Monolithic microfabricated valves and pumps by multilayer soft lithography

Area of Science:

• Microfluidics
• Materials Science
• Biotechnology

Background:

• Soft lithography offers an alternative to silicon-based micromachining for fabricating microfluidic devices.
• Existing soft lithography techniques are limited in creating complex, multi-layered structures.

Purpose of the Study:

• To introduce and demonstrate multilayer soft lithography for fabricating advanced microfluidic systems.
• To showcase the creation of active microfluidic components using elastomer-based multilayer soft lithography.

Main Methods:

• Utilized replica molding with elastomeric materials to create stamps and microfluidic channels.
• Developed a multilayer approach to stack soft materials for intricate device fabrication.
• Integrated active components like valves and pumps within the microfluidic devices.

Main Results:

• Successfully fabricated microfluidic devices with multiple layers using the novel technique.
• Demonstrated the functionality of integrated on-off valves, switching valves, and pumps made entirely of elastomer.
• Achieved significant size reduction (over two orders of magnitude) compared to silicon-based devices.

Conclusions:

• Multilayer soft lithography is a powerful extension of soft lithography for creating complex microfluidic systems.
• This technique allows for miniaturized, active microfluidic devices with retained advantages like rapid prototyping and biocompatibility.