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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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電子顕微鏡は,金属・有機枠組におけるヨウ素の不均一な吸収と同時欠陥形成を明らかにする.

Ying Liu1, Dong Liu1, Zhaohui Liu1

  • 1Multi-scale Porous Materials Center, Institute of Advanced Interdisciplinary Studies & School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P. R. China.

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まとめ

MFM-300の分子ヨウ素 (I2) の吸収は,飽和状態でも不均一である. STEM画像は 空のチャネルと 埋められたチャネル,三重ヘリックス構造と 持続的なフレームワークの欠陥を明らかにしました

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学について

背景:

  • アドソープションイソテルムは,ガス吸収を研究するための標準ですが,空間的変化を明らかにすることはできません.
  • 強いアドソルベートとアドソルベントの相互作用によって,アドソルベントの不均一性が生じることがあります.
  • メタル・オーガニック・フレームワーク (MOF) は,吸収研究のために調節可能な多孔構造を提供します.

研究 の 目的:

  • MFM-300 (Sc) MOF内の分子ヨウ素 (I2) 吸収の空間的分布を視覚化して理解する.
  • MOFにおけるI2吸収の構造的影響を調査する.
  • MOFからの放出を制御するための戦略を開発する.

主な方法:

  • 高解像度スキャニング伝送電子顕微鏡 (STEM) で,MFM-300 (Sc) 内のI2を直接可視化する.
  • 観測されたI2パッキング構造を解釈するための画像シミュレーション.
  • I2の放出を最小限に抑えるためのサーファクタント・キャピング戦略の開発.

主要な成果:

  • MFM-300 (Sc) の吸収は本質的に不均一であり,すべての吸収レベルで異なるチャネル埋着が観察される.
  • 飽和状態でも (23I原子/ユニットセル) MOFチャネルはほぼ空から密度が高いまで変化した.
  • 画像シミュレーションでは,トリプルヘリックスI2構造の局所的形成が示唆されている (最大142I原子/ユニット細胞).
  • I2吸収は,MOFのフレームワークで持続的な構造的欠陥 (エッジの変位,スタッキングの欠陥) を引き起こしました.
  • STEMによって確認された,表面活性物質のキャピング戦略は,I2の放出を効果的に最小限に抑えました.

結論:

  • STEMによる直接ビジュアライゼーションは,異質なアドソープションシステムのアドソープション同温度の制限を克服します.
  • MFM-300 ((Sc) は複雑で不均質なI2吸収行動を示し,潜在的に新しい構造を形成する.
  • I2吸収は,MOFを構造的に修正し,脱吸収後に持続する欠陥を生成します.
  • 表面活性物質のキャピングは,MOF内の吸収された種を安定させるための有効な方法を提供します.