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Journal of Sol-Gel Science and Technology

, Volume 56, Issue 3, pp 287–299 | Cite as

Sol–gel derived mesoporous and microporous alumina membranes

  • Berna Topuz
  • Muhsin Çiftçioğlu
Original Paper

Abstract

Stable polymeric and colloidal boehmite sols were prepared by sol–gel process through controlled hydrolysis/condensation reactions. The particle sizes of the colloidal sols were in the 12–25 nm range depending on the process parameters and about 2 nm for polymeric sols. The presence of a significant increase in the microporosity content of the heat treated polymeric membranes relative to the mesoporous colloidal membranes might make the design of thermally stable microporous alumina membranes with controlled pore structures possible. The phase structure evolution in the 600–800 °C range had shown that the crystallization of the gamma alumina in the amorphous matrix starts at about 800 °C. This indicated that the pore structure stability may be enhanced through processing up to this relatively high temperature in polymeric alumina derived unsupported membranes. The permeance values of the two and three layered colloidal alumina membranes were observed to be independent of pressure which implies that the dominant gas transport mechanism is Knudsen diffusion in these structures. This was also supported by the 2.8 nm BJH pore sizes of the colloidal membranes. The Knudsen diffusion equation derived permeances of the polymeric alumina membranes with thicknesses of about 300 nm were determined to be very close to the experimentally determined permeance values.

Keywords

Sol–gel Alumina membranes Thermal stability Gas permeation 

Notes

Acknowledgments

The authors gratefully acknowledge the Middle East Technical University (METU) Central Laboratory for performing 27Al MAS-NMR characterization experiments. The authors thank the Centre for Materials Research at the İzmir Institute of Technology for XRD/SEM analysis.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Chemical Engineering Departmentİzmir Institute of TechnologyUrla, İzmirTurkey

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