Uniaxial and biaxial liquid crystal phases in colloidal dispersions of board-like particles

被引：37

作者：

van den Pol, E. ^{[1
]}

Thies-Weesie, D. M. E. ^{[1
]}

Petukhov, A. V. ^{[1
]}

Byelov, D. V. ^{[1
]}

Vroege, G. J. ^{[1
]}

机构：

[1] Univ Utrecht, Vant Hoff Lab Phys & Colloid Chem, Debye Inst Nanomat Sci, NL-3584 CH Utrecht, Netherlands

来源：

LIQUID CRYSTALS | 2010年 / 37卷 / 6-7期

关键词：

mineral liquid crystals; biaxial phases; colloids; magnetic particles; X-ray scattering; ALPHA-FEOOH NANORODS; NEMATIC PHASE; AQUEOUS SUSPENSIONS; PHYSICAL-PROPERTIES; MONTE-CARLO; TRANSITIONS; GOETHITE; MIXTURES; BEHAVIOR; RODLIKE;

D O I：

10.1080/02678291003798164

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Dispersions of board-like goethite (-FeOOH) particles with short-range repulsive interaction form a versatile colloidal model system, showing a nematic, smectic A and columnar phase. In high magnetic fields a biaxial nematic phase is induced with the shortest dimension of the particles aligned along the field. Moreover, if particles have a shape almost exactly in between rod-like and plate-like they can spontaneously, without external magnetic field, form biaxial nematic and biaxial smectic A phases, which is in accordance with theoretical predictions. The macroscopic domains were oriented by a magnetic field and their structure was revealed by small-angle X-ray scattering. Our results suggest that biaxial phases can be readily obtained by a proper choice of the particle shape.

引用

页码：641 / 651

页数：11

共 67 条

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