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関連する概念動画

Area of a Surface of Revolution01:29

Area of a Surface of Revolution

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Surfaces of revolution are formed when a two-dimensional curve is rotated around an axis, producing a three-dimensional shape. This concept is used in engineering tasks like determining the surface area of a rocket nozzle, where precise calculations are critical for applying uniform heat-resistant coatings. When a curve is revolved about the x-axis, it sweeps out a continuous surface whose area must be calculated accurately to estimate material requirements.Approximating with Conical BandsTo...
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Surface Tension and Surface Energy01:16

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Surface Tension, Capillary Action, and Viscosity02:57

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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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Wood Surfacing01:14

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Wood surfacing is a critical finishing process designed to smoothen the wood surface, enhance its dimensional accuracy, and make handling safer. This process compensates for potential shrinkage during the seasoning phase by marginally increasing the wood dimensions before surfacing. It also helps correct some distortions that may occur as the wood dries.
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Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
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For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic...
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Updated: Jan 31, 2026

Cell Surface Receptor Identification Using Genome-Scale CRISPR/Cas9 Genetic Screens
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表面自由エネルギーと表面構成の相関関係

M K Chaudhury, G M Whitesides

    Science (New York, N.Y.)
    |March 6, 1992
    PubMed
    まとめ
    この要約は機械生成です。

    この研究では,ポリジメチルシロキサン (PDMS) の自己組み立てモノレイヤー (SAM) の接触角度を使用して,表面自由エネルギー測定を検証しています. これらの発見は,低エネルギー固体表面に対する接触角度方法の信頼性を確認しています.

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    科学分野:

    • マテリアルサイエンス 材料科学
    • 表面化学について
    • ポリマーサイエンスの科学

    背景:

    • 自己組み立てモノレイヤ (SAM) は,表面の性質を変更するために決定的に重要です.
    • ポリジメチルシルオキサン (PDMS) は,様々な用途で広く使用される弾性体です.
    • 表面自由エネルギー (gamma_sv) の正確な測定は,表面相互作用を理解するために不可欠です.

    研究 の 目的:

    • 化学的に改変されたPDMS表面の表面の自由エネルギーを調査する.
    • 表面の自由エネルギーと表面の組成の間の相関を確立するために.
    • 低エネルギー固体の表面自由エネルギーを推定するために接触角度測定の使用を実験的に検証する.

    主な方法:

    • PDMS基板にアルキルシロキサンのSAMを製造する.
    • 半球レンズを使用して,制御された負荷下で表面変形の測定.
    • 測定された変形からの表面自由エネルギー (gamma_sv) の推定.
    • コンタクトアングルの測定と結果の比較.

    主要な成果:

    • SAMで修正されたPDMS表面の表面自由エネルギーがうまく推定されました.
    • 測定された表面自由エネルギーは,SAMの表面化学組成と強い相関関係を示した.
    • 推定された表面自由エネルギーは,接触角度測定から得られた値とよく一致していました.

    結論:

    • この研究は,低エネルギー固体の表面自由エネルギーを決定するための接触角度測定の有効性を支持する直接的な実験的証拠を提供します.
    • PDMS上のSAMは,表面相互作用の研究のための信頼性の高いモデルシステムとして機能します.
    • この研究は,表面の特徴化における接触角ゴニオメトリーの有用性を強化しています.