scholarly journals The influence of metastable species and rotational quantum numbers on the derivation of OH (A– X), NO-γ (A–X) and N2 (C–B) bands rotational temperatures in an argon gas-liquid-phase plasma discharge

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Hafiz Imran Ahmad Qazi ◽  
Jian-Jun Huang
Keyword(s):  
Liquid Phase ◽  
Plasma Discharge ◽  
Argon Gas ◽  
Quantum Numbers ◽  
Liquid Phase Plasma

Highly Efficient Biodiesel Conversion from Soybean Oil Using Liquid-Phase Plasma Discharge Technology

2019 ◽  
Vol 62 (5) ◽  
pp. 1129-1134 ◽  
Author(s):  
Sarah Wu ◽  
Muhammad Aamir Bashir ◽  
Hsiang Hsieh ◽  
Anilkumar Krosuri ◽  
Armando McDonald
Keyword(s):  
Reaction Time ◽  
Liquid Phase ◽  
Soybean Oil ◽  
Applied Voltage ◽  
Plasma Discharge ◽  
Optimal Combination ◽  
Operating Parameters ◽  
Dielectric Plate ◽  
Molar Ratios ◽  
Liquid Phase Plasma

Abstract. In this study, the use of liquid-phase plasma discharge (LPPD) technology to accelerate the transesterification process was explored. An innovative LPPD reactor was first evaluated by varying the conductive opening size on the dielectric plate (0.75, 1.0, and 1.25 mm) coupled with five methanol to oil molar ratios (MOMR; 3, 4, 5, 6, and 7) and two liquid flowrates through the reactor (2.7 and 4.1 mL s-1) at a given catalyst (NaOH) to oil ratio (NaOR) of 0.8% (w/w). The optimal combination of opening size (1.0 mm), MOMR (5), and flowrate (2.7 mL s-1) was then fixed while the NaOR was varied from 0.4% to 1.2% (w/w) in 0.2% increments to determine the best NaOR for the reactor. The results showed that the best combination of the four operating parameters was an opening size of 1.0 mm, MOMR of 5, liquid flowrate of 2.7 mL s-1, and NaOR of 0.6% (w/w), with which a biodiesel conversion rate of 99.5% was obtained at an applied voltage of 1.2 kV. The transesterification reaction time was found to be only 923 ms. The developed LPPD technology has potential to position biodiesel competitively against petroleum diesel. Keywords: Biodiesel conversion, Liquid-phase plasma discharge, Soybean oil, Transesterification

scholarly journals Surface biofunctionalization with liquid-phase plasma treatment of collagen molecules

2021 ◽  
Author(s):  
Shiori Tanaka ◽  
Shingo Kanemura ◽  
Masaki Okumura ◽  
Kazuyuki Iwaikawa ◽  
Kenichi Funamoto ◽  
...  
Keyword(s):  
Surface Modification ◽  
Liquid Phase ◽  
Plasma Treatment ◽  
Conformational Changes ◽  
Plasma Discharge ◽  
Technical Limitation ◽  
Protein Molecules ◽  
Collagen Molecules ◽  
Versatile Technique ◽  
Liquid Phase Plasma

Abstract Surface functionalization is a key process in rendering various materials biocompatible. Whereas a number of techniques and technologies have been developed for the purpose of biofunctionalization, plasma treatment enables highly efficient surface modification. Extending plasma treatment to biomolecules in the liquid phase will control biofunctionalization via a simple process. However, interactions between plasma discharge and biomolecules or solvents are poorly understood, potentially leading to the technical limitation as to the utility of plasma treatment. In this study, we developed a technology for substrate biofunctionalization that does not require surface modification but involves direct treatment of a collagen molecules with liquid-phase plasma discharge. Biofunctionalization of collagen by plasma treatment comprises three processes that increase its reactivity with hydrophobic substrates: (1) charge-dependent changes in surface and interfacial properties of the collagen solution; (2) local conformational changes of the collagen molecules without their global structural alterations; and (3) induction of a micelle-like association formed by collagen molecules. We anticipate such plasma-induced functionalization of protein molecules to provide a versatile technique in the applications of biomaterials, including those related to pharmaceuticals and cosmetics.

