Smart Fluids
Magnetic fluids & rheometry
In 2015, we developed a prototype version of an add-on for the commercial extensional rheometer CaBER, which applied an external magnetic field perpendicular or parallel to the flow direction. This setup proved to be useful for selecting the nanoparticles to be used in the technique for magnetic cleaning of oil spills, and it is currently being used for analysing the influence of external magnetic fields on the extensional rheological behaviour of human blood laden with magnetic particles (MagneticBlood project).
2D-inks
Since 2018, in collaboration with Prof. R. Andrade from MacGraph (Brazil) we have been addressing the challenge of printability for inks formulated with 2D materials—a key factor for industrial-scale production. We aim to resolve the current paradox where enhancing rheological properties through chemical additives compromises the essential electro-mechanical-optical qualities for printed electronics. Our approach focuses on optimizing the nozzle geometry and printing conditions to harmonize with the ink’s rheological behaviour rather than relying on detrimental chemical modifications. Currently, we are collaborating with Prof. J.M. Montanero from the University of Extremadura (Spain) to expand this approach to electrohydrodynamic printing techniques.
Shear thickening fluids in eco-friendly composites
We have developed and patented a technology (PCT/IB2015/057399) able to improve the mechanical properties of microagglomerated cork pads undergoing impact, vibrations or noise by adding Shear-Thickening Fluids (STFs) through optimized microfluidic patterns. We also funded a start-up company rheoINforced Optimal Performance, Lda. to commercialize this product. Nevertheless, most formulations for STFs reported in the literature are not environmentally friendly. We have formulated stable and eco-friendly STF successfully applied in cork helmet liners. Currently, we are working on a new formulation suitable for antivibration eco-friendly composites.