Step response measurement of AFM cantilever for analysis of frequency-resolved viscoelasticity |
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Authors: | Tatsuya Ogawa Shinkichi KurachiMasami Kageshima Yoshitaka NaitohYan Jun Li Yasuhiro Sugawara |
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Affiliation: | Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan |
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Abstract: | Extension of AFM-based viscoelasticity measurement into a frequency-resolved analysis is attempted. A cantilever immersed into and interacting with distilled water was employed for the trial system. Using a home-built wideband magnetic excitation AFM, a step force with a transient time less than 1 μs is applied to the AFM cantilever and its deflection is measured. The 1st and 2nd mode resonance ringing of the cantilever was suppressed using quality-factor-control technique, so that the measurement system becomes equivalent to driving a resonance-free virtual cantilever within the bandwidth limited by the surviving 3rd mode resonance. From the obtained response of the cantilever deflection, a frequency-dependent complex compliance of the cantilever-water system was derived in a frequency range of 1–100 kHz. Effect of water confining between the tip and a mica substrate is discussed. |
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Keywords: | Atomic force microscopy Soft matter Viscoelasticity Water Step response Magnetic force |
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