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Experiments in Fluids

, Volume 43, Issue 4, pp 525–533 | Cite as

Quantum nanospheres for sub-micron particle image velocimetry

  • Patrick E. Freudenthal
  • Matt Pommer
  • Carl D. Meinhart
  • Brian D. Piorek
Research Article

Abstract

Quantum Nanospheres™ (QNs) have been developed as a new type of flow-tracing particle for micron resolution particle image velocimetry (PIV). The 70 nm diameter QNs were created by conjugating quantum dots to polystyrene beads. The fluorescent QNs have a large Stokes’ shift and are impervious to photobleaching. The use of QNs as flow-tracing particles for micro-PIV was demonstrated by measuring fluid motion in a 30 × 300 μm channel. Using an interrogation region of 1 × 1,024 pixels and ensemble averaging 1,800 image pairs, the physical volume of the interrogation region was 117 μm × 117 μm × 2 μm.

Keywords

Brownian Motion Particle Image Velocimetry Particle Image Velocimetry Measurement Interrogation Region Particle Image Velocimetry Experiment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

PIV

Particle image velocimetry

QD

Quantum dot

QN

Quantum nanosphere

CdSe

Cadmium selenide

ZnS

Zinc sulfide

Nd:YAG

Neodymium-doped yttrium aluminum garnet

PSB

Polystyrene bead

SEM

Scanning electron microscope

Notes

Acknowledgments

This work has been supported by the Institute for Collaborative Biotechnologies through grant DAAD19-03-D-0004 from the U.S. Army; by AFOSR grants FA9550-04-C-0114 & FA9950-04-0106; and by NSF:NIRT CTS-0404444. We would like to thank Ms Tanja Siegmann, of the University of Bremen, who conducted the initial investigation into the use of QDs as flow-tracing particles. The experiments conducted in this research comply with the current laws of the United States of America, where they were performed.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Patrick E. Freudenthal
    • 1
  • Matt Pommer
    • 2
  • Carl D. Meinhart
    • 2
  • Brian D. Piorek
    • 3
  1. 1.Nanex LLCSanta BarbaraUSA
  2. 2.Department of Mechanical and Environmental EngineeringUniversity of CaliforniaSanta BarbaraUSA
  3. 3.Chemistry DepartmentUniversity of CaliforniaSanta BarbaraUSA

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