In-situ characterisation of the dynamics of a growing dust particle cloud in a direct-current argon glow discharge

The growth and the dynamics of a tungsten nanoparticle cloud were investigated in a direct-current low pressure argon glow discharge. Real-time analyses of the dust particle size and number concentration were performed in-situ by light extinction spectrometry, while spatial dynamics of the cloud was...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2015-12, Vol.49 (4), p.45203-45214
Main Authors: Barbosa, S, Couëdel, L, Arnas, C, Kumar, K Kishor, Pardanaud, C, Onofri, F R A
Format: Article
Language:English
Subjects:
Argon
Clouds
diagnostics
Dust
Dynamic tests
Dynamics
Extinction
Glow discharges
Instrumentation and Detectors
nanoparticles
Optics
Physics
plasma
Plasma Physics
Spectroscopy
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Summary:The growth and the dynamics of a tungsten nanoparticle cloud were investigated in a direct-current low pressure argon glow discharge. Real-time analyses of the dust particle size and number concentration were performed in-situ by light extinction spectrometry, while spatial dynamics of the cloud was investigated with the laser light-sheet scattering method. Additional off-line electron microscopy and Raman spectroscopy measurements were also performed for comparison purpose. This experimental work reveals the existence of an agglomeration phase followed by the appearance of a new dust particle generation. While growing, the dust cloud is pushed towards the anode and the discharge edge. Afterwards, a new dust particle generation can grow in the space freed by the first generation of nanoparticles. The continuous growth, below the light extinction spectrometry scanning positions, explains the apparent dissimilarities observed between the in-line optical and the off-line electron microscopy analyses.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/49/4/045203