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Neutron Scattering from a Ferrofluid

Published online by Cambridge University Press:  22 February 2011

Min Y. Lin
Affiliation:
Exxon Research and Engineering Co., Annandale, NJ 08801 National Institute of Standards and Technology, Gaithersburg, MD 20899
Weili Luo
Affiliation:
Dept. of Physics, University of Central Florida, Orlando, FL 32816
Jeffrey Lynn
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

Small angle neutron scattering experiments were performed on a eicosane-based ferrofluid. An average size of 88 Å can be extracted from the data, in agreement with results from electron microscopy. Below the frozen temperature of eicosane, however, the particles are seen to be in larger aggregates with a fractal dimension of 2.15, similar to those formed under reaction-limited cluster aggregation (RLCA) conditions. At high concentrations, particles form larger aggregates even in the liquid state. Applying a magnetic field introduces new structure and changes the density inside the aggregates.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

1 Rosensweig, R.E., Ferrohydrodynamics, (Cambridge University Press, New York, 1985).Google Scholar
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4 Zhu, Z., Lin, M.Y., and Tomkiewicz, M., this volume.Google Scholar
5 Rosensweig, R.E. and Popplewell, J., in Electromagnetic Forces and Applications, edited by Tani, J. and Takagi, T. (Elsevier Science Publishers, New York, p. 83.Google Scholar
6 Lin, M.Y., Lindsay, H. M., Weitz, D.A., Ball, R.C., Klein, R., and Meakin, P., Nature 339, 360 (1989).CrossRefGoogle Scholar

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