磁场对苯胺电聚合的影响

The Effects of Magnetic Field onthe Electropolymerization of Aniline

本文研究了外加磁场对苯胺电聚合过程的影响．在Ｈ＿２ＳＯ＿４介质中，当磁场方向垂直电极表面时，在０．５８Ｔ处聚合速度最大，约为无磁场影响下的２倍；当磁场方向平行电极表面时，随磁场强度的增加聚合速度也增大，在０．７Ｔ时约为无磁场影响下的２．４倍；膜的成核生长是在动力学控制下的二维瞬时成核过程．此外，在ＨＣｌ、ＨＣｌＯ＿４、ＨＢＦ＿４介质中，也观察到磁场的增强现象．

The aniline electropolyinerization under the magnetic field was studied by cyclicvoltammetry and potentiostatic step techniques. Theinaximum peak current was obtained at 0. 58 Twhen the magnetic flux was perpendicular to the surface of the working electrede in H_2SO_4 solution.These were speculated in terins of magnetic dircctional effect. But when the magneic flux directed inparallcl with the surface of elcctrode, the peak current obviously increased as the magnetic flux densityrised. The results uere explained as the enhancement of mass transfer by magnetohydredynamic(MHD) mechanism. The PAN film growth via a two-dimentional (2-D) instantaneous nucleationunder the electron transfer kinetic controlled. The enhanced effects were also obtained in HCl、 HClO_4、HBF_4 solutions.