Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 12, Issue 1, Pages 16-22Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/12/1/302
Keywords
surface forces apparatus; capacitive sensor; nanorheology
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We present a new capacitive sensor for displacement measurement in a surface-force apparatus which allows dynamical measurements in the range 0-100 Hz. This sensor measures the relative displacement between two macroscopic opaque surfaces over periods of time ranging from milliseconds to, in principle, an indefinite period, at a very low price and down to atomic resolution. It consists of a plane capacitor, a high frequency oscillator and a high sensitivity frequency-to-voltage converter. We use this sensor to study the nanorheological properties of dodecane confined between glass surfaces.
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