Direct-Ink-writing of liquid metal-graphene-based polymer composites: Composition-processing-property relationships

[Display omitted] This paper presents a study of the solvent-based precursors (inks) derived from composites of polyethylene oxide, graphene flakes and micro-scale spherical Eutectic Gallium Indium (EGaIn) fillers and their processing through direct-ink-writing (DIW). The presented studies focus on...

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Bibliographic Details
Published in:Journal of materials processing technology 2022-04, Vol.302, p.117470, Article 117470
Main Authors: Tandel, Ruchira, Gozen, B. Arda
Format: Article
Language:English
Subjects:
Conducting polymers
Direct-ink-writing
Elasticity
Electrical conductivity
Electrical resistivity
Filaments
Fillers
Gallium
Graphene
Inks
Liquid metals
Polyethylene oxide
Polymer matrix composites
Rheological properties
Rheology
Viscoelasticity
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Summary:[Display omitted] This paper presents a study of the solvent-based precursors (inks) derived from composites of polyethylene oxide, graphene flakes and micro-scale spherical Eutectic Gallium Indium (EGaIn) fillers and their processing through direct-ink-writing (DIW). The presented studies focus on the influence of EGaIn fillers on ink rheology, DIW process mechanisms as well as electrical conductivity of the printed structures. The results show that EGaIn fillers vary the ink rheology towards a more elastic behavior with lower extensional viscosity. This leads to ink filaments capable of withstanding large extensional strains during DIW, forming continuous prints even when printing speed is higher than ink flow speed, and producing features with line width smaller than the nozzle diameter. Electrical conductivity of the prints reduces with increasing strain due to the deformation of the liquid EGaIn fillers along the printing direction. These findings can be utilized to control the DIW process and the properties of the conductive polymer composites.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2021.117470