Microfluidic Processing of Piezoelectric and Magnetic Responsive Electroactive Microspheres.

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Poly(vinylidene fluoride) (PVDF) and cobalt ferrite (CFO) form effective magnetoelectric composites.
• Achieving the electroactive phase in PVDF is crucial for its properties.
• Microfluidics offers efficient and reproducible methods for creating nanocomposite structures.

Purpose of the Study:

• To develop a one-step method for producing magnetoelectric microspheres using microfluidics.
• To create PVDF-CFO microspheres with high electroactive phase content and good CFO dispersion.
• To evaluate the suitability of these microspheres for tissue regeneration and piezoelectric applications.

Main Methods:

• Fabrication of a flow-focusing polydimethylsiloxane device using 3D printed polylactic acid.
• One-step microfluidic production of PVDF and PVDF-CFO microspheres.
• Characterization of microsphere size, morphology, CFO distribution, encapsulation efficacy, and PVDF phase content.

Main Results:

• Spherical microspheres with diameters ranging from 80 to 330 μm were produced.
• Microspheres exhibited internal/external cavernous structures and good CFO distribution (80% encapsulation efficacy).
• The PVDF was confirmed to be in the electroactive γ-phase with a mean content of 75%.

Conclusions:

• The microfluidic approach enables efficient, one-step production of magnetoelectric PVDF-CFO microspheres.
• The produced microspheres possess desirable characteristics for tissue regeneration and other piezoelectric applications.
• This method offers a scalable and reproducible route for advanced functional materials.