Measurement of monolayer viscosity using noncontact microrheology.

Measurement of monolayer viscosity using non-contact microrheology: Supplementary information

Dynamics in Ultrathin Films: Particle Tracking Microrheology of Lang- muir Monolayers

Particle tracking has been shown to be a powerful technique for measuring bulk and interfacial rheology of fluids. The Brownian motion of microparticles trapped at interfaces is very sensitive to the viscosity of the subphase, and to the contact angle of the particles. The Stokes-Einstein relation is fulfilled if the friction factor is properly taken into account. The diffusion coefficient of t...

Active Microrheology of Intestinal Mucus in the Larval Zebrafish

Mucus is a complex biological fluid that plays a variety of functional roles in many physiological systems. Intestinal mucus in particular serves as a physical barrier to pathogens, a medium for the diffusion of nutrients and metabolites, and an environmental home for colonizing microbes. Its rheological properties have therefore been the subject of many investigations, thus far limited, howeve...

Passive non-linear microrheology for determining extensional viscosity

Passive non-linear microrheology for determining extensional viscosity Kai-Wen Hsiao,1 Jelena Dinic,2 Yi Ren,1 Vivek Sharma,2 and Charles M. Schroeder1,a) 1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S Mathews Avenue, Urbana, Illinois 61801, USA 2Department of Chemical Engineering, University of Illinois at Chicago, 810 S Clinton St., Chi...

Optical Microrheology of Biopolymers

We use passive and active techniques to study microrheology of a biopolymer solution. The passive technique is video tracking of tracer particles in the biopolymer, a technique which is well established. The active technique is based on rotating optical tweezers, which is used to study viscosity. A method to actively measure viscoelascity using time varying rotation of a particle trapped in opt...