Centrifugation-Assisted Three-Dimensional Printing of Devices Embedded with Fully Enclosed Microchannels.

Area of Science:

• Microfluidics
• Additive Manufacturing
• Materials Science

Background:

• Removing sacrificial materials from enclosed microfluidic channels is challenging for 3D printing intricate geometries.
• Advancing printer resolution exacerbates etching bottlenecks with current methods.
• Existing techniques struggle with small, densely packed microfeatures.

Purpose of the Study:

• Introduce a novel microfabrication approach using centrifugation for efficient sacrificial material removal.
• Characterize centrifugal etching parameters and develop a predictive theoretical model.
• Demonstrate the method's applicability and advantages over conventional techniques.

Main Methods:

• Utilized centrifugation to remove sacrificial materials from 3D-printed microfluidic devices.
• Measured etch rates under varying centrifugal forces.
• Developed a theoretical model to estimate process parameters for different geometries.
• Investigated the impact of device layout on centrifugal etching.

Main Results:

• Centrifugal etching demonstrated efficient removal of sacrificial materials from complex microfluidic channels.
• Characterization provided etch rate data and a validated theoretical model.
• The method proved effective for inkjet 3D printing and stereolithography fabricated devices.
• Direct comparisons showed advantages over injection-based etching.

Conclusions:

• Centrifugal etching offers a robust solution for postprocessing 3D-printed microfluidic devices with intricate features.
• This approach enables better utilization of 3D printing's high resolution and large volume capabilities.
• Facilitates the creation of diverse microfluidic devices, from scaffolds to large-scale assays.