NDLI: Multiscale Simulation of Functionalization of Surfaces using Atmospheric Pressure Discharges

Content Provider	IEEE Xplore Digital Library
Author	Bhoj, A.N. Kushner, M.J.
Copyright Year	2005
Description	Author affiliation: Dept. of Chem. & Biomolecular Eng., Illinois Univ., Urbana, IL (Bhoj, A.N.)
Abstract	Summary form only given. Pulsed atmospheric pressure plasma discharges, such as corona and dielectric barrier devices, are commonly used to functionalize surfaces (e.g., polymer sheets). The surfaces of these materials have surface roughness of 100s nm to 10s mum often resulting from the manufacturing process. For example, polypropylene surfaces consist of random assemblies of crystalline strands with diameters of 100s nm. Porous materials and textiles also have highly non-planar surfaces. The penetration of plasma generated species (electrons, ions and radicals) into surface structures is of great interest when uniform functionalization of the surface is desired. In this paper, we discuss results from a computational multiscale investigation of atmospheric pressure plasma treatment of surfaces having microstructure. The investigation was conducted with a 2-dimensional plasma hydrodynamics model using an unstructured mesh capable of resolving a dynamic range of 1000 in spatial scale. This capability enables a multi-scale approach in which the reactor scale plasma hydrodynamics and penetration of plasma produced species into surface structures can be simultaneously addressed. A surface kinetics model is integrated with the plasma hydrodynamics model to assess the uniformity of treatment on the surface structures. Investigations were preformed for discharges in atmospheric pressure air and $He/O_{2}$ mixtures, the latter being for treating surfaces when nitrogen fixing is not desired. A typical treatment geometry consists of a dielectric barrier-corona with a gap of a few mm to the surface to be treated. Surface structures have characteristic dimensions of a few mum. We found that the uniformity of treatment of polymers such as polypropylene is sensitive to the gas mixture and polarity of the discharge pulses on both macroscopic (a few mm) and microscopic (<1 mum) scales. For example, the fraction of $O_{2},$ which in turn determines the rate of formation of $O_{3},$ can be used to optimize uniformity by controlling the rate of transport and reaction limited processes
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	276
Ending Page	276
File Size	1375060
Page Count	1
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359369
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atmospheric modeling Surface discharges Atmospheric-pressure plasmas Rough surfaces Surface roughness Surface treatment Surface structures Plasma materials processing Hydrodynamics Polymers
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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