Silicone resins mixed with active oxide fillers and Ca–Mg Silicate glass as alternative/integrative precursors for wollastonite–diopside glass-ceramic foams

Fiocco, Laura; Elsayed, Hamada; Daguano, J.K.M.F.; Soares, Viviane Oliveira; Bernardo, Enrico

doi:10.1016/j.jnoncrysol.2015.03.001

Cited by 37 publications

(32 citation statements)

References 20 publications

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“…The heat treatment of silicones and fillers was therefore confirmed as an effective method for the direct synthesis of glass‐ceramics, as shown by previous investigations . The highly reactive silica from the silicone thermo‐oxidative decomposition reacted with most of the components, leading to the characteristic silicate phase, whereas P 2 O 5 (from sodium phosphate) led to a liquid phase that transformed into glass upon cooling.…”

Section: Resultssupporting

confidence: 60%

“…Silica, resulting from the thermo‐oxidative decomposition of silicones, easily reacts with the oxides provided by the fillers (consisting of carbonates, hydroxides or oxides). Several bioactive crystalline Ca‐based silicate ceramics, according to this process, have been produced and belong to the vast range of “polymer‐derived ceramics” (PDC), known for their distinctive shaping possibilities, through direct foaming, extrusion, and additive manufacturing, available before heat treatment (in the polymer state) …”

Section: Introductionmentioning

confidence: 99%

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Biosilicate^® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers

et al. 2018

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Monolithic and powdered Biosilicate®, produced by conventional glass‐ceramic technology, have been widely recognized as excellent materials for bone tissue engineering applications. In the current research, we focus on an alternative processing route for this material, consisting of the thermal treatment of silicone polymers containing micro‐sized oxide fillers, which offers a unique integration between materials synthesis and shaping. In particular, the new method allows obtaining highly porous Biosilicate® glass‐ceramics, in the form of 3D printed scaffolds and foams. 3D scaffolds were successfully fabricated by direct writing using an ink based on a silicone polymer and active inorganic fillers, followed by firing in air at 1000°C. The products showed regular geometries, large open porosity (~60 vol%) and still high compressive strength (~7 MPa). Open‐cellular foams with porosity up to ∼80 vol% were also prepared from liquid silicones mixed with several fillers, including hydrated sodium phosphate. This specific filler acted both as a foaming agent, because of the gas release by dehydration occurring at low temperature, and as a provider of liquid phase upon firing in air, again at 1000°C.

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Biosilicate^® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers

et al. 2018

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“…1 confirm absorption band observed at 2784 cm -1 is due to the C-H stretching of aromatic olefins (Fiocco et al 2015). A strong, broad absorbance band observed at 3500 cm -1 , due to O-H stretching vibrations.…”

Section: Ftir Analysismentioning

confidence: 81%

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

et al. 2016

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Sorption of calcium ion from the hard underground water using novel oxidized graphene (GO) sheets was studied in this paper. Physicochemical properties and microstructure of graphene sheets were investigated using Raman spectrometer, thermogravimetry analyzer, transmission electron microscope, scanning electron microscope. The kinetics adsorption of calcium on graphene oxide sheets was examined using Lagergren first and second orders. The results show that the Lagergren secondorder was the best-fit model that suggests the conception process of calcium ion adsorption on the Go sheets. For isothermal studies, the Langmuir and Freundlich isotherm models were used at temperatures ranging between 283 and 313 K. Thermodynamic parameters resolved at 283, 298 and 313 K indicating that the GO adsorption was exothermic spontaneous process. Finally, the graphene sheets show high partiality toward calcium particles and it will be useful in softening and treatment of hard water.

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“…As described in a couple of previous papers, the problem may be solved by providing a liquid phase upon firing, which could promote the ionic interdiffusion, operating with specific fillers [16]. A fundamental example is that of hydrated sodium borate, also known as borax (Na 2 B 4 O 7 ·10H 2 O) included in the formulations for akermanite (Ca 2 MgSi 2 O 7 ) [12] and wollastonite-diopside ceramics [15]. The additive formed a borate liquid phase upon firing and helped the crystallization of the desired phases.…”

Section: Introductionmentioning

confidence: 99%

Bioactive Wollastonite-Diopside Foams from Preceramic Polymers and Reactive Oxide Fillers

et al. 2015

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Wollastonite (CaSiO3) and diopside (CaMgSi2O6) silicate ceramics have been widely investigated as highly bioactive materials, suitable for bone tissue engineering applications. In the present paper, highly porous glass-ceramic foams, with both wollastonite and diopside as crystal phases, were developed from the thermal treatment of silicone polymers filled with CaO and MgO precursors, in the form of micro-sized particles. The foaming was due to water release, at low temperature, in the polymeric matrix before ceramic conversion, mainly operated by hydrated sodium phosphate, used as a secondary filler. This additive proved to be “multifunctional”, since it additionally favored the phase development, by the formation of a liquid phase upon firing, in turn promoting the ionic interdiffusion. The liquid phase was promoted also by the incorporation of powders of a glass crystallizing itself in wollastonite and diopside, with significant improvements in both structural integrity and crushing strength. The biological characterization of polymer-derived wollastonite-diopside foams, to assess the bioactivity of the samples, was performed by means of a cell culture test. The MTT assay and LDH activity tests gave positive results in terms of cell viability.

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Silicone resins mixed with active oxide fillers and Ca–Mg Silicate glass as alternative/integrative precursors for wollastonite–diopside glass-ceramic foams

Cited by 37 publications

References 20 publications

Biosilicate^® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers

Biosilicate^® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

Bioactive Wollastonite-Diopside Foams from Preceramic Polymers and Reactive Oxide Fillers

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Silicone resins mixed with active oxide fillers and Ca–Mg Silicate glass as alternative/integrative precursors for wollastonite–diopside glass-ceramic foams

Cited by 37 publications

References 20 publications

Biosilicate® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers

Biosilicate® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

Bioactive Wollastonite-Diopside Foams from Preceramic Polymers and Reactive Oxide Fillers

Contact Info

Product

Resources

About

Biosilicate^® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers

Biosilicate^® scaffolds produced by 3D‐printing and direct foaming using preceramic polymers