中文摘要：

调查以水为基的 ferrofluid 的分散机制，在有不同酸碱值值的分散的系统的 ferrofluid 的可分散性上的电解质的效果被讨论。磁性的 nano 粒子的 ζ-potential 被测量在磁铁矿粒子的表面上发现油酸盐组的吸附物状态。共存的电解质影响的机制可分散性被学习。结果证明电解质在表面活化剂双性人层吸附的结构上通过效果影响 ferrofluid 的稳定性，它被测量的 ζ-potential 证明。联系机制位、静电在水的 ferrofluid 是主导的。

英文摘要：

To investigate dispersion mechanism of water-based ferrofluid, the effects of electrolytes on the dispersibility of ferrofluid in the dispersing system with different pH values were discussed. The ζ-potential of magnetic nano-particles was measured to discover the adsorbent state of oleate group on the surface of magnetite particles. The mechanism that coexisting electrolyte influences the dispersibility was studied. The results show that the electrolyte affects the stability of ferrofluid through an effect on the structure of surfactant bilayer adsorption, which was proved by ζ-potential measured. The associated mechanism of steric and electrostatic is dominant in aqueous ferrofluid.