Electrochemical measurements of anisotropic diffusion in thin lyotropic liquid crystal films using interdigitated array electrodes
Electrochemical measurements of anisotropic diffusion in thin lyotropic liquid crystal films using interdigitated array electrodes
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使用叉指阵列电极电化学测量溶致液晶薄膜中的各向异性扩散
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
R. Murray
中科院分区：
文献类型：
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作者：
Chun‐hsien Chen;T. Postlethwaite;J. Hutchison;E. Samulski;R. Murray
本文介绍了叉指阵列（IDA）电极在溶致液晶薄膜电化学探针扩散测量中的一种新应用。该液晶是32%（w/w）的4-反式-正戊基环己酸锂（Li 5CH）在水中的溶液，其可以制备为厚度小于约100 μ m的良好有序的膜。12 {mu}m。电化学探针的表观扩散系数（D{sub APP}）由发生器/集电极伏安图的稳态电流计算。平行和垂直于液晶指向矢测量的扩散各向异性随着探针疏水性的增加而增加。提出了一个简化的模型来解释疏水探针在有序膜中的扩散各向异性。液晶的转变温度由1，1 {prime}-二甲基二茂铁的D{sub APP}的活化曲线确定。参考文献32篇，图6，1个选项卡。
A new application of interdigitated array (IDA) electrodes is described for diffusion measurements of electrochemical probes dissolved in thin, lyotropic liquid crystalline films. The liquid crystal is a solution of 32% (w/w) lithium 4-trans-n-pentyl cyclohexanoate (Li5CH) in water, which can be prepared as well-ordered films of thickness less than ca. 12 {mu}m. Apparent diffusion coefficients (D{sub APP}) of the electrochemical probes are calculated from steady-state currents of generator/collector voltammograms. The diffusional anisotropy, measured parallel and perpendicular to the liquid crystal director, increases with increasing hydrophobicity of the probes. A simplified model has been developed to explain the diffusional anisotropy of hydrophobic probes in the ordered film. The transition temperature of the liquid crystal is determined from an activation plot of D{sub APP} for 1,1{prime}-dimethylferrocene. 32 refs., 6 figs., 1 tab.