非集光管型および集光照射型の二種類の反応装置を用いて, 太陽光エネルギーを利用したTiO₂光触媒によるビスフェノールA (BPA) の分解反応を行った. 照射エネルギーに対する分解量の比から求めた見掛けの量子収率を比較した結果, 非集光管型反応装置の方が高エネルギー変換効率であることが分かった. 集光照射反応装置で変換効率が低い原因は, 照射光が直達光のみであり, 反射鏡による光の損失および過度の集光による高い放射照度が, 光触媒の電子, 正孔再結合を促進し, 反応を抑制したためであると考えられる. 0.1mMのBPA15Lを最適条件下 (管型反応装置流量: 7.2L/min, TiO₂: 28g) で太陽光を90分間照射した結果, 開環率100%, 無機化率 (TOC減少率) 95%で分解することができた.

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The physico-chemical interaction between hydrophobic polyolefin materials and originally hydrophilic inorganic nano-particles like surface hydroxylated SiO₂ has not been well understood up to now. In this study, the influences of particle size, content of hydrophilic SiO₂ nanoparticles on the isothermal growth rate of polypropylene (PP) spherulites in various PP/SiO₂ nanocomposites were investigated by polarized optical microscope equipped with temperature controlled hot stage. Moreover, photo-oxidative degradation behavior of the PP/ SiO₂ nanocomposites were investigated. It is most interesting to note that the addition of smaller SiO₂ nanoparticles effectively lowered the growth rate of PP spherulites in the composites and the spherulite growth rate became zero for the PP/16nm-SiO₂ nanocomposites with the SiO₂ content above 2.5 wt%. It was found that the sample without spherulite morphology is more stable to photo-degradation. Spherulite structure is considered to have the influence affect photo-oxidative degradation.

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This paper describes the effects of polyethylene glycol (PEG) derivatives on copper electroplating. α, ω-Diphenylazophenoxy polyethylene glycol (PEG-Az) of the novel PEG derivative provides interesting results, suppressing copper deposition during copper electroplating. We found that PEG-Az suppresses copper deposition without the chlorideion (Cl-ion). To determine the reason for this action, we carried out linear sweep voltammetry (LSV), glow discharge optical emission spectroscopy (GDOES), and electrochemical quartz crystal microbalance (EQCM) measurements for the plating bath containing PEG-Az. PEG-Az was found to be a stronger suppression effect than the PEG even without the Cl-ion.

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