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Related Concept Videos

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...
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...
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...
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)...
Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...

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Related Experiment Video

Updated: Jun 23, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles
08:44

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Complexes between high charge density cationic polyelectrolytes and anionic single- and double-tail surfactants.

C Mantzaridis1, G Mountrichas, S Pispas

  • 1Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece.

The Journal of Physical Chemistry. B
|April 25, 2009
PubMed
Summary

Polyelectrolyte/surfactant complexes self-assemble into nanoparticles. Their size and stability depend on surfactant type and concentration, influencing nanoparticle characteristics.

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Area of Science:

  • Polymer Science
  • Colloid and Surface Chemistry
  • Materials Science

Background:

  • Polyelectrolyte/surfactant complexes are crucial in various applications.
  • Understanding their self-assembly is key to controlling material properties.

Purpose of the Study:

  • To investigate the self-assembly of polyelectrolyte/surfactant complexes.
  • To determine how surfactant properties influence nanoparticle formation and stability.

Main Methods:

  • Fluorescence spectroscopy
  • Electrophoretic methods
  • Dynamic and static light scattering
  • Atomic force microscopy

Main Results:

  • Self-assembly into spherical, polydisperse nanoparticles is achievable.
  • Nanoparticle size, stability, and charge are tunable.
  • Critical aggregation concentrations vary with surfactant type.
  • Polyelectrolyte chain hydrophobicity impacts colloidal stability.

Conclusions:

  • The study demonstrates controlled nanoparticle formation via polyelectrolyte/surfactant complexation.
  • Surfactant characteristics and concentration are critical factors in self-assembly.
  • Findings offer insights into designing functional nanomaterials.