Nakata Satoshi, Kirisaka Junko, Arima Yoshie, Ishii Toshio
Department of Chemistry, Nara University of Education, Nara 630-8528, Japan.
J Phys Chem B. 2006 Oct 26;110(42):21131-4. doi: 10.1021/jp063827+.
Control of the self-motion of a camphanic acid disk on water was investigated upon the addition of different kinds of surfactants (Triton X-100 and Brij58 as neutral surfactants, cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, and sodium dodecyl sulfate (SDS) as an anionic surfactant) to the water phase. With an increase in the concentration of surfactant, continuous motion changed to no motion via intermittent motion (repetition between motion and rest), and the concentration regions of these motions were different among these surfactants. Although the concentration regions of these motions were determined by the surface tension for neutral surfactants, they were different than those for CTAB and SDS. These characteristics of self-motion are discussed in relation to the surface tension, depending on the concentration of individual surfactants, and the hydrophilic effect of the surfactants.
在水相中添加不同种类的表面活性剂（中性表面活性剂吐温80和Brij58、阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）以及阴离子表面活性剂十二烷基硫酸钠（SDS））后，研究了莰烷酸盘在水上的自运动控制。随着表面活性剂浓度的增加，连续运动通过间歇运动（运动和静止之间的重复）变为不运动，并且这些运动的浓度区域在这些表面活性剂之间有所不同。尽管这些运动的浓度区域由中性表面活性剂的表面张力决定，但它们与CTAB和SDS的不同。根据每种表面活性剂的浓度以及表面活性剂的亲水作用，结合表面张力对这些自运动特性进行了讨论。
