| 阻抗滴定法测定巯基乙酸及其混合自组装膜表面酸度 |
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| 引用本文： | 刘传银,姜灵彦,郑第,李业梅,陆光汉.阻抗滴定法测定巯基乙酸及其混合自组装膜表面酸度[J].分析化学,2005,33(8):1171-1174. |
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| 作者姓名： | 刘传银 姜灵彦 郑第 李业梅 陆光汉 |
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| 作者单位： | 郧阳师范高等专科学校化学系,丹江口,442700;华中师范大学化学学院,武汉,430079;华中师范大学化学学院,武汉,430079;郧阳师范高等专科学校化学系,丹江口,442700 |
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| 摘 要： | 采用循环伏安和交流阻抗法对巯基乙酸及其混合自组装膜的表面酸性基团的离解特性进行了研究，并利用阻抗滴定曲线得出了巯基乙酸及其混合自组装膜的表面酸度。研究了混合组装电极中其他组分含量的变化、支持电解质的离子强度等因素对表面酸度移动的影响，用氢键作用、疏水相互作用及分子间相互作用对实验结果进行了解释。
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| 关 键 词： | 交流阻抗滴定 巯基乙酸 自组装膜 表面酸度 |
| 收稿时间： | 06 9 2004 12:00AM |
| 修稿时间： | 2004-06-09 |
Determination of Surface pKa of Pure and Mixed Mercaptoacetic Acid Self-assembled Monolayers by Impedance Titration |
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| Liu Chuanyin,Jiang Lingyan,ZHENG Di,Li Yemei,Lu Guanghan.Determination of Surface pKa of Pure and Mixed Mercaptoacetic Acid Self-assembled Monolayers by Impedance Titration[J].Chinese Journal of Analytical Chemistry,2005,33(8):1171-1174. |
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| Authors: | Liu Chuanyin Jiang Lingyan ZHENG Di Li Yemei Lu Guanghan |
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| Abstract: | The dissociation properties of acidic group on pure and mixed mercaptoacetic acid self-assembled monolayers (SAMs) were investigated by cyclic voltammetry and alternating current impedance. The surface pK_a was obtained from the impedance titration curves. The effects of composition of SAMs and ionic strength on the acidic dissociation properties of SAMs have also been studied. The mechanism of the influence was (explained) by hydrogen bonding, hydrophobicity and intermolecular interactions. |
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| Keywords: | Alternating current impedance titration mercaptoacetic acid self-assembled monolayers surface acidity |
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