Abstract
Quantum Nanospheres TM (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 lm 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 lm · 117 lm · 2 lm.
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