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Elastocapillary Transition in Gel Drop Oscillations.

X Shao1, S A Fredericks2, J R Saylor1

  • 1Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634, USA.

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|November 26, 2019
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Summary
This summary is machine-generated.

We observed surface oscillations in ultrasoft agarose gel drops using ultrasonic levitation. The natural frequency depends on the elastocapillary number, showing distinct elastic and capillary wave behaviors.

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Area of Science:

  • Soft matter physics
  • Rheology
  • Acoustic manipulation

Background:

  • Ultrasoft materials like gels exhibit unique mechanical properties.
  • Understanding droplet dynamics is crucial in various scientific and industrial applications.
  • Acoustic levitation offers a non-contact method for manipulating soft materials.

Purpose of the Study:

  • To experimentally investigate surface oscillations in ultrasoft agarose gel drops.
  • To determine the relationship between natural frequency and the elastocapillary number.
  • To explore the transition between elastic and capillary wave regimes.

Main Methods:

  • Utilizing ultrasonic levitation to excite and control shape oscillations.
  • Fabricating ultrasoft agarose gel drops with controlled properties.
  • Measuring the natural frequency of oscillation across a range of parameters.

Main Results:

  • Observed surface oscillations in ultrasoft agarose gel drops.
  • Reported the natural frequency as a function of the elastocapillary number.
  • Recovered established scaling laws in elastic and capillary wave limits.
  • Documented the crossover between these two regimes, agreeing with theoretical predictions.

Conclusions:

  • The study provides experimental validation for the behavior of ultrasoft gel drops under acoustic excitation.
  • The elastocapillary number effectively characterizes the frequency dependence of oscillations.
  • The findings contribute to the understanding of soft matter dynamics and acoustic manipulation.