ディブロックコポリマーナノ粒子-結晶相互作用の機械的洞察 局所原子力顕微鏡で明らかになった
Coit T Hendley1, Lee A Fielding2, Elizabeth R Jones3
1Department of Materials Science and Engineering , Cornell University , Ithaca , New York 14853 , United States.
Journal of the American Chemical Society
|June 20, 2018
まとめ
成長するカルシット結晶とのナノ粒子相互作用が視覚化されました. アニオンポリマーナノ粒子は,より高い組み込み率を示し,ナノ複合物の形成を改善するための設計原理を示唆した.
科学分野:
- 材料科学
- ナノテクノロジー
- クリスタルグラフィー
背景:
- ナノ粒子は単一結晶に組み合わされ,ナノ複合材料を形成します.
- ナノスケールの相互作用を理解することは 閉塞を制御するために不可欠です
- カルシートはこれらの相互作用を研究するためのモデルシステムとして機能します.
研究 の 目的:
- 二重ブロックコポリマーナノ粒子と成長するカルシット表面の間のナノスケール相互作用を視覚化して理解する.
- ナノ粒子の表面化学が相互作用モードと遮断効率にどのように影響するか調査する.
- ナノ粒子の組み込みにおける観察された差異を説明するメカニズムを提案する.
主な方法:
- 現場原子力顕微鏡 (AFM) を使用して,ナノ粒子とカルシートの相互作用をリアルタイムで観察した.
- 様々な安定剤ブロック (非離子Ph-PGMA,炭酸尖端HOOC-PGMA,および離子PMAA) を含むディブロックコポリマーナノ粒子を合成した.
- 相互作用モード (結合/分離,浮遊,結合) は,ナノ粒子表面化学に基づいて定量化されました.
主要な成果:
- 3つの異なる相互作用モードが特定されました. 固定/分離,ホーバー,および組み込み.
- アニオン型ポリメタクリル酸 (PMAA) 安定化ナノ粒子は,カーボキシル酸型ポリメタクリル酸 (HOOC-PGMA) ナノ粒子 (~50%) に比べて,著しく高い"浮遊"または組み込み率 (~85%) を示した.
- アニオンナノ粒子の2つの状態の結合メカニズムが提案され",浮遊"に拡張された安定剤鎖と組み込みに崩壊した鎖が含まれる.
結論:
- ナノ粒子の表面化学,特にアニオン安定剤ブロックの存在は,成長するカルシット結晶との相互作用に強く影響します.
- 提案されている2つの状態の結合メカニズムは,ナノ粒子の遮断を理解し予測するための枠組みを提供します.
- この研究は,高度なナノ複合材料の製造のための結晶の成長におけるナノ粒子の組み込み効率の向上のための設計原理を提供します.
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