Mechanistic approach on heat induced growth of anionic surfactants: a clouding phenomenon
作者:Arti Bhadoria、Sugam Kumar、Vinod K. Aswal、Sanjeev Kumar
DOI:10.1039/c5ra01090j
日期:——
acid methyl ester (TBAMES) and tetra-n-butylphosphonium dodecylsulphate (TBPDS) were synthesized. Though all the surfactants are ionic in nature, they show the clouding phenomenon on heating. The effect of temperature on the solution behaviour (micellization and clouding) of the synthesized surfactants was studied by conductometry, dynamic light scattering (DLS), nuclear magnetic resonance (NMR), small
不同阴离子表面活性剂:四- ñ -butylammonium十二烷基(TBADS),四- ñ -butylammonium-α磺酸基肉豆蔻酸甲酯(TBAMES)和四- Ñ合成了十二烷基硫酸钠-丁基phosph(TBPDS)。尽管所有表面活性剂本质上都是离子表面活性剂,但它们在加热时会出现浑浊现象。通过电导法,动态光散射(DLS),核磁共振(NMR),小角中子散射(SANS)和偏振光学显微镜(POM)研究了温度对合成表面活性剂溶液行为(微粉化和混浊)的影响。学习。当针对温度作图时,TBADS的实验cmc数据显示出U形曲线。对于各种固定浓度的TBADS,电导率测量值随温度变化的趋势也不同。在较低的TBADS浓度下,电导率随温度升高而增加,而在较高的TBADS浓度下,电导率随温度升高而降低。具有温度的NMR数据也显示出与电导法观察到的相似的特性。随着温度的升高,NMR峰的增宽和分裂与胶束的生长和