Fascinating rheological properties like shear thickening/thinning and anisotropic viscosity arise from underlying structure in complex fluids. We develop and use techniques to simultaneously analyze emergent, large-scale properties and image particle-level positions and stresses in such suspensions.
Using a Biaxial Confocal-Rheoscope to Study Squishy Materials
Here a colloidal crystal freezes onto a square lattice template. The video is sped up by a factor of about 20.
This movie shows the break-up of a lyotropic surfactant in the lamellar phase. The break-up is symmetrip about the minimum radius and no satellite drops are formed. The frame rate is 20,000 f.p.s.
Bilayer colloidal crystal composed of ~1 micron silica colloids with a sticky "depletion" interaction. The colloidal particles that are not part of the crystal can be seen diffusing around.
Colloidal silica dimers undergoing rotational and translational Brownian motion.