Abstract
Non-supported γ-alumina films are prepared from a boehmite colloidal suspension. After calcination at 600°C, the microstructure is characterized by a mean pore diameter of 3 nm, a porosity of 50% and a tortuosity of 5.5. The structure is formed by card packed, plate-shaped particles, giving rise to slit-shaped pores. Supported γ-alumina films, made by a slipcasting process using the same boehmite precursor, have a similar structure as the non-supported films. The slipcasting process is very sensitive to support characteristics and frequently yields defect films. Polyvinylalcohol (PVA) (molecular weight 72000 g mol−1) is added to the boehmite precursor (0.25 gg−1 film) to improve this process. This addition results in a less critical and better controllable drying and calcining procedure. The addition of PVA is necessary to slipcast defect free γ-alumina films on supports with pore diameters of 0.4 μm or smaller and on multi-layer supports. It has no significant effect on the resultant microstructure of the γ-alumina film, provided all PVA is removed by appropriate thermal treatment. The slipcasting rate is slower, resulting in thinner films of 3–5 μm at identical slipcasting times.
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References
A. J. Burggraaf and K. Keizer, in “Inorganic membranes” Ch. II, edited by R. Bhave (Van Nostrand, New York, 1991).
R. Schnabel and W. Vaulont, Desalination 21 (1978) 249.
J. Gillot, EPA 0092840 B1 (1987).
M. J. Gieselman, M. A. Anderson, M. D. Moosemiller and C. G. Hill, Sep. Sc. Techn. 23 (1988) 1695.
L. Cot, C. Guizard and A. Larbot, Indus. Ceram. 8 (1988) 143.
M. Asaeda and L. D. Du, J. Chem. Engng Jpn 19 (1986) 72.
A. F. M. Leenaars and A. J. Burggraaf, J. Coll. Interf. Sci. 105 (1985) 27.
Idem., J. Membr. Sci. 24 (1985) 261.
A. F. M. Leenaars, K. Keizer and A. J. Burggraaf, J. Mater. Sci. 19 (1984) 1077.
A. F. M. Leenaars and A. J. Burggraaf, J. Membr. Sci. 24 (1985) 245.
Y. S. Lin, K. J. de Vries and A. J. Burggraaf, J. Mater. Sci. 26 (1991) 715.
K. P. Kumar, J. H. L. Voncken, C. Lijzenga, K. Keizer and A. J. Burggraaf, in Proceedings of ICOM '90, Chicago, accepted for publication.
R. J. R. Uhlhorn, PhD Thesis, University of Twente, Twente, 1990.
K. S. W. Sing, Pure & Appl. Chem. 57 (1985) 603.
S. J. Gregg and K. S. W. Sing, “Adsorption, surface area and porosity” (Academic Press, London-New York, 1982) Ch. 3.
L. Zeman and M. Wales, Sep. Sci. Technol. 16 (1981) 275.
C. A. Finch, in “Polyvinyl alcohol: properties and applications” edited by C. A. Finch (J. Wiley & Sons, New York, 1973) 183.
V. T. Zaspalis, PhD Thesis, University of Twente, Twente, 1990, Ch. 2 accepted for publication in J. Mater. Science (1991).
P. C. Carman, Trans. Inst. Chem. Engng 15 (1937) 150.
M. N. Sarbolouki, Sep. Sci. Technol 17 (1982) 381.
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Uhlhorn, R.J.R., Veld, M.H.B.J.H.I., Keizer, K. et al. Synthesis of ceramic membranes. J Mater Sci 27, 527–537 (1992). https://doi.org/10.1007/BF00543947
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DOI: https://doi.org/10.1007/BF00543947