Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-25T15:43:07.598Z Has data issue: false hasContentIssue false
  • English
  • Français

Phase Separation in Alkoxy-Derived Silica System Containing Polyacrylamide

Published online by Cambridge University Press:  17 March 2011

Kousuke Kawamoto ,
Kazuki Nakanishi  and
Teiichi Hanada
Kousuke Kawamoto
Affiliation:
Dept. Chemistry, Grad. Sch. Science, Kyoto University, Kitasirakawa, Sakyo-ku, Kyoto, 6068502, Japan
Kazuki Nakanishi
Affiliation:
Dept. Chemistry, Grad. Sch. Science, Kyoto University, Kitasirakawa, Sakyo-ku, Kyoto, 6068502, Japan
Teiichi Hanada
Affiliation:
Dept. Chemistry, Grad. Sch. Science, Kyoto University, Kitasirakawa, Sakyo-ku, Kyoto, 6068502, Japan
Get access

Abstract

By inducing phase separation parallel to the sol-gel transition of alkoxy-derived silica systems, gels having both macroporous and mesoporous structures can be obtained. Using poly(acrylamide) (PAAm) as a phase-separation inducer, macro/mesoporous silica gels were synthesized. After solvent exchange by water, the size distribution of mesopores of wet gels was evaluated by thermoporometry using a differential scanning calorimetry (DSC). Alternatively, gels were evaporation-dried after solvent exchange by ethanol or water/ethanol, followed by heat-treatment to completely remove volatile and organic components. Characterization of the dried or heat-treated samples was carried out using a scanning electron microscope (SEM) and by nitrogen adsorption measurements. Experimental results showed that the interaction between PAAm and silica is not so strong as the case of polymers having poly(oxyethylene) chains. The contribution of the secondary phase separation within the crosslinking silica-rich phase was suggested to be responsible for the mesopore formation in the PAAm-silica system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1007: Symposium S – Organic/Inorganic Hybrid Materials-2007 , 2007 , 1007-S04-01
Copyright
Copyright © Materials Research Society 2007

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

REFERENCES

1. Nakanishi, K., Minakuchi, H. and Soga, N., J. Sol-Gel Sci. Tech. 8, 547–552 (1997)Google Scholar
2. Tanaka, N., Kobayashi, H., Nakanishi, K., Minakuchi, H., Ishizuka, N., Anal. Chem. August 1, 421A–429A (2001)Google Scholar
3. Nakanishi, K., J. Porous Mater. 4, 67–112 (1997).Google Scholar
4. Nakanishi, K., Takahashi, R., Nagakane, T., Kitayama, K., Koheiya, N., Shikata, H. and Soga, N., J. Sol-Gel Sci. Tech. 17, 1–20 (2000)Google Scholar
5.Michael Landry, R., Thermochim. Acta 433, 27–50 (2005).Google Scholar
6. Yamamoto, T., Endo, A., Inagi, Y., Ohmori, T. and Nakaiwa, M., J. Colloid Interface Sci. 284, 614–620 (2005).Google Scholar
7. Yamamoto, T., Mukai, S.R., Nitta, K., Tamon, H., Endo, A., Ohmori, T. and Nakaiwa, M., Thermochim. Acta 439, 74–79 (2005).Google Scholar
8. Takahashi, R., Nakanishi, K. and Soga, N., Faraday Discuss. 101, 249–263 (1995).Google Scholar