Intrinsic Field-Induced Nanoparticle Assembly in Three-Dimensional (3D) Printing Polymeric Composites

Area of Science:

• Materials Science and Engineering
• Nanotechnology
• Additive Manufacturing

Background:

• Nanoparticles (NPs) exhibit diverse properties but tend to aggregate, hindering their application potential.
• Achieving stable dispersions and ordered NP assembly remains a significant challenge in materials science.
• Three-dimensional printing (3DP), or additive manufacturing (AM), provides layer-by-layer fabrication of 3D structures.

Purpose of the Study:

• To review 3DP methods for assembling nanoparticles without external fields.
• To focus on shear-field-induced nanoparticle alignment in various 3DP techniques.
• To explore the potential of photopolymerization and optical tweezers for NP confinement.

Main Methods:

• Overview of 3DP techniques including material jetting, electrohydrodynamic, filament melting, and ink writing.
• Discussion of shear-field-induced nanoparticle alignment mechanisms.
• Examination of photopolymerization and optical tweezer effects for NP ordering.

Main Results:

• 3DP enables anisotropic microstructural/nanostructural characteristics for enhanced material properties.
• Shear fields within 3DP processes can induce nanoparticle alignment.
• Photopolymerization offers localized NP confinement, inspiring new assembly strategies.

Conclusions:

• 3DP presents a promising avenue for directed nanoparticle assembly and fabricating advanced polymer/nanoparticle composites.
• Overcoming challenges like resolution and printing speed is key to unlocking 3DP's full potential in NP ordering.
• This review highlights innovative 3DP approaches for creating high-performance nanocomposites.