密度の高い炭素ナノチューブ膜を通過するゲートイオン輸送
Miao Yu1, Hans H Funke, John L Falconer
1Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309-0424, USA.
Journal of the American Chemical Society
|May 28, 2010
まとめ
水嫌ナノ孔を通るイオン拡散は,水の浸透性の変化によってゲートされます. 温度または超音波は,イオンフックスをオン/オフに切り替えて,水処理アプリケーションに影響を与える可能性があります.
科学分野:
- マテリアルサイエンス 材料科学
- ナノテクノロジー ナノテクノロジー
- 物理化学 物理化学
背景:
- ゲートイオン拡散は,様々な外部刺激の影響を受ける生物学的ナノ孔において極めて重要です.
- 水嫌ナノポールの水浸透性は,特に外部の変化下で,イオン拡散に大きな影響を及ぼします.
- 水性ナノチャネルにおけるイオン輸送の理解は,高度な分離技術の開発の鍵です.
研究 の 目的:
- 高度水害性のナノ孔におけるゲーテッドイオン拡散行動を調査する.
- 炭素ナノチューブ膜を通じたイオン輸送に対する水浸透性の変化の影響を調査する.
- 脱塩などの応用のための炭素ナノチューブ膜の潜在能力を実証する.
主な方法:
- 溶剤の蒸発プロセスを用いて,3nmのCNTとインタースティシャル孔を持つ濃厚な炭素ナノチューブ (CNT) 膜の準備.
- 異なった温度と超音波下で,CNT膜を通るイオン拡散の行動を調査する.
- 湿透性の変化を理解するために,CNT膜の水吸収同熱体を分析する.
主要な成果:
- 水性CNT膜を通るイオン拡散は,イオンフルースがオン・オフされ,ゲート付きの行動を示した.
- イオン流は298Kで止まっていたが,20Kの温度上昇や超音波の適用で劇的に増加した.
- 温度に伴い,水の吸収は著しく増加し,毛細血管凝縮と不連続から連続の水相への移行を示した.
結論:
- 温度や超音波によって誘発される,水害性の表面上の水浸透性の変化は,ゲートされたイオン拡散を制御する.
- 炭素ナノチューブ膜は,調節可能なイオン輸送特性を示し,淡水化と水処理の可能性を開拓しています.
- この発見は,イオン輸送を制御するためのナノ孔質材料における水面相互作用の重要性を強調しています.
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Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
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