| Surface Dissociation Properties of Short Chain Carboxyl Mercaptan Self-Assembled Monolayers by Impedance Titration |
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| 作者姓名： | LIU Chuanyin HU Junfu LU Guanghan |
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| 作者单位： | [1]Department of Chemistry, Yunyang Teachers College, Danjiangkou 442700, Hubei, China [2]College of Chemistry, Huazhong Normal University, Wuhan 430079, Hubei, China |
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| 基金项目： | Supported by the Natural Science Project of Hubei Provincial Department of Education （2005D6002） |
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| 摘 要： | Impedance titration was used to determine the surface dissociation characteristics of short-chain carboxyl mercaptan self-assembled monolayers （SAMs）. Based on the change of the cyclic voltammetric peak current and the charge-transfer resistance, which was related to pH value of the solution, the surface pKa of mercaptoacetic acid（MA）, 3-mercaptopropionic acid（MPA） and ω-mercaptohexanic acid（MHA） self-assembled membranes, with ionic strength being 0.1 mol/L, were determined to be 5.20, 4.80, 7.40, respectively. In addition, factors such as time needed for assembling, structure of monolayers and ionic strength, which effected the surface pKa, were studied as well. Such surface pKa shifts were sufficiently explained by interactions between interfacial molecules and hydrophobicity.
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| 关 键 词： | 短链 羧基硫醇 自组装单层 表面离解性质 电位滴定法 |
| 文章编号： | 1007-1202（2007）03-0522-07 |
| 收稿时间： | 27 August 2006 |
| 修稿时间： | 2006-08-27 |
Surface dissociation properties of short chain carboxyl mercaptan self-assembled monolayers by impedance titration |
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| LIU Chuanyin HU Junfu LU Guanghan.Surface Dissociation Properties of Short Chain Carboxyl Mercaptan Self-Assembled Monolayers by Impedance Titration[J].Wuhan University Journal of Natural Sciences,2007,12(3):522-528. |
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| Authors: | Liu Chuanyin Hu Junfu Lu Guanghan |
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| Institution: | (1) Department of Chemistry, Yunyang Teachers College, Danjiangkou, 442700, Hubei, China;(2) College of Chemistry, Huazhong Normal University, Wuhan, 430079, Hubei, China |
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| Abstract: | Impedance titration was used to determine the surface dissociation characteristics of short-chain carboxyl mercaptan self-assembled
monolayers (SAMs). Based on the change of the cyclic voltammetric peak current and the charge-transfer resistance, which was
related to pH value of the solution, the surface pKα of mercaptoacetic acid(MA), 3-mercaptopropionic acid(MPA) and ω-mercaptohexanic acid(MHA) self-assembled membranes, with ionic strength being 0.1 mol/L, were determined to be 5.20, 4.80,
7.40, respectively. In addition, factors such as time needed for assembling, structure of monolayers and ionic strength, which
effected the surface pKα, were studied as well. Such surface pKα shifts were sufficiently explained by interactions between interfacial molecules and hydrophobicity.
Biography: LIU Chuanyin (1970–), male, Associate professor, research direction: electrochemistry and electroanalytical chemistry, modern
instrumental analysis in single-cell analysis. |
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| Keywords: | impedance titration surface pKα self-assembled monolayers mercaptoacetic acid(MA) 3-mercaptopropionic acid (MPA) ω -mercaptohexanic acid(MHA) |
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