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Related Concept Videos

Atomic Emission Spectroscopy: Lab01:29

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Area of Science:

  • Materials Science
  • Biophysics
  • Electron Microscopy

Background:

  • Cryogenic transmission electron microscopy (cryo-TEM) visualizes liquid-phase materials and biomaterials under cryogenic conditions.
  • Conventional cryo-TEM provides structural data (size, shape, dispersion) but lacks elemental composition information.
  • Elemental analysis is crucial for detailed material evaluation.

Purpose of the Study:

  • To develop and validate a method for elemental mapping of nanoparticles and soft/biomaterials in frozen solvents using cryo-TEM.
  • To integrate electron energy loss spectroscopy (EELS) with energy-filtered (EF) cryo-EM for elemental analysis.
  • To achieve accurate and reliable signal extraction while minimizing electron dose.

Main Methods:

  • Developed a cryo-EELS method integrated with EF-cryo-EM for elemental mapping.
  • Employed the three-window method for cryo-EELS analysis.
  • Implemented stage drift alignment and interexposure drift correction during image acquisition.
  • Optimized electron dose for accurate signal extraction.

Main Results:

  • Successfully generated elemental maps for nanoparticles as small as 10 nm in frozen solvent.
  • Extended the technique to analyze protein-coated silica nanoparticles and hydroxyapatite (HAp) nanoparticles in vitrified solvent.
  • Mapped silica (cores), carbon (protein shells), and phosphorus/calcium (HAp) within the same imaging area.

Conclusions:

  • The developed cryo-EELS method enables high-resolution elemental mapping of nanomaterials in frozen solvents.
  • This technique provides detailed compositional insights into complex biological and synthetic nanoparticles.
  • The method is valuable for analyzing light elements in biological systems and nanomaterials.