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... freeze casting method was used to produce porous merwinite scaffold. The compressive strength of the porous merwinite scaffold was tested and the result has been shown in Fig. 1 According to the XRD pattern ( Fig. 2) of sintered samples, the only phase was related to merwinite (JCPDS 25-0161). No processing residue or secondary phases were found in the materials. Fig. 4(a) shows the morphology of the sintered porous merwinite scaffold. The nano-structured merwinite scaffolds possessed unidirectional aligned ...
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... The class of calcium silicates also includes the ceramic components of the ternary system CaO-SiO 2 -MgO [11][12][13], such as diopside (CaMgSi 2 O 6 ), akermanite (Ca 2 MgSi 2 O 7 ) and merwinite (Ca 3 MgSi 2 O 8 ). Their multifunctional properties recommend them as candidates for the development of materials suitable for the treatment of bone tissue injuries, as well as its regeneration [12][13][14][15][16][17]; this is due to Ca and Mg ions [1,18] that promote the process of mineralization through apatite deposition [3,19] and enhance cell proliferation and differentiation [1,20,21]. Some researchers prepared larnite and rankinite through the sol-gel combustion method [22], but also monticellite and diopside from eggshell waste via the combustion route [23], with good results in terms of mechanical strength, bioactivity, antibacterial activity, as well as cell adhesion, proliferation and differentiation. ...
In this work, calcium magnesium silicate ceramics were processed through the sol–gel method in order to study the crystalline and morphological properties of the resulting materials in correlation with the compositional and thermal parameters. Tetraethyl orthosilicate and calcium/magnesium nitrates were employed as sources of cations, in ratios specific to diopside, akermanite and merwinite; they were further subjected to gelation, calcination (600 °C) and thermal treatments at different temperatures (800, 1000 and 1300 °C). The properties of the intermediate and final materials were investigated by thermal analysis, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction and Rietveld refinement. Such ceramics represent suitable candidates for tissue engineering applications that require porosity and bioactivity.
