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 microand (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.

Polymer-derived SiOC aerogel with hierarchical porosity through HF etching / Assefa, Dawit; Zera, Emanuele; Campostrini, Renzo; Sorarù, Gian Domenico; Vakifahmetoglu, Cekdar. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - STAMPA. - 42:10(2016), pp. 11805-11809. [10.1016/j.ceramint.2016.04.101]

Polymer-derived SiOC aerogel with hierarchical porosity through HF etching

Zera, Emanuele;Campostrini, Renzo;Sorarù, Gian Domenico;
2016-01-01

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 microand (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.
2016
10
Assefa, Dawit; Zera, Emanuele; Campostrini, Renzo; Sorarù, Gian Domenico; Vakifahmetoglu, Cekdar
Polymer-derived SiOC aerogel with hierarchical porosity through HF etching / Assefa, Dawit; Zera, Emanuele; Campostrini, Renzo; Sorarù, Gian Domenico; Vakifahmetoglu, Cekdar. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - STAMPA. - 42:10(2016), pp. 11805-11809. [10.1016/j.ceramint.2016.04.101]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/174251
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