Atomic force microscope based biomolecular force-clamp measurements using a micromachined electrostatic actuator.

Atomic force microscope based biomolecular force-clamp measurements using a micromachined electrostatic actuator.
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DOI:
10.1016/j.ultramic.2012.07.023
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发表时间:
2012-11
期刊:
影响因子:
2.2
通讯作者:
Degertekin, F. Levent
Degertekin, F. Levent
中科院分区:
工程技术3区
文献类型:
--
作者:
Torun, Hamdi;Finkler, Ofer;Degertekin, F. Levent

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The authors describe a method for biomolecular force clamp measurements using atomic force microscope (AFM) cantilevers and micromachined membrane-based electrostatic actuators. The actuators comprise of Parylene membranes with embedded side actuation electrodes and are fabricated on a silicon substrate. The devices have a displacement range of 1.8 μm with 200 V actuation voltage, and displacement uncertainty is 0.8 nm, including the noise and drift. The settling time, limited by the particular amplifier is 5 ms, with an inherent range down to 20 μs. A force clamp measurement setup using these actuators in a feedback loop has been used to measure bond life-times between human IgG and anti-human IgG molecules to demonstrate the feasibility of this method for biological experiments. The experimental findings are compared with a molecular pulling experiment and the results are found to be in good agreement.
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