Katsuhiko Hosoi's research while affiliated with Chiyoda Corporation and other places
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Publications (17)
Polytetrafluoroethylene (PTFE) has many excellent engineering applications for its great properties. We investigated the surface of the PTFE membranes treated with atmospheric pressure low temperature plasma in Ar and Ar/H2 to confirm the effectiveness for introducing functional groups as surface modifications. From the results of attenuated total...
The non-equilibrium atmospheric pressure Ar plasma was applied to the polymerization of maleic anhydride (MA). The deposited films were analyzed by using Fourier transform infrared spectroscopy (FT-IR) proving the monomer was successfully polymerized with retaining the functional groups. The intensity of optical emission spectroscopy (OES) of the p...
In this study, functional-group-retaining polymerization of hydroxyethyl methacrylate (HEMA) was carried out by using an atmospheric pressure non-equilibrium Ar plasma jet. The polymeric films deposited under different conditions were characterized by Fourier transform infrared spectroscopy (FT-IR). The FT-IR spectra show that HEMA was polymerized...
In this study, a 35-μm-thick copper sub-micron paste (particle diameter of 700 - 900 nm) was printed on an alumina substrate, and then sintered by conventional heating treatment and by atmospheric pressure plasma (APP) treatment, respectively. Surface micro-structures of the printed films sintered by both methods were observed by SEM. As a result,...
A non-equilibrium atmospheric pressure plasma was applied for the polymerization of the methacrylic monomers such as (2-hydroxyethyl methacrylate (HEMA), methacrylic acid (MAA) and butyl methacrylate (BMA)). These monomers were successfully polymerized with retaining the functional groups of ester or acid. The polymerization mechanism was discussed...
In this study, a high-density polyethylene (HDPE, 5-mm-thick, 0.95 g/cm3) surface was treated using an RF capacitive atmospheric pressure cold Ar plasma jet. By using this Ar plasma jet, a hydrophilic HDPE surface was formed during the plasma treatment. In particular, the effects of an additive gas (N2 or O2) on the HDPE surface treatment were inve...
Non-equilibrium atmospheric pressure plasma jet was used to reduce and sinter copper nano-particles. Optical emission spectroscopy (OES) and digital phosphor oscilloscope were used to characterize plasma used in this study. The treated samples were analyzed by X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM), besides th...
In this study, we conducted experiments to investigate the effectiveness of a non-equilibrium Ar-N2 plasma jet generated by a Cold Atmospheric Pressure Plasma Torch (CAPPLAT) at a sinusoidal voltage of 20 kV, frequency of 30 kHz with 10 slm of Ar gas and 100 sccm of N2 gas. Highly environmental stress resistant bacterial endospores of Bacillus subt...
In this study, we conducted experiments to investigate the electrical and optical characteristics of a non-equilibrium Ar-N-2 plasma discharge at atmospheric pressure. To obtain the plasma discharge we used our indigenously designed plasma generating device named CAPPLAT (Cold Atmospheric Pressure Plasma Torch) which was manufactured by Cresur Corp...
Electrical and optical properties of an argon plasma jet were characterized. In particular, effects of an additive gas, namely nitrogen or oxygen, on these properties were studied in detail. The plasma jet was found to be of a glow-like discharge, which scarcely changed upon the injection of an additive gas, either directly or through a glass capil...
The carbon nanotube and carbon nanoparticle that contain fluorine on their surfaces were prepared by a pulsed electric discharge in a fluorine-containing organic liquid. The dominant product was nanoparticles with the diameters of ca. 5–100 nm in all experiments, however, the intensity ratio of G-band (1580 cm-1) to D-band (1350 cm-1) of the Raman...
The carbon nanotube and carbon nanoparticle that contain fluorine on the surface were prepared by the pulsed electric discharge in fluorine-containing organic liquid. The production rate of carbon nanostructures by this method was found to be about 50 times faster than that by the "arc in liquid" method previously reported.
Proton exchange membranes for use in fuel cells were prepared by our original ion-track technology, which involves (i) the swift heavy ion irradiation of polyvinylidene fluoride films and subsequent chemical etching to obtain cylindrical pores, and (ii) the filling of proton-conducting polymer chains into the etched pores by γ-ray-induced graft pol...
Carbon nanotubes (CNTs) were synthesized from fine three-layered copolymer microspheres using the polymer blend technique. Diameter of PMMA core/Poly(AN-co-MMA) shell-1/PMMA shell-2 microspheres, prepared by a radical soap-free emulsion polymerization of methylmethacrylate (MMA) and acrylonitrile (AN), was between 400 nm and 500 nm. Microspheres we...
