Abstract
A micromachined vibrating membrane is used to remove adsorbed proteins on a surface. A lead zirconate titanate (PZT) composite (3 × 1 × 0.5 mm) is attached to a silicon membrane (2,000 × 500 × 3 μm) and vibrates in a flexural plate wave (FPW) mode with wavelength of 4,000/3 μm at a resonant frequency of 308 kHz. The surface charge on the membrane and fluid shear stress contribute in minimizing the protein adsorption on the SiO2 surface. In vitro characterization shows that 57 ± 10% of the adsorbed bovine serum albumin (BSA), 47 ± 13% of the immunoglobulin G (IgG), and 55.3~59.2 ± 8% of the proteins from blood plasma are effectively removed from the vibrating surface. A simulation study of the vibration-frequency spectrum and vibrating amplitude distribution matches well with the experimental data. Potentially, a microelectromechanical system (MEMS)-based vibrating membrane could be the tool to minimize biofouling of in vivo MEMS devices.
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Acknowledgement
This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), Canada Foundation for Innovation (CFI). Dr. Chiao is supported by Canada Research Chair, Tier 2 program. J.N.K. is the recipient of a CBS/CIHR new investigator award in transfusion science.
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Yeh, P.Y., Le, Y., Kizhakkedathu, J.N. et al. An investigation of vibration-induced protein desorption mechanism using a micromachined membrane and PZT plate. Biomed Microdevices 10, 701–708 (2008). https://doi.org/10.1007/s10544-008-9181-8
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DOI: https://doi.org/10.1007/s10544-008-9181-8