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Physical properties of aqueous suspensions of goethite (α-FeOOH) nanorods. Part I: In the isotropic phase

LEMAIRE, B. J ; DAVIDSON, P ; FERRE, J ; JAMET, J. P ; PETERMANN, D ; PANINE, P ; DOZOV, I ; JOLIVET, J. P

The European physical journal. E, Soft matter and biological physics, 2004-03, Vol.13 (3), p.291-308 [Periódico revisado por pares]

Heidelberg: Springer

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  • Título:
    Physical properties of aqueous suspensions of goethite (α-FeOOH) nanorods. Part I: In the isotropic phase
  • Autor: LEMAIRE, B. J ; DAVIDSON, P ; FERRE, J ; JAMET, J. P ; PETERMANN, D ; PANINE, P ; DOZOV, I ; JOLIVET, J. P
  • Assuntos: Chemistry ; Colloidal state and disperse state ; Exact sciences and technology ; General and physical chemistry ; Physical and chemical studies. Granulometry. Electrokinetic phenomena
  • É parte de: The European physical journal. E, Soft matter and biological physics, 2004-03, Vol.13 (3), p.291-308
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Depending on volume fraction, aqueous suspensions of goethite (alpha-FeOOH) nanorods form a liquid-crystalline nematic phase (above 8.5%) or an isotropic liquid phase (below 5.5%). In this article, we investigate by small-angle X-ray scattering, magneto-optics, and magnetometry the influence of a magnetic field on the isotropic phase. After a brief description of the synthesis and characterisation of the goethite nanorod suspensions, we show that the disordered phase becomes very anisotropic under a magnetic field that aligns the particles. Moreover, we observe that the nanorods align parallel to a small field (< 350 mT), but realign perpendicular to a large enough field (> 350 mT). This phenomenon is interpreted as due to the competition between the influence of the nanorod permanent magnetic moment and a negative anisotropy of magnetic susceptibility. Our interpretation is supported by the behaviour of the suspensions in an alternating magnetic field. Finally, we propose a model that explains all experimental observations in a consistent way.
  • Editor: Heidelberg: Springer
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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