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関連する概念動画

Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

55.0K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
55.0K
Noble Gases02:54

Noble Gases

22.8K

The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
22.8K
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

39.0K
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
39.0K
Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy03:07

Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy

29.9K
The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
29.9K
Mixtures of Gases: Dalton's Law of Partial Pressures and Mole Fractions03:03

Mixtures of Gases: Dalton's Law of Partial Pressures and Mole Fractions

44.1K
Unless individual gases chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each gas in a mixture exerts the same pressure that it would exert if it were present alone in the container. The pressure exerted by each individual gas in a mixture is called its partial pressure.
44.1K
Mesh Analysis01:20

Mesh Analysis

1.5K
Mesh analysis is a valuable method for simplifying circuit analysis using mesh currents as key circuit variables. Unlike nodal analysis, which focuses on determining unknown voltages, mesh analysis applies Kirchhoff's voltage law (KVL) to find unknown currents within a circuit. This method is particularly convenient in reducing the number of simultaneous equations that need to be solved.
A fundamental concept in mesh analysis is the definition of meshes and mesh currents. A mesh is a closed...
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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor

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メタロフタロシアニンを二金属分子メッシュに溶接し,高感度,低電力化学抵抗性ガス検出

Zheng Meng1, Aylin Aykanat1, Katherine A Mirica1

  • 1Department of Chemistry, Burke Laboratory , Dartmouth College , Hanover , New Hampshire 03755 , United States.

Journal of the American Chemical Society
|January 1, 2019
PubMed
まとめ

この研究は,高感度ガスの検出のための新しい導電性2D金属有機フレームワーク (MOF) を導入します. これらの材料は,湿気条件下でも,アンモニア,硫化水素,酸化窒素の検出に優れた性能を示しています.

科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学センサー

背景:

  • メタル・オーガニック・フレームワーク (MOF) はガスの検出に有望な材料です.
  • 高感度で選択的なガスセンサーの開発は依然として課題です.

研究 の 目的:

  • 化学抵抗性ガス検出のためのイソレチキュラーニッケル・フタロシアニンとニッケル・ナフタロシアニンベースの二金属導電性2DMOFの使用を実証する.
  • 様々なガスの検出におけるこれらのMOFの感度,選択性,および安定性を調査する.

主な方法:

  • ニッケル・フタロシアニンとニッケル・ナフタロシアニンの前体を用いたバイメタリック伝導性2DMOFの製造.
  • 合成されたMOFを使用した化学抵抗性ガスセンサーの製造.
  • アンモニア (NH3),硫化水素 (H2S),窒素酸化物 (NO) に対するセンサーの性能を,異なる濃度および湿度で試験する.
  • 電子パラマグネティック共振スペクトロスコーピーとX線光電子スペクトロスコーピーを用いて検出メカニズムを解明する.

主要な成果:

  • NH3 (0.31-0.33ppm),H2S (19-32ppb) とNO (1.0-1.1ppb) の例外的な感度は,低駆動電圧 (0.01-1.0V) で1.5分以内に達成された.
  • 5000ppmの水蒸気 (H2O) の存在でもセンサーの性能が一貫している.

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  • アイソレティキュラー類は,異なるリンク器と金属ノードの組み合わせによって,選択性と感受性に対するモジュール制御を示した.
  • 主要な検出メカニズムとして,吸収された分析物とMOFの間の電荷移転相互作用の証拠.

    • 結論:

    • 開発されたバイメタリック伝導性2DMOFは,化学抵抗性ガス検出技術の重要な進歩を表しています.
    • アイソレティキュラーアナログのモジュール性は,特定のガス分析剤に合わせたセンサー設計を可能にします.
    • MOFベースのセンサーは,高い感度,迅速な応答,および湿気条件下での安定性を示すため,実用的なアプリケーションに適しています.