The use of microwave processing for the synthesis of solids offers many new opportunities in the field of materials chemistry, including significant reductions in manufacturing costs due to energy savings, shorter processing times, improved product uniformity, unique microstructures and properties (1). Among the synthesis methods suited for the development of materials, the sol-gel route has gained great interest during the last years for making advanced materials and in particular to prepare oxide-based systems (2). Microwave processing can be conveniently coupled with the sol-gel method especially for the preparation of bulk materials. In this work, the microwave-assisted sol-gel synthesis of bulk silica-based materials is presented. The effect of different heating methods (conventional, hybrid microwave, pure microwave) on the chemical composition and on the morphology of the samples was investigated and discussed. The composition was studied by X-ray Photoelectron Spectroscopy (XPS), UVVis, FT-IR, Differential Thermal Analysis (DTA), ThermoGravimetry- Mass Spectrometery (TG-MS), the microstructure through X-Ray Diffraction (XRD), whereas the surface area and porosity were determined by N2 absorption measurements (BET method). Improvement of materials properties in terms of composition was pointed out in the case of microwave treated samples.
Effects of microwave heating on silica-based materials obtained via sol-gel processing
L. ARMELAO;GROSS, SILVIA;
2001
Abstract
The use of microwave processing for the synthesis of solids offers many new opportunities in the field of materials chemistry, including significant reductions in manufacturing costs due to energy savings, shorter processing times, improved product uniformity, unique microstructures and properties (1). Among the synthesis methods suited for the development of materials, the sol-gel route has gained great interest during the last years for making advanced materials and in particular to prepare oxide-based systems (2). Microwave processing can be conveniently coupled with the sol-gel method especially for the preparation of bulk materials. In this work, the microwave-assisted sol-gel synthesis of bulk silica-based materials is presented. The effect of different heating methods (conventional, hybrid microwave, pure microwave) on the chemical composition and on the morphology of the samples was investigated and discussed. The composition was studied by X-ray Photoelectron Spectroscopy (XPS), UVVis, FT-IR, Differential Thermal Analysis (DTA), ThermoGravimetry- Mass Spectrometery (TG-MS), the microstructure through X-Ray Diffraction (XRD), whereas the surface area and porosity were determined by N2 absorption measurements (BET method). Improvement of materials properties in terms of composition was pointed out in the case of microwave treated samples.Pubblicazioni consigliate
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