静电场诱导十二烷基硫酸钠结晶行为的研究

用透射电镜、X射线衍射及DSC等方法 十二烷基硫酸钠（SDS）极稀水溶液（溶液介于临界聚集浓度和临界胶束浓度之间）在静电场作用下的结晶行为,静电场作用诱导SDS形成规则的四方单晶与从甲醇中重结晶所得样品的晶体结构相同,DSC结果表明,从有序到无序结构变化的一级相转变热焓相同,但由于电场诱导结晶的晶体较小而表现为转变温度的降低,没有施加静电场处理的样品只具有较低的有序程度。

The Crystallizing Behavior of Sodium Dodecyl Sulfate Under a Electro-static Field

It was confirmed that sodium dodecyl sulfate(SDS) in dilute water solution (higher than its critical aggregation concentration, but lower than its critical micelle concentration) can be crystallized under the treatment of an electro static field from TEM, X ray diffraction and DSC experiments. With the effect of the electro static field, the high order single crystals can be formed, and its crystal structure was the same as that from the recrystallized sample in methanol as judged from X ray diffraction spectra. In DSC, the enthalpy, corresponding to the first order phase transition from order to disorder structure, was equal between these two samples, but the transition temperature was lower as its crystal size was smaller. On the contrary, the sample without the electro static field treatment only has much lower order structure.