Thermally driven microfluidic pumping via reversible shape memory polymers
| Autor: | Eric D. Wetzel, R.X. Rodriguez, Patrick T. Mather, Larry R. Holmes, Jaimee M. Robertson |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Microfluidics 02 engineering and technology Temperature cycling 010402 general chemistry 01 natural sciences law.invention law Thermal Lamination Electronic engineering Fluid dynamics General Materials Science Electrical and Electronic Engineering Civil and Structural Engineering business.industry 021001 nanoscience & nanotechnology Condensed Matter Physics Ray Atomic and Molecular Physics and Optics 0104 chemical sciences Shape-memory polymer Mechanics of Materials Signal Processing Optoelectronics 0210 nano-technology business Layer (electronics) |
| Zdroj: | Smart Materials and Structures. 25:085043 |
| ISSN: | 1361-665X 0964-1726 |
| DOI: | 10.1088/0964-1726/25/8/085043 |
| Popis: | The need exists for autonomous microfluidic pumping systems that utilize environmental cues to transport fluid within a network of channels for such purposes as heat distribution, self-healing, or optical reconfiguration. Here, we report on reversible thermally driven microfluidic pumping enabled by two-way shape memory polymers. After developing a suitable shape memory polymer (SMP) through variation in the crosslink density, thin and flexible microfluidic devices were constructed by lamination of plastic films with channels defined by laser-cutting of double-sided adhesive film. SMP blisters integrated into the devices provide thermally driven pumping, while opposing elastic blisters are used to generate backpressure for reversible operation. Thermal cycling of the device was found to drive reversible fluid flow: upon heating to 60 °C, the SMP rapidly contracted to fill the surface channels with a transparent fluid, and upon cooling to 8 °C the flow reversed and the channel re-filled with black ink. Combined with a metallized backing layer, this device results in refection of incident light at high temperatures and absorption of light (at the portions covered with channels) at low temperatures. We discuss power-free, autonomous applications ranging from thermal regulation of structures to thermal indication via color change. |
| Databáze: | OpenAIRE |
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