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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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,...
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.0K
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...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Step-Growth Polymerization: Overview01:03

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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...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.3K
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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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
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Visualizing the interfacial-layer-based epitaxial growth process toward organic core-shell architectures.

Ming-Peng Zhuo1,2,3, Xiao Wei2, Yuan-Yuan Li1,3

  • 1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, China.

Nature Communications
|February 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers visualized organic heterostructure (OHT) growth, overcoming challenges in lattice mismatching. This breakthrough enables precise control over core-shell OHTs for advanced nanotechnology applications.

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Area of Science:

  • Nanoscience and nanotechnology
  • Materials science
  • Organic electronics

Background:

  • Organic heterostructures (OHTs) are crucial for micro/nanoscale devices.
  • Epitaxial growth of OHTs with >3% lattice mismatch is challenging.
  • Understanding hierarchical self-assembly is key for OHT design.

Purpose of the Study:

  • To visualize and understand the epitaxial growth process of OHTs.
  • To elucidate the role of a doped interfacial layer in OHT formation.
  • To demonstrate control over OHT morphology and shell structure.

Main Methods:

  • Utilized a doped interfacial layer to facilitate epitaxial growth visualization.
  • Employed barcoded OHTs to illustrate shell growth dynamics.
  • Varied stoichiometric ratio, crystallization time, and temperature to tune OHT properties.

Main Results:

  • Vividly visualized the morphology evolution during OHT epitaxial growth.
  • Demonstrated hierarchical self-assembly of core-shell OHTs with precise spatial configuration.
  • Showcased shell epitaxial growth from tips to center along seeded rods.
  • Successfully modulated OHT diameter, length, and shell number through parameter tuning.

Conclusions:

  • The developed method provides a comprehensive understanding of OHT epitaxial growth.
  • This approach is generalizable to various organic systems with compatible chemistry.
  • Enables the formation of desired OHTs with controlled hierarchical structures.