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Conformational Transition of Poly (Acrylic Acid) Detected by Microcantilever Sensing |
| LI Kai1;LIU Hong2;ZHANG Qing-Chuan1;XUE Chang-Guo1;WU Xiao-Ping1 |
| 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 2300272Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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LI Kai, LIU Hong, ZHANG Qing-Chuan et al 2007 Chin. Phys. Lett. 24 1502-1504 |
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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 alternative
way to study conformational change of polymers.
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| Keywords:
07.10.Cm
07.07.Df
36.20.Ey
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Received: 12 September 2006
Published: 17 May 2007
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| PACS: |
07.10.Cm
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(Micromechanical devices and systems)
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07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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36.20.Ey
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(Conformation (statistics and dynamics))
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