Characterization of atmospheric pressure microplasma produced from argon and a mixture of argon–ethylenediamine

Bashir, Muhammad; Rees, Julia M.; Bashir, Shazia; Zimmerman, William B.

doi:10.1016/j.physleta.2014.05.049

Cited by 41 publications

(27 citation statements)

References 35 publications

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“…Figure A shows the emission spectrum of argon discharge containing vapors of acrylic acid monomer at a flow rate of 10 sccm. The emission bands were recognized and assigned using references from previous studies and the data obtained form the web site of the National Institute of Standards and Technology (NIST) . The peaks of OH (309 nm), N 2 (337‐379 nm), Ar (405 nm), and Ar band (695‐850 nm) were noticed in the emission spectrum of plasma.…”

Section: Resultsmentioning

confidence: 99%

“…, Optical emission spectrum of argon plasma containing vapors of acrylic acid monomer at a flow rate of 10 sccm. B, Variation in the emission intensities of OH and CO peaks as a function of monomer flow rate at a constant discharge power of 25 W nized and assigned using references from previous studies22,23 and the data obtained form the web site of the National Institute of Standards and Technology (NIST).24 The peaks of OH (309 nm), N 2 (337-379 nm), Ar (405 nm), and Ar band (695-850 nm) were noticed in the emission spectrum of plasma. The emission of CO (457 nm) was observed in the spectrum when the monomer vapors were added to the Ar plasma to obtain deposition.…”

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confidence: 99%

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Deposition of polyacrylic acid films on PDMS substrate in dielectric barrier corona discharge at atmospheric pressure

Bashir

Khan

2018

Surface & Interface Analysis

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This paper reports on deposition of acrylic acid films polymerized by an efficient and cost‐effective technique of dielectric barrier corona discharge at atmospheric pressure. The liquid acrylic acid was vaporized and carried by argon gas into plasma to deposit polyacrylic acid films on polydimethylsiloxane substrate. A nonthermal corona discharge was generated in a pyrex flask using a steel tube‐to‐plate asymmetric electrode configuration. The plasma was excited using an in‐house developed power supply operating with continuous wave signals of 10‐kHz frequency. The emission spectra of plasma species were recorded to know their contribution during deposition process. The deposited surfaces were characterized using contact angle measurements, atomic force microscopy, Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy and film thickness measurements. A maximum film growth rate of 363 nm/min was achieved under optimal condition of discharge. The results suggest that this plasma technique is capable of depositing organic coatings with a high concentration of carboxylic functional groups that could be potentially used for biomedical and microfluidic applications.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Deposition of polyacrylic acid films on PDMS substrate in dielectric barrier corona discharge at atmospheric pressure

Bashir

Khan

2018

Surface & Interface Analysis

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“…In such case, as can be seen from equation (1), the total intensity is given for both vibrational and rotational levels. To deduce the vibrational temperature, we can use the vibrational dependent portion as follows [16,17]: …”

Section: Vibrational Temperaturementioning

confidence: 99%

Experimental and theoretical study on emission spectra of a nitrogen photoionized plasma induced by intense EUV pulses

Saber

Bartnik

Skrzeczanowski

et al. 2018

EPJ Web of Conferences

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Abstract. Spectral lines of low-temperature nitrogen photoionized plasma were investigated. The photoionized plasma was created in the result of irradiation N 2 gas using laser plasma EUV radiation pulses. The source was based on a 10J/10ns Nd:YAG (λ = 1064 nm) laser system and a gas puff target. The EUV radiation pulses were collected and focused using a grazing incidence multifoil EUV collector. The emission spectra were measured in the ultraviolet and visible (UV/Vis) range. It was found that the plasma emission lines in the lower region of the UV range are relativley weak. Nonetheless, a part of the spectra contains strong molecular band in the 300 -430 nm originated from second positive and first negative systems band transitions of nitrogen. These molecular band transitions were identified using a code for study the diatomic molecules, LIFBASE. The vibrational band of ∆v = 0 and ±1 transitions were significantly populated than of that with ∆v = ±2 and 3 transitions. A comparison of the calculated and measured spectrum is presented. With an assumption of a local thermodynamic equilibrium (LTE), the vibrational temperature was determined from the integrated band intensities with the help of the Boltzmann plot method and compared to the temperature predicted by SPECAIR and LIFBASE simulations. A summary of the results and the variations in the vibrational temperatures was discussed.

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“…Arc plasma quickly damages the PDMS surface. Therefore, atmospheric pressure plasmas at low frequencies need at least one of the electrodes covered with a dielectric barrier in order to generate a homogenous and stable glow discharge [39][40][41]. In this work, an efficient and long lasting method is demonstrated for localized plasma-initiated acrylic acid polymerization on bonded PDMS microchannels using atmospheric pressure dielectric barrier corona discharge.…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic Surface Modification of PDMS Microchannel for O/W and W/O/W Emulsions

Bashir

Solvas

et al. 2015

Micromachines

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A surface modification method for bonded polydimethylsiloxane (PDMS) microchannels is presented herein. Polymerization of acrylic acid was performed on the surface of a microchannel using an inline atmospheric pressure dielectric barrier microplasma technique. The surface treatment changes the wettability of the microchannel from hydrophobic to hydrophilic. This is a challenging task due to the fast hydrophobic recovery of the PDMS surface after modification. This modification allows the formation of highly monodisperse oil-in-water (O/W) droplets. The generation of water-in-oil-in-water (W/O/W) double emulsions was successfully achieved by connecting in series a hydrophobic microchip with a modified hydrophilic microchip. An original channel blocking technique to pattern the surface wettability of a specific section of a microchip using a viscous liquid comprising a mixture of honey and glycerol, is also presented for generating W/O/W emulsions on a single chip.

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Characterization of atmospheric pressure microplasma produced from argon and a mixture of argon–ethylenediamine

Cited by 41 publications

References 35 publications

Deposition of polyacrylic acid films on PDMS substrate in dielectric barrier corona discharge at atmospheric pressure

Deposition of polyacrylic acid films on PDMS substrate in dielectric barrier corona discharge at atmospheric pressure

Experimental and theoretical study on emission spectra of a nitrogen photoionized plasma induced by intense EUV pulses

Hydrophilic Surface Modification of PDMS Microchannel for O/W and W/O/W Emulsions

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