291027 Behavior of Janus Particles As Osmotic Motors near a Solid/Liquid Interface

Monday, October 29, 2012
Hall B (Convention Center )
Evgeniya Rubin, Ilona Kretzschmar and Bin Ren, Chemical Engineering, The City College of New York, The City University of New York, New York, NY

Small autonomous swimming devices have potential application in modeling microfluidic transport systems for controlled drug delivery, microcircuit assembly and efficient battery manufacture. Some of these devices are driven by the application of an external field force such as an electric or magnetic field, others are propelled by solution born stimuli such as a pH change or a concentration gradient. Understanding of such motion in relation to particle patch size and thickness as well as velocity and direction of propagation has been advanced by a number of researchers. In this study we investigated Janus particles, asymmetric surface spheroids with a 50 % platinum cap, the motion of which is actuated by catalytic decomposition and the resulting chemical concentration gradient around the Janus particle. To study this topic 4 um silicon dioxide Janus Particles were observed in a hydrogen peroxide (H2O2) solution. We present our analysis of the metal patch rotation, which reveals itself to be constrained to a 2D rotation near a solid/liquid interface and suggest a hydrodynamic interaction model for future analysis.

Extended Abstract: File Not Uploaded
See more of this Session: Student Poster Session: Materials Engineering and Sciences
See more of this Group/Topical: Student Poster Sessions