| Conformational Transition of Poly （Acrylic Acid） Detected by Microcantilever Sensing |
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| 引用本文： | 李凯,刘红,张青川,薛长国,伍小平.Conformational Transition of Poly （Acrylic Acid） Detected by Microcantilever Sensing[J].中国物理快报,2007,24(6):1502-1504. |
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| 作者姓名： | 李凯 刘红 张青川 薛长国 伍小平 |
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| 作者单位： | [1]CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027 [2]Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 20674078, 10627201, 10472111 and 10472112, and the Doctorial Programme of the Ministry of Education of China under Grant No 20040358027. |
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| 摘 要： | Poly （acrylic acid） （PAA） chains are grafted on one side of a microcantilever by the self-assembled method and the deflections of the microcantilever are detected as a function of medium pH from 3 to 11. It is found that when the pH varies, the microcantilever deflects because of the changing surface stress. By analysing the electrostatic repulsive effect, the surface stress change is related to the conformation transition of PAA from a collapse state to a swelling state. This method offers the interaction information among the polymer chains during the conformational transition and affords an alternative way to study conformational change of polymers.
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| 关 键 词： | 聚乙烯 偏转 介质 聚合物 |
| 收稿时间： | 2006-9-12 |
| 修稿时间： | 2006-09-12 |
Conformational Transition of Poly (Acrylic Acid) Detected by Microcantilever Sensing |
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| LI Kai,LIU Hong,ZHANG Qing-Chuan,XUE Chang-Guo,WU Xiao-Ping.Conformational Transition of Poly (Acrylic Acid) Detected by Microcantilever Sensing[J].Chinese Physics Letters,2007,24(6):1502-1504. |
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| Authors: | LI Kai LIU Hong ZHANG Qing-Chuan XUE Chang-Guo WU Xiao-Ping |
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| Affiliation: | 1 CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027 |
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| Abstract: | Poly (acrylic acid) (PAA) chains are grafted on one side of a microcantilever by the self-assembled method and the deflections of the microcantilever are detected as a function of medium pH from 3 to 11. It is found that when the pH varies, the microcantilever deflects because of the changing surface stress. By analysing the electrostatic repulsive effect, the surface stress change is related to the conformation transition of PAA from a collapse state to a swelling state. This method offers the interaction information among the polymer chains during the conformational transition and affords an alternativeway to study conformational change of polymers. |
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| Keywords: | 07 10 Cm 07 07 Df 36 20 Ey |
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