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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.5K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.2K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.2K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.3K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.5K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.2K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.9K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.9K

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Updated: Oct 24, 2025

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Core-shellchiralpolymeric-metallic particles obtained in a single step by concurrentlight induced processes.

Nicola Pellizzi1, Alfredo Mazzulla2, Pasquale Pagliusi3

  • 1Physics Department, University of Calabria, Ponte P. Bucci cubo 33B, 87036 Rende (CS), Italy.

Journal of Colloid and Interface Science
|August 13, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed novel chiral microparticles with gold nanoparticle shells. This core-shell architecture enhances light manipulation for advanced microdevices and microlasers.

Keywords:
Chiral materialsCore-shell particlesGold nanoparticlesMicrolasersPhotopolymerizationPhotoreduction

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Core-shell architectures offer tunable properties for microparticles.
  • Chiral materials and metallic nanoparticles are key components in advanced optical devices.

Purpose of the Study:

  • To synthesize microparticles with a chiral dielectric core and a gold nanoparticle shell.
  • To investigate the influence of synthesis parameters on nanoparticle coverage and aggregation.
  • To demonstrate the enhanced optical properties and stability of these microparticles.

Main Methods:

  • UV-induced polymerization of cholesteric reactive mesogens in chloroauric acid solution.
  • In-situ precipitation of gold nanoparticles onto the microparticle surface.
  • Electron microscopy and optical spectroscopy for characterization.

Main Results:

  • Successful synthesis of core-shell microparticles with controlled gold nanoparticle coverage (<100 nm).
  • Gold nanoparticle coverage dependent on chloroauric acid concentration; aggregation influenced by surface morphology.
  • Enhanced stability and performance of dye-doped chiral microparticle microlasers with gold coating.

Conclusions:

  • The core-shell strategy provides control over microparticle properties for light manipulation.
  • This method enables the fabrication of microdevices with tunable intensity, polarization, and generation.
  • The developed microparticles show promise for advanced photonic applications.