2008/07/01 by Keevin Béneut, Doru Constantin, Patrick Davidson +2
Energy · Engineering · Materials Science · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #Doping #Iron oxide chemistry and applications #Lamellar phase #Lamellar structure #Lyotropic #Nanorod #Phase (matter) #Pickering emulsions and particle stabilization #Pulmonary surfactant #Texture (cosmology) #Volume fraction #cond-mat.soft
paper · pdf · doi:10.1021/la800387a
published as Langmuir vol. 24(15), pp. 8205-8209 (2008)
openalex publication_date 2008/07/01 · arxiv created 2015/04/11 · arxiv updated 2015/04/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The dilute lamellar phase of the nonionic surfactant C 12EO 5 was doped with goethite (iron oxide) nanorods up to a fraction of 5 vol %. The interaction between the inclusions and the host phase was studied by polarized optical microscopy (with or without an applied magnetic field) and by small-angle X-ray scattering. We find that, when the orientation of the nanorods is modified using the magnetic field, the texture of the lamellar phase changes accordingly; one can thus induce a homeotropic-planar reorientation transition. On the other hand, the lamellar phase induces an attractive interaction between the nanorods. In more concentrated lamellar phases (under stronger confinement) the particles form aggregates. This behavior is not encountered for a similar system doped with spherical particles, emphasizing the role of particle shape in the interaction between doping particles and the host phase.