3D printing with 2D colloids: designing rheology protocols to predict 'printability' of soft-materials

Corker, Andrew ORCID: 0000-0001-7343-8386, Ng, Henry ORCID: 0000-0003-4926-7622, Poole, Rob ORCID: 0000-0001-6686-4301 and Garcia-Tunon, Esther
(2019) 3D printing with 2D colloids: designing rheology protocols to predict 'printability' of soft-materials. Soft Matter, 15 (6). pp. 1444-1456.

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Additive manufacturing (AM) techniques and so-called 2D materials have undergone an explosive growth in the past decade. The former opens multiple possibilities in the manufacturing of multifunctional complex structures, and the latter on a wide range of applications from energy to water purification. Extrusion-based 3D printing, also known as Direct Ink Writing (DIW), robocasting, and often simply 3D printing, provides a unique approach to introduce advanced and high-added-value materials with limited availability into lab-scale manufacturing. On the other hand, 2D colloids of graphene oxide (GO) exhibit a fascinating rheology and can aid the processing of different materials to develop ‘printable’ formulations. This work provides an in-depth rheological study of GO suspensions with a wide range of behaviours from Newtonian-like to viscoelastic ‘printable’ soft solids. The combination of extensional and shear rheology reveals the network formation process as GO concentration increases from <0.1 vol% to 3 vol%. Our results also demonstrate that the quantification of ‘printability’ can be based on three rheology parameters: the stiffness of the network via the storage modulus (G′), the solid-to-liquid transition or flow stress (σf), and the flow transition index, which relates the flow and yield stresses (FTI = σf/σy).

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 13 Dec 2018 09:20
Last Modified: 19 Jan 2023 01:09
DOI: 10.1039/C8SM01936C
Open Access URL: https://pubs.rsc.org/en/content/articlelanding/201...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3029873