Application of a Non-thermal Atmospheric Pressure Plasma Jet to the Decomposition of Salicylic Acid to Inorganic Carbon

Kuroda, Kosuke; Ishijima, Tatsuo; Kaga, Toshiki; Shiomomura, Kai; Ninomiya, Kazuaki; Takahashi, Kenji

doi:10.1246/cl.150656

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…We calculate the generated pressure from their device and the volume of their device. Their device generated 19 Pa per mm 3 , and our device generated 6.5 Pa per mm 3 . The ratio of generated pressure and volume of our device is slightly less than their one.…”

Section: ¹1mentioning

confidence: 75%

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Electrohydrodynamic Conduction Pump with Asymmetrical Electrode Structures in the Microchannels

Sato

Yamanishi

Cacucciolo³

et al. 2017

Chem. Lett.

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In this study, we have developed a microfluidic pump that utilizes the electrohydrodynamic (EHD) conduction of a working fluid. Ring-shaped pumps have been used in previous studies on EHD conduction, but these require a three-dimensional arrangement of electrode pairs, which makes it difficult to downsize the apparatus. Here, we propose a mechanism to achieve one-way fluid flow in the microchannels by arranging non-parallel electrodes in a plane to generate an asymmetric electric field. One advantage of this design is that it can be easily and precisely fabricated using microelectromechanical system (MEMS) processing techniques: this has allowed us to integrate a micropump and a microchannel into a single device. Moreover, the pressure generated by the pump is induced solely by electrochemical reactions; since mechanical components such as gears are not required, this helps reduce the noise generated by the device. The demand for small actuators is increasing due to the development of highly integrated electronics and the miniaturization of devices.1,2 The use of electrohydrodynamics (EHD), where a voltage is applied to induce the flow of a working fluid, may help reduce the size of actuators.3 In EHD, three forces are known to act directly on a fluid (unlike in electrophoresis where the forces act on dispersed particles in a fluid). These forces can be described by eq 1.Here, F is the electric body force, µ e is the charge density, E is the electric field magnitude, E is the electric field, ¾ is the permittivity, and µ is the mass density. The first term in the equation represents the Coulomb force acting on free charges in an electric field. The second and third terms represent the dielectrophoretic and electrostriction forces, respectively, which are polarization forces acting on polarized charges. The dielectrophoretic force acts on a permittivity gradient and does not exist for isothermal singlephase flow, and the electrostriction force is only applicable to compressible fluids. EHD phenomena can be divided into EHD conduction and EHD injection. It is known that EHD conduction occurs at less than 10 7 V m ¹1 . 4 EHD injection can produce large pressures, but can also lead to deterioration of the electrodes. Electrode deterioration is not a major issue for EHD conduction, and therefore this has attracted more research interest. Pearson and Seyed-Yagoobi have described the mechanism of EHD conduction as follows.5 When a high-voltage electric field is applied to a fluid, an equilibrium is achieved between the dissociation of some of the neutral species, AB, into ions (A + and B ¹ ), and recombination of the ions back into AB.When the voltage is increased above a certain threshold value, the rate of dissociation becomes faster than the rate of recombination, and the ions A + and B ¹ are attracted to the electrodes. As a result, the ions collide with the neutral AB species, and the fluid flows towards the electrodes.When EHD conduction is used for pumping, it is important to generate unidirectional flow by break...

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Section: ¹1mentioning

confidence: 75%

“…1,2 The use of electrohydrodynamics (EHD), where a voltage is applied to induce the flow of a working fluid, may help reduce the size of actuators. 3 In EHD, three forces are known to act directly on a fluid (unlike in electrophoresis where the forces act on dispersed particles in a fluid). These forces can be described by eq 1.…”

mentioning

confidence: 99%

Electrohydrodynamic Conduction Pump with Asymmetrical Electrode Structures in the Microchannels

Sato

Yamanishi

Cacucciolo³

et al. 2017

Chem. Lett.

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“…Lately, corona discharge with multipin‐to‐plate design was found to eliminate organic contaminants such as perfluorooctanoic acid 27, phenol 33, chloroform 34, and methylene blue 35. A few studies based on plasma have previously investigated the elimination of salicylic acid 36, 37. They found limitations such as the need for longer discharge times.…”

Section: Introductionmentioning

confidence: 99%

Salicylic Acid Elimination by Pulsed Corona Discharge Treatment of Wastewater

et al. 2021

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Elimination of salicylic acid by pulsed corona discharge in a multipin‐plate reactor was investigated. Corona discharge is an alternative technique that produces highly active species such as HO• that degrade salicylic acid. Salicylic acid was totally eliminated in 60 min of treatment with 200 stainless steel needles. Variables such as pH, initial concentration, conductivity, and Na2SO4 dosage were studied to elucidate their influence on salicylic acid elimination. Salicylic acid elimination increased with decreasing pH, initial concentration, and conductivity of the liquid.

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“…[24][25][26][27][28][29][30] In ILs, plasma techniques are popular for the synthesis of metal nanoparticles, [31] and there are several reports involving organic chemical reactions. [32] When chemically active species are generated in ILs, it is known that the ILs themselves can be converted to secondary active species such as the imidazolium radical, although this depends on the IL species.…”

Section: Introductionmentioning

confidence: 99%

Effective Dissolution of Biomass in Ionic Liquids by Irradiation of Non-Thermal Atmospheric Pressure Plasma

et al. 2017

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Biomass was dissolved in ionic liquids under non-thermal atmospheric pressure plasma irradiation. On plasma irradiation, the amount of dissolved biomass in the ionic liquids increased from 15 to 29 mg for bagasse and from 26 to 36 mg for Japanese cedar. The high solubility is attributed to the deconstruction of the lignin network by active chemical species generated by the plasma. Selective extraction of cellulose from biomass was observed under the plasma irradiation.

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Application of a Non-thermal Atmospheric Pressure Plasma Jet to the Decomposition of Salicylic Acid to Inorganic Carbon

Abstract: A non-thermal atmospheric pressure plasma jet technique was applied to decompose salicylic acid to inorganic carbon. Excess hydroxyl radical, which has a high oxidation potential, decomposed salicylic acid within 10 min, and total organic carbon decreased to 20% after 30 min.

Cited by 4 publications

References 26 publications

Electrohydrodynamic Conduction Pump with Asymmetrical Electrode Structures in the Microchannels

Electrohydrodynamic Conduction Pump with Asymmetrical Electrode Structures in the Microchannels

Salicylic Acid Elimination by Pulsed Corona Discharge Treatment of Wastewater

Effective Dissolution of Biomass in Ionic Liquids by Irradiation of Non-Thermal Atmospheric Pressure Plasma

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