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Topological acoustofluidics.

Shuaiguo Zhao1, Zhenhua Tian1,2, Chen Shen3,4

  • 1Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC, USA.

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Summary
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Topological acoustofluidic chips harness elastic valley spin and fluid dynamics to create novel particle transport and DNA manipulation methods. This research visualizes topological physics and opens doors for life science applications.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics
  • Biotechnology

Background:

  • Natural materials exhibit complex topological phenomena through spin, valley, and lattice interactions.
  • Topological wave materials and hydrodynamics offer potential for visualizing topological physics and unconventional bioparticle manipulation.

Purpose of the Study:

  • To illustrate the interaction between elastic valley spin and nonlinear fluid dynamics using topological acoustofluidic chips.
  • To explore backward-immune particle transport and nanoscale manipulation of bioparticles.

Main Methods:

  • Fabrication and utilization of topological acoustofluidic chips.
  • Observation of valley streaming vortices and chiral swirling patterns using tracer particles.
  • Analysis of topological pressure wells and edge state bandwidth modulation.

Main Results:

  • Observed arrays of clockwise and anticlockwise valley vortices due to increased elastic spin density.
  • Discovered topological pressure wells for nanoscale DNA molecule manipulation.
  • Achieved a 93.2% modulation in edge state bandwidth based on substrate crystallographic orientation.

Conclusions:

  • Topological acoustofluidic chips effectively visualize elastic valley spin and topological physics.
  • Demonstrated potential for unconventional bioparticle manipulation and topological-material applications in life sciences.
  • This work paves the way for new discoveries in topological acoustofluidics.