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Related Experiment Videos

Chembio extraction on a chip by nanoliter droplet ejection.

Hongyu Yu1, Jae Wan Kwon, Eun Sok Kim

  • 1Department of Electrical Engineering, University of Southern California, 3737 Watt Way, PHE 612, Los Angeles, CA 90089-0271, USA.

Lab on a Chip
|February 24, 2005
PubMed
Summary

A novel ultrasonic droplet ejector precisely separates liquids for chemical and biological extraction. This technology enables efficient, non-mixing liquid recovery from aqueous two-phase systems (ATPS) using acoustic streaming.

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Area of Science:

  • Chemical Engineering
  • Biotechnology
  • Analytical Chemistry

Background:

  • Liquid separation is crucial for chemical and biological applications.
  • Traditional methods can be time-consuming, imprecise, or cause unwanted mixing.
  • Aqueous two-phase systems (ATPS) offer unique separation possibilities but require specialized techniques.

Purpose of the Study:

  • To introduce a novel ultrasonic nanoliter-liquid-droplet ejector for precise liquid separation.
  • To demonstrate the technique's efficacy in extracting materials from aqueous two-phase systems (ATPS).
  • To showcase its application in recovering specific liquid layers and separating particles.

Main Methods:

  • Development of an ultrasonic droplet ejector using a PZT sheet.

Related Experiment Videos

  • Utilizing acoustic streaming generated by a focused acoustic beam.
  • Digital control of nanoliter droplet ejection for precise volume extraction.
  • Application in Dextran-polyethylene glycol-water ATPS, particle separation, and oil-water separation.

    • Main Results:

    • Successful recovery of 16 microliters of top-layer liquid from an ATPS within 20 seconds.
    • Ejection of micron-sized particles from water surfaces using droplet ejection.
    • Efficient separation of an oil layer from a water layer.

    Conclusions:

    • The ultrasonic droplet ejector provides a precise and non-invasive method for liquid separation.
    • This technique is highly effective for recovering specific liquid phases and particles from ATPS.
    • The technology holds significant potential for various chemical and biological extraction processes.