角依存原子力顕微鏡 平面面から吸収されたマクロモレクルの単鎖抽出は,吸収-脱吸収移行のシグネチャーを明らかにする
Lucie Grebíková1, Stuart G Whittington2, Julius G Vancso1
1Materials Science and Technology of Polymers, MESA+, Institute of Nanotechnology , University of Twente , P.O. Box 217, 7500 AE Enschede , The Netherlands.
Journal of the American Chemical Society
|May 2, 2018
まとめ
原子力顕微鏡 (AFM) を用いた単一ポリマーチェーン脱吸収の調査は,引く角度が粘着に大きく影響することを明らかにした. 引っ張る角度を小さくすると,表面へのポリマー鎖の粘着性が強化され,重要な吸附-脱吸収の移行が示されます.
科学分野:
- マクロ分子科学
- 表面科学
- ポリマー物理学
背景:
- ポリマー鎖の吸附-脱吸収は,マクロ分子表面科学にとって根本的なものです.
- 原子力顕微鏡 (AFM) の進歩により,脱吸収を研究するための単分子力スペクトロスコーピー (SMFS) が可能になった.
- 単一鎖の振る舞いを理解することは,新しい表面技術を開発するために不可欠です.
研究 の 目的:
- SMFSを使用して平面から単一ポリマー鎖の脱吸収を調査する.
- ポリマー鎖の脱吸収力に対する引く角度の影響を決定する.
- 単一ポリマー鎖の吸附-脱吸収移行ダイナミクスを分析する.
主な方法:
- AFMを使用した単一分子力スペクトロスコーピー (SMFS).
- 水中環境で様々な基板で実施された実験.
- ポリマーが表面誘発型ポリメリゼーションでAFM探査機の先端に共振的に結合する.
主要な成果:
- 吸い込み力は引く角度が減少するにつれて増加し,ポリマー鎖の粘着性が強化されたことを示します.
- 表面の正常値の近くにある脱吸収力の弱角的依存.
- 浅い引く角度で顕著な力の増加が観察され,アドソルプション-デソルプションの移行を意味する.
- 標準化された脱吸収力は,引く角度に関して普遍的な振る舞いを表します.
結論:
- 引く角度は,表面からの単一ポリマーチェーン脱吸収を制御する重要なパラメータです.
- 観測された角的依存は,吸附-脱吸収移行メカニズムについての洞察を提供します.
- 結果は単鎖吸附-脱吸収の理論的予測と一致し,実験的アプローチを検証した.
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