Optical activity of microemulsion induced by electric field and its tunable behaviors  

作　　者：赵晓鹏 赵乾 向礼琴 

机构地区：[1]Institute of Electrorheological Technology,Department of Applied Physics,Northwestern Polytechnical University,Xi'an 710072,China International Center for Materials Physics,Chinese Academy of Sciences,Shenyang 110015,China [2]Institute of Electrorheological Technology,Department of Applied Physics,Northwestern Polytechnical University,Xi'an 710072,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2003年第2期164-172,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.59832090);the National Natural Science Foundation of China for Distinguished Young Scholar(Grant No.50025207).

摘　　要：It has been shown that optical activity can occur in microemulsion under external electric field and rotation angle can also be tuned by the electric field. A set of microemulsions (water/Span80/transformer oil) with different water concentration were prepared and their optical activity was measured with the changes of applied electric field and θ, the angle between the electric vector of the incident linearly polarized light and the external electric field, using an automatic polarimeter. The experiments indicate that when none of the external electric field, water concentration and θ are zero, there is optical activity in microemulsions. For a given concentration, rotation angle ψ increases with electric field, and it firstly increases, passes through a maximum at C = C0,then monotonically decreases as C increases when electric field keeps constant. The relationship between the rotation angle and θ is also obtained. It is thought that the electric field-induced destroy of spatial symmetry of microemulsion is responsible for the optical activity of microemulsion.It has been shown that optical activity can occur in microemulsion under external electric field and rotation angle can also be tuned by the electric field. A set of microemulsions (water/Span80/transformer oil) with different water concentration were prepared and their optical activity was measured with the changes of applied electric field and θ, the angle between the electric vector of the incident linearly polarized light and the external electric field, using an automatic polarimeter. The experiments indicate that when none of the external electric field, water concentration and θ are zero, there is optical activity in microemulsions. For a given concentration, rotation angle ψ increases with electric field, and it firstly increases, passes through a maximum atC=C 0, then monotonically decreases asC increases when electric field keeps constant. The relationship between the rotation angle and θ is also obtained. It is thought that the electric field-induced destroy of spatial symmetry of microemulsion is responsible for the optical activity of microemulsion.

关 键 词：SOFT matter  optical activity  microemulsion. 

分 类 号：O482[理学—固体物理]