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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 11 — Nov. 1, 2006
  • pp: 2328–2335

Thermodiffusion of magnetite nanoparticles in ferrofluid-doped micellar systems and in ferrofluids investigated by using the single-beam Z-scan technique

Sarah Alves, Fabio Luiz Sant’Anna Cuppo, Alain Bourdon, and Antonio Martins Figueiredo Neto  »View Author Affiliations


JOSA B, Vol. 23, Issue 11, pp. 2328-2335 (2006)
http://dx.doi.org/10.1364/JOSAB.23.002328


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Abstract

The Z-scan experimental technique is used to measure the concentration-dependent Soret coefficient of surfacted magnetic nanoparticles in water [pure ferrofluid (FF)] and in a micellar lyotropic mixture [lyotropic doped with ferrofluid (FL)]. In both cases, the magnetic-particle contribution to the Soret coefficient is shown to be proportional to its concentration. In the case of the ferrofluid-doped lyotropic system, it was possible to evaluate the Soret coefficient associated with the micelles under a temperature gradient. The thermal diffusion coefficients keep the relation D T FL 0.4 × D T FF . The Soret effective mobilities evaluated are μ s FF 6 × 10 11 s kg 1 and μ s FL 2 × 10 11 s kg 1 for the pure ferrofluid and micellar media, respectively. From a nanoscopic point of view, the smaller value of μ s FL when compared to μ s FF could be pictured as an additional resistance of the micellar medium to the particle’s flow imposed by the temperature gradient. This procedure gives a new way of determining the Soret coefficient of a weakly absorbing medium.

© 2006 Optical Society of America

OCIS Codes
(160.3710) Materials : Liquid crystals
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter

ToC Category:
Nonlinear Optics

History
Original Manuscript: April 3, 2006
Revised Manuscript: July 13, 2006
Manuscript Accepted: July 14, 2006

Citation
Sarah Alves, Fabio Luiz Sant'Anna Cuppo, Alain Bourdon, and Antonio Martins Figueiredo Neto, "Thermodiffusion of magnetite nanoparticles in ferrofluid-doped micellar systems and in ferrofluids investigated by using the single-beam Z-scan technique," J. Opt. Soc. Am. B 23, 2328-2335 (2006)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-23-11-2328

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