Strubbe Filip, Verschueren Alwin R M, Schlangen Luc J M, Beunis Filip, Neyts Kristiaan
Ghent University, Electronics and Information Systems, Sint-Pietersnieuwstraat 41, Ghent B-9000, Belgium.
J Colloid Interface Sci. 2006 Aug 1;300(1):396-403. doi: 10.1016/j.jcis.2006.03.050. Epub 2006 Mar 27.
Electrically charged species in nonaqueous media still hold many questions. Recent studies and applications show the need for a better understanding of the origin and nature of these charged species. Transient current measurements have been used to study the conductivity of nonaqueous liquid containing charged inverse micelles. At small time scales (1-100 ms) drift and diffusion of charged species are the main contributions to the measured current. At larger timescales (above 1 s) a nonzero quasi steady-state current at high voltages (above 0.5 V) remains. This indicates that besides drift and diffusion an additional process occurs. The dependence of the quasi steady-state current on the applied voltage, micelle concentration, and device thickness has been investigated. Experimental results have been compared to simulations and analytical calculations. It is concluded that the quasi steady-state current results from a bulk disproportionation reaction between neutral micelles that generates charged micelles. And therefore this technique allows for direct quantification of the reaction kinetics from which the charged species originate.
非水介质中的带电物种仍存在许多问题。近期的研究和应用表明，需要更好地理解这些带电物种的起源和性质。瞬态电流测量已被用于研究含有带电反胶束的非水液体的导电性。在短时间尺度（1 - 100毫秒）下，带电物种的漂移和扩散是测量电流的主要贡献因素。在较长时间尺度（超过1秒）下，在高电压（超过0.5伏）时仍存在非零的准稳态电流。这表明除了漂移和扩散外，还发生了一个额外的过程。已经研究了准稳态电流对施加电压、胶束浓度和器件厚度的依赖性。实验结果已与模拟和解析计算进行了比较。得出的结论是，准稳态电流源于中性胶束之间的本体歧化反应，该反应产生带电胶束。因此，这种技术允许直接量化产生带电物种的反应动力学。
