Polymeric Coatings Deposited From an Aerosol‐Assisted Non‐thermal Plasma Jet

O’Neill, Liam; O’Sullivan, Caroline

doi:10.1002/cvde.200806699

Cited by 18 publications

(31 citation statements)

References 19 publications

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“…Both of which have not been reported before. These measurements allow the reported plasma processing outcome [12][13][14][15][16][17][18][19] to be revaluated in terms of discharge power and heat transfer. Outside the nozzle the gas temperature drops towards the surface to such a degree that allows heat sensitive treatment of polymeric and composite materials and many medical applications.…”

Section: Discussionmentioning

confidence: 99%

“…The working gas is injected between the needle electrodes and flows out through the quartz tube nozzle. A corona plasma discharge is produced whose visual morphology varies with gas flow [14,18]. The helium flow rate of 1-10 standard litres per minute (slm) is controlled using manual valved rotameters.…”

Section: Atmospheric Pressure Plasma Jetmentioning

confidence: 99%

“…In previous studies the plasma jet electrical parameters have been reported as either a percentage of power [18], or simply as a fixed voltage [25]. As the initial breakdown produces a corona discharge and then proceeds to a uniform volume discharge at higher powers and higher helium flow rate, understanding the electrical and gas flow dynamics is critical to assist in the control of the plasma deposition process [14-18, 24, 25].…”

Section: Electrical Measurementsmentioning

confidence: 99%

“…The main difference between this system and the plasma needle, pencil and microplasma jet systems is the electrode structure, the increased electrode to treated surface distance and the increased nozzle area. Amongst the applications reported to-date of this source are: enhancing silicone adhesion to steel [14,15], control of cell adhesion [16] and the deposition of plasma polymerized coatings [17,18]. From these studies it has been concluded that parameters such as applied power and the gap distance between the substrate and the jet nozzle significantly influence deposited coating properties.…”

Section: Introductionmentioning

confidence: 99%

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Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Nwankire

Law

Nindrayog³

et al. 2010

Plasma Chem Plasma Process

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Plasma diagnostics of atmospheric plasmas is a key tool in helping to understand processing performance issues. This paper presents an electrical, optical and thermographic imaging study of the PlasmaStream atmospheric plasma jet system. The system was found to exhibit three operating modes; one constricted/localized plasma and two extended volume plasmas. At low power and helium flows the plasma is localized at the electrodes and has the electrical properties of a corona/filamentary discharge with electrical chaotic temporal structure. With increasing discharge power and helium flow the plasma expands into the volume of the tube, becoming regular and homogeneous in appearance. Emission spectra show evidence of atomic oxygen, nitric oxide and the hydroxyl radical production. Plasma activated gas temperature deduced from the rotational temperature of nitrogen molecules was found to be of order of 400 K: whereas thermographic imaging of the quartz tube yielded surface temperatures between 319 and 347 K.

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Section: Discussionmentioning

confidence: 99%

Section: Atmospheric Pressure Plasma Jetmentioning

confidence: 99%

Section: Electrical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Nwankire

Law

Nindrayog³

et al. 2010

Plasma Chem Plasma Process

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“…A plasma jet was constructed based on the aerosol-plasma jet system described by O'Neill and O'Sullivan [10]. It consists of a dielectric head housing two tungsten needle pointed electrodes to which are applied in parallel an alternating current voltage.…”

Section: Methodsmentioning

confidence: 99%

A direct comparison between gas state and atomised liquid state precursor in the deposition of functional coatings by pin corona plasma

Herbert¹,

Jaroszyńska-Wolińska

2011

Eur. Phys. J. Appl. Phys.

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An atmospheric pressure non-thermal equilibrium pin corona plasma jet was used to deposit polymeric coatings from monomer precursor in both vapour and liquid aerosol states to allow a direct comparison of the quality and performance of the as-deposited coatings, specifically with respect to the achievement of soft plasma polymerisation (SPP) where the coating exhibits minimal fragmentation or damage to the monomer molecule while, at the same time, being highly cross-linked. A long chain perfluorocarbon molecule was introduced into the helium plasma and coatings deposited at rates of up to 50 nm/min. XPS, FTIR, contact angle and ellipsometric measurements indicated that a controlled polymerization reaction had taken place in the case of the vapour deposited samples through the vinyl group of the monomer, with only minor fragmentation of the functional perfluoro chain. Furthermore, a high level of cross-linking was achieved and the coatings were stable to a toluene wash. In contrast, while the liquid deposition samples showed good retention of monomer molecular structure, they exhibited negligible cross-linking and were readily removed by immersion in toluene rendering them functionally useless.

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The effect of plasma‐polymerised silicon hydride‐rich polyhydrogenmethylsiloxane on the adhesion of silicone elastomers

Nwankire

Ardhaoui

Dowling

2009

Polymer International

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BACKGROUND: Silicone elastomers have outstanding material properties including good thermal stability, low electrical conductivity, biocompatibility and resilient physical and chemical properties. These elastomers, however, exhibit relatively poor adhesion to stainless steel, and the use of a nanometre thick plasma‐polymerised primer layer as a means of enhancing this adhesion was investigated in this study. The primer coatings studied consisted of polyhydrogenmethylsiloxane (PHMS), tetraethyl orthosilicate (TEOS) and mixtures of these two liquid precursors. RESULTS: The plasma‐polymerised primer coatings were deposited onto stainless steel substrates using a PlasmaStream™ atmospheric pressure plasma jet system. Deposited coatings were examined using ellipsometry, contact angle measurements, optical profilometry, Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy and scanning electron microscopy. The adhesion of silicone elastomers bonded to the primed and bare stainless steel surfaces was assessed using 45° adhesion strength measurements. Elastomer adhesion was correlated with surface energy, thickness and roughness. CONCLUSION: An up to 15‐fold increase in adhesive fracture energy was observed for silicone elastomers bonded to the primed versus untreated stainless steel. The highest adhesion was observed for a coating deposited from a PHMS‐to‐TEOS precursor molar ratio of 3 to 1. Copyright © 2009 Society of Chemical Industry

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Polymeric Coatings Deposited From an Aerosol‐Assisted Non‐thermal Plasma Jet

Cited by 18 publications

References 19 publications

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

A direct comparison between gas state and atomised liquid state precursor in the deposition of functional coatings by pin corona plasma

The effect of plasma‐polymerised silicon hydride‐rich polyhydrogenmethylsiloxane on the adhesion of silicone elastomers

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