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Related Concept Videos

Redox Reactions01:24

Redox Reactions

56.5K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

1.2K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Introduction to Electrophilic Addition Reactions of Alkenes02:24

Introduction to Electrophilic Addition Reactions of Alkenes

8.4K
The double bond in a simple, unconjugated alkene is a region of high electron density that can act as a weak base or a nucleophile. The filled π orbital (HOMO) of the double bond can interact with the empty LUMO of an electrophile. A bonding interaction occurs when the electrophile attacks between the two carbons; the electrophile then accepts a pair of electrons from the π bond and undergoes addition across the double bond, yielding a single product.
Addition and elimination...
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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.9K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Updated: Sep 21, 2025

Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device
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Redox-Driven Spontaneous Double Emulsion.

Ruiting Li1, Zhen Wang1, Xinglei Tao1

  • 1Department of Chemistry, Renmin University of China, Beijing 100872, China.

ACS Macro Letters
|June 1, 2022
PubMed
Summary
This summary is machine-generated.

A novel redox-driven method enables spontaneous formation of stable water-in-oil-in-water (W/O/W) double emulsions by using an oxidation reaction to create osmotic pressure, overcoming limitations of traditional salt-based approaches.

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Area of Science:

  • Colloid and Surface Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Spontaneous emulsification offers advantages for creating stable double emulsions.
  • Traditional methods for W/O/W double emulsions are limited by the poor solubility of osmotic agents in organic oils.
  • Developing new spontaneous emulsification techniques is crucial for advancing emulsion technology.

Purpose of the Study:

  • To develop and investigate a novel redox-driven spontaneous emulsification method for W/O/W double emulsions.
  • To overcome the limitations of conventional osmotic pressure modifiers in organic phases.
  • To enhance the stability and preparation efficiency of double emulsions.

Main Methods:

  • Implementation of an oxidation reaction within the oil phase to generate osmotic pressure via cation radicals and iodide counterions.
  • Utilization of amphiphilic polymer chains as stabilizers for the oil-water (W/O) interfaces.
  • Application of various characterization techniques to analyze the reaction mechanism and emulsion formation.

Main Results:

  • Successful development of a redox-driven spontaneous emulsification process for W/O/W double emulsions.
  • Demonstration that the oxidation reaction effectively generates the necessary osmotic pressure in the oil phase.
  • Confirmation of amphiphilic polymers' role in stabilizing the internal W/O interfaces.
  • Elucidation of the underlying mechanisms of both the redox reaction and spontaneous emulsification.

Conclusions:

  • The redox-driven method provides a viable alternative to salt-based approaches for spontaneous W/O/W double emulsion preparation.
  • This technique enhances emulsion stability and simplifies the preparation process.
  • The findings open new avenues for designing advanced functional emulsions.