関連する実験動画
Updated: Jul 26, 2026
11:59
In Situ Characterization of Boehmite Particles in Water Using Liquid SEM
Published on: September 27, 2017
水嫌性シリカナノチューブの毛細血管を観察する
Karthik Jayaraman1, Kenji Okamoto, Sang Jun Son
1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
Journal of the American Chemical Society
|December 8, 2005
まとめ
溶媒は,水嫌性シリカナノチューブに独特の濡れる行動を示し,マクロスコープの予測とは異なる. この研究は,水分化の急激で可逆的な移行を明らかにし,ナノスケールでの従来の毛細血管理論に挑戦しています.
科学分野:
- ナノテクノロジー ナノテクノロジー
- 物理化学 物理化学
- マテリアルサイエンス 材料科学
背景:
- テンプレートで合成されたシリカナノチューブは,閉じ込められた液体を研究するための調整可能なナノコンテナを提供します.
- ナノスケールの毛穴における溶媒の振る舞いを理解することは,様々な用途において極めて重要です.
研究 の 目的:
- 水性シリカナノチューブの内部の濡れやすさを調査するために.
- ナノスケールの湿り現象を,マクロスケールの毛細血管性理論,特にヤング=ラプラスの方程式と比較する.
主な方法:
- 内径30 nmと170 nmの個々のシリカナノチューブに関する実験研究.
- 水/メタノール混合物を使って様々な条件で湿潤を調査する.
- 補完的なアンサンブル実験が行われました.
主要な成果:
- メタノールを加えると,濡れる状態と濡れない状態の間の急激な移行が観察されました.
- この移行は,30nmと170nmのナノチューブの両方で一貫していました.
- ヤング=ラプラスの方程式は,湿潤移行時のメタノール濃度を正確に予測できませんでした.
- 観察された濡れる行動は,逆転可能であった.
結論:
- いくつかの側面は従来の毛細血管と一致していますが,水害性ナノチューブのナノスケール湿化はヤング・ラプラスの予測から逸脱しています.
- 不一致は,マクロスコープの接触角度値を使用することや,毛穴内の液相不安定から生じる可能性があります.
関連する概念動画
02:57Surface Tension, Capillary Action, and Viscosity
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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01:19Capillarity in Fluid
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