A new route to sol-gel crystalline wollastonite bioceramic

Abstract

Artificial bone graft materials formed from wollastonite have been extensively used in bone repair because of their high degree of bioactivity and biocompatibility, thereby justifying the development of a protocol for large-scale production. This work reports a novel route for preparing wollastonite via the sol-gel process using bentonite clay as a cheap silica source. The obtained wollastonite was characterized for morphology, elemental composition, phase composition and bioactivity using scanning electron microscopy, energy dispersive X-ray analysis, X-ray diffraction and Fourier transform infrared spectroscopy. Results obtained revealed that wollastonite phase was successfully formed in the material and it showed ability to induce formation of apatite within 0.5 day in biological fluid, an indicator for bone-bonding capability. Overall, the wollastonite prepared from the bentonite clay exhibited properties comparable to that synthesized from commercially obtained sodium metasilicate. Hence, our synthetic route may be useful for commercial-scale preparation of wollastonite.

Preliminary Synthesis of Calcium Silicates using Oil Palm Leaves and Eggshells.

“…Other peaks at 26.8°, 29.92°, 39.3°, 44.7°, and various small peaks were also observed, more clearly in Figure 3(b), indicating the presence of reasonable amounts of CaSiO3. This was compared to previous XRD results on calcium silicates synthesized using pure silica and pure CaO precursors [29], and referred to JCPDS #00-043-1460 [30,23]. It was found that higher amounts of CaSiO3 were obtained in the present study, most likely due to the fact that our method preserves the high content of silica precursor in OPL.…”

Metal doped calcium silicate biomaterial for skin tissue regeneration in vitro

“…Also the peaks attributing O-H group is expected due to the presence of moisture. 18,25 The crystalline phases in Figure 1(c) has shown phases corresponding to Wollastonite groups (Wollastonite triclinic and monoclinic phases) and hydroxyapatite group as per FT-IR spectra. 26 The hydrodynamic diameter of Ws and Zn-Ws was found at 620 nm and 730 nm respectively (Figure 2(a)).…”

Robocasting of controlled porous CaSiO3–SiO2 structures: Architecture – Strength relationship and material catalytic behavior

“…Most recently, wollastonite has become suitable for reinforcing composites [7,8] and as a bone substitute in orthopedic applications owing to its bioactive properties [9,10]. Different methods are currently known for the production of synthetic wollastonite from various sources of calcium and silicon, e.g., synthesis via solidstate reaction [11,12], sol-gel method [13,14], hydrothermal synthesis [15], chemical precipitation [16,17], among others. Most of the wollastonite applications involve the use of bulk bodies or free-particles that exhibit as large specific surface area as possible without detriment of the mechanical stability.…”