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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...
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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...
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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...
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Solution, Solubility, and Solubility Equilibrium
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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 9, 2026

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Polyelectrolyte-surfactant complexes with long range order.

Isabel E Pacios1, Björn Lindman, Krister Thuresson

  • 1Dep. Fisicoquímica (CTFQ), Facultad de Ciencias, Universidad a Distancia, 28040 Madrid, Spain. ipacios@ccia.uned.es

Journal of Colloid and Interface Science
|December 11, 2007
PubMed
Summary
This summary is machine-generated.

Carboxymethyl cellulose (CMC) and modified CMC form hexagonal precipitates with surfactants. Interactions depend on polymer structure, indicating hydrophobic chains may reside in aqueous regions.

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Published on: January 25, 2018

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Colloid Science

Background:

  • Carboxymethyl cellulose (CMC) and its derivatives are widely used polymers.
  • Surfactants are crucial in various industrial applications.
  • Understanding polymer-surfactant interactions is key for material design.

Purpose of the Study:

  • To investigate the phase behavior of carboxymethyl cellulose (CMC) or hydrophobically modified CMC with oppositely charged surfactants.
  • To characterize the structure and composition of the formed precipitate.
  • To elucidate the interplay between electrostatic and hydrophobic interactions.

Main Methods:

  • Preparation of aqueous mixtures of CMC (or modified CMC) and benzyldimethyltetradecylammonium chloride.
  • Characterization of the precipitate formed at specific polymer and surfactant concentrations.
  • Analysis of precipitate composition, water content, and lattice parameter.
  • Investigation of the influence of polymer/surfactant ratio on phase behavior.

Main Results:

  • A precipitate with hexagonal order formed under specific conditions (0.18% polymer, high surfactant content).
  • Precipitate composition remained relatively constant in water content but showed slight polymer decrease with varying surfactant content.
  • Lattice parameter decreased with increasing polymer/surfactant ratio, faster for CMC than modified CMC.
  • Interactions were non-additive, suggesting a dependence on the polymer's substitution degree.

Conclusions:

  • Electrostatic and hydrophobic interactions in these systems are complex and non-additive.
  • The degree of substitution in CMC significantly influences the interaction dynamics.
  • Structural analysis suggests hydrophobic chains of modified CMC may extend into the aqueous phase within the hexagonal structure.