Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

Simão, Lisandro; Montedo, Oscar Rubem Klegues; Paula, Marcos Marques da Silva; Silva, Luciano da; Caldato, Rafael Falchi; Innocentini, M. D. M.

doi:10.1590/s1516-14392013005000147

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…The degradation rate of β-wollastonite was also influenced by the crystallinity, sintering period, microstructure, and porosity [ 39 , 40 ]. In this study, the main factor for the increasing degradation rate is the porosity of the material itself.…”

Section: Resultsmentioning

confidence: 99%

Bioactivity and Cell Compatibility of β-Wollastonite Derived from Rice Husk Ash and Limestone

2017

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The aim of this study was to prepare β-wollastonite using a green synthesis method (autoclaving technique) without organic solvents and to study its bioactivity. To prepare β-wollastonite, the precursor ratio of CaO:SiO2 was set at 55:45. This mixture was autoclaved for 8 h and later sintered at 950 °C for 2 h. The chemical composition of the precursors was studied using X-ray fluorescence (XRF), in which rice husk ash consists of 89.5 wt % of SiO2 in a cristobalite phase and calcined limestone contains 97.2 wt % of CaO. The X-ray diffraction (XRD) patterns after sintering showed that only β-wollastonite was detected as the single phase. To study its bioactivity and degradation properties, β-wollastonite samples were immersed in simulated body fluid (SBF) for various periods of time. Throughout the soaking period, the molar ratio of Ca/P obtained was in the range of 1.19 to 2.24, and the phase detected was amorphous calcium phosphate, which was confirmed by scanning electron microscope with energy dispersive X-ray analysis (SEM/EDX) and XRD. Fourier-transform infrared spectroscopy (FTIR) analysis indicated that the peaks of the calcium and phosphate ions increased when an amorphous calcium phosphate layer was formed on the surface of the β-wollastonite sample. A cell viability and proliferation assay test was performed on the rice husk ash, calcined limestone, and β-wollastonite samples by scanning electron microscope. For heavy metal element evaluation, a metal panel that included As, Cd, Pb, and Hg was selected, and both precursor and β-wollastonite fulfilled the requirement of an American Society for Testing and Materials (ASTM F1538-03) standard specification. Apart from that, a degradation test showed that the loss of mass increased incrementally as a function of soaking period. These results showed that the β-wollastonite materials produced from rice husk ash and limestone possessed good bioactivity, offering potential for biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Bioactivity and Cell Compatibility of β-Wollastonite Derived from Rice Husk Ash and Limestone

2017

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“…The Darcy permeability k 1 and inertial permeability k 2 in this work and those obtained from recent literature on porous ceramics, such as porous SiC ceramics, 41,42 porous Si 3 N 4 ceramics, 11,43,44 porous SiC–Si 3 N 4 ceramics 45 and other porous ceramics, 46–48 are shown in Figure 13. It is worth mentioning that the porous Si 3 N 4 prepared this work has a k 1 ranging from 1.59 × 10 −15 to 1.91 × 10 −14 m 2 , falling in the microfiltration zone of the k 1 range of 1 × 10 −17 to 1 × 10 −13 m 2 , which indicates that the samples prepared in this work are suitable for microfiltration applications.…”

Section: Resultsmentioning

confidence: 59%

Mechanical property and gas filtration behavior of porous reaction bonded Si₃N₄ with monodispersed PMMA as pore former

Zhao

Cao

et al. 2022

Int J Applied Ceramic Tech

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Porous Si 3 N 4 ceramics were prepared by gel casting combined with a reaction bonding route using monodispersed PMMA as the pore former, and Isobam was used as a gel agent. With the PMMA addition varying from 0 to 20 wt.%, the bending strength was degraded from 94.0 to 39.1 MPa owing to the increased porosity and decreased bulk density. The β-Si 3 N 4 prismatic grains and round pores introduced by the monodispersed PMMA micro balls would endow the samples with high strength, and the permeability of the resulting samples was increased obviously with the increase of PMMA addition. Flue gas filtration test exhibited that the filtration efficiency of the porous ceramics filter was not degraded with introducing of the PMMA pore former, even though the permeability was increased obviously. The block type of the sample with 20-wt.% PMMA additions during filtration was cake filtration, which indicates that the sample has the characteristic of being reusable after back-blowing in flue gas filtration applications. Porous Si 3 N 4 with high strength and permeability fabricated via the reaction bonding route exhibits great potential for low-cost high-performance ceramics filters.

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“…For the theoretical high surface area, excellent permeability, good chemical and thermal stability, low electrical and thermal conductivity 1–5 , porous ceramics are widely used in chemical, energy, metallurgy, bio-medicine, environmental protection, aerospace and other fields 6–10 , as filter materials, catalyst supports, insulation materials, bio-functional materials and so on. Generally a porous material is needed.…”

Section: Introductionmentioning

confidence: 99%

The Preparation and Properties of Porous Sepiolite Ceramics

Wang

et al. 2019

Sci Rep

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In this paper, a new type of porous ceramics was prepared using the raw sepiolite mineral. The porous ceramics was shaped by the dry pressing method and sintered in the range of 700 ~ 1200 °C. The temperature-microstructure evolution and the properties of porous sepiolite ceramics were investigated by thermo gravimetric and differential thermal analyses (TG-DTA), X-ray diffraction (XRD), bending strength, compressive strength, scanning electron microscopy (SEM) and mercury intrusion porosimeter (MIP). The sintering kinetics of the porous ceramics from sepiolite was investigated by means of stepwise isothermal dilatometry (SID). The mechanical properties improved with the increasing sintering temperature, and the bending strength and compression strength reached a maximum of 52 MPa and 32 MPa respectively at 1200 °C. The porosity increased with the sintering temperature until 1100 °C attaining the value of 55.40% and then decreased to a value of 46.48% at 1200 °C. The main crystal phases of the porous ceramics were akermanite and diopside. At 1200 °C, the pores inside the ceramics basically follows a unimodal distribution, which was mainly located near 553 nm. The sintering activation energy of porous sepiolite ceramics was measured by step isothermal thermal expansion with a value of 791.42 kJ/mol in the range of 1000 °C to 1200 °C.

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Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

Cited by 9 publications

References 30 publications

Bioactivity and Cell Compatibility of β-Wollastonite Derived from Rice Husk Ash and Limestone

Bioactivity and Cell Compatibility of β-Wollastonite Derived from Rice Husk Ash and Limestone

Mechanical property and gas filtration behavior of porous reaction bonded Si₃N₄ with monodispersed PMMA as pore former

The Preparation and Properties of Porous Sepiolite Ceramics

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Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

Cited by 9 publications

References 30 publications

Bioactivity and Cell Compatibility of β-Wollastonite Derived from Rice Husk Ash and Limestone

Bioactivity and Cell Compatibility of β-Wollastonite Derived from Rice Husk Ash and Limestone

Mechanical property and gas filtration behavior of porous reaction bonded Si3N4 with monodispersed PMMA as pore former

The Preparation and Properties of Porous Sepiolite Ceramics

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Mechanical property and gas filtration behavior of porous reaction bonded Si₃N₄ with monodispersed PMMA as pore former