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Porous Spherical Shells and Microspheres by Electrodispersion Precipitation

Published online by Cambridge University Press:  15 February 2011

Michael T. Harris ,
Warren G. Sisson ,
Susan M. Hayes ,
Sophie J. Bobrowski  and
Osman A. Basaran
Michael T. Harris
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6224
Warren G. Sisson
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6224
Susan M. Hayes
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6224
Sophie J. Bobrowski
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6224
Osman A. Basaran
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6224
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Abstract

Pulsed electric fields have been used to enhance the dispersion of aqueous metal (Zr and Al) salt solutions from a nozzle and into a nonconducting liquid continuous phase that is immiscible with the aqueous phase. The diameter of the resulting microdroplets ranged in size from approximately 0.1 to 10 μm. Precipitation of hydrous metal oxides occurred as ammonia, which was dissolved in varying amounts in the continuous phase, diffused into the aqueous microdroplets. Spherical shells were formed at higher ammonia concentrations and microspheres were produced at lower ammonia concentrations. Upon drying, dimples appeared in the particles that were synthesized at higher ammonia concentrations. The latter result accords with the well known fact that under certain conditions spherical shells collapse when a fluid is extracted from the core of the particle. No dimples were observed in the microspheres that were produced at lower ammonia concentrations. Analog X-ray dot maps for aluminum and zirconium were done to determine the spatial distribution of each metal in the particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 372: Symposium W1 – Hollow and Solid Spheres and Microspheres--Science and Technology , 1994 , 43
Copyright
Copyright © Materials Research Society 1995

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References

[1] Rhodes, W.H., J. Am. Ceram. Soc., 64, 19 (1981).Google Scholar
[2] Downs, R.L., Ebner, M.A. and Miller, W.J., in Sol-Gel Technology for Thin Films, Fibers, Preforms, Electronics, and Specialty Shapes, edited by Klein, L.C. (Noyes Publication, Park Ridge, NJ, 1988), pp. 330–381.Google Scholar
[3] Liu, G. and Wilcox, D.L. Sr., Mat. Res. Soc. Symp. Proc., 346, 201 (1994).Google Scholar
[4] Brown, P., Am. Ceram. Bull., 72, 98 (1993).Google Scholar
[5] Green, D.J., J. Am. Ceram. Soc., 68, 403 (1985).Google Scholar
[6] Green, D.J. and Hoagland, R.G., J. Am. Ceram. Soc., 68, 395 (1985).Google Scholar
[7] Lee, P.I. and Good, W.R., Controlled-Release Technology: Pharmaceutical Applications, (ACS Symposium Series 348, New York, New York, 1987).Google Scholar
[8] EI-Nokaly, M.A., Piatt, D.M. and Charpentier, B.A., Polymer Delivery Systems: Properties and Applications, (ACS Symposium Series 520, San Francisco, California, 1993).Google Scholar
[9] Finch, C.A., Chem. Ind., 7, 208 (1989).Google Scholar
[10] Krieger, J., Chem. Eng. News, 66, 23 (1988).Google Scholar
[11] Kim, K. and Jang, K.Y., J. Am. Ceram. Soc., 74, 1987 (1991).Google Scholar
[12] Kendall, J.M., Proceedings of the Second International Colloquium on Drops and Bubbles, edited by Croissette, D.H. Le (JPL Publication 82–7, 1982), p. 79.Google Scholar
[13] Hendricks, C.D., Proceedings of the Second International Colloquium on Drops and Bubbles, edited by Le, D.H. (JPL Publication 82–7, 1982), p. 88.Google Scholar
[14] Ingebrethsen, B.J., Matijevic, E. and Partch, R.E., J. Colloid Interface Sci., [95], 228 (1981).Google Scholar
[15] Slamovich, E.B. and Lange, F.F., Mat. Res. Soc. Symp. Proc., 121, 257 (1988).Google Scholar
[16] Minehan, W.T. and Messing, G.L., J. Non-Cryst. Solids, 121, 375 (1990).Google Scholar
[17] Harris, M.T., Scott, T.C., and Byers, C.H., U. S. Patent No. 5 122 360 (16 June 1992).Google Scholar
[18] Harris, M.T., Scott, T.C., and Byers, C.H., U. S. Patent No. 5 207 973 (4 May 1993).Google Scholar
[19] Harris, M.T., Scott, T.C., Basaran, O.A., and Byers, C.H., Mat. Res. Soc. Proc. 121, 257 (1988).Google Scholar
[20] Harris, M.T., Sisson, W.G., and Basaran, O.A., Mat. Res. Soc. Proc. 271, 945 (1992).Google Scholar
[21] Harris, M.T., Scott, T.C., and Byers, C.H., Mat. Sci. Eng. A 168, 125 (1993).Google Scholar
[22] Harris, M.T., Sisson, W.G., Scott, T.C., Basaran, O.A.. Byers, C.H., Ren, W. and Meek, T.T., Mat. Res. Soc. Proc., 346, 171 (1994).Google Scholar
[23] Foss, W.R. and Davis, E.J., J. Aerosol Sci., 25, 33 (1994).Google Scholar
[24] Li, W., Rassat, S.D., Foss, W.R. and Davis, E.J., J. Colloid Interface Sci., 162, 267 (1994).Google Scholar
[25] Rubel, G.O., J. Appl. Phys., 61, 1633 (1987).Google Scholar