Large magneto-optical birefringence of colloidal suspensions of α-FeOOH goethite nanocrystallites

被引：6

作者：

Li, Jian ^{[1
]}

Qiu, Xiaoyan ^{[1
]}

Lin, Yueqiang ^{[1
]}

Chen, Longlong ^{[1
]}

Liu, Xiaodong ^{[1
]}

Li, Decai ^{[2
]}

机构：

[1] Southwest Univ, Sch Phys Sci & Technol, Chongqing 400715, Peoples R China

[2] Beijing Jiaotong Univ, Sch Mech & Control Engn, Beijing 100044, Peoples R China

来源：

CHEMICAL PHYSICS LETTERS | 2013年 / 590卷

基金：

美国国家科学基金会;

关键词：

MAGNETIC-PROPERTIES; IRON FERROFLUIDS; NANOPARTICLES; PARTICLES; LIGHT; CRYSTALS; FLUIDS; FIELD; SCATTERING; ANISOTROPY;

D O I：

10.1016/j.cplett.2013.10.082

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：

A large magnetic-field induced birefringence (reduced value of approximately 10(-2)), was observed at 40 kA/m field strength for colloid suspensions of spherical goethite nanocrystallite. We ascribe this behavior of these suspensions to long-range orientation of optically equivalent ellipsoids, rather than long-ranged spatial ordering of building blocks (as liquid crystals) or interparticle interaction (as ferrofluids) from the magnetic field. Comparing experimental and theoretical results based on bulk properties, goethite nanocrystallites have refractive index approximately 10(3) times larger than that of the bulk; accordingly, dielectric constant is approximately 10(6) times larger in the optical-frequency regime. (C) 2013 Elsevier B. V. All rights reserved.

引用

页码：165 / 168

页数：4

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