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Influence of Na_(2)SiO_(3)/NaOH Ratio on Calcined magnesium silicate Based Geopolymer——Experimental and Predictive Study

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1077-1085页

作者： Premkumar R Ramesh Babu Chokkalingam Meyyappan PL Shanmugasundaram M Kalasalingam Academy of Research and Education Krishnan KoilTamil Nadu626126 India Vellore Institute of Technology-Chennai Tamilnadu600127 India

This study aims to investigate the behavior of alkali activated mortar,which is made of naturally available magnesium silicate as source material.For magnesium silicate,ultrafine natural steatite powder(UFNSP)is used as the primary source of binder,and the activation is initiated through the alkali liquid which is proportioned in various combinations of silicate to hydroxide ratio(Na_(2)SiO_(3)/Na OH)ratio,and this ratio in this study varies from 1 to 3.The UFNSP is calcined at two difierent temperatures,700 and 1000℃.The mortar mix is proportioned as 1:3 between powder and the fine aggregate,and the mortar is prepared with hydroxide molarity(M)of 10 M.The mortar is cured for 48 hours at 60℃and the compressive strength was studied.All the mix were studied for its microstructural behavior along with compressive strength.The mix proportion of the mortar,and the results obtained through microstructural characterization were combinedly formed as input for artificial neural network(ANN)predictive modelling.The model is designed to predict the compressive strength,which is trained through Bayesian regularization algorithm with varying hidden neurons of 7 to 10.This experimental and predictive study shows that the strength is influenced by both Na_(2)SiO_(3)/Na OH ratio and calcination process.And the ANN is influenced by mainly calcination temperature and uncorrelation occurs in selected samples of 1000℃calcined UFNSP mix.

关键词： magnesium silicate silicate alkali activation geopolymer UFNSP prediction

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Adsorption of Methylene Blue on magnesium silicate: Kinetics, equilibria and comparison with other adsorbents

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Journal of Environmental Sciences 2010年第3期22卷 467-473页

作者： Franco Ferrero Department of Materials Science and Chemical Engineering Polytechnic of Torino Corso Duca degli Abruzzi 24 I10129 Torino Italy

Batch adsorption from aqueous solutions in a slightly basic medium of Methylene Blue, up to 2500 mg/L, onto synthetic magnesium silicate （Florisil） of three particle size ranges （mean diameters of 112, 200 and 425 μm） was compared to the corresponding adsorption onto activated carbon and Amberlite XAD-2. The best fit of the kinetic results was achieved by a pseudo second-order equation. The equilibrium data were found to be well represented by the Langmuir isotherm equation. Amberlite XAD-2, an unspecific adsorbent capable of adsorbing exclusively through a surface effect, exhibited a poor dye uptake, confirming that the adsorption mechanism on Florisil was due to electrostatic attraction and ion exchange. Moreover, the comparison between Florisil and the other adsorbents was performed on the basis of the evaluation of the surface area and pore volume occupied by the adsorbed dye.

关键词： dye adsorption magnesium silicate Florisil adsorption kinetics adsorption isotherms

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Antibacterial forsterite (Mg_(2)SiO_(4)) scaffold: A promising bioceramic for load bearing applications

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Bioactive Materials 2018年第3期3卷 218-224页

作者： Rajan Choudhary Ankita Chatterjee Senthil Kumar Venkatraman Sivasankar Koppala Jayanthi Abraham Sasikumar Swamiappan Department of Chemistry School of Advanced SciencesVIT UniversityVellore632014Tamil NaduIndia Microbial Biotechnology Laboratory School of Biosciences and TechnologyVIT UniversityVellore632014Tamil NaduIndia Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093Yunnan ProvincePR China

In the current work,forsterite samples with different surface area were investigated for its antibacterial activity.Dissolution studies show that the lower degradation of forsterite compared to other silicate bioceramics,which is a desirable property for repairing bone defects.Forsterite scaffold shows superior compressive strength than the cortical bone after immersion in simulated body fluid.Bactericidal tests indicate that the forsterite had inhibition effect on the growth of clinical bacterial isolates.Forsterite may be a suitable candidate material for load bearing applications with enhanced mechanical properties and lower degradation rate.

关键词： magnesium silicate Bone Antibacterial Dissolution Mechanical stability

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