Biocompatible PVDF Nanofibers with Embedded Magnetite Nanodiscs Enable Wireless Magnetoelectric Stimulation in...

Area of Science:

• Biomaterials Science
• Neuroscience
• Materials Engineering

Background:

• Wireless neuromodulation seeks to overcome limitations of invasive hardware and improve tissue compatibility.
• Magnetoelectric (ME) materials offer magnetic field-induced electrical stimulation for minimally invasive neural activation.
• Existing ME systems often use rigid, ceramic components with poor biocompatibility.

Purpose of the Study:

• To develop a flexible, biocompatible, and predominantly organic ME platform for wireless neuromodulation.
• To investigate the efficacy of different magnetic activation strategies (torque vs. magnetostriction) for neural stimulation.
• To demonstrate the potential of this new ME platform for modulating neural activity and motor behavior in vivo.

Main Methods:

• Fabrication of flexible ME fibers using polyvinylidene fluoride (PVDF) nanofibers embedded with anisotropic magnetite nanodiscs (MNDs).
• Characterization of the magnetoelectric voltage coefficient and preservation of the PVDF piezoelectric β-phase.
• In vitro neuronal activation assessment using calcium imaging and in vivo studies in mice involving motor behavior modulation.

Main Results:

• The developed ME fibers exhibited a magnetoelectric voltage coefficient of 1.26 Vcm^-1Oe^-1.
• High-frequency magnetostriction proved more effective than torque-based activation in triggering neuronal responses.
• In vitro and in vivo experiments demonstrated robust neural activation, biocompatibility, and wireless modulation of motor behavior.

Conclusions:

• This study presents the first wireless magnetoelectric neuromodulation using soft, biocompatible fiber composites.
• The flexible ME fibers offer a promising alternative to rigid bioelectronic interfaces.
• This technology paves the way for advanced, less invasive neural interfaces without tethered systems.