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関連する概念動画

Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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関連する実験動画

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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ピレネ基の光三次元共性有機枠組

Guiqing Lin1, Huimin Ding1, Daqiang Yuan2

  • 1Key Laboratory of Biomedical Polymers (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University , Wuhan 430072, China.

Journal of the American Chemical Society
|March 2, 2016
PubMed
まとめ
この要約は機械生成です。

研究者は,ユニークなptsトポロジーを持つ新しい3D共性有機フレームワーク (3D COF) を合成した. この光3DCOFは,選択的なCO2吸収と爆発物の検出の可能性を示しています.

さらに関連する動画

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科学分野:

  • 材料科学
  • 化学について
  • ナノテクノロジー

背景:

  • 新しいトポロジーと機能的なユニットで3D共性有機フレームワーク (COF) を合成することは困難です.
  • 既存の方法はしばしばフレームワークのアーキテクチャとプロパティの正確な制御に苦労します.

研究 の 目的:

  • 新しい3DピレンベースのCOF (3D-Py-COF) の最初の合成と特徴を報告する.
  • 新しい3D COF トポロジーを探索し,高度なアプリケーションのために光電特性を取り入れる.

主な方法:

  • 選択的な前駆体設計と制御された接続パターン
  • 構造分析のためのX線微分法 (XRD).
  • トポロジーと特性を決定する計算シミュレーション.

主要な成果:

  • 新しい3D-Py-COFの合成に成功しました 独特の2重の相互浸透したptsトポロジーです
  • 3D-Py-COFは,狭い孔のサイズ分布,高い表面積,およびN2に対する選択的なCO2吸収を示しています.
  • この材料は,分離されたピレン単位により,最初の光3DCOFであり,爆発物の検出に希望を示しています.

結論:

  • 新しいトポロジーで3D COFを合理的に設計する可能性を証明する.
  • 3D COFに光電ユニットを組み込むことは,ユニークで価値のある性質を持つ材料を生成します.
  • 開発された3D-Py-COFは,ガス分離とセンシングのアプリケーションに潜在的な可能性を秘めています.