Sensors, Vol. 20, Pages 6459: Effect of Surface and Interfacial Tension on the Resonance Frequency of Microfluidic Channel Cantilever

Sensors, Vol. 20, Pages 6459: Effect of Surface and Interfacial Tension on the Resonance Frequency of Microfluidic Channel Cantilever Sensors doi: 10.3390/s20226459 Authors: Rosmi Abraham Faheem Khan Syed A. Bukhari Qingxia Liu Thomas Thundat Hyun-Joong Chung Chun Il Kim The bending resonance of micro-sized resonators has been utilized to study adsorption of analyte molecules in complex fluids of picogram quantity. Traditionally, the analysis to characterize the resonance frequency has focused solely on the mass change, whereas the effect of interfacial tension of the fluid has been largely neglected. By observing forced vibrations of a microfluidic cantilever filled with a series of alkanes using a laser Doppler vibrometer (LDV), we studied the effect of surface and interfacial tension on the resonance frequency. Here, we incorporated the Young–Laplace equation into the Euler–Bernoulli beam theory to consider extra stress that surface and interface tension exerts on the vibration of the cantilever. Based on the hypothesis that the near-surface region of a continuum is subject to the extra stress, thin surface and interface layers are introduced to our model. The thin layer is subject to an axial force exerted by the extra stress, which in turn affects the transverse vibration of the cantilever. We tested the analytical model by varying the interfacial tension between the silicon nitride microchannel cantilever and the filled al...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research
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