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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Atomic Mass01:52

Atomic Mass

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Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Molecules and Compounds02:38

Molecules and Compounds

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Atoms and Molecules
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相关实验视频

Updated: Jan 31, 2026

Bacterial Immobilization for Imaging by Atomic Force Microscopy
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通过先进显微镜的限制方法进行原子单分子成像.

Jiale Feng1,2, Mengmeng Ma1,2, Bin Song1,2

  • 1Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China.

Fundamental research
|January 30, 2026
PubMed
概括

原子单分子成像技术可视化小分子. 使用微孔材料的空间限制,如热质石,可以在室温下对分子结构和行为进行成像.

关键词:
原子核问题解决方案封闭方法的封闭方法.显微镜的使用方法分子结构的分子配置.单个分子成像成像技术

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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy
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相关实验视频

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科学领域:

  • 物理化学 物理化学
  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术

背景情况:

  • 原子单分子成像对于理解小分子特性至关重要.
  • 目前的方法面临着诸如热活性和光束灵敏度等挑战.
  • 使用扫描道显微镜和电子显微镜等技术,已经实现了安格斯特罗姆级别的分辨率.

研究的目的:

  • 审查单分子成像中的限制策略.
  • 要总结最近关于单分子结构和行为的研究.
  • 为了突出新的封闭方法.

主要方法:

  • 专注于各种成像技术中的空间限制策略.
  • 讨论如何使用微孔材料 (例如,地质石) 进行分子封闭.
  • 分析最近使用这些封闭方法的研究.

主要成果:

  • 在室温下空间封闭是可以使用微孔材料实现的.
  • 热质石使单个分子在其道内固定和可视化.
  • 这种方法克服了热活性和光束灵敏度的局限性.

结论:

  • 限制策略显著提升了单分子成像能力.
  • 微孔材料为室温分子可视化提供了一个有前途的途径.
  • 未来的研究方向包括探索新的限制应用和潜在的发现.