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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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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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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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Carbon Dots: A Bright Future as Anticounterfeiting Encoding Agents.

Raul Simões1,2,3, Joana Rodrigues3, Victor Neto1,2

  • 1TEMA, Department of Mechanical Engineering, University of Aveiro, Aveiro, 3810-193, Portugal.

Small (Weinheim an Der Bergstrasse, Germany)
|February 24, 2024
PubMed
Summary
This summary is machine-generated.

Luminescent carbon dots (CDs) offer advanced anticounterfeiting solutions by enabling smart encoding. Their tunable luminescence properties enhance product security and support a sustainable circular economy.

Keywords:
anticounterfeitingcarbon dotsinformation encryptionnano composites

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Counterfeit products and data vulnerability pose significant societal challenges.
  • Luminescent tracers, especially carbon dots (CDs), are emerging as effective anticounterfeiting solutions.
  • CDs contribute to product security, environmental sustainability, and the circular economy.

Purpose of the Study:

  • To review the luminescence responsiveness of CDs to stimuli via nanoengineering.
  • To explore tunable luminescence mechanisms and decay times of CDs.
  • To systematically review smart encoding applications of luminescent CDs.

Main Methods:

  • Highlighting luminescence responsiveness of CDs to physical and chemical stimuli.
  • Investigating tunable luminescence mechanisms (up-conversion, delayed fluorescence, etc.).
  • Systematic review of CDs' applications in anticounterfeiting, tracing, and encryption.

Main Results:

  • Nanoengineering enables tunable luminescence and decay times in CDs.
  • Various excitation mechanisms contribute to CD luminescence properties.
  • CDs demonstrate potential in anticounterfeiting, product tracing, and information encryption.

Conclusions:

  • Luminescent CDs are a versatile technology for anticounterfeiting and smart encoding.
  • Further research is needed to address stability and efficacy challenges for practical implementation.
  • CDs offer a pathway towards enhanced product security and data integrity.