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Optothermal generation, trapping, and manipulation of microbubbles.

J A Sarabia-Alonso, J G Ortega-Mendoza, J C Ramírez-San-Juan

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    |July 19, 2020
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    Summary
    This summary is machine-generated.

    Researchers developed a novel optothermal method using pulsed lasers and silver nanoparticles to generate and manipulate microbubbles in ethanol. This technique offers precise control over bubble dynamics for potential microfluidic applications.

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    Area of Science:

    • Optics and Photonics
    • Microfluidics
    • Nanotechnology

    Background:

    • Conventional optical methods for bubble generation and manipulation rely on continuous-wave (CW) lasers and temperature gradients.
    • Existing techniques face limitations in precise control and dynamic manipulation of bubbles in liquid environments.

    Purpose of the Study:

    • To present a novel method for generating and manipulating microbubbles in ethanol using optothermal forces.
    • To demonstrate 3D manipulation capabilities of microbubbles generated via pulsed laser interaction with silver nanoparticles.

    Main Methods:

    • Utilized a nanosecond pulsed laser (λ = 532 nm) to induce optothermal forces at a silver nanoparticle-ethanol interface.
    • Photodeposited silver nanoparticles on a multimode optical fiber tip for localized light absorption and heating.
    • Leveraged rapid heating beyond the ethanol critical point for spontaneous nucleation and bubble generation.

    Main Results:

    • Successfully generated a stream of microbubbles via pulsed laser irradiation at a 10 kHz repetition rate.
    • Observed bubble collapse producing a counterjet that ejects microbubbles, enabling continuous generation.
    • Demonstrated 3D manipulation of a larger, coalesced bubble attracted to the optical fiber via Marangoni forces and driven by optothermal forces.

    Conclusions:

    • The proposed optothermal method effectively generates and manipulates microbubbles in ethanol with high precision.
    • This technique offers a promising platform for advanced microfluidic applications requiring controlled bubble dynamics.