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9 September 2019 3D manipulation of microbubbles by laser-induced thermal gradients
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We present the generation and 3D manipulation of microbubbles by thermal gradients, induced by low power nanosecond pulsed laser in non-absorbent liquids. Light absorption at photodeposited silver nanoparticles on the optical fiber tip heat up the surrounding liquid, which leads to optothermal effects. With each laser pulse a microbubble is detached from the optical fiber end, creating a microbubbles-stream. The microbubbles move away from the optical fiber end driven by non-spherical cavitation until they coalesce creating a main-bubble which is attracted towards the optical fiber end by Marangoni force. In addition, the main-bubbles are under the influence of buoyancy and gravity forces, which act upwards and downwards, respectively. The balance of these forces allows the 3D manipulation of the main-bubble. The main-bubble position can be controlled by careful control of the pulse energy. To our knowledge this is the first time that 3D manipulation of microbubbles using pulsed lasers is demonstrated.
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J. A. Sarabia-Alonso, J. O. Ortega-Mendoza, J. C. Ramírez-San-Juan, P. Zaca-Morán, A. Padilla-Vivanco, J. Ramírez-Ramírez, and R. Ramos-García "3D manipulation of microbubbles by laser-induced thermal gradients", Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110832X (9 September 2019);

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