This paper reports the pH effect of reduced graphene oxide (RGO) colloids on formation of three dimensional (3D) graphene network in nucleate boiling condition, so called boiling method. When nucleated bubbles grow on the hot surface, thin liquid film beneath the bubble is supposed to be dried, in which RGO flakes become close to each other and form a structure. Accordingly, what happened when they are in high particle density would be a key issue for the formation of 3D graphene network. Here, we changed pH and oxidation level of RGO colloids so that their effect was observed on extent of 3D graphene network after boiling method. As pH was lower, i.e. being acid, the RGO colloids become unstable, resulting in 3D structure rather than 2D structure. Similarly, As oxidation level was lower, i.e. being more reduced, it showed a tendency to form 3D structure.

日本語教育において、ビジネス日本語は知らない場面・語彙・文型が 多く、覚えて、練習するだけの場合が多いのではないか。より深い理解 を得るために、依頼表現に限定して、ブラウン＆レヴィンソンのネガ ティブ・ポライトネスのストラテジーを利用して分析した。その結果、 10あるストラテジーのうち、4つのストラテジーがよく使われていること がわかった。FTAとの関連も調べたが特別な相関は見られなかった。多く の課題が残った分析となった。