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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

165
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...
165
Ionic Association01:28

Ionic Association

220
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Ion Exchange01:17

Ion Exchange

1.6K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Solubility03:00

Solubility

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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,...
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Intermolecular Forces03:13

Intermolecular Forces

63.1K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

1.8K
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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Related Experiment Video

Updated: May 6, 2026

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

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Universal binding behavior for ionic alkyl surfactants with oppositely charged polyelectrolytes.

Dongcui Li1, Norman J Wagner

  • 1Center for Neutron Science, Center for Molecular and Engineering Thermodynamics, Department of Chemical & Biomolecular Engineering, University of Delaware , Newark, Delaware 19716, United States.

Journal of the American Chemical Society
|October 29, 2013
PubMed
Summary

Researchers developed a new method to predict how strongly surfactants bind to polyelectrolytes. This finding aids in designing better formulations for consumer products and medicines by understanding binding strength based on chemical properties.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Oppositely charged polyelectrolyte-surfactant mixtures are vital in biology and consumer products.
  • Formulating these mixtures is difficult due to complex association mechanisms.

Purpose of the Study:

  • To develop a predictive model for surfactant-polyelectrolyte binding strength.
  • To establish a quantitative relationship for rational formulation design.

Main Methods:

  • Compilation and analysis of literature data and original research.
  • Development of a semiempirical correlation linking binding strength to polyion charge density and surfactant hydrophobicity.

Main Results:

  • Binding strength increases with the square of polyelectrolyte linear charge density.
  • Binding strength is directly proportional to surfactant hydrophobicity.
  • A quantitative relationship was established across various polyelectrolytes.

Conclusions:

  • The developed correlation enables prediction of binding strengths in polyelectrolyte-surfactant mixtures.
  • This provides a rational design approach for consumer healthcare products and biomedicines.
  • Deviations highlight the importance of system-specific interactions.