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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...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
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...
Surface Tension of Fluid01:22

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Typical Model Studies01:30

Typical Model Studies

Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.

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Related Experiment Video

Updated: Jun 13, 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

Surface behavior of a model surfactant: a theoretical simulation study.

Shi-Ming Yuan1, Hui Yan, Kai Lv

  • 1School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.

Journal of Colloid and Interface Science
|May 19, 2010
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations reveal sodium dodecylbenzenesulfonate (SDBS) surfactant adsorption at the air/water interface is driven by hydrophobic interactions. SDBS aggregates rapidly, adopting a specific orientation due to favorable alkyl chain associations.

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Last Updated: Jun 13, 2026

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Extraction and Characterization of Surfactants from Atmospheric Aerosols
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Extraction and Characterization of Surfactants from Atmospheric Aerosols

Published on: April 21, 2017

Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Surface Science

Background:

  • Sodium dodecylbenzenesulfonate (SDBS) is a widely used anionic surfactant.
  • Understanding surfactant behavior at interfaces is crucial for various applications.
  • Computational methods offer insights into molecular interactions and dynamics.

Purpose of the Study:

  • To investigate the molecular properties and dynamic behavior of SDBS.
  • To elucidate the mechanism of SDBS adsorption at the air/water interface.
  • To determine the driving forces behind SDBS interfacial aggregation and orientation.

Main Methods:

  • Quantum mechanics (QM) calculations were employed to determine molecular properties of SDBS in vacuum and solution.
  • Molecular dynamics (MD) simulations were used to simulate the dynamic behavior of SDBS from bulk solution to the air/water interface.
  • Analysis focused on head-group interactions, ion pairing, and aggregation dynamics.

Main Results:

  • QM calculations indicated that two head-group oxygen atoms interact with a Na(+) ion in SDBS.
  • MD simulations showed Na(+) must overcome an energy barrier for stable ion pair formation in solution.
  • SDBS rapidly aggregates at the air/water interface, adopting a preferred orientation driven by hydrophobic alkyl chain interactions.

Conclusions:

  • The study provides a detailed molecular-level understanding of SDBS behavior in solution and at interfaces.
  • Favorable hydrophobic interactions of the surfactant's alkyl chains are the primary drivers for interfacial adsorption.
  • Computational findings are consistent with experimental observations regarding ion pairing and adsorption.