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Inertial mass measurements at the microscale in liquid.

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Researchers developed a novel picobalance for precise mass measurements in liquids. This breakthrough enables accurate quantification of mass in submerged environments, advancing micro- and nanotechnologies.

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Area of Science:

  • Physics and Metrology
  • Micro- and Nanotechnology

Background:

  • Accurate mass quantification is crucial for science and technology, with existing methods typically limited to vacuum or air.
  • Measuring mass directly in liquid environments is challenging, hindering advancements in fields like cell biology and micro-device development.

Purpose of the Study:

  • To develop and demonstrate a method for accurate mass measurement of objects submerged in liquid.
  • To overcome the limitations of traditional mass sensing techniques in fluidic environments.

Main Methods:

  • Utilized a custom-built, photothermally actuated inertial picobalance.
  • Performed cantilever-based mass measurements on silicon microweight samples in liquid (water and denser liquids).

Main Results:

  • Successfully determined the actual mass of samples submerged in water.
  • Demonstrated accurate mass measurement even in liquids denser than the samples themselves.

Conclusions:

  • It is feasible to perform precise mass measurements in liquid environments using the developed picobalance.
  • This technique is expected to drive innovation in mass sensing, metrology, and understanding micro-systems in liquids.