can be proposed for bone substitutions.
Bioactive glass-ceramic foam scaffolds from "inorganic gel casting" and sinter-crystallization / Elsayed, Hamada; rincon romero, Acacio; Molino, Giulia; VITALE BROVARONE, Chiara; Bernardo, Enrico. - In: MATERIALS. - ISSN 1996-1944. - ELETTRONICO. - 11:349(2018). [10.3390/ma11030349]
|Titolo:||Bioactive glass-ceramic foam scaffolds from "inorganic gel casting" and sinter-crystallization|
|Data di pubblicazione:||2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3390/ma11030349|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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