Precipitation polymerization of acrylonitrile in aqueous phase was performed in the presence of submicrometer-sized poly(methyl methacrylate) (PMMA) seed particles. The resulting PMMA/polyacrylonitrile (PAN) composite latex particles showed a novel well-defined surface morphology like rambutan. The formation of such surface structure was ascribed t...
Carbon nanotubes prepared from core-shell polymer particles are reported. As depicted in the Figure, polymethylmethacrylate (PMMA) core/polyacrylonitrile (PAN) shell microspheres are blended with a PMMA matrix, spun, and elongated. Then the shell is stabilized and finally carbonized to produce contaminant-free carbon nanotubes.
Multi-wall carbon nanotubes (CNTs) with diameters between 10 nm and 20 nm were prepared by melt spinning, stabilizing and carbonizing of fine core/shell-1/shell-2 polymer microspheres. Microspheres were synthesized by three-steps soap free emulsion polymerization of methylmetacrylate (MMA) and acrylonitrile (AN) using potassium persulfate (KPS) as...
Citations
... To deposit pp coatings with siloxane backbone, precursors such as hexamethyldisiloxane (HMDSO), octamethylcyclotetrasiloxane and tetraethoxysilane have been used [4][5][6][7][8][9][10]. Deposition of coatings with an aliphatic backbone was studied using precursors like acetylene and methyl methacrylate [11][12][13][14]. ...
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... The most popular synthesis approach of ion-conductive membranes based on track membranes is the radiation grafting of styrene in the latent track of films treated with a flow of heavy ions followed by polystyrene sulfonation [15][16][17][18]. This approach is based on the post-effect and consists in initiating the copolymerization of styrene by trapped radicals in the structure of irradiated (not having been etched) films. ...
... This guarantees the stability of the discharge system and satisfies the high activation effect of reactive species. The produced plasma can kill bacteria in open space, and it particularly overcomes the limitation of the discharge space of the dielectric barrier plate discharge system [12]. Furthermore, because AC power is used for APPJs, the system is simpler than laser and microwave discharge devices. ...
... It is known that the treatment temperature plays an important role in the HDPE surface treatment. When the treatment temperature is close to the melting point of the polymer, surface molecular motion is not negligible [67] and promotes chemical reactions. Additionally, the reactivity of the oxidizing species at the polymer surfaces increases exponentially with the temperature. ...
... Our previous study had revealed that the formation rate was very fast in the discharging of fluorine-containing organic liquid [19]. Moreover, it was found that the crystallinity of products was also influenced by the electric discharge frequency and discharge time. ...
... Thus, a greater than 0.5 % O2 addition to Ar CAPJ decreased bacterial inactivation efficacy.Similarly, a significant increase in the intensity of N2 species with adding 0.5 % air to Ar might be attributed to a rise in bacterial inactivation by CAPJ. The presence of N2 in the discharge quenches the Ar metastable state67,68,69 , which contributed to decreasing intensity of Ar I and OH• species. Although a similar intensity of N2 was observed at 0.5 and 1.0 % air addition to Ar, lower bacterial inactivation was observed in the latter case (seefig 7 and10).The discharge chemistry of He CAPJ differs from Ar CAPJ, which also influences antimicrobial effectiveness. ...
... At 25 C, paper fibers of 1.0 g were introduced into 100 ml PMMA microparticles solution (200 mg/L) and sealed with plastic wrap. UV spectrophotometric measurements were performed at specific time intervals (5,10,15,20,25,30,35,40,45,50, 60, 120, 180, 240, 300, 360, 480, and 600 min). The amount of PMMA microparticles adsorbed at time t, Q t (mg/g) was calculated with the following equation (Equation 2): ...
... Waterborne polymer nanocomposites are of increasing interest as a base for fabrication of hybrid materials with tailored features of nanoscale dimensional characteristics that enhance material properties and performance [6][7][8]. Among the techniques employed for the synthesis of waterborne polymer nanocomposites, emulsion and miniemulsion polymerization are the most used [9,10]. ...
... These nanotubes can be deposited on substrates by different methods such as the vaporization of a carbon target, 11-13 the use of solar energy for vaporization, 14 electric arc discharge, 15 electrolysis, 16 17 chemical vapor deposition, 18 sonochemical production, 19 low-temperature solid pyrolysis, 20 catalyst arrays, 21 and synthesis from polymers. 22 ...
... MWCNTs have higher diameters than SWCNTs, so the light absorption of MWCNTs but not their conductivity can be higher than that of SWCNTs. The length of CNTs also affects the transparency and conductivity; longer CNTs can have higher conductivity than shorter ones at the same transparency level due to the lower contact resistance, [36][37][38] as the long tubes make less contact. ...
