A two-dimensional nematic phase of magnetic nanorods

Kostyantyn Slyusarenko (1) , Doru Constantin (1) , Patrick Davidson (1)

1 LPS - Laboratoire de Physique des Solides

We report a hybrid mesophase consisting of magnetic nanorods confined between the non-ionic surfactant bilayers of a lamellar phase. The magnetic field-induced ordering of the nanorods was measured experimentally and modeled by a two-dimensional Onsager theory including the third virial coefficient. The nanorods are strongly confined in layers, with no orientational coupling from one layer to the next. At high volume concentration they exhibit spontaneous in-plane orientational ordering and form a stack of independent two-dimensional nematic systems. This isotropic-nematic transition is first-order.

Mots clés: colloids; nematic; phase transition; x-ray scattering; birefringence; magnetism

Domaines: Matière Molle [cond-mat.soft]

Kostyantyn Slyusarenko, Doru Constantin, Patrick Davidson. A two-dimensional nematic phase of magnetic nanorods. Journal of Chemical Physics, 2014, 140 (10), pp.104904. ⟨10.1063/1.4867790⟩. ⟨hal-00958646⟩