Date(s) - 02/27/2024
9:00 am - 10:00 am
Title: Particle, substrate and a contact line: An alliance that continuously sparks questions
Farzam Zoueshtiagh, Ph.D.
University of Virginia
Dust, dirt or bacteria are common micron size objects that are parts of our life environment and are usually hard to circumvent. Despite their small size, their presence is often undesirable since they are usually considered as a source of pollution. For instance, in food industries, micron-seized bacteria/spores are at the origin of food contaminations whereas in microelectronics, the presence of dust can induce faulty microfabrication. Their removal is, therefore, of primary importance in various domain of applications and has yet to undergo technological improvements in order to reduce energy and water/detergent consumptions.
In this talk, we will briefly review our work on particle-substrate-contact line interaction [1-4]. Our focus will then shift toward examining the force needed to detach a particle from a surface based on their wetting characteristics . Specifically, we explore the influence of a trapped bubble between the particle and its substrate on this detachment force. This study shows that such a particular situation can occur when a particle is immersed on its substrate, a scenario frequently encountered in traditional cleaning procedures. The study incorporates both computational analyses and experiments involving the patch-clamp technique. The outcomes highlight the importance of surface-wetting characteristics in bubble entrapment which can significantly influences the detachment force. The findings offer insights into the conditions that facilitate the removal and cleaning of microparticles or dirt from a surface.
Dr. Farzam Zoueshtiagh is a professor from the University of Lille, France. He is currently a Fulbright Visiting Scholar at University of Florida’s Department of Chemical Engineering. He has specialized in experimental fluid mechanics and his research covers multiphase flows, hydrodynamic instabilities and patterns formation.
Dr. Zoueshtiagh completed a Master of Science in Geophysics at the University Joseph Fourier (1998, Grenoble-France) and then his Ph.D. at the School of Engineering of the University of Warwick (UK) on problems related to sand ripple formation (2001.) After his post-doc at PMMH-ESPCI laboratory (Paris, France) on interfacial instabilities, he joined the University of Lille (2003.) Since then, he has received several awards and financial support from French and European research agencies which funded his international collaborations with researchers in UF, Japan and India.