Correlation between the rheology of electronic inks and the droplet size generated from a capillary nozzle in dripping regime

• Type: Article in International Scientific Journal
• Date: 2023-09-01

Authors

Rijo, P.C. (Author) FEUP; Cremonezzi, J. M. O. (Author) Other; Ricardo J. E. Andrade (Author) Other; Galindo Rosales, FJ (Author) FEUP

Journal

Title: Physics of Fluids

Vol. 35

ISSN: 1070-6631

Publisher: American Institute of Physics

Indexing

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Other information

Authenticus ID: P-00Z-39R

DOI: 10.1063/5.0166228

Abstract (EN): This study provides a complete rheological characterization of bidimensional (2D) nanomaterial dispersions, employed as 2D-inks precursors in printed electronics. Three different 2D nanomaterials [molybdenum disulfide (MoS2), graphene, and hexagonal boron nitride (hBN)] were dispersed in a Newtonian fluid (toluene) and a viscoelastic fluid (toluene + ethyl cellulose) with different polymer concentrations. The presence of nanosheets does not change the shear rheology of the carrier fluid. Regarding the extensional rheology, the results showed that the pinch-off phenomenon is present in all toluene suspensions; however, the presence of the ethyl cellulose introduces elasticity in the system, even leading to the formation of beads-on-a-string, and the relaxation times of the suspensions depend on the kind of nanosheets present in the fluid. As controlling the droplet size when dispensing 2D-inks is of paramount importance for printed electronics as well as for many other applications, here it is presented a correlation between the rheological properties of these 2D-inks precursors and their droplet size when generated from a capillary nozzle in the dripping regime.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15