Polymer-derived SiOC aerogel with hierarchical porosity through HF etching
Yükleniyor...
Dosyalar
Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Sci Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
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.
Açıklama
Vakifahmetoglu, Cekdar/0000-0003-1222-4362
Anahtar Kelimeler
Preceramic Polymers, SiOC, HighSurface Area, Aerogels, HF Etching
Kaynak
Ceramics International
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
42
Sayı
10
