基于多重光散射法及DLVO理论研究TiO_2纳米颗粒在有机溶剂中的分散稳定性

The Study of TiO_2 Nanoparticle Dispersity in Organic Solvents Based on Multiple Light Scattering and DLVO Theory

利用Turbiscan多重光散射法研究了不同浓度的TiO_2纳米颗粒在混合有机溶剂悬浮体系中的分散稳定性及其影响因素。考察了不同浓度TiO_2纳米颗粒在混合有机溶剂中的粒径变化情况。基于DLVO理论分析了TiO_2纳米颗粒分散稳定性的机理。研究结果表明:随着混合有机溶剂悬浮体系中TiO_2纳米颗粒浓度逐渐增大,悬浮体系稳定性趋于下降,TiO_2颗粒粒径逐渐增加且运动速率加快,其机制在于TiO_2粒子间的光子自由程逐渐降低,相互间的吸引作用力逐渐增大。

The size of TiO2nanoparticles,the stability and processes like sedimentation and clarification of the suspending mixed organic solvents system were investigated by employing multiple light scattering technique.The change of nanoparticle size in various concentration of suspending solutions with time had also been explored.In order to clarify the mechanism of these changes,the interaction of nanoparticles in the systems by applying DLVO theory was analyzed.The results showed that along with the increase of the TiO2nanoparticle concentrationin the suspending mixed organic solvents system,the suspending solution systems were increasingly unstable.The size of nanoparticles were increased gradually and the growth rate was also enhanced.The mechanism was that the mean free paths decreased and the attraction interaction increased gradually as well.