Hoque Jiaul, Gonuguntla Spandhana, Yarlagadda Venkateswarlu, Aswal Vinod K, Haldar Jayanta
Chemical Biology and Medicinal Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India.
Phys Chem Chem Phys. 2014 Jun 21;16(23):11279-88. doi: 10.1039/c3cp55244f. Epub 2014 Apr 30.
This study provides an insight into the micellar aggregation properties in aqueous solutions of various gemini surfactants bearing one or more amide groups at the side chains and/or in the spacer by conductivity and small angle neutron scattering (SANS) studies. The amide functionality was found to enhance the surfactant aggregation properties as compared to the surfactants having no amide bond. Furthermore, the aggregation properties of the gemini surfactants bearing amide groups were found to strongly depend on the position and number of amide bonds. With the increase in the number of amide bonds, the aggregation number (N) and the size of the micelles increased. Additionally, the size and shape of the micelles were also found to depend both on the hydrocarbon chain length and the spacer chain length. It was also found that the aggregation number and the size of the micelles increased with an increase in concentration and decreased with an increase in temperature. The critical micellar concentration (CMC) values of the gemini surfactants obtained by a conductometric method were found to vary greatly with variation in the hydrocarbon chain.
本研究通过电导率和小角中子散射（SANS）研究，深入了解了侧链和/或间隔基带有一个或多个酰胺基团的各种双子表面活性剂在水溶液中的胶束聚集性质。与没有酰胺键的表面活性剂相比，发现酰胺官能团增强了表面活性剂的聚集性质。此外，发现带有酰胺基团的双子表面活性剂的聚集性质强烈依赖于酰胺键的位置和数量。随着酰胺键数量的增加，聚集数（N）和胶束尺寸增大。另外，还发现胶束的尺寸和形状既取决于烃链长度，也取决于间隔链长度。还发现，胶束的聚集数和尺寸随浓度增加而增大，随温度升高而减小。通过电导法获得的双子表面活性剂的临界胶束浓度（CMC）值随烃链的变化而有很大差异。
