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| - A New Nonsurfactant Pathway to Mesoporous SilicaMaterials Based on Tartaric Acid in Conjunction withMetallic Chloride
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| - Mesoporous silica materials have been prepared via the sol−gel reactions of tetraethylorthosilicate through a new nonsurfactant pathway based on organic compound tartaric acidin conjunction with metallic chloride such as magnesium chloride or aluminum chloride astemplates or pore-forming agents. The mesoporous silica materials were obtained upon theremoval of the pore-forming agents by extraction with ethanol from the sol−gel composites.The effect of the metallic chloride amount in the synthesis on the physicochemical propertiesof the porous silica materials is investigated. The results from nitrogen sorption isotherms,transmission electron microscopy, and powder X-ray diffraction indicate that the pore volumesand pore diameters of the extracted samples generally rise with the increase of the amountof the metallic chloride. The results also show that magnesium chloride and aluminumchloride are more effective than sodium chloride in the pore-forming for the preparation ofmesoporous materials. The analyses from X-ray fluorescence and infrared spectrometryindicate that the magnesium and aluminum atoms coordinate with the carboxylate anionsof tartaric acid and consequently the coordination complexes act as the pore-forming agents.
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