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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Surface Active Agents01:27

Surface Active Agents

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...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

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Related Experiment Video

Updated: Jul 17, 2026

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

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Self-assembly study of polydisperse ethylene oxide-based nonionic surfactants.

Miklós Nagy1, Laszló Szöllösi, Sandor Kéki

  • 1Department of Applied Chemistry, University of Debrecen, H-4010 Debrecen, Hungary.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 24, 2007
PubMed
Summary

Researchers studied polyethoxylate-based nonionic surfactants

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Published on: January 25, 2018

Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry

Background:

  • Nonionic surfactants are crucial in various applications.
  • Understanding their self-assembly is key to optimizing performance.

Purpose of the Study:

  • To investigate the self-assembly behavior of polyethoxylate-based multicomponent nonionic surfactants.
  • To determine key thermodynamic parameters and structural characteristics of surfactant micelles.

Main Methods:

  • Dynamic Light Scattering (DLS) for micelle size and distribution.
  • MALDI-TOF-MS and 1H NMR for molecular weight and HLB determination.
  • Thermodynamic analysis of critical micelle concentration (cmc) and hydrophile-lipophile balance (HLB).

Main Results:

  • Established a correlation between HLB and ln(cmc) values, described by a simple equation.
  • Quantified micelle size, size distribution, and thermodynamic parameters.
  • Calculated the contribution of ethylene oxide units to Gibbs free energy of micellization.

Conclusions:

  • The study provides a quantitative relationship for predicting surfactant behavior.
  • The findings aid in the rational design of nonionic surfactants for specific applications.
  • A single ethylene oxide unit's contribution to micellization energy was elucidated.