Title: Microgels in Microfluidic Capillaries
Speaker: Dr. Ozan S Sariyer
Date/Time: January 26, 2016 Tuesday, 13:40 - 14:30
Place: FENS G035
Abstract: Flow of soft matter objects through one-dimensional environments is important in industrial, biological and biomedical systems; as establishing the underlying principles of the behavior of soft matter in confinement can shed light on many artificial and natural systems. We report an experimental and theoretical study of translocation of μm-size hydrogels (microgels) through microfluidic channels with a diameter smaller than an unperturbed microgel size (see Fig. 1). For microgels with different dimensions and mechanical properties, under a range of applied pressures, we established the universal principles of microgel entrance and passage through microchannels with different geometries. We also show a non-monotonic change in the flow rate of liquid through the constrained microgel, governed by its progressive confinement. Experimental results were in agreement with the theory for non-linear deformation of gels. Our work has implications for a broad range of phenomena, including occlusion of blood vessels by thrombi and needle-assisted hydrogel injection in tissue engineering.