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Polymer-Assisted 3D Printing of Inductor Cores. | LitMetric

Polymer-Assisted 3D Printing of Inductor Cores.

ACS Appl Mater Interfaces

Department of Materials, School of Natural Sciences, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.

Published: February 2024

AI Article Synopsis

  • A study investigated using poly(glycerol monomethacrylate) (PGMA) as an additive for 3D printable inks with high concentrations of iron oxide nanoparticles (IOPs), optimizing ink formulation to 70% IOPs and 0.25% PGMA at pH 10.
  • The created inks were successfully printed into various shapes and structures, with the mechanical properties of the printed items improving through sintering at higher temperatures, leading to better particle size and microstructure.
  • Lastly, the performance of printed inductors was evaluated through impedance spectroscopy, revealing a balance between electrical properties and sintering temperature, with optimized devices outperforming previous inductors with iron oxide cores.

Article Abstract

Poly(glycerol monomethacrylate) (PGMA) prepared by reversible addition-fragmentation chain transfer polymerization was investigated as an additive for high-loading iron oxide nanoparticle (IOP) 3D printable inks. The effect of adjusting the molar mass and loading of PGMA on the rheology of IOP suspensions was investigated, and an optimized ink formulation containing 70% w/w IOPs and 0.25% w/w PGMA at pH 10 was developed. This ink was successfully 3D printed onto various substrates and into several structures, including rectangles, high aspect ratio cylinders, letters, spiral- and comb-shaped structures, and thin- and thick-walled toroids. The effect of sintering on the mechanical properties of printed artifacts was investigated via four-point flexural and compressive testing, with higher sintering temperatures resulting in improved mechanical properties due to changes in the particle size and microstructure. The printed toroids were fabricated into inductors, and their electrical performance was assessed via impedance spectroscopy at a working frequency range of 0.001-13 MHz. There was a clear trade-off between electrical properties and sintering temperature due to a phase change between γ-FeO and α-FeO upon heating. Nevertheless, the optimized devices had a factor of ∼40 at 10 MHz, representing a superior performance compared to that of other inductors with iron oxide cores previously reported. Thus, this report represents a significant step toward the development of low-cost, fully aqueous, high loading, and 3D printable ceramic inks for high-performance inductors and functional devices.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10910495PMC
http://dx.doi.org/10.1021/acsami.3c18956DOI Listing

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