3D shape evolution of microparticles and 3D enabled applications using non-uniform UV flow lithography (NUFL)

Area of Science:

• Materials Science
• Microfluidics
• Biotechnology

Background:

• Non-spherical microparticles offer enhanced properties for clinical and industrial uses.
• Stop flow lithography (SFL) demonstrated 3D particle fabrication via UV intensity manipulation.
• Existing methods for 3D microstructures are often complex and multi-step.

Purpose of the Study:

• To explore non-uniform flow lithography (NUFL) for 3D magnetic microparticle generation and shape control.
• To investigate the potential applications of NUFL-fabricated microparticles.
• To establish NUFL as a facile method for creating 3D microstructure platforms.

Main Methods:

• Utilized a flow lithographic technique (NUFL) in a 2D microfluidic channel.
• Manipulated UV intensity profiles to control particle morphology.
• Varied polymerization objective, UV intensity, and solution opacity to characterize shape changes.
• Coupled magnetic properties with external magnetic fields to assemble microstructures.

Main Results:

• Successfully generated 3D magnetic microparticles with tunable shapes (bullet, bell).
• Demonstrated the creation of particle chains and a valve-like micromachine using magnetic properties.
• Showcased NUFL's ability to create 3D microneedles with modifiable tip morphology.
• Characterized microparticle shape changes based on fabrication parameters.

Conclusions:

• NUFL provides a simple and versatile method for fabricating 3D microparticles and microstructures.
• The technique allows for precise control over particle morphology and assembly.
• NUFL holds significant potential for advancements in micromachine systems and medical interventions.