Nozzle-Free Liquid Microjetting via Homogeneous Bubble Nucleation

Taehwa Lee, Hyoung Won Baac, Jong G. Ok, Hong Seok Youn, and L. Jay Guo
Phys. Rev. Applied 3, 044007 – Published 16 April 2015
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Abstract

We propose and demonstrate a physical mechanism for producing liquid microjets by taking an optoacoustic approach that can convert light to sound through a carbon-nanotube-coated lens, where light from a pulsed laser is converted to high momentum sound wave. The carbon-nanotube lens can focus high-amplitude sound waves to a microspot of <100μm near the air-water interface from the water side, leading to microbubbles in water and subsequent microjets into the air. Laser-flash shadowgraphy visualizes two consecutive jets closely correlated with bubble dynamics. Because of the acoustic scattering from the interface, negative pressure amplitudes are significantly increased up to 80 MPa, even allowing homogeneous bubble nucleation. As a demonstration, this nozzle-free approach is applied to inject colored liquid into a tissue-mimicking gel as well as print a material on a glass substrate.

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  • Received 12 December 2014

DOI:https://doi.org/10.1103/PhysRevApplied.3.044007

© 2015 American Physical Society

Authors & Affiliations

Taehwa Lee1, Hyoung Won Baac2, Jong G. Ok3, Hong Seok Youn4,5,*, and L. Jay Guo1,4,†

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
  • 2School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea
  • 3Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, Seoul 139-743, Korea
  • 4Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA
  • 5National Center for Nanoprocess and Equipment, Korea Institute of Industrial Technology (KITECH), Gwangju 500-480, Korea

  • *Present address: Department of Mechanical Engineering, Hanbat National University, Daejeon 305-719, Korea.
  • Corresponding author. guo@umich.edu

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Issue

Vol. 3, Iss. 4 — April 2015

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