Hostname: page-component-745bb68f8f-f46jp Total loading time: 0 Render date: 2025-01-14T22:28:05.799Z Has data issue: false hasContentIssue false
  • English
  • Français

The role of phase changes in maintaining pore structure on thermal exposure of aluminosilicate aerogels

Published online by Cambridge University Press:  14 September 2017

Frances I. Hurwitz ,
Richard B. Rogers ,
Haiquan Guo ,
Kevin Yu ,
Jennifer Domanowski ,
Eric Schmid  and
Meredith G. Fields
Frances I. Hurwitz*
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, USA
Richard B. Rogers
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, USA
Haiquan Guo
Affiliation:
Ohio Aerospace Institute, Cleveland, OH 44142, USA
Kevin Yu
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
Jennifer Domanowski
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
Eric Schmid
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
Meredith G. Fields
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
*
Address all correspondence to F. I. Hurwitz at frances.hurwitz@nasa.gov
Get access

Abstract

A variety of applications from insulation to catalytic supports can benefit from lightweight, high surface area, mesoporous materials, which maintain their mesoporous structure to temperatures of 900–1200 °C. Silica aerogels begin to densify by 700 °C. Alumina aerogels are capable of higher temperature exposure than their silica counterparts, but undergo successive phase transformations to form transitional aluminas prior densifying to α-alumina. The present study characterizes the phase transitions of aluminosilicate aerogels derived from Boehmite powders to elucidate the role of time and temperature on phase transitions, surface area, and morphology. Aerogel compositions stable to 1200 °C for periods of 24 h have been demonstrated.

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 3 , September 2017 , pp. 642 - 650
Copyright
Copyright © Materials Research Society 2017 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Mizushima, Y. and Hori, M.: Preparation of heat-resistant alumina aerogels. J. Mater. Res. 8, 2993–2999 (1993).Google Scholar
2.Kayser, S., Shter, G., de Hazan, Y., Cohen, Y., and Grader, G.S.: Heat treatment of alumina aerogels. Chem. Mater. 9, 2464–2467 (1997).Google Scholar
3.Pecharromán, C., Sobrados, I., Iglesias, J.E., González-Correño, T., and Sanz, J.: Thermal evolution of transitional aluminas followed by NMR and IR spectroscopies. J. Phys. Chem. B 103, 6160–6170 (1999).Google Scholar
4.Horiuchi, T., Osaki, T., Sugiyama, T., Suzuki, K., and Mori, T.: Maintenance of large surface arrea of alumina heated at elevated temperatures above 1300 °C by preparing silica-containing pseudoboehmite aerogel. J. Non-Cryst. Solids 291, 187–198 (2001).Google Scholar
5.Yoldas, B.E.: Alumina sol preparation from alkoxides. Am. Ceram. Soc. Bull. 54, 289–290 (1975).Google Scholar
6.Yoldas, B.E.: Alumina gels from porous transparent Al2O3. J. Mater. Sci. 10, 1856–1860 (1975).Google Scholar
7.Pierre, A.C., Elaloui, E., and Pajonk, G.M.: Comparison of the structure and porous texture of alumina gels synthesized by different methods. Langmuir 14, 66–73 (1998).Google Scholar
8.Popa, A.F., Rossignol, S., and Kappenstein, C.: Influence of drying technique on silicon insertion into c-alumina and consequences for the homogeneity and thermal stability of silica–alumina aquagels. J. Mater. Chem. 12, 2866–2868 (2002).Google Scholar
9.Hurwitz, F.I., Gallagher, M., Olin, T.C., Shave, M.K., Ittes, M.I., Olafson, K.N., Fields, M.G., Rogers, R.B., and Guo, H.: Optimization of alumina and aluminosilicate aerogel structure for high temperature performance. Int. J. Appl. Glass Sci. 5, 276–286 (2014).Google Scholar
10.Hurwitz, F.I., Guo, H., Rogers, R.B., Sheets, E.J., Miller, D.R., Newlin, K.N., Shave, M.K., Palczer, A.R., and Cox, M.T.: Influence of Ti addition on Boehmite-derived aluminum silicate aerogels: structure and properties. J. Sol-Gel Sci. Technol. 64, 756–764 (2012).Google Scholar
11.Brühne, S., Gottleib, S., Assmus, W., Alig, E., and Schmidt, M.U.: Atomic structure analysis of nanocrystalline boehmite AlO(OH). Cryst. Growth Des. 8, 489–493 (2008).Google Scholar
12.Klug, F.J., Prochazka, S., and Doremus, H.: Alumina-silica phase diagram in mullite region. J. Am. Ceram. Soc. 70, 750–759 (1987).Google Scholar
13.Aravind, P.R., Munkundan, P., Pillai, O.K., and Warrier, K.G.K.: Mesoporous silica-alumina aerogels with high thermal pore stability through hybrid sol-gel route followed by subcritical drying. Microporous Mesoporous Mater. 96, 14–20 (2004).Google Scholar
14.Chen, X.Y., Huh, H.S., and Lee, S.W.: Hydrothermal synthesis of Boehmite (γ-AlOOH) nanoplatelets and nanowires: pH controlled morphologies. Nanotechnology 18, 285608 (2007).Google Scholar
15.Voll, D. and Beran, A.: Dehydration process and structural development of cordierite ceramic precursors derived from FTIR spectroscopic investigations. Phys. Chem. Miner. 29, 545–551 (2002).Google Scholar
16.Voll, D., Lengauer, C., Berani, A., and Schneider, H.: Infrared band assignment and structural refinement of Al–Si, Al–Ge, and Ga–Ge mullites. Eur. J. Mineral. 13, 591–604 (2001).Google Scholar
17.MacKenzie, K.J.D.: Infrared frequency calculations for ideal mullite (3Al2O3·2SiO2). J. Am. Ceram. Soc. 55, 68–71 (1972).Google Scholar
18.Boumaza, A., Favaro, L., Lédion, J., Sattonnay, G., Brubach, J.B., Berthet, P., and Huntz, A.M.: Transition alumina phasses induced by heat treatment of boehmite: an X-ray diffraction and infrared spectroscopy study. J. Solid State Chem. 182, 1171–1176 (2009).Google Scholar
19.Sinkó, K., Mezei, R., Rohonczy, J., and Fratzl, P.: Gel structures containing Al(III). Langmuir 15, 6631–6636 (1999).Google Scholar
20.Krodikis, X., Raybaud, P., Gobichon, A.-E., Rebours, B., Euzen, P., and Toulhoat, H.: Theoretical study of the dehydration process of boehmite to γ-alumina. J. Phys. Chem. B 105, 5121–5130 (2001).Google Scholar
21.Pakharukova, V.P., Shalygin, A.S., Gerasimov, E.Y., Tsybulya, S.V., and Martyanov, O.N.: Structure and morphology evolution of silica-modified pseudoboehmite aerogels during heat treatment. J. Solid State Chem. 233, 294–302 (2016).Google Scholar