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MEMS Electrostatic Actuation in Conducting Biological Media.

Vikram Mukundan1, Beth L Pruitt

  • 1Mechanical Engineering Department, Stanford University, Stanford, CA 94305 USA.

Journal of Microelectromechanical Systems : a Joint IEEE and ASME Publication on Microstructures, Microactuators, Microsensors, and Microsystems
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We developed high-frequency electrostatic comb-drive actuators for biological applications. These micro-actuators precisely measure cell stiffness in conductive solutions, advancing cell mechanics research.

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Area of Science:

  • Biomedical Engineering
  • Microelectromechanical Systems (MEMS)
  • Cell Mechanics

Background:

  • Electrostatic comb-drive actuators are crucial for microscale manipulation.
  • High-conductivity solutions, like biological media, pose challenges for actuator performance due to parasitic impedances and electric double-layer effects.
  • Accurate measurement of cell mechanical properties is vital for understanding cellular function and disease.

Purpose of the Study:

  • To design and experimentally implement electrostatic comb-drive actuators for operation in high-conductivity biological solutions.
  • To investigate actuator performance at high frequencies (1-10 MHz) and varying ionic strengths.
  • To integrate the actuators into a system for measuring the stiffness of cultured cells.

Main Methods:

  • Fabrication of electrostatic comb-drive actuators.
  • Testing actuator performance in ionic and cell culture media (up to 150 mMol/L).
  • Characterization of frequency dependence and displacement (3.5 microm at 5V peak-to-peak).
  • Utilizing circuit models of electric double-layer phenomena.
  • Integration into a planar force sensing system.

Main Results:

  • Successful operation of comb-drive actuators in high-conductivity media at 1-10 MHz.
  • Demonstration of a differential drive design to mitigate impedance losses.
  • Characterization of electrostatic force frequency dependence in different ionic strengths.
  • Achieved typical displacement of 3.5 micrometers with a 5V peak-to-peak signal.
  • Successful integration into a force sensing system for cell stiffness measurement.

Conclusions:

  • Electrostatic comb-drive actuators can be effectively implemented in high-conductivity biological media at high frequencies.
  • Differential drive designs enhance actuator performance by overcoming parasitic impedance losses.
  • The developed system provides a novel platform for precise, microscale measurement of cell mechanical properties, particularly cell stiffness.