Departmental Bulletin Paper 酸化亜鉛ナノ粒子の凝集・分散現象におよぼす表面修飾分子の影響
サンカ アエン ナノ リュウシ ノ ギョウシュウ・ブンサン ゲンショウ ニ オヨボス ヒョウメン シュウショク ブンシ ノ エイキョウ
Effect of surface modified molecules on aggregation and dispersion phenomena of zinc oxide nanoparticles

森, 康維  ,  柚木, 瑠美子  ,  土屋, 活美  ,  モリ, ヤスシゲ  ,  ユノキ, ルミコ  ,  ツチヤ, カツミ  ,  Mori, Yasushige  ,  Yunoki, Rumiko  ,  Tsuchiya, Katsumi

58 ( 1 )  , pp.19 - 24 , 2017-04-30 , 同志社大学ハリス理化学研究所 , Transcription:ドウシシャ ダイガク ハリス リカガク ケンキュウジョ , Alternative:Harris Science Research Institute of Doshisha University
半導体である酸化亜鉛ナノ粒子の光学特性はその粒子径に強く影響を受けるので,単分散のナノ粒子を得ることが重要となる。反応場を制御した湿式プロセスでは比較的単分散のナノ粒子を合成できるが,一般には粒子径分布を持つことが多い。このため,分級は多分散のナノ粒子から単分散のナノ粒子を得る有用な操作方法の一つといえる。分級技術である貧溶媒添加法は,ナノ粒子の安定性は粒子径に依存するという現象を利用している。この分級技術を酸化亜鉛ナノ粒子に適用するには,粒子が安定に分散している必要があるが,その分散安定性は余り報告されていない。本研究では,酢酸,Ethyl 3, 4-dihydroxybenzoate (CAT),ドデシルアミンの3種類を表面修飾分子として,酸化亜鉛ナノ粒子を合成し,粒子の分散性を検討した。酸化亜鉛ナノ粒子の特性をX線回折散乱法と紫外可視分光法で調べた。酢酸あるいはCATを表面修飾分子とすると,エタノールに分散した粒子を作製できた。ヘプタンを貧溶媒として貧溶媒添加法を適用し,粒子の分級に成功した。
The optical properties of ZnO-based semiconductive nanomaterials are strongly influenced by particle size. Therefore, it is important to have monodispersed nanoparticles (NPs). Relatively high monodispersed NPs can be synthesized in wet chemical system when the reaction field is controlled. Even using such synthetic-controlled techniques, however, synthesized NPs often have a size distribution. Hence, the classification is one of useful operations to get monodispersed NPs from polydispersed NPs. Size-selective precipitation is an attractive classification technique and can be operated as the idea that the stability of NPs depend on the particle size. When this technique is applied to ZnO NPs, the dispersibility of ZnO NPs should be stable. However, the stable systems of ZnO NPs dispersion have not been much reported. In this work ZnO NPs with three types of surface modified molecules (acetic acid, Ethyl 3, 4-dihydroxybenzoate (CAT), and dodecylamine) were synthesized. The characterization of as-prepared ZnO NPs was performed by X-ray diffraction (XRD) and UV-Vis absorption. Only ZnO NPs capped by acetic acid and CAT could disperse in ethanol. These were able to maintain the stabilization against agglomeration of the ZnO NPs. Therefore, we applied ZnO NPs capped by acetic acid and CAT to the size-selective precipitation. The size-selective precipitation method was performed by gradual addition of heptane (poor solvent) to well-dispersed colloid in ethanol (good solvent). This method was succeeded and those samples could be recovered in order of their size.

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