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Formation, Structure and Properties of Freeze-Cast Kaolinite-Silica Nanocomposites

2010; Wiley; Volume: 94; Issue: 4 Linguagem: Inglês

10.1111/j.1551-2916.2010.04212.x

1551-2916

Wenle Li, Kathy Lu, John Y. Walz,

Advanced ceramic materials synthesis

Journal of the American Ceramic SocietyVolume 94, Issue 4 p. 1256-1264 Formation, Structure and Properties of Freeze-Cast Kaolinite–Silica Nanocomposites Wenle Li, Wenle Li Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061Search for more papers by this authorKathy Lu, Corresponding Author Kathy Lu Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 *Member, The American Ceramic Society.†Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this authorJohn Y. Walz, John Y. Walz Chemical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061Search for more papers by this author Wenle Li, Wenle Li Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061Search for more papers by this authorKathy Lu, Corresponding Author Kathy Lu Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 *Member, The American Ceramic Society.†Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this authorJohn Y. Walz, John Y. Walz Chemical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061Search for more papers by this author First published: 10 November 2010 https://doi.org/10.1111/j.1551-2916.2010.04212.xCitations: 17 T. Ohji—contributing editor This was supported by National Science Foundation, under grant no. CBET-0827246, and by the American Chemical Society Petroleum Research Fund, grant no. 47421-AC9. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract This study is focused on understanding the effects of kaolinite content and freezing rate on the microstructure, surface area, and flexural strength of freeze-cast kaolinite–silica nanoparticle composites. Scanning electron microscopy reveals that the bulk of the composites contain interconnected pores and that the size of the pores increases with kaolinite concentration. Lowering the freezing rate from 2.0 to 0.05 K/min produces much larger pores on the outer surface of the sample and only minor effects on the bulk morphology. BET measurements indicate that the specific surface area (area/mass) of the composites is controlled primarily by the relative amounts of kaolinite and silica in the sample and not by the freezing rate. Equibiaxial flexural strength tests show that the strength of the composites is substantially higher than freeze-cast samples produced using either kaolinite only or silica only, indicating that the two components work cooperatively. The strength is slightly higher for composites produced at the lower freezing rate. 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