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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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Related Experiment Video

Updated: Aug 8, 2025

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs
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Programmable UV-Curable Resin by Dielectric Force.

Yi-Wei Lin1,2, Chang-Yi Chen2, Ying-Fang Chang2

  • 1Institute of NanoEngineering and Microsystem, National Tsing Hua University, Hsinchu 30013, Taiwan.

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|February 25, 2023
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Summary

Researchers precisely patterned UV-curable resin using dielectric force, finding current and AC frequency critical for controlling droplet size and line width for microfabrication.

Keywords:
UV curable resindielectric forceprogrammable UV resin

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Area of Science:

  • Materials Science and Engineering
  • Microfabrication
  • Dielectrophoresis

Background:

  • Dielectric force, generated by dielectric chips with interdigitated electrodes, is a key mechanism in microfluidic manipulation.
  • Precise control over material patterning is essential for creating micro-scale structures and devices.

Purpose of the Study:

  • To investigate the programmable control of dielectric force for patterning UV-curable resin.
  • To determine the influence of electrical parameters (current, voltage, frequency) on resin patterning.
  • To demonstrate the fabrication of micro-structural parts using this method.

Main Methods:

  • UV-curable resin was patterned using programmable dielectric force generated by interdigitated electrodes.
  • Electrical parameters including current (0.1-0.5 A), voltage (100-300 V), and AC electric field frequency (10-50 kHz) were systematically varied.
  • The resulting droplet area and pattern line width were measured after UV curing.

Main Results:

  • Current significantly influenced the UV resin driving area, while voltage showed minimal effect.
  • Increasing AC electric field frequency allowed fine control of UV resin pattern line width from 224 µm to 137 µm.
  • Accurate pattern shapes were achieved by controlling current and frequency.

Conclusions:

  • Dielectric force offers a viable method for programmable patterning of UV-curable resins.
  • Current and AC frequency are critical control factors for achieving precise micro-scale patterns.
  • This technique enables the successful fabrication of intricate micro-structural parts.