Transport Phenomena in Printable Electronics
This project seeks to advance the fundamental understanding of transport processes of inkjet-printed functional materials on flexible substrates through the integration of innovative research and education. The research combines novel modeling and experiments that include: (i) in-situ observation and multi-scale modeling of the flow, heat and mass transfer induced by the interplay of wetting, evaporation, and self-assembly of inkjet-deposited materials; (ii) laser and plasma substrate surface modification for improved deposition in a roll-to-roll (R2R) format; and (iii) microstructural and electrical-thermalmechanical property characterization of deposited material. The focus is on the mesoscopic scale, where Marangoni flow, evaporation, and particle self-assembly can be directly observed.
Coupled Reaction and Wetting Dynamics in Droplet Spreading
Fundamental understanding of coupled reaction and wetting dynamics during reactive wetting is crucial in creating stronger bonds in materials joining, better adhesion for thin film coating, novel composites for bio-implants, and new routes for surface modification with tunable functionalities. This award supports theoretical and computational research and educational activities related to coupled reaction and wetting dynamics in droplet spreading. Special attention is paid to examine the effect of intermetallic compound formation on drop wetting kinetics, contact line advancement, and the evolution of the solid-liquid interface. Using a multi-scale model that integrates the hybrid phase-field and arbitrary Lagrangian-Eulerian approach at the macroscopic scale and molecular dynamics simulations at the atomistic level, this project seeks to answer: (i) What are the dominating driving forces and dissipation mechanisms in reactive wetting? (ii) How is material delivered to the contact line during new interface formation? (iii) How does the S/L interface evolve during coupled reaction and wetting?