Grosse Constantino, Pedrosa Susana, Shilov Vladimir Nikolaievich
Departamento de Física, Universidad Nacional de Tucumán, Avenida Independencia 1800, San Miguel de Tucumán, 4000, Argentina.
J Colloid Interface Sci. 2002 Jul 15;251(2):304-10. doi: 10.1006/jcis.2002.8409.
The dependence of the DC conductivity of diluted colloidal suspensions on the size, zeta potential, and state of motion of the dispersed particles is analyzed both theoretically and numerically. It is shown that the simple formula that represents the conductivity as a sum of products: charge times mobility, taken over all the carriers present in the suspension, is only valid for exceedingly low values of the product kappaa. In contrast, the formulation based on the value of the dipolar coefficient of the suspended particles seems to be valid for all the range of particle sizes. This assertion is only true if the dipolar coefficient is calculated taking into account the electrophoretic motion of the particles. For very low values of the product kappaa, the dipolar coefficient of particles free to move can be several orders of magnitude larger than that of immobile particles.
从理论和数值两方面分析了稀释胶体悬浮液的直流电导率对分散颗粒的尺寸、zeta电位和运动状态的依赖性。结果表明，将电导率表示为悬浮液中所有载流子的电荷乘以迁移率之和的简单公式，仅在κappaα乘积的值极低时才有效。相比之下，基于悬浮颗粒偶极系数值的公式似乎在所有粒径范围内都是有效的。只有在计算偶极系数时考虑颗粒的电泳运动，这一断言才成立。对于κappaα乘积的极低值，自由移动颗粒的偶极系数可能比固定颗粒的偶极系数大几个数量级。
