Polymer-derived SiOC aerogel with hierarchical porosity through HF etching |
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| Affiliation: | 1. Dipartimento di Ingegneria Industriale, Università di Trento, Via Sommarive 9, 38123 Trento, Italy;2. Department of Mechanical Engineering, Istanbul Kemerburgaz University, 34217 Istanbul, Turkey;1. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovskeho namesti 2, CZ-16200 Praha, Czech Republic;2. Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, v.v.i., V Holesovickach 41, CZ-182 09 Praha, Czech Republic;3. Institute of Physics of Materials of the Academy of Sciences of the Czech Republic, v.v.i., Zizkova 22, CZ-61662 Brno, Czech Republic;4. Charles University in Prague, Faculty of Science, Hlavova 2030, CZ-12843 Prague, Czech Republic;1. Technical University Darmstadt, Jovanka-Bontschits-Straße 2, 64287, Darmstadt Germany;2. University of Trento, Via Sommarive 9, 38123, Trento, Italy;1. INM - Leibniz Institute for New Materials, 66123 Saarbrücken, Germany;2. Department of Materials Science and Engineering, Saarland University, 66123 Saarbrücken, Germany;3. Department of Mechanical Engineering, Istanbul Kemerburgaz University, 34217 Istanbul, Turkey;1. Dipartimento di Ingegneria Industriale, Università di Trento, Via Sommarive 9, 38123 Trento, Italy;2. Department of Inorganic Chemistry, Dresden University of Technology, Bergstraße 66, D-01062 Dresden, Germany;1. College of Urban Construction, Nanjing Tech University, Nanjing 210009, China;2. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China;4. Beijing Institute of Aeronautic Materials, Beijing 100095, China |
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| Abstract: | Silicon oxycarbide (SiOC) aerogels have been synthesized from preceramic polymers via pyrolysis in inert atmosphere at 1200 and 1300 °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 °C, leading to a maximum value of specific surface area of 530 m2/g and total porosity of 0.649 cc/g. |
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| Keywords: | Preceramic polymers SiOC High surface area Aerogels HF etching |
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