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Multiscale simulation of atmospheric...

Bhoj, Ananth N.

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Multiscale simulation of atmospheric pressure pulsed discharges used in polymer surface functionalization.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Multiscale simulation of atmospheric pressure pulsed discharges used in polymer surface functionalization./
Author:	Bhoj, Ananth N.
Description:	312 p.
Notes:	Adviser: Mark J. Kushner.
Contained By:	Dissertation Abstracts International68-06B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3269841
ISBN:	9780549091936

Multiscale simulation of atmospheric pressure pulsed discharges used in polymer surface functionalization.
Bhoj, Ananth N.

Multiscale simulation of atmospheric pressure pulsed discharges used in polymer surface functionalization. - 312 p.

Adviser: Mark J. Kushner.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.

Atmospheric pressure pulsed plasma discharges are widely used for surface functionalization or treatment of commodity polymers to improve properties such as adhesion and wettability. Newer applications include textile fabric treatment to improve color fastness and biomedical surface functionalization. In this work, an unstructured mesh-based two-dimensional Plasma Equipment Model (PEM) was developed to investigate the physical and chemical processes in these discharges, which occur on temporal and spatial scales spanning many orders of magnitude and affect their interaction with polymer surfaces. Better insight into these processes will enable the tailoring and optimization of processing conditions.

ISBN: 9780549091936Subjects--Topical Terms:

1018531
Engineering, Chemical.

Multiscale simulation of atmospheric pressure pulsed discharges used in polymer surface functionalization.
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020 $a 9780549091936
035 $a (UMI)AAI3269841
035 $a AAI3269841
040 $a UMI $c UMI
100 1 $a Bhoj, Ananth N. $3 1269330
245 1 0 $a Multiscale simulation of atmospheric pressure pulsed discharges used in polymer surface functionalization.
300 $a 312 p.
500 $a Adviser: Mark J. Kushner.
500 $a Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 3952.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
520 $a Atmospheric pressure pulsed plasma discharges are widely used for surface functionalization or treatment of commodity polymers to improve properties such as adhesion and wettability. Newer applications include textile fabric treatment to improve color fastness and biomedical surface functionalization. In this work, an unstructured mesh-based two-dimensional Plasma Equipment Model (PEM) was developed to investigate the physical and chemical processes in these discharges, which occur on temporal and spatial scales spanning many orders of magnitude and affect their interaction with polymer surfaces. Better insight into these processes will enable the tailoring and optimization of processing conditions.
520 $a Transient phenomena (time variation of plasma properties) during breakdown in atmospheric pressure discharges are addressed, since the spatial distribution of radicals generated in the discharge is determined by the dynamics of breakdown. The breakdown dynamics is governed by a multitude of physical and chemical processes such as reaction kinetics, photoionization, electron energy transport, charged species and neutral transport. The ability to address non-equilibrium electron energy transport in plasma discharges was developed by enhancing an existing electron Monte-Carlo simulation to address multiple regions of nonequilibrium, and was demonstrated for breakdown in high pressure discharges.
520 $a A high degree of uniformity in surface treatment is important for value-added materials. Increasing the proximity of reactive plasma produced species to the surface enables better uniformity, especially with polymers having complex surface shapes. The propagation of atmospheric pressure discharges in microchannels, such as those used in lab-on-a-chip devices was investigated to determine the possibility of producing reactive gas-phase radicals within small spaces, close to the surfaces requiring treatment.
520 $a An integrated surface kinetics module was developed to address the cumulative surface treatment of polypropylene with microstructure, such as rough and porous surfaces, in repetitively pulsed O2 and NH3 containing discharges. Parameters such as gas composition, humidity, discharge polarity and applied power regulate the transport and reaction processes that ultimately affect the relative abundance and uniformity of various O and N surface functional groups. Electrons may penetrate gaps in the microstructure depending on discharge polarity and surface charging dynamics. The penetration of positive ions is limited due to ambipolar effects. Higher radical densities are produced near spaces in the microstructure in negative discharges. While reactive radicals are consumed here, slow-reacting radicals diffuse deeper into these spaces, treating surfaces not directly in the line-of-sight of the discharge over time. Photons generated in the discharge react with surface sites in the line-of-sight, increasing spatial nonuniformity in functionalization.
520 $a An integrated incompressible fluid dynamics model was developed to investigate the impact of gas flow on radical generation and surface treatment. Convective gas flow alters the relative abundance of reactive species in the discharge that affects the surface composition. Continuous surface processing was simulated, wherein radicals formed on the polymer move out of the discharge zone but continue to react downstream. Changes in gas composition affect the relative importance of local reaction kinetics and convective transport of reactive species in the discharge.
590 $a School code: 0090.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0542
690 $a 0759
710 2 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 68-06B.
790 $a 0090
790 1 0 $a Kushner, Mark J., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3269841