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with the CO2 supercritical drying technique using nano alumina powder and tetraethoxysilane(TEOS)as the precursors.The structure and morphology of the obtained alumina-silica composite aerogels were characterized by field emission scanning electron microscopy(FESEM),XRD.The results of FESEM show that the composite aerogels possessed a network microstructure and were highly porous materials.