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This study provides a complete rheological characterization of 2Dnanomaterial dispersions, employed as 2D-inks precursors in printedelectronics. 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 differentpolymer concentrations. The presence of nanoparticles does not change the shearrheology of the carrier fluid. Regarding the extensional rheology, the resultsshowed that the pinch-off phenomenon is present in all Toluene suspensions;however, the presence of the ethyl cellulose introduces elasticity in thesystem, even leading to the formation of beads-on-a-string, and the relaxationtimes of the suspensions depends on the kind of nanoparticles present in thefluid. As controlling the droplet size when dispensing 2D-inks is of paramountimportance for printed electronics, as well as for many other applications,here it is presented a correlation between the rheological properties of these2D-inks precursors and their droplet size when generated from a capillarynozzle in dripping regime.

Correlation between the rheology of 2D-inks precursors and the droplet size generated from a capillary nozzle in dripping regime