Subpicoliter droplet generation based on a nozzle-free acoustic transducer

Chuang Yuan Lee, Wei Pang, Hongyu Yu, Eun Sok Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This letter reports picoliter liquid droplet generation using an orifice-free acoustic ejector operating at its harmonic frequencies. For an acoustic ejector working at the thickness-mode resonance, the droplet size is primarily determined by the acoustic wavelength, which is proportional to the piezoelectric substrate thickness. In our design, we do not need to lap the bulk piezoelectric lead zirconate titanate (PZT) substrate or deposit high temperature processing PZT thin film, but we use harmonic frequencies of the bulk form to reduce the wavelength. The fabricated acoustic ejector with a size of 1200×1200 μ m2 has been shown to be very effective up to the ninth harmonic (180 MHz), continuously ejecting ∼10 μm diameter droplets, corresponding to droplet volumes as small as 0.5 pl.

Original languageEnglish (US)
Article number034104
JournalApplied Physics Letters
Volume93
Issue number3
DOIs
StatePublished - 2008

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ejectors
nozzles
transducers
acoustics
harmonics
orifices
wavelengths
deposits
liquids
thin films

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Subpicoliter droplet generation based on a nozzle-free acoustic transducer. / Lee, Chuang Yuan; Pang, Wei; Yu, Hongyu; Kim, Eun Sok.

In: Applied Physics Letters, Vol. 93, No. 3, 034104, 2008.

Research output: Contribution to journalArticle

Lee, Chuang Yuan ; Pang, Wei ; Yu, Hongyu ; Kim, Eun Sok. / Subpicoliter droplet generation based on a nozzle-free acoustic transducer. In: Applied Physics Letters. 2008 ; Vol. 93, No. 3.
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