A graduate laboratory experiment to study the dynamics of an acoustically levitated particle

Article Engineering, Mechanical

Nonlinear coupling between radial and axial vibrations during single-axis acoustic levitation in mid-air

Naohiro Sugita et al.

Summary: In this study, a nonlinear dynamic model for single-axis standing-wave acoustic levitation is investigated both theoretically and experimentally. The aim is to understand the nonlinear coupling between radial and axial vibrations and its impact on levitation stability. A power series expansion of the acoustic radiation force acting on a levitated spherical particle is employed, allowing for the specific consideration of the nonlinear coupling term in the equation of motion. Experimental measurements are compared with the derived asymptotic solutions to validate the coupling effect. The results show that the natural radial frequency decreases due to axial vibration, leading to destabilization of the radial equilibrium state.

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES (2023)

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Article Physics, Applied

Acoustic levitation synthesis and subsequent physicochemical properties of bimetallic composite nanoparticles

Yuhang Zheng et al.

Summary: Bimetallic noble-metal nanoparticles were synthesized without a container using acoustic levitation, resulting in smaller size, narrower distribution, and improved catalytic performance. The use of oleylamine as stabilizer and borane-t-butylamine complex as reducing agent facilitated the preparation of Au-Ag nanoparticles. The catalytic activity of equiatomic Au-Ag nanoparticles was significantly enhanced due to synergistic effects in acoustic levitation.

APPLIED PHYSICS LETTERS (2023)

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Article Chemistry, Analytical

Oscillation Dynamics of Multiple Water Droplets Levitated in an Acoustic Field

Koji Hasegawa et al.

Summary: This study aimed to improve and investigate the oscillation dynamics and levitation stability of acoustically levitated water droplets. The number and position of levitated droplets were found to be crucial for levitation stability.

MICROMACHINES (2022)

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Article Physics, Applied