Active Liquid Aspiration and Dispensing Based on an Expanding PDMS Composite

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Active Liquid Aspiration and Dispensing Based on
an Expanding PDMS Composite

• Bjorn Samel, Patrick Griss and Goran Stemme
• Microsystem Technology Lab, School of Electrical
  Engineering, Royal Institute of Technology,
  Stockholm, Sweden

from MEMS 2007 p565-p568
9533535 ???
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Outline

• Introduction
• Principle of Operation
• Fabrication
• Experiments Results
• Conclusion

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Introduction

• Using polymer to fabricate microfluidic devices
• (1) cheap compare to single-crystalline silicon
• (2) easy to process molding embossing technique
• (3) offer possibility to manipulate physical
  chemical properties

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Introduction PDMS

• PDMS (poly dimethyl siloxane)???????
• (1) fast fabrication time
• (2) compatibility to various of biological
  cellular application
• (3) optical transparency down to 240nm
• (4) nontoxic, rapid prototyping

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Introduction
Pressure-driven
Stimuli-responsive hydrogel
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Principle of Operation

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Fabrication

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Experiments Results
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Experiments Results
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Experiments Results
815nL, s4.9
747nL, s8.7
Outer heater ring diameter is 4.5mm
Outer heater ring diameter is 3mm
180nL, s16.6
162nL, s23.6
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Conclusion

• Single-use
• Control liquid aspiration release ranging from
  180nL to 815nL
• Wafer-level fabrication low-cost
• Transdermal microfluidics application