Macroporous polymer-derived SiO2/SiOC monoliths freeze-cast from polysiloxane and amorphous silica derived from rice husk

被引：47

作者：

Soltani, Niloofar ^{[1
,2
,3
]}

Simon, Ulla ^{[2
]}

Bahrami, Amin ^{[1
,2
,3
]}

Wang, Xifan ^{[2
]}

Selve, Soren ^{[4
]}

Epping, Jan Dirk ^{[5
]}

Pech-Canul, Martin I. ^{[3
]}

Bekheet, Maged F. ^{[2
]}

Gurlo, Aleksander ^{[2
]}

机构：

[1] Univ Nacl Autonoma Mexico, Inst Invest Mat, Ciudad Univ, Mexico City 04510, DF, Mexico

[2] Tech Univ Berlin, Fachgebiet Keram Werkstoffe, Chair Adv Ceram Mat, Inst Werkstoffwissensch & Technol, Hardenbergstr 40, D-10623 Berlin, Germany

[3] IPN, Unidad Saltillo, Ctr Invest & Estudios Avanzados, Ave Ind Met 1062,Parque Ind Saltillo Ramos Arizpe, Ramos Arizpe 25900, Coahuila, Mexico

[4] Tech Univ Berlin, Ctr Electron Microscopy, Str 17 Juni 135, D-10623 Berlin, Germany

[5] Tech Univ Berlin, Inst Chem Metalorgan & Inorgan Mat, Str 17 Juni 135-C2, D-10623 Berlin, Germany

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2017年 / 37卷 / 15期

关键词：

Polysiloxane; Freeze-casting; Porous ceramics; Rice husk ash; Polymer-derived ceramics; HIGH-TEMPERATURE STABILITY; SOLID-STATE NMR; PRECERAMIC POLYMERS; POROUS CERAMICS; MICROSTRUCTURE EVOLUTION; MATRIX COMPOSITES; SURFACE-AREA; CARBON; FABRICATION; FILLERS;

D O I：

10.1016/j.jeurceramsoc.2017.06.023

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A freeze-casting route towards macroporous SiOC/SiO2 ceramic nanocomposites from preceramic polymers was developed. Amorphous SiOC/SiO2 monolith with pore channels aligned along the freezing direction were obtained from commercially available methyl-phenyl-vinyl-hydrogen polysiloxane (Silres (R) H62C) and amorphous silica derived from rice husk ash freeze-cast with water or tert-butyl alcohol, crosslinked and pyrolyzed at 1100 degrees C in nitrogen. The influence of processing parameters such as solvent (tert-butyl alcohol or water), polymer to silica ratio (2:1, 1:1, 1:2), cooling rate (2, 4, 6 degrees C/min) and pre-crosslinking of polysiloxane on the porosity and structure of the obtained ceramic nanocomposites were assessed by X-ray tomography, XRD, solid state NMR, scanning electron microscopy and mercury porosimetry. The microstructure of SiOC ceramics derived from the Silres H62C polysiloxane was studied as well. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：4809 / 4820

页数：12

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