Viscous drag measurements utilizing microfabricated cantilevers

Applied Physics Letters

Volumn 68, Issue 26, 1996, Pages 3814-3816

  Oden, P I ^a   Chen, G Y ^a   Steele, R A ^a   Warmack, R J ^a   Thundat, T ^a  

^a OAK RIDGE NATIONAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000871675     PISSN: 00036951     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.116626     Document Type: Article

References (25)

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18. Photodetector ''A'' using Digital Instruments labeling scheme for the Bioscope.
19. Model SR760, Stanford Research Systems, Sunnyvale, CA. It should be noted that there is a 100 kHz bandwidth of this instrument, and therefore, it was necessary to choose cantilevers that have a resonance response peak in this frequency range for the desired viscous medium. One lever in this study had a resonance response peak in air of 106 kHz (outside the bandwidth of the FFT system), but typically, there is a factor of 3-4 decrease in this frequency when placed in pure water allowing for liquid measurements with this lever.
20. As an example, for the MESP Magnetic Bar cantilever, a sensitivity of 139.99 nm/V was found for the ''A'' segment of the Bioscopes split photodetector in solution and a sensitivity of 243.49 nm/V for the air calibration. The dramatic differences in these calibration sensitivities is due to the variation in the index of refraction at the interface between the glass confinement cell and either air or solution. This difference results in an enhancement of the deflection angles of the reflected laser beam off the cantilever in the case of water compared to air.
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22. Note: Strictly speaking, resonance frequency is for a system in vacuum conditions (i.e., without a drag term in the differential equation). When a viscous drag or damping is added to the systems, then the response amplitude maximum for the system can be referred to as the peak resonance response.
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