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Synthetic magnesium silicate : ウィキペディア英語版 | Synthetic magnesium silicate Synthetic magnesium silicates are white, odorless, finely divided powders formed by the precipitation reaction of water-soluble sodium silicate (water glass) and a water-soluble magnesium salt such as magnesium chloride, magnesium nitrate or magnesium sulfate. The composition of the precipitate depends on the ratio of the components in the reaction medium, the addition of the correcting substances, and the way in which they are precipitated.〔Ralph K. Iler, The Chemistry of Silica: Solubility, Polymerization, Colloid, and Surface Properties, and Biochemistry, John Wiley and Sons (1979)〕〔Krysztafkiewics, A., Lipska, L.K., Ciesielczyk, F., and Jesionowski, T. Amorphous magnesium silicate – synthesis, physicochemical properties and surface morphology. Advanced Powder Technol, 15, 549, 2004.〕〔Ciesielczyk, F., Krysztafkiewics, A., Jesionowski, T. Physicochemical studies on precipitated magnesium silicates. J Mater Sci. 42, 3831, 2007.〕 The molecular formula is typically written as MgO:XSiO2, where X denotes the average mole ratio of SiO2 to MgO. The product is hydrated and the formula is sometimes written MgO:XSiO2•H2O to show the water of hydration. ==Properties== Unlike natural magnesium silicates like talc and forsterite olivine which are crystalline, synthetic magnesium silicates are amorphous.〔 Synthetic magnesium silicates are insoluble in water or alcohol.〔Condensed Chemical Dictionary, Eleventh Edition, Van Nostrand and Reinhold Co. Inc., New York, NY (1987)〕 The particles are usually porous, and the BET surface area can range from less than 100 m2/g to several hundred m2/g.
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