Kotaro Shiraishi

Electroplated Fe films prepared from a deep eutectic solvent

Electroplating of Fe films was carried out from choline chloride-ethylene glycol types of DES (Deep Eutectic Solvent). We investigated magnetic properties of the plated Fe films and evaluated the productivity for the electroplating process. Consequently, we found that surface morphology and current efficiency of the plated films were affected by the bath temperature. We obtained the Fe films with relatively smooth surface and high current efficiency in the bath temperature range from 70 to 110 °C. The deposition rate for our process depended on the current density, and we obtained high deposition rate value of approximately 120 μm/h. We also obtained high current efficiency values of approximately 90% in the wide range of plating time. These results indicate that the DES-based bath has industrial advantages for mass-producing Fe films. Therefore, we conclude that the DES-based bath is an attractive plating bath for Fe films.

Electroplated Fe–Ni Films Prepared From Deep Eutectic Solvents

Fe-Ni alloy films were prepared by electroplating in a plating bath containing a choline chloride and ethylene glycol-based deep eutectic solvent (DES). The Fe content of the electroplated films was found to vary from 0 at.% to 100 at.% and was dependent on the amount of Fe reagent in the plating bath. The composition of the electroplated films could be controlled easily by changing the composition of the bath. We observed bcc or fcc Fe-Ni crystalline phase in the electroplated films by X-ray diffraction and confirmed that magnetically soft Fe-Ni alloy films could be obtained from the DES-based bath. The current efficiency for the plating process was as high as >88% over a wide range of the Fe reagent concentrations. Therefore, we conclude that the DES is an attractive solvent for preparing the Fe-Ni alloy films.

Electroplated Fe-Co-Ni films prepared from deep-eutectic-solvent-based plating baths

We fabricated soft magnetic films from DES-based plating baths, and investigated magnetic properties of the plated films. The plating baths were obtained by stirring the mixture of choline chloride, ethylene glycol, FeCl2 ⋅ 4H2O, NiCl2 ⋅ 6H2O and CoCl2 ⋅ 6H2O. The composition of the electroplated film depended on the amount of the reagent in the plating bath, and we consequently obtained the films with various composition. The current efficiency of the plating process shows high values (> 88 %) in the wide composition range. The soft magnetic films with low coercivity were obtained at the Fe compositions of ≈ 30 at.% and > 80 at.%, and we found that low coercivity could be realized by the control of the film composition. We also found that the Fe-rich films prepared from DES-based plating bath have some advantages as a soft magnetic phase for a nanocomposite magnet due to their high saturation magnetization and very fine crystal structure.

Magnetic Fe-Co films electroplated in a deep-eutectic-solvent-based plating bath

We fabricated Fe-Co films from a deep eutectic solvent (DES)-based plating bath and investigated magnetic properties of the plated films. The plating baths were obtained by stirring the mixture of choline chloride, ethylene glycol, FeCl2·4H2O, and CoCl2·6H2O. The composition of the plated films depended on the amount of FeCl2·4H2O in the plating bath, and Fe content of the films was varied from 0 to 100 at. %. Depending on the Fe content, the saturation magnetization and the coercivity of the films varied. The Fe76Co24 film shows high saturation magnetization and smooth surface, and the change in the saturation magnetization shows good agreement with the expected change by the Slater-Pauling curve. High current efficiency (>90%) could be obtained in the wide film composition. From these results, we concluded that the DES-based plating bath is one of effective baths for the Fe-Co films with high current efficiency.

Treatment for Chronic and Broad Osteomyelitis of Femor with Papineau's Method

今回我々は，長期間放置されていた大腿骨の慢性化膿性骨髄炎の3例に対し，Papineau法による治療を行い良好な治療成果が得られたので報告する．症例は男性2例，女性1例で，年齢は60歳～70歳（平均64.7歳）．骨髄炎罹患期間は23年～52年（平均38.0年）であった．第1相～第2相までの日数は平均47.3日，第2相～第3相までは平均28.0日で，入院期間は平均110.0日であった．病巣掻爬の範囲が約20cmに及ぶものが1例あったが，両側前後の腸骨からの骨移植でなんとか骨充填可能であった．第3相は3例とも創の縫縮のみで閉創可能で，再燃は認めていない．〈考察〉慢性化膿性骨髄炎に対してはPapineau法以外にもさまざまな治療法が施行されている．当院ではイリザロフによる仮骨延長法等も症例によっては施行しているが，患者の性格，年齢，罹患部位等を考慮すると，今回のようにPapineau法の有用性が改めて確認できた．