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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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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Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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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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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Introduction to aggregation induced emission (AIE) materials.

Sujoy Bandyopadhyay1, Suresh K Kalangi2, Vijai Singh3

  • 1Department of Chemistry, School of Science, Indrashil University, Mehsana, India.

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Aggregation-induced emission (AIE) luminogens offer bright, stable imaging for biological processes. These molecules are non-emissive alone but become highly luminous when aggregated, revolutionizing biomedical applications.

Keywords:
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Area of Science:

  • Photophysical processes
  • Biomedical imaging
  • Molecular probes

Background:

  • Classical photophysical studies were challenged by the emergence of aggregation-induced emission (AIE).
  • AIE luminogens (AIEgens) are non-emissive in solution but become highly emissive upon aggregation.
  • AIE offers new possibilities for rapid detection and analysis of bioactive substances and biological processes.

Purpose of the Study:

  • To provide a foundational understanding of AIE.
  • To explore the transformation of aggregation-caused quenching (ACQ) to AIE.
  • To review AIE molecules and their biomedical applications.

Main Methods:

  • Overview of the phenomenon of aggregation-caused quenching (ACQ).
  • Discussion of strategies for converting ACQ to AIE.
  • Exploration of the photophysics underlying AIE.

Main Results:

  • AIEgens exhibit unique properties like high brightness, photostability, and biocompatibility.
  • AIE has enabled advancements in rapid detection and monitoring of biological processes.
  • Novel AIE molecules have been identified for diverse biomedical applications.

Conclusions:

  • AIE represents a significant advancement over traditional photophysical processes.
  • AIEgens are versatile tools for biomedical research and diagnostics.
  • The unique properties of AIEgens make them ideal for bio-inspired probes.