120 citations · 251 across the 11 of their papers we have counts for
11 papers
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…
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…
Assessing the pair interactions of pNIPAM microgel particles using optical tweezers
José Muñetón-Díaz, 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…
A Free Energy Model for the Plateau Shear Modulus in Thermosensitive Microgel Suspensions
Maxime Bergman, Yixuan Xu, José Muñéton Díaz +3
Polymer microgels exhibit intriguing macroscopic flow properties arising from their unique microscopic structure. Microgel colloids usually comprise a crosslinked polymer network w…
Probing temperature-responsivity of microgels and its interplay with a solid surface by superresolution microscopy and numerical simulations
Xhorxhina Shaulli, Rodrigo Rivas-Barbosa, Maxime Jolisse Bergman +4
Superresolution microscopy has become a powerful tool to investigate the internal structure of complex colloidal and polymeric systems, such as microgels, at the nanometer scale. T…
Relationship between Rheology and Structure of Interpenetrating, Deforming and Compressing Microgels
Gaurasundar M. Conley, James L. Harden, Frank Scheffold
Thermosensitive microgels are widely studied hybrid systems combining properties of polymers and colloidal particles in a unique way. Due to their complex morphology their interact…
Observation of strongly heterogeneous dynamics at the depinning transition in a colloidal glass
Nesrin Şenbil, Markus Gruber, Chi Zhang +2
We study experimentally the origin of heterogeneous dynamics in strongly driven glass-forming systems. Thereto, we apply a well-defined force with a laser line trap on individual c…
Improved diffusing wave spectroscopy based on the automatized determination of the optical transport and absorption mean free path
Chi Zhang, Mathias Reufer, Danila Gaudino +1
Diffusing wave spectroscopy (DWS) can be employed as an optical rheology tool with numerous applications for studying the structure, dynamics and linear viscoelastic properties of…
Dynamical and structural signatures of the glass transition in emulsions
Chi Zhang, Nicoletta Gnan, Thomas G. Mason +2
We investigate structural and dynamical properties of moderately polydisperse emulsions across an extended range of droplet volume fractions phgr, encompassing fluid and glassy sta…
Tracking of colloids close to contact
Chi Zhang, Georges Brügger, Frank Scheffold
The precise tracking of micron sized colloidal particles - held in the vicinity of each other using optical tweezers - is an elegant way to gain information about the particle-part…
Structure of marginally jammed polydisperse packings of frictionless spheres
Chi Zhang, Cathal B. O'Donovan, Eric I. Corwin +4
We model the packing structure of a marginally jammed bulk ensemble of polydisperse spheres using an extended granocentric mode explicitly taking into account rattlers. This leads…