摘要
本文对磁性流体薄膜在磁场中产生光的双折射效应的机理进行了实验观察和计算分析 ,发现磁性流体是一种特殊的方向性弱絮凝的胶体。弱絮凝是胶体到絮凝状态的一种临界状态 ,在一般胶体系统中弱絮凝行为表现不明显 ,作用和意义都不大。但磁性流体在磁场中的弱絮凝行为表现异常明显 ,既显示出特有的方向性 ,又不使胶体系统失稳 ,合乎磁性流体薄膜在磁场中产生光的双折射效应的事实 ,从而揭示了方向性弱絮凝使磁性流体薄膜在磁场中产生光的双折射效应的机理 。
The mechanism of how a thin film magnetic fluid shows optical birefringence in a magnetic field is analyzed. A magnetic fluid is found to be a directional colloid with weak flocculation, i.e. a fluid in a critical state from the colloidal state to that of flocculation. Once in a magnetic field a magnetic fluid with weak flocculation has its own particular direction, where the colloid system does not lose its stability. Thus the thin film magnetic fluid shows optical birefringence in a magnetic field revealing the mechanism that directional weak flocculation of the magnetic fluid causes optical birefringence in a magnetic field. This will provide design foundations for further research of optical instruments based on magnetic fluid.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2004年第3期300-303,共4页
Acta Armamentarii
基金
浙江省自然科学基金 ( 5 0 2 14 1)
宁波市科技攻关项目 ( 0 0 12 0 11)
关键词
磁性流体
磁场
双折射效应
胶体
絮凝状态
physical chemistry, magnetic fluid, directional weak flocculation, birefringence effect, mechanism
