Tunable Morphologies of Dried Colloidal Deposits in Graphene Oxide-Laden Aqueous Sessile Droplets Mediated by Mesophase Characteristics

Subsequently, this results in uniform deposits with mosaic-like fine-structural morphologies. We also investigated concentration-dependent disordered (isotropic) and ordered phase-driven regimes of ring-like and uniform deposit patterns formed by both of the aforementioned GO suspensions. The mesophase characteristics were analyzed by precision experimental tools including Small-Angle X-ray Scattering (SAXS) and rheological tests to respectively elucidate the mesoscale structural correlations and mechanical strength of the aqueous colloidal suspensions.

The measurements corroborate theoretical frameworks involving the orientational order parameter and smectic elastic response. This work elucidates the general rules governing modulation in dried colloidal deposit patterns of GO due to structure–mesophase correlation, addressing variability in deposit patterns across GO samples with different structural features and providing useful insights for inkjet-printed electronic device fabrication.