The building blocks behind the electrohydrodynamics of non-polar 2D-inks

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Rijo, PC (Author) Other; Galindo Rosales, FJ (Author) FEUP

Journal

Title: Applied Materials Today

Vol. 36

ISSN: 2352-9407

Publisher: Elsevier

Indexing

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Other information

Authenticus ID: P-00Z-RG5

DOI: 10.1016/j.apmt.2023.102042

Abstract (EN): This work provides a complete rheological characterization of 2D-inks in electric fields with different intensities and orientations to the imposed flow field. 2D nanomaterials used in this study are graphene nanoplatelets, hexagonal boron-nitride, and molybdenum disulfide. These materials with different electric properties are dispersed in a non-polar solvent (Toluene) with different concentrations of Ethyl Cellulose (EC), providing Newtonian or viscoelastic characteristics. Shear rheology tests show that the presence of nanoparticles barely changes the fluid behavior from the carrier fluid, and the application of an electric field perpendicular to the flow does not result in electrorheological behavior. However, extensional experiments, which mimic the actual EHD jet printing conditions, allowed the observation of the influence of both the particles and the electric field aligned on the filament thinning process. It was observed that the electric field generates vortices due to an electrophoretic effect in the carrier fluid when EC is present in the formulations, which has severe consequences on the stability of the liquid bridges, whereas it scarcely affects the shear viscosity; additionally, the kind of 2D nanoparticles modifies also the conductivity and permittivity of the solution, inducing Maxwell stresses that also make the filament more stable against surface tension.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13