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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...
Breathing01:05

Breathing

The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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...
Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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,...

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Updated: Jun 22, 2026

Extraction and Characterization of Surfactants from Atmospheric Aerosols
09:34

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Published on: April 21, 2017

Surfactants and the environment.

P A Gilbert1, R Pettigrew

  • 1Unilever Research, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral, Merseyside L63 3JW.

International Journal of Cosmetic Science
|May 27, 2009
PubMed
Summary
This summary is machine-generated.

Anionic surfactants in detergents are widely distributed but pose no environmental hazard. Studies confirm current levels in personal products are safe for sewage treatment, aquatic life, and crops.

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Last Updated: Jun 22, 2026

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Area of Science:

  • Environmental Chemistry
  • Ecotoxicology

Background:

  • Anionic surfactants are common in detergents and personal care products.
  • Their widespread use leads to significant environmental distribution upon disposal.

Purpose of the Study:

  • To assess the environmental hazard posed by anionic surfactants.
  • To estimate the highest likely environmental concentrations of these compounds.

Main Methods:

  • Estimating environmental concentrations based on usage, water consumption, and surfactant properties.
  • Evaluating biodegradation and treatability of surfactants.
  • Determining the margin of safety between estimated concentrations and effect levels.

Main Results:

  • Laboratory studies on specific anionic surfactants (linear alkyl benzene sulfonates, primary alkyl sulfates, linear alkyl ether sulfates, secondary alkane sulfonates) showed no environmental hazard.
  • Environmental monitoring data confirmed these findings.

Conclusions:

  • Current levels of tested anionic surfactants in detergents and personal products do not present a hazard to the environment.
  • The margin of safety is adequate for sewage treatment, aquatic organisms, and crops.