Investigation of the collective motion of water vapor microbubbles by thermoplasmonic effect

Kyoko Namura; Shuji Kondo; Motofumi Suzuki

doi:10.1117/12.2632401

3 October 2022 Investigation of the collective motion of water vapor microbubbles by thermoplasmonic effect

Kyoko Namura, Shuji Kondo, Motofumi Suzuki

Proceedings Volume 12197, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XX; 1219704 (2022) https://doi.org/10.1117/12.2632401
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

In this study, we successfully self-assembled a micropattern of gold thin films and used their photothermal conversion properties to generate five water vapor microbubbles in close proximity. An isolated microsphere array with a number density of approximately 1.2 × 10^-3 μm^-2 was fabricated using electrostatic adsorption and surface tension reduction and was ten times denser than the arrays prepared by the spin-coating method. The prepared microsphere array was used as a mask for shadow-sphere lithography to fabricate the petal-like gold micropatterns. One gold micropetal was created in the shadow of each sphere, with each petal having the ability to generate one water vapor microbubble photothermally. The sample was then immersed in degassed water and irradiated with a laser for heating. As a result, up to five water vapor microbubbles were successfully generated in the laser spot with a radius of 35 μm. The number of bubbles changed with time owing to their interaction, and the direction of the surrounding flow changed accordingly. These results contribute to our understanding of the generation of strong flows and the flow oscillations caused by multiple bubbles.

Conference Presentation

Citation Download Citation

Kyoko Namura, Shuji Kondo, and Motofumi Suzuki "Investigation of the collective motion of water vapor microbubbles by thermoplasmonic effect", Proc. SPIE 12197, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XX, 1219704 (3 October 2022); https://doi.org/10.1117/12.2632401

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