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    Polymer-derived SiOC aerogel with hierarchical porosity through HF etching
    (Elsevier Sci Ltd, 2016) Assefa, Dawit; Zera, Emanuele; Campostrini, Renzo; Soraru, Gian Domenico; Vakıfahmetoglu, Cekdar
    Silicon oxycarbide (SiOC) aerogels have been synthesized from preceramic polymers via pyrolysis in inert atmosphere at 1200 and 1300 degrees C. The as synthesized materials have a typical colloidal microstructure with mesoporosity in the range 10-50 nm and no microporosity. HF acid attack of the SiOC aerogels dissolves preferentially the SiO2-rich phase and creates micro-and (small)mesopores (<10 nm) in the aerogels microstructure finally leading to a materials with hierarchical porosity. The HF post-pyrolysis treatment is more efficient for the SiOC aerogels pyrolyzed at the maximum temperature, i.e. 1300 degrees C, leading to a maximum value of specific surface area of 530 m(2)/g and total porosity of 0.649 cc/g. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.