Optimization of a novel liquid-phase plasma discharge process for continuous production of biodiesel

2019 ◽  
Vol 228 ◽  
pp. 405-417 ◽  
Author(s):  
Sarah Wu ◽  
Shaobo Deng ◽  
Jun Zhu ◽  
Muhammad Aamir Bashir ◽  
Forrest Izuno
Keyword(s):  
Liquid Phase ◽  
Continuous Production ◽  
Plasma Discharge ◽  
Discharge Process ◽  
Liquid Phase Plasma

scholarly journals Surface biofunctionalization with liquid-phase plasma treatment of collagen molecules

2021 ◽  
Author(s):  
Shiori Tanaka ◽  
Shingo Kanemura ◽  
Masaki Okumura ◽  
Kazuyuki Iwaikawa ◽  
Kenichi Funamoto ◽  
...  
Keyword(s):  
Surface Modification ◽  
Liquid Phase ◽  
Plasma Treatment ◽  
Conformational Changes ◽  
Plasma Discharge ◽  
Technical Limitation ◽  
Protein Molecules ◽  
Collagen Molecules ◽  
Versatile Technique ◽  
Liquid Phase Plasma

Abstract Surface functionalization is a key process in rendering various materials biocompatible. Whereas a number of techniques and technologies have been developed for the purpose of biofunctionalization, plasma treatment enables highly efficient surface modification. Extending plasma treatment to biomolecules in the liquid phase will control biofunctionalization via a simple process. However, interactions between plasma discharge and biomolecules or solvents are poorly understood, potentially leading to the technical limitation as to the utility of plasma treatment. In this study, we developed a technology for substrate biofunctionalization that does not require surface modification but involves direct treatment of a collagen molecules with liquid-phase plasma discharge. Biofunctionalization of collagen by plasma treatment comprises three processes that increase its reactivity with hydrophobic substrates: (1) charge-dependent changes in surface and interfacial properties of the collagen solution; (2) local conformational changes of the collagen molecules without their global structural alterations; and (3) induction of a micelle-like association formed by collagen molecules. We anticipate such plasma-induced functionalization of protein molecules to provide a versatile technique in the applications of biomaterials, including those related to pharmaceuticals and cosmetics.

SYNTHESIS OF HYDROGEN IN ACOUSTOPLASMA DISCHARGE IN A LIQUID-PHASE STREAM

2019 ◽  
pp. 42-48 ◽  
Author(s):  
N. A. Bulychev
Keyword(s):  
Liquid Phase ◽  
Organic Compounds ◽  
Electrode Materials ◽  
Solid Phase ◽  
Plasma Discharge ◽  
Raw Material ◽  
Two Phase ◽  
Reduced Pressure ◽  
External Power Source ◽  
Phase Medium

In this paper, the plasma discharge in a high-pressure fluid stream in order to produce gaseous hydrogen was studied. Methods and equipment have been developed for the excitation of a plasma discharge in a stream of liquid medium. The fluid flow under excessive pressure is directed to a hydrodynamic emitter located at the reactor inlet where a supersonic two-phase vapor-liquid flow under reduced pressure is formed in the liquid due to the pressure drop and decrease in the flow enthalpy. Electrodes are located in the reactor where an electric field is created using an external power source (the strength of the field exceeds the breakdown threshold of this two-phase medium) leading to theinitiation of a low-temperature glow quasi-stationary plasma discharge.A theoretical estimation of the parameters of this type of discharge has been carried out. It is shown that the lowtemperature plasma initiated under the flow conditions of a liquid-phase medium in the discharge gap between the electrodes can effectively decompose the hydrogen-containing molecules of organic compounds in a liquid with the formation of gaseous products where the content of hydrogen is more than 90%. In the process simulation, theoretical calculations of the voltage and discharge current were also made which are in good agreement with the experimental data. The reaction unit used in the experiments was of a volume of 50 ml and reaction capacity appeared to be about 1.5 liters of hydrogen per minute when using a mixture of oxygen-containing organic compounds as a raw material. During their decomposition in plasma, solid-phase products are also formed in insignificant amounts: carbon nanoparticles and oxide nanoparticles of discharge electrode materials.

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