Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W18: Fluids XII
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 210
Sponsoring
Unit:
DFD
Chair: Maziyar Jalaal, University of Amsterdam
Abstract: W18.00003 : Influence of fluid viscosity on elastocapillary coiling*
3:24 PM–3:36 PM
Presenter:
JP P Raimondi
(University of California, Santa Barbara)
Authors:
JP P Raimondi
(University of California, Santa Barbara)
Sara Gonzalez
(University of California, Santa Barbara)
Emilie Dressaire
(University of California Santa Barbara)
purpose. The capture thread is a soft, extensible silk thread decorated with sticky glue droplets
which adhere prey to the web. Elastocapillary interactions cause the silk thread to buckle and then
coil within the glue droplets as the thread is compressed. The surface tension of the droplets keep
the fiber taut. This means that the capture thread can be compressed far beyond the length at which
an uncoated fiber would begin to sag while remaining taut. It is hypothesized that this morphology
evolved to prevent the web from tangling with itself during wind loading or insect impact. We
expand upon previous studies by exploring the effects of droplet viscosity on the dynamic response
of the drop on fiber system. We test a model system composed of a polymer fiber and silicone oil
droplets and measure the sub micronewton tension in the thread during coiling using micropipette
force sensing.The results of this study will provide a deeper understanding of how spider webs
work and could be used to create solid-liquid hybrid metamaterials.
*This research was supported by the MRSEC Program of the National Science Foundation under Award No. DMR-1720256.
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