ディブロックコポリマーにおけるイオンの拡散における溶解の役割:モデル化による分子重量効果の理解
Youngmi Seo1, Kuan-Hsuan Shen1, Jonathan R Brown1
1William G. Lowrie Department of Chemical and Biomolecular Engineering , The Ohio State University , 151 West Woodruff Avenue , Columbus , Ohio 43210 , United States.
Journal of the American Chemical Society
|November 2, 2019
まとめ
分子ダイナミクスのシミュレーションでは,塩を添加したディブロックコポリマーにおけるイオン拡散は,イオン溶解強度と濃度に依存していることが明らかになった. 局所的なイオン集積は,インターフェイスの幅ではなく,イオンの拡散と拡散を鋭くすることで,拡散の減少を説明します.
科学分野:
- 材料科学
- ポリマー化学
- コンピュータ化学
背景:
- 塩でドーピングされた二重ブロック共ポリマーは,イオン伝導性および機械的に強い領域のため,輸送用途に有望である.
- 実験的研究では 電子伝導が分子量で増加するなど 直感に反する輸送傾向が示されています
- 伝導相における強いイオン溶解は重要な特徴である.
研究 の 目的:
- 塩を添加した二重ブロック共ポリマーにおけるイオン輸送の分子基盤を調査する.
- 分子力学シミュレーションを用いて実験的に観測された傾向を再現する.
- イオン溶解,濃度,およびポリマー構造がイオン拡散に及ぼす影響を調査する.
主な方法:
- 粗い粒子の分子動力学シミュレーション
- イオン溶解効果をモデル化するための1 / r ^ 4の潜在的な含有.
- イオン濃度,溶解強度,およびポリマーの分子量の体系的な変化.
主要な成果:
- イオン拡散は,溶解強度に応じて,イオン濃度によって増加または減少することができます.
- 分子重量の増加は,特に強い溶解またはイオン対イオン相互作用でイオン拡散を高める.
- インターフェイスの幅ではなく,局所的なイオン集積が,拡散の減少の主な原因です.
- フロリー・キパラメータと分子量によって影響されるインターフェイスのシャープニングは,均一なイオン分布と増加した拡散を促進します.
結論:
- 分子ダイナミクスシミュレーションは,二重ブロックコポリマーで観察されたイオン輸送の傾向を成功裏に複製します.
- イオン溶解と局所的なイオン集積は,イオン拡散を制御する重要な要因である.
- ポリマー設計を通じてインターフェイス特性を制御することで,技術的なアプリケーションのためのイオン輸送を最適化できます.
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