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Related Concept Videos

Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Physical Properties of Alcohols and Phenols02:32

Physical Properties of Alcohols and Phenols

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Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
Alcohols possess a higher boiling point than aliphatic hydrocarbons of...
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Hydrogen Bonds01:04

Hydrogen Bonds

11.9K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Surface Active Agents01:27

Surface Active Agents

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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Compact Quantum Dots for Single-molecule Imaging
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Versatile, Aqueous Soluble C2N Quantum Dots with Enriched Active Edges and Oxygenated Groups.

Xuanhe Hu1, Linfeng Zhong1, Chenhao Shu1

  • 1Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High Performance Polymer-based Composites of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.

Journal of the American Chemical Society
|February 21, 2020
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Summary

Researchers synthesized water-soluble carbon nitride quantum dots (C2NQDs) for the first time. These C2NQDs exhibit unique optical properties and act as efficient metal-free catalysts for lithium-sulfur batteries.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Two-dimensional (2D) layered frameworks like C2N show promise for fundamental studies and applications.
  • Transforming bulk C2N into zero-dimensional quantum dots (QDs) can enhance properties via quantum confinement and edge effects.
  • C2N quantum dots (C2NQDs) remain largely unexplored, with limited understanding of their properties and edge effects.

Purpose of the Study:

  • To report the first synthesis of water-soluble C2NQDs.
  • To investigate the linear/nonlinear optical properties of C2NQDs.
  • To explore their edge-preferential electrocatalytic activity for polysulfides in lithium-sulfur batteries.

Main Methods:

  • A top-down synthesis approach was employed to create dispersant-free C2NQDs.
  • Characterization included analysis of size, optical properties (one-photon and two-photon luminescence), and surface chemistry.
  • Electrocatalytic activity was tested by modifying commercial separators for Li-S batteries.

Main Results:

  • Water-soluble C2NQDs (<5 nm) with oxygen-carrying groups and active edges were successfully synthesized.
  • C2NQDs demonstrated blue one-photon luminescence (UV excitation) and green two-photon luminescence (750-900 nm NIR excitation).
  • Modified separators with C2NQDs boosted polysulfide redox kinetics, enabling high performance in Li-S batteries (7.0 mA h cm⁻² at 8.0 mg cm⁻² sulfur loading).

Conclusions:

  • The first synthesis of water-soluble C2NQDs was achieved without foreign stabilizers.
  • C2NQDs possess unique optical properties suitable for applications like fluorescent inks.
  • The active edges of C2NQDs are crucial for efficient polysulfide catalysis, significantly enhancing Li-S battery performance.