The complex phase behaviour of suspensions of goethite (α-FeOOH) nanorods in a magnetic field

被引:52
|
作者
Lemaire, BJ
Davidson, P
Ferré, J
Jamet, JP
Petermann, D
Panine, P
Dozov, I
Stoenescu, D
Jolivet, JP
机构
[1] Univ Paris 11, Phys Solides Lab, CNRS, UMR 8502, F-91405 Orsay, France
[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[3] Nemoptic, F-78114 Magny Les Hameaux, France
[4] Univ Paris 06, Lab Chim Mat Condensee, CNRS, UMR 7574, F-75252 Paris, France
关键词
D O I
10.1039/b403074e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In 1902, Majorana reported the magneto-optical properties of aqueous colloidal suspensions of mixed iron oxides. Oddly enough, the magnetic-field induced birefringence displayed a non-monotonic dependence upon field intensity. This behaviour was later interpreted as due to the existence in these sols of at least two different chemical species. During the course of our studies of mineral liquid crystals, we have revisited this problem by examining aqueous suspensions of pure goethite (alpha-FeOOH) nanorods. Although they are comprised of a single chemical species, these suspensions show the same odd behaviour reported by Majorana. Moreover, we show that, as the volume fraction increases, the suspensions have an isotropic liquid/nematic/rectangular columnar phase sequence, with first-order transitions between these phases. The non-monotonic dependence of the field-induced birefringence can be explained by the existence of a remanent magnetic moment of the nanorods and the negative anisotropy of their magnetic susceptibility. Therefore, the nanorods align parallel to a weak field but realign perpendicular to the field beyond B-c approximate to 375 mT. In addition, other interesting phenomena appear upon application of a magnetic field: the disordered (i.e. isotropic in zero-field) phase becomes highly anisotropic and difficult to distinguish from the nematic phase. Both phases then acquire not only quadrupolar order but also dipolar order. The rectangular columnar phase is strongly stabilised versus the nematic one. Our experimental observations raise new theoretical questions about the phase diagram of these suspensions with respect to volume fraction and magnetic field intensity.
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收藏
页码:271 / 283
页数:13
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