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以两种C60纳米颗粒悬浮液为对象,研究贮存时间、pH、电解质和有机物等因素对其稳定性的影响.结果表明,溶剂替换法制备的C60纳米颗粒(C60/son)稳定性优于延时搅拌法(C60/aq),可长时间保持稳定;pH升高可使C60纳米颗粒稳定性增强;电解质投加可使C60纳米颗粒的|ζ|减小、粒径增大,促进凝聚的发生;水中C60纳米颗粒凝聚过程可分为慢速凝聚和快速凝聚两个阶段,符合经典胶体稳定性(DLVO)理论.C60/son的临界凝聚浓度:NaCl 321 mmol·L-1、KCl 316 mmol·L-1、MgCl29.6 mmol·L-1和CaCl26.7 mmol·L-1,C60/aq的临界凝聚浓度:NaCl 295 mmol·L-1、KCl 278 mmol·L-1、MgCl27.8 mmol·L-1和CaCl25.9 mmol·L-1,均远高于其在天然水体中的浓度;腐殖酸存在可通过空间位阻效应显著增强水中C60纳米颗粒的稳定性,这表明C60纳米颗粒可稳定存在于典型的水环境中.
The effects of storage time, pH, electrolytes and organic compounds on the stability of the two kinds of C60 nanoparticle suspensions were studied.The results show that the stability of C60 / son prepared by solvent replacement is better than that of C60 / son (C60 / aq) can keep stable for a long time; the stability of C60 nanoparticles can be enhanced by the increase of pH; the | ζ | of C60 nanoparticles can be decreased, the particle size increases and the aggregation of (C60 / son): the concentration of C60 / son is 321 mmol·L-1, KCl is 316 mmol, the concentration of C60 / · The critical concentration of C60 / aq was 295 mmol·L-1, KCl 278 mmol·L-1, MgCl27.8 mmol·L-1 and CaCl25.9 mmol·L-1, respectively, were much higher than those in natural water. The presence of humic acid could significantly enhance the stability of C60 nanoparticles in water through steric hindrance, indicating that C60 Nanoparticles can be stably present in a typical aqueous environment.