Nanoparticle dispersion in superfluid helium

Cryogenic fluid flows including liquid nitrogen and superfluid helium are a rich environment for novel scientific discovery. Flows can be measured optically and dynamically when faithful tracer particles are dispersed in the liquid. We present a reliable technique for dispersing commercially availab...

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Bibliographic Details
Published in:Review of scientific instruments 2014-07, Vol.85 (7), p.073705-073705
Main Authors: Meichle, David P, Lathrop, Daniel P
Format: Article
Language:English
Subjects:
Cryogenic fluids
Fluorescence
Helium
Liquid nitrogen
Nanoparticles
Scientific apparatus & instruments
Superfluidity
Tracer particles
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Summary:Cryogenic fluid flows including liquid nitrogen and superfluid helium are a rich environment for novel scientific discovery. Flows can be measured optically and dynamically when faithful tracer particles are dispersed in the liquid. We present a reliable technique for dispersing commercially available fluorescent nanoparticles into cryogenic fluids using ultrasound. Five types of fluorescent nanoparticles ranging in size from 5 nm to 1 μm were imaged in liquid nitrogen and superfluid helium, and were tracked at frame rates up to 100 Hz.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4886811