Family Sciences Department, College for Women, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait.
Talanta. 2012 May 30;94:184-8. doi: 10.1016/j.talanta.2012.03.016. Epub 2012 Mar 12.
Two conventional Zn(II) polyvinyl chloride (PVC) membrane electrodes have been prepared and characterized. They were based on dibenzo-24-crown-8 (DBC) as a neutral carrier, dioctyl phthalate (DOP) as a plasticizer, and potassium tetrakis (p-chlorophenyl) borate, KTpClPB or the halogen-free ionic liquid, tetraoctylammonium dodecylbenzene sulfonate [TOA][DBS] as an additive. The use of ionic liquid has been found to enhance the selectivity of the sensor. For each electrode, the surfaces of two membranes were investigated using X-ray photoelectron, ion-scattering spectroscopy and atomic force microscopy. One of the two membranes was conditioned by soaking it for 24 h in a 1.0×10(-3) M Zn(NO(3))(2) solution and the second was soaked in bi-distilled water for the same interval (24 h). Comparing the two surfaces indicated the following: (a) the high selectivity in case of using [TOA][DBS] as an additive is due to the extra mediation caused by the ionic liquid and (b) the working mechanism of the electrode is based on phase equilibrium at the surface of the membrane associated with ion transport through the bulk of the membrane.
已经制备和表征了两种基于二苯并-24-冠-8（DBC）作为中性载体、邻苯二甲酸二辛酯（DOP）作为增塑剂、以及四（对氯苯基）硼酸钾（KTpClPB）或无卤离子液体四辛基铵十二烷基苯磺酸盐 [TOA][DBS]作为添加剂的常规 Zn(II)聚氯乙烯（PVC）膜电极。发现使用离子液体可以提高传感器的选择性。对于每个电极，使用 X 射线光电子、离子散射光谱和原子力显微镜研究了两个膜的表面。将其中一个膜在 1.0×10(-3) M Zn(NO(3))(2)溶液中浸泡 24 小时，另一个膜在双蒸水中浸泡相同的时间（24 小时）来进行预处理。比较两个表面表明：(a) 使用 [TOA][DBS] 作为添加剂具有高选择性是由于离子液体引起的额外介导作用，(b) 电极的工作机制基于与离子通过膜本体传输相关的膜表面的相平衡。
