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Atmospheric-pressure dielectric barrier discharge with capillary injection for gas-phase nanoparticle synthesis

Ghosh, Souvik, Liu, Tianqi, Bilici, Mihai, Cole, Jonathan, Huang, I-Min, Staack, David, Mariotti, D and MohanSankaran, R (2015) Atmospheric-pressure dielectric barrier discharge with capillary injection for gas-phase nanoparticle synthesis. Journal of Physics D: Applied Physics, 48 (31). p. 314003. [Journal article]

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URL: http://stacks.iop.org/0022-3727/48/i=31/a=314003

Abstract

We present an atmospheric-pressure dielectric barrier discharge (DBD) reactor for gas-phase nanoparticle synthesis. Nickel nanoparticles are synthesized by homogenous nucleation from nickelocene vapor and characterized online by aerosol mobility measurements. The effects of residence time and precursor concentration on particle growth are studied. We find that narrower distributions of smaller particles are produced by decreasing the precursor concentration, in agreement with vapor nucleation theory, but larger particles and aggregates form at higher gas flow rates where the mean residence time should be reduced, suggesting a cooling effect that leads to enhanced particle nucleation. In comparison, incorporating a capillary gas injector to alter the velocity profile is found to significantly reduce particle size and agglomeration. These results suggest that capillary gas injection is a better approach to decreasing the mean residence time and narrowing the residence time distribution for nanoparticle growth by producing a sharp and narrow velocity profile.

Item Type:Journal article
Keywords:dielectric barrier discharge, atmospheric-pressure plasma, nanoparticle, homogeneous nucleation, aerosol
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:32140
Deposited By: Professor Davide Mariotti
Deposited On:06 Aug 2015 10:15
Last Modified:17 Oct 2017 16:19

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