Spinning and chaining emulsion droplets in ultrasonic standing waves
Abstract
We demonstrate experimentally that emulsion droplets of TPM (3-(trimethoxysilyl)propyl methacrylate) in water spin when levitated in ultrasound, and that the spinning droplets organize themselves into long spinning chains. When the same droplets are solidified into spheres by free-radical polymerization, they no longer spin, and they form crystals rather than chains. We explain these acoustokinetic phenomena through a dipole-order expansion of the incident and scattered waves, by analogy to the theory of optical trapping.
This work was supported by the Materials Research Science and Engineering Center program of the National Science Foundation through Award Number DMR-1420073.- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARH58011A