Mechanically Strong and Hierarchical Porous Silica Ceramics via Gelcasting-Lyophilization

Abstract:

Highly porous silica ceramics were prepared by in-situ gelation of an aqueous suspension with well dispersed silica particles and N’N-dimethylacrylamide (DMAA) monomer, followed by lyophilization and pressureless sintering. The gelcasting process was imparted by polymerization of DMAA. The silica raw materials used in this experiment are the dusts collected from the exhaust fumes of silicon industry. The as-obtained porous silica ceramics had three-dimensional and hierarchical pore structure and the porosity ranged from 75 to 88 % as the sintering temperature varied from 850 to 1050 °C. In addition, the porous silica ceramics appeared to have strong mechanical strength. Compressive strength of the porous silica ceramics was as high as 3.2 MPa even when the porosity was nearly 80%. The gelcasting-lyophilization method was proved to be a novel and promising route for the preparation of highly porous and mechanically strong materials.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 414-418
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.414
• Online since: July 2016
• Authors: Wei Wan, Jian Yang*, Yong Bao Feng, Tai Qiu
• Keywords: Gelcasting, Lyophilization, Porous Ceramics, Silica

References

[1] W. Li, K. Lu, J.Y. Walz, et al., Effects of rod-like particles on the microstructure and strength of porous silica nanoparticle composite, J. Am. Ceram. Soc. 96 (2013) 398-406.

DOI: 10.1111/jace.12128

[2] J.C. Han, L.Y. Hu, Y.M. Zhang, et al., In situ synthesis of hierarchically porous silica ceramics with unidirectionally aligned channel structure. Scripta Mater. 62 (2010) 431-4.

DOI: 10.1016/j.scriptamat.2009.12.019

[3] F.Z. Zhang, T. Kato, M. Fuji, et al., Gelcasting fabrication of porous ceramics using a continuous process. J. Eur. Ceram. Soc. 26 (2006) 667-71.

[4] X.H. Zhu, D.L. Jiang, S.H. Tan, et al., Improvement in the strut thinkness of reticulate porous ceramics, J. Am. Ceram. Soc. 84 (2001) 1654-1656.

[5] F.K. Yang, C.W. Li, Y.M. Lin, et al., Effects of sintering temperature on properties of porous mullite/corundum ceramics. Mater. Let. 73 (2012) 36-9.

DOI: 10.1016/j.matlet.2011.12.087

[6] J.M. Thomas, B.F. G, Johnson, R. Raja, et al., High performance nanocatalysts for single-step hydrogenations. Acc. Chem. Res. 36 (2003) 20-30.

DOI: 10.1021/ar990017q

[7] O.D. Velev, T.A. Jede, R.F. Lobo, et al., Microstructured porous silica obtained via colloidal crystal templates, Chem. Mater. 1998, 10 (1998) 3597-3602.

DOI: 10.1021/cm980444i

[8] R.A. Caruso, M. Antonietti, Silica films with bimodal pore structure prepared by using membranes as templates and amphiphiles as porogens. Adv. Funct. Mater., 12 (2002) 307-12.

DOI: 10.1002/1616-3028(20020418)12:4<307::aid-adfm307>3.0.co;2-9

[9] R.F. Chen, C.A. Wang, Y. Huang, et al., Ceramics with special porous structures fabricated by freeze-gelcasting: using tert-butyl alcohol as a template, J. Am. Ceram. Soc. 90 (2007) 3478-3484.

DOI: 10.1111/j.1551-2916.2007.01957.x

[10] O. Lyckfeldt, J.M.F. Ferreira, Processing of porous ceramics by starch consolidation, J. Euro. Ceram. Soc. 18 (1998) 131-40.

[11] O.D. Velev, T.A. Jede, R.F. Lobo, et al., Porous silica via colloidal crystallization, Nat. 389 (1997) 447-448.

DOI: 10.1038/38921

[12] D.B. Kuang, T. Brezesinski, B. Smarsly, Hierachical porous silica materials with a trimodal pore system using surfactant templates, J. Am. Chem. Soc. 126 (2004) 10534-10535.

DOI: 10.1021/ja0470618

[13] C.R. Rambo, H. Sieber, Novel synthetic route to biomorphic Al2O3 ceramics. Adv. Mater. 17 (2005) 1088-91.

DOI: 10.1002/adma.200401049

[14] U.T. Gonzenbach, A.R. Studart, D. Steinlin, Processing of particle-stabilized wet foams into porous ceramics, J. Am. Ceram. Soc. 90 (2007) 3407-14.

DOI: 10.1111/j.1551-2916.2007.01907.x

[15] H. Nishihara, S.R. Mukai, D. Yamashita, et al., Ordered macroporous silica by ice templating, Chem Mater, 2005, 17: 683-689.

DOI: 10.1021/cm048725f

[16] Y.M. Zhang, L.Y. Hu, J.C. Han, et al., Soluble starch scaffolds with uniaxial channel structure for in situ synthesis of hierarchically porous silica ceramics, Micropor. Mesopor. Mat. 130 (2010) 327-32.

DOI: 10.1016/j.micromeso.2009.11.030

[17] W. Wan, Y.B. Feng, J. Yang, et al., Preparation of mesoporous silica ceramics with relatively high strength from industrial wastes by low-toxic aqueous gel-casting, J. Eur. Ceram. Soc. 35 (2015) 2163-2170.

DOI: 10.1016/j.jeurceramsoc.2015.01.011