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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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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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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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: Interference01:30

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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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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Time-Encoded Information Encryption with pH Clock Guided Broad-Spectrum Emission by Dynamic Assemblies.

Priyam Das1, Tanushree Das1, Suprotim Koley2

  • 1Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.

Angewandte Chemie (International Ed. in English)
|August 22, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel pH-switchable fluorescent material for advanced anti-counterfeiting. This aggregation-induced emission (AIE) system creates dynamic, multi-level security patterns with temporal encryption, enhancing data protection against sophisticated threats.

Keywords:
Anti-counterfeitingCyanostilbenesEncryptionpH clock

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Area of Science:

  • Materials Science
  • Chemistry
  • Security Technology

Background:

  • Counterfeiting poses significant security risks, driving demand for advanced anti-counterfeiting technologies.
  • Aggregation-induced emission (AIE) materials offer promising fluorescence-based encryption solutions.
  • Developing dynamic, multi-level security patterns remains a challenge.

Purpose of the Study:

  • To create a pH-switchable fluorescent assembly for dynamic anti-counterfeiting applications.
  • To develop a temporal encryption strategy using a chemical trigger-regulated pH clock.
  • To design multi-input fluorescent chemical logic gates for enhanced security.

Main Methods:

  • Synthesized a pH-switchable fluorescent assembly using an AIEgen and an aliphatic acid.
  • Utilized a chemical trigger-regulated pH clock to control temporal molecular assembly and emission.
  • Integrated time-gated emissive properties for multi-dimensional data encryption.

Main Results:

  • Achieved pH-dependent multicolor and transient white light emission.
  • Successfully constructed smart multi-input fluorescent chemical AND gates.
  • Demonstrated an advanced multi-dimensionally secure data encryption strategy based on temporal characteristics.

Conclusions:

  • The developed AIE-based system offers a novel approach to dynamic, hierarchical anti-counterfeiting.
  • Temporal control of fluorescence provides an additional security layer for data encryption.
  • This strategy enhances security against counterfeiting by incorporating time-dependent features.