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Shape Memory Polymers for Active Cell Culture
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Latchable microfluidic valve arrays based on shape memory polymer actuators.

Bekir Aksoy1, Nadine Besse, Robert Jan Boom

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Summary
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Shape memory polymer microfluidic valves offer permanent, zero-power latching and over 3000 cycles. These valves function as reagent mixers and peristaltic pumps for microfluidic large scale integration.

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Area of Science:

  • Materials Science
  • Microfluidics
  • Polymer Science

Background:

  • Microfluidic systems require precise control of fluid flow.
  • Traditional microfluidic valves often need continuous power or complex external systems.
  • Shape memory polymers (SMPs) offer unique thermal and mechanical properties for advanced applications.

Purpose of the Study:

  • To develop and characterize novel latching microfluidic valves utilizing shape memory polymers (SMPs).
  • To demonstrate the application of these valves in reagent mixing and peristaltic pumping.
  • To enable microfluidic large scale integration (mLSI) with reduced footprint and complexity.

Main Methods:

  • Fabrication of a tri-layer valve structure comprising an SMP core, carbon-silicone (CB/PDMS) heaters, and a styrene ethylene butylene styrene (SEBS) film.
  • Utilizing the SMP's dual-stable shape and temperature-dependent stiffness for latching functionality.
  • Implementing localized Joule heating for individual valve addressability and control.
  • Testing valve performance for zero-power latching duration and cyclic operation stability.

Main Results:

  • Achieved permanent zero-power latching in both open and closed states for over 15 hours.
  • Demonstrated extended cyclic operation exceeding 3000 cycles.
  • Successfully applied the valves as reagent mixers and peristaltic pumps.
  • Validated individual addressability of valves through synchronized Joule heating and external pressure.

Conclusions:

  • SMP-based microfluidic valves provide robust, energy-efficient latching and reliable cyclic operation.
  • The developed valve architecture is suitable for reagent mixing and pumping in microfluidic devices.
  • This technology significantly advances microfluidic large scale integration (mLSI) by reducing device size and eliminating multiplexing needs.