论文部分内容阅读
对于非离子表面活性剂聚氧乙烯月桂醚(Brij-35)/N,N-二甲基甲酰胺(DMF)/长链醇(庚醇,辛醇,壬醇,癸醇)体系,利用滴定微量量热仪测定了胶束形成过程的热功率-时间曲线.根据热力学理论,测定了临界胶束浓度和胶束形成热(ΔHmθ),计算了热力学函数(ΔGmθ和ΔSmθ).讨论了温度、醇中的碳原子数、醇的浓度与临界胶束浓度和热力学函数之间的关系.结果表明:聚氧乙烯月桂醚(Brij-35)/DMF/长链醇体系:(1)在含有相同浓度的各种醇的体系中,ΔHmθ和ΔSmθ的值随着温度的升高而增大;CMC,ΔGmθ的值随着温度的升高而降低;(2)在相同温度及相同浓度的醇体系中,CMC,ΔHmθ,ΔGmθ和ΔSmθ的值都随着醇中碳原子数的增加而降低;(3)在相同温度及相同醇的体系中,CMC,ΔHmθ,ΔSmθ和ΔGmθ的值随着醇的浓度的增加都减小.
For the nonionic surfactant Brij-35 / N, N-dimethylformamide / long chain alcohol (heptanol, octanol, nonanol, decanol) The thermodynamic power-time curve of the micellar formation process was determined by the microcalorimeter.The critical micelle concentration and the micelle formation heat (ΔHmθ) were measured according to the thermodynamic theory, and the thermodynamic functions (ΔGmθ and ΔSmθ) were calculated.The effects of temperature, The results showed that: Brij-35 / DMF / long-chain alcohol system: (1) In the same containing the same The values of ΔHmθ and ΔSmθ increased with the increase of temperature; the values of CMC and ΔGmθ decreased with the increase of temperature; (2) In the alcohol system with the same temperature and the same concentration, CMC, ΔHmθ, ΔGmθ and ΔSmθ all decrease with the increasing number of carbon atoms in the alcohol. (3) The values of CMC, ΔHmθ, ΔSmθ and ΔGmθ in the same temperature and in the same alcohol system decrease with increasing alcohol Increase in concentration decreases.