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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...
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...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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...

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Related Experiment Video

Updated: Jun 16, 2026

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
06:31

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

Published on: March 18, 2020

Polyelectrolyte-surfactant complexes on solid surface.

Sarathi Kundu1

  • 1Laboratoire de Physique des Solides, Université Paris Sud, CNRS, UMR 8502, Orsay, France. sarathi@bose.res.in

Journal of Colloid and Interface Science
|January 26, 2010
PubMed
Summary
This summary is machine-generated.

Polyelectrolyte-surfactant complexes, including DNA-dodecyltrimethylammonium bromide (DTAB) and carboxymethyl cellulose-DTAB, exhibit distinct structures. DNA-DTAB forms layered structures, while carboxymethyl cellulose-DTAB forms coil-like structures, depending on surfactant concentration.

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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

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Published on: January 25, 2018

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biopolymer Science

Background:

  • Polyelectrolyte-surfactant complexes are crucial in various applications, including drug delivery and coatings.
  • Understanding their self-assembly behavior is key to controlling material properties.
  • Hydrophilic silicon substrates offer a versatile platform for studying thin film formation.

Purpose of the Study:

  • To investigate the structural and morphological characteristics of DNA-DTAB and carboxymethyl cellulose-DTAB complexes.
  • To explore the influence of surfactant concentration on complex formation and structure.
  • To elucidate the self-assembly mechanisms of these complexes on a solid substrate.

Main Methods:

  • Horizontal deposition technique for thin film fabrication.
  • Atomic force microscopy (AFM) for surface morphology analysis.
  • X-ray reflectivity (XRR) studies for out-of-plane structure and electron density profiling.

Main Results:

  • DNA-DTAB complexes form lamellar-like multilayered structures.
  • Carboxymethyl cellulose-DTAB complexes exhibit coil-like structures.
  • At low dodecyltrimethylammonium bromide (DTAB) concentration, Gibbs layers form; at high concentrations, DTAB self-assembles into lamellar structures coexisting with the complexes.

Conclusions:

  • The study reveals distinct structural differences between DNA-DTAB and carboxymethyl cellulose-DTAB complexes.
  • Surfactant concentration critically dictates the self-assembly behavior and final morphology.
  • These findings provide insights into designing functional materials based on polyelectrolyte-surfactant interactions.