4 papers
Expanding the reach of diffusing wave spectroscopy and tracer bead microrheology
Manuel Helfer, Chi Zhang, Frank Scheffold
Diffusing Wave Spectroscopy (DWS) is an extension of standard dynamic light scattering (DLS), applied to soft materials that are turbid or opaque. The propagation of light is model…
Photo-Thermal Actuation of Hybrid Microgels with Dual Laser Optical Tweezers
S. -H. Jung, C. Zhang, N. Stauffer +2
Soft actuators that respond to external stimuli play a fundamental role in microscale robotics, active matter, and bio-inspired systems. Among these actuators, photo-thermal hybrid…
A Free Energy Model for the Plateau Shear Modulus in Thermosensitive Microgel Suspensions
Maxime Bergman, Yixuan Xu, José Muñéton DÃaz +3
Polymer microgels exhibit intriguing macroscopic flow properties arising from their unique microscopic structure. Microgel colloids usually comprise a crosslinked polymer network w…
Assessing the pair interactions of pNIPAM microgel particles using optical tweezers
José Muñetón-DÃaz, Chi Zhang, Priti Mohanty Priti +1
We experimentally study the pairwise interactions between poly(N-isopropylacrylamide) (pNIPAM) microgel particles using line optical tweezers. To measure their interaction potentia…