磁场中铁磁性胶粒的聚沉性质

分析了铁磁性胶粒及其周围电解质离子在磁场中的磁化行为和胶粒外磁场分布状况。利用双电层理论计算了在磁场作用下铁磁性胶粒周围离子的分布情况 ,给出磁场作用下胶粒间势能表达式、体系聚沉的临界磁场和聚沉速率表达式 ,并以常温常压下水溶胶在 0 .0 0 3T磁场作用下的情况为例进行了计算。结果表明 ,磁场作用对胶粒周围电解质离子浓度分布的影响较小 ,对铁磁性胶粒间势能和胶粒间聚沉速率的影响较大。粒子浓度为 10 16m-3的水溶胶体系发生聚沉的临界磁场强度为 0 .0 0 2 7T ,磁场作用加快了聚沉速率。

Coagulation properties of ferromagnetic particles

The magnetization of ferromagnetic particles and the electrolytic ions around them was investigated. The distribution of the magnetic field out of the particles was analyzed. The distribution of the ions around the feeromagnetic particles in the magnetic field was calculated with the theory of double electrode layer. The expressions of potential energy existing in colloid particles and the critical magnetic field of the systematic coagulation as well as the expression of coagulation velocity were given. The coagulation velocity of hydrosol in the magnetic field with a magnetic field strength of 0.003T at the normal pressure and temperature was calculated. The result shows that the magnetic field has a little influence on the density distribution of the electrolytic ions around the colloid particles, and it has a great effect on the potential energy of ferromagnetic particles and the coagulation velocity of colloid particles. The critical magnetic field strength of coagulation for the hydrosol system with a particle density of 10 16 m -3 is 0.0027T. The magnetic field may accelerate the coagulation velocity.