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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).
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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...
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: Jul 15, 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

Published on: March 18, 2020

Interaction forces between particles stabilized by a hydrophobically modified inulin surfactant.

Jérémie Nestor1, Jordi Esquena, Conxita Solans

  • 1Departament de Tecnologia de Tensioactius, Institut d'Investigacions Químiques i Ambientals de Barcelona (IIQAB), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.

Journal of Colloid and Interface Science
|April 17, 2007
PubMed
Summary

Hydrophobically modified inulin (INUTEC SP1) forms stable layers on particles, explaining their resistance to flocculation even in high salt concentrations. This polymeric surfactant adsorption provides significant stability to dispersions.

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Area of Science:

  • Colloid and Surface Science
  • Polymer Science
  • Materials Science

Background:

  • Polymeric surfactants are crucial for stabilizing colloidal dispersions.
  • Understanding adsorption behavior is key to controlling particle interactions and stability.
  • Hydrophobically modified polysaccharides offer unique properties for surface modification.

Purpose of the Study:

  • To determine the adsorption isotherm of hydrophobically modified inulin (INUTEC SP1) on polystyrene (PS) and poly(methyl methacrylate) (PMMA) particles.
  • To investigate the interaction forces between adsorbed layers of INUTEC SP1 using atomic force microscopy (AFM).
  • To explain the high stability of INUTEC SP1-coated particles in high electrolyte concentrations.

Main Methods:

  • Adsorption isotherm measurements on PS and PMMA particles.
  • Atomic Force Microscopy (AFM) to measure interaction forces between adsorbed polymer layers.
  • Rheology measurements to determine adsorbed layer thickness.
  • Stability tests in varying electrolyte (Na2SO4) concentrations.

Main Results:

  • INUTEC SP1 exhibited high affinity adsorption isotherms on both PS and PMMA particles.
  • Attractive forces were observed between adsorbed INUTEC SP1 layers, lower than predicted by van der Waals forces.
  • The adsorbed polymer layer thickness was approximately 9 nm, determined by AFM and rheology.
  • Particles remained stable against flocculation up to 1.5 mol dm(-3) Na2SO4.

Conclusions:

  • The adsorption behavior and inter-layer forces of INUTEC SP1 explain the high stability of coated particles.
  • Multipoint attachment with loops at the solid/liquid interface contributes to effective stabilization.
  • INUTEC SP1 is a promising polymeric surfactant for creating stable colloidal dispersions in challenging environments.