Paper Number
PO80
Session
Poster Session
Title
Microrheological study of viscoelastic materials by magnetic tweezers
Presentation Date and Time
October 14, 2015 (Wednesday) 6:05
Track / Room
Poster Session / Atrium/Harborview
Authors
- Tan, Mingyang (Oregon State University, Chemical, Biological, and Environmental Engineering)
- Walker, Travis W. (Oregon State University, Chemical, Biological, and Environmental Engineering)
Author and Affiliation Lines
Mingyang Tan and Travis W. Walker
Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331
Speaker / Presenter
Tan, Mingyang
Text of Abstract
The behavior of heterogeneous soft solids is complex, as they exhibit both viscous and elastic properties that depend on the length-scales of their microstructures. Bulk rheological measurements can provide advanced metrics, such as modulus; however, the measurements of these physical properties are averaged over length-scales on the order of millimeters or greater. For homogeneous materials, bulk rheology is usually sufficient; however, heterogeneous soft solids with microstructures on the micron length-scale can have significantly different rheological responses, depending on the length-scale of the probe. Microrheology applies an external driving force to move micro-particles to probe the physical properties of a material on a length-scale down to a micron and below. In this study, magnetic tweezers, which create a magnetic field to drive magnetic micro-particles, are used to investigate the rheological properties of viscoelastic materials by oscillating and pulling the micro-particles. We investigate the rheological properties of viscoelastic mucus by using micro-particles with different sizes and surface chemistries. We also investigate the alignment of magnetic microdisks in viscoelastic materials using rotating magnetic fields and compare the dynamics of the alignment to our previous work with Newtonian fluids.