Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
J Colloid Interface Sci. 2012 Sep 15;382(1):82-9. doi: 10.1016/j.jcis.2012.05.047. Epub 2012 Jun 7.
Cetyldimethylbenzylammonium chloride (CDBACl) or cetyltrimethylammonium bromide (CTAB) is preadsorbed on mercury and used as substrate. The adsorptive stripping voltammetry with the two-step procedure is used. The mercury droplet with the preadsorbed surfactant is expanded in aqueous solutions of KCl, KBr, CTAB, CDBACl, or cetylethyldimethylammonium bromide (CEDAB). The surface area was increased from 0.0022cm(2) up to 0.0571cm(2). The surfactant molecules are maintained close to each other and in the vicinity of the electrode by the applied electric field. The expanding of the droplets resulted in a reorientation of the adsorbed molecules depending on the surfactant surface concentration. In some cases, condensed films were observed. Differences were noticed in the adsorption and desorption potential region. A linear increase in the capacitance current with the surface area was found in all cases up to a maximum increase in the surface area. Partly disorganized films were also observed. In some cases, defects were noticed during expansion. In one case, fractal structure was observed.
十六烷基二甲基苄基氯化铵（CDBACl）或十六烷基三甲基溴化铵（CTAB）预吸附在汞上用作基底。采用两步程序的吸附溶出伏安法。预吸附表面活性剂的汞滴在 KCl、KBr、CTAB、CDBACl 或十六乙基二甲基溴化铵（CEDAB）的水溶液中膨胀。表面积从 0.0022cm(2)增加到 0.0571cm(2)。通过施加电场，表面活性剂分子彼此靠近并靠近电极。液滴的膨胀导致吸附分子根据表面活性剂的表面浓度重新定向。在某些情况下，观察到凝聚膜。在吸附和解吸电位区域注意到差异。在所有情况下，都发现电容电流随表面积呈线性增加，直到表面积最大增加。也观察到部分组织不良的薄膜。在某些情况下，在膨胀过程中注意到缺陷。在一种情况下，观察到分形结构。
