SMALL-ANGLE LIGHT-SCATTERING STUDY OF QUASI-2-DIMENSIONAL STRUCTURES OF MAGNETIC PARTICLES

被引：4

作者：

HWANG, YH

WU, XL

机构：

[1] Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1993年 / 80卷 / 01期

关键词：

COLLOIDAL PHYSICS; DOMAIN STRUCTURE; INSTABILITY; MAGNETIC PARTICLE; PHASE TRANSITION;

D O I：

10.1016/0927-7757(93)80220-9

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：

We studied quasi-two-dimensional magnetic domain structures using a small-angle light scattering technique. The structures are formed when magnetic particles in an aqueous suspension between two parallel glass plates are assembled and oriented in a magnetic field H perpendicular to the plates. Three different structure regions can be identified, and they are bounded by two critical field lines Hc1(phi) and Hc2(phi). Below Hc1(phi) the system consists of single particles; between Hc1(phi) and Hc2(phi), the particles assemble into elongated disordered domains; and above Hc2(phi), the domains develop a strong in-plane correlation. In the strong field limit H much greater than Hc2, the structure factor of the magnetic fluid resembles that of a two-dimensional liquid. However, long lasting metastability and hysteresis observed in the experiment suggest that the system is essentially locked in a glassy state.

引用

页码：19 / 27

页数：9

共 8 条

[1] FLUCTUATION-INDUCED COUPLINGS BETWEEN DEFECT LINES OR PARTICLE CHAINS [J].