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Related Concept Videos

2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...

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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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New core-shell hyperbranched chitosan-based nanoparticles as optical sensor for ammonia detection.

Ibrahim M El-Sherbiny1, Amr Hefnawy1, Ehab Salih1

  • 1Center for Materials Science, Zewail City of Science and Technology, 6th October City, 12588 Giza, Egypt.

International Journal of Biological Macromolecules
|February 7, 2016
PubMed
Summary

New amino-terminated hyperbranched chitosan nanoparticles were synthesized and used to create silver nanoparticles. These novel nanoparticles show promise as optical sensors for detecting ammonia concentration in solutions.

Keywords:
ChitosanHyperbranchedNanoparticleSensorSilver

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomaterials

Background:

  • Chitosan nanoparticles are versatile biomaterials with potential applications in sensing.
  • Developing efficient synthesis methods for functionalized nanoparticles is crucial for advanced applications.
  • Core-shell nanostructures offer unique properties for targeted material development.

Purpose of the Study:

  • To prepare novel amino-terminated hyperbranched chitosan nanoparticles (HBCs-NH2) NPs.
  • To utilize HBCs-NH2 NPs as a platform for the controlled synthesis of silver nanoparticles (AgNPs).
  • To evaluate the potential of the synthesized HBCs-NH2 NPs-AgNPs as an optical sensor for ammonia detection.

Main Methods:

  • Synthesis and characterization of HBCs-NH2 NPs using ninhydrin assay, FTIR, TGA, and FESEM.
  • Facile synthesis of AgNPs on the HBCs-NH2 NPs platform.
  • Characterization of AgNPs formation using FTIR, UV-vis spectrometry, X-ray diffraction, SEM, and HRTEM.
  • Assessment of ammonia sensing capabilities based on Surface Plasmon Resonance (SPR) changes.

Main Results:

  • Successful preparation and characterization of core-shell amino-terminated hyperbranched chitosan nanoparticles.
  • Controlled synthesis of AgNPs on the surface of HBCs-NH2 NPs, confirmed by various spectroscopic and microscopic techniques.
  • Observation of color change (colorless to yellow) and SPR peak at 400 nm upon AgNPs formation.
  • HRTEM analysis revealed uniform spherical HBCs-NH2 NPs (400 nm) with surface-deposited AgNPs (20-50 nm).

Conclusions:

  • The study successfully developed a novel core-shell nanostructure comprising amino-terminated hyperbranched chitosan nanoparticles decorated with silver nanoparticles.
  • The synthesized HBCs-NH2 NPs-AgNPs exhibit significant potential as an effective optical sensor for quantifying ammonia concentration in solutions.
  • The colorimetric and SPR-based detection mechanism offers a promising avenue for developing sensitive and selective ammonia sensors.