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oai:riubu.ubu.es:10259/57342024-07-25T07:24:30Zcom_10259_9476com_10259.4_106com_10259_2604col_10259_9477

Montinaro, Selena Desogus, Luca Orrù, Roberto Garroni, Sebastiano Delogu, Francesco Ricci, Pier Carlo Cao, Giacomo 2021-04-27T08:52:46Z 2021-04-27T08:52:46Z 2018-01 0002-7820 http://hdl.handle.net/10259/5734 10.1111/jace.15199 The interaction of fully dense 45S5‐bioglass derived samples produced by Spark Plasma Sintering (SPS) with simulated body fluid (SBF) solution was investigated in detail taking advantage of the Rietveld refinement method to quantitatively evidence the corresponding microstructural and compositional changes. It is observed that, when the original amorphous nature is mostly (75 wt%) preserved in the material during sintering (550°C, 2 minutes), the resulting specimens dissolve faster and determine relatively higher pH increase and ions release in the SBF solution. Correspondingly, a relatively lower amount of hydroxycarbonate apatite (HCA) is formed on their surface. In contrast, a more extensive apatite layer with trabecular structure is generated within 3 days storage on the surface of fully crystallized samples obtained at 600°C by SPS, which only consists of Na–Ca silicate grains (20 nm). Moreover, as the sintering temperature and dwell time were increased to 700°C and 20 minutes, respectively, a rhenanite‐like phase was also formed (about 15 wt%), other than crystallites growth to 90 nm. Interestingly, the presence of rhenanite provides a beneficial contribution for the production of the HCA layer, which was found the largest for this system when considering storage periods of 7 and 14 days, respectively. Regione Autonoma della Sardegna (Italy). Grant Number: CUP n. F71J11001070002 application/pdf eng Wiley Journal of the American Ceramic Society. 2018, V. 101, n. 1, p. 116-130 https://doi.org/10.1111/jace.15199 info:eu-repo/grantAgreement/Regione Autonoma della Sardegna/F71J11001070002 bioactive glasses in vitro test Rietveld method spark plasma sintering Materiales Ensayos (Tecnología) Materials Testing A comprehensive study on compositional and structural changes in 45S5 bioglass products exposed to simulated body fluid info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion info:eu-repo/semantics/openAccess Journal of the American Ceramic Society 101 1 116 130