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Sub-Nanogram Resolution Measurement of Inertial Mass and Density Using Magnetic-Field-Guided Bubble Microthruster.

Leilei Wang1, Minjia Sheng2, Li Chen2

  • 1State Key Laboratory of Nonlinear Mechanics, Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 22, 2024
PubMed
Summary

Bubble microthrusters (BMTs) precisely manipulate microparticles using collapsing microbubbles. This technology enables real-time, chip-free measurement of microparticle mass and density, advancing microscale bioparticle characterization.

Keywords:
bubble microthrusterhydrodynamic jet flowmagnetic manipulationmass density of embryosub‐nanogram resolution

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Area of Science:

  • Micro/nanorobotics
  • Biophysics
  • Materials Science

Background:

  • Artificial micro/nanomotors offer potential in drug delivery and microfabrication.
  • Current limitations exist in upgrading micro/nanomotors for precise, sophisticated tasks.

Purpose of the Study:

  • Introduce the bubble microthruster (BMT) for precise microparticle manipulation and characterization.
  • Develop a method for real-time, chip-free measurement of microparticle mass and density.

Main Methods:

  • Utilized a bubble microthruster (BMT) focusing energy from collapsing microbubbles for inertial impact.
  • Employed ultra-high-speed imaging to determine microparticle mass and density via relaxation time.
  • Controlled BMT with a gamepad and magnetic-field guidance for precise manipulation.
  • Validated the technique by measuring polystyrene microparticle mass, hollow glass microsphere density, and mouse embryo mass densities.

Main Results:

  • Achieved sub-nanogram resolution in determining microparticle mass and density.
  • Demonstrated BMT method master curves are dependent on solution viscosity.
  • Successfully manipulated and characterized various microparticles, including bioparticles like mouse embryos.
  • Validated the technique for real-time, chip-free bioparticle characterization.

Conclusions:

  • The BMT technique offers a novel, highly maneuverable strategy for microscale manipulation and characterization.
  • Integrates bubble microrobot manipulation with precise bioparticle mass and density detection.
  • Facilitates advanced bioparticle characterizations, such as monitoring embryo growth.