Continuous Nanoparticle Patterning Strategy in Layer‐Structured Nanocomposite Fibers

Abstract

Anisotropic polymer/nanoparticle composites display unique mechanical, thermal, electrical, and optical properties depending on confirmation and configuration control of the composing elements. Processes, such as vapor deposition, ice-templating, nanoparticle self-assembly, additive manufacturing, or layer-by-layer casting, are explored to design and control nanoparticle microstructures with desired anisotropy or isotropy. However, limited attempts are made toward nanoparticle patterning during continuous fiber spinning due to the thin-diameter cross section and 1D features. Thus, this research focuses on a new patterning technique to form ordered nanoparticle assembly in layered composite fibers. As a result, distinct layers can be retained with innovative tool design, unique material combinations, and precise rheology control during fiber spinning. The layer multiplyingenabled nanoparticle patterning is demonstrated in a few material systems, including polyvinyl alcohol (PVA)-boron nitride (BN)/PVA, polyacrylonitrile (PAN)-aluminum (Al)/PAN, and PVA-BN/graphene nanoplatelet (GNP)/ PVA systems. This approach demonstrates an unprecedentedly reported fiber manufacturing platform for well-managed layer dimensions and nanoparticle manipulations with directional thermal and electrical properties that can be utilized in broad applications, including structural supports, heat exchangers, electrical conductors, sensors, actuators, and soft robotics.

A multimaterial 3D printing-assisted micropatterning for heat dissipation applications

“…1a were modi ed from our previous publications. [39][40][41] The printer components were fabricated via a metal 3D printer, Concept Laser M2 (GE additive), with metallic powders of Inconel 718 to be mechanically robust and corrosion-resistant during printing. The E-BN25 and PEI heated at a temperature of 50°C (PEI-T50, Table 1) for matching uid dynamics were loaded into separated stainless-steel syringes and dispensed using syringe pumps (KDS LEGATO 200) at the same ow rate of 1.5 ml/min.…”

“…Once the polymer inks entered different spinneret channels, the minimizer would reduce the ow area for the potential bene ts of increasing shear rates, aligning polymer chains/nanoparticles, and maximizing the printing resolution. [31,[41][42][43] The initial two polymer inks forming two-layer structures in the spinneret would ow through the several layer multipliers, producing from tens to hundreds of individual sublayers within a single printing line. In each layer multipliers, the polymer ink was cut horizontally into two parts, where one part ew and spread into the top channel, and the other part ew and spread into a bottom channel, followed by stacking (Fig.…”

Coaxial Layered Fiber Spinning for Wind Turbine Blade Recycling

“…To obtain synergistic and hybrid properties, a combination of particle fillers and polymer matrices is used. This strategy is particularly valuable for creating composites with isotropic properties. , Such composite fibers, incorporating particles, offer improved characteristics largely due to their high surface-to-volume ratio and compatibility with the matrix. One of the major challenges in preparing excellent composite fibers is achieving uniform dispersion of particles within the polymer matrix.…”

Ink-Based Additive Manufacturing of a Polymer/Coal Composite: A Non-Traditional Reinforcement

“…DIW excels in constructing structures with intricate geometries, showcasing proficiency in creating overhangs and internal voids. This capability makes it particularly suitable for generating specialized structures such as lattices, interwoven designs, or meta-structures, especially in biomedical applications. − …”