Liquid Printing in Nanochitin Suspensions: Interfacial Nanoparticle Assembly Toward Volumetric Elements, Organic...

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Precise control over nanoparticle assembly is crucial for advanced material fabrication.
• Existing methods often lack the ability to create complex, free-standing structures.
• Developing versatile inks and stabilizers is key for innovative printing techniques.

Purpose of the Study:

• To introduce a novel liquid-in-liquid 3D printing approach for nanoparticle-nanoparticle assembly.
• To demonstrate the use of modified chitin nanofibers (mChNF) as a stabilizer in printable inks.
• To explore the fabrication of high-fidelity, mechanically robust 3D structures with tunable properties.

Main Methods:

• Utilizing electrostatic complexation between aqueous graphene oxide (GO) ink and mChNF dispersed in 1-butanol.
• Employing support-free printing by extruding GO ink into a viscoelastic external phase.
• Incorporating various nanoparticles (metal-organic frameworks, cellulose) and conductive polymers into GO inks.
• Inducing osmosis-driven solidification for demolding of 3D structures.

Main Results:

• Formation of a stable, jammed interfacial network for support-free printing.
• Successful printing of inks containing diverse nanoparticles and conductive polymers.
• Fabrication of high-fidelity 3D structures with core-shell morphology and high mechanical strength (∼175 MPa).
• Demonstration of programmable and conductive patterning capabilities.

Conclusions:

• The liquid-in-liquid fabrication approach, stabilized by mChNF, enables versatile and multifunctional material design.
• This method opens new avenues for applications in liquid electronics and reconfigurable systems.
• The ability to create high-strength, complex 3D structures advances the field of additive manufacturing.