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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

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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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Micelles01:30

Micelles

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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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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Surface Tension of Fluid01:22

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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.
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Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Surfactant Binding to Polymer-Water Interfaces in Atomistic Simulations.

Zifeng Li1, Kristen A Fichthorn1, Scott T Milner1

  • 1Department of Chemical Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.

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|June 28, 2016
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Summary

Molecular dynamics simulations reveal how sodium dodecyl sulfate (SDS) surfactant interacts with acrylate latex particles. Surface charge heterogeneity significantly influences SDS binding, impacting waterborne suspension and coating design.

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Area of Science:

  • Colloid and Surface Science
  • Computational Chemistry
  • Materials Science

Background:

  • Attractive interactions between additives and particle surfaces are crucial for designing waterborne suspensions and coatings.
  • Sodium dodecyl sulfate (SDS) is a widely used industrial surfactant in these applications.

Purpose of the Study:

  • To determine the potential of mean force for SDS interacting with acrylate latex particles using atomistic molecular dynamics (MD) simulations.
  • To investigate the influence of SDS adsorption, ionic strength, and particle surface charge on binding free energy.

Main Methods:

  • Atomistic molecular dynamics (MD) simulations were employed.
  • Calculated the potential of mean force for SDS adsorption onto acrylate latex particles.
  • Analyzed the contributions of the surfactant's hydrophobic tail and charged headgroup to the interaction potential.

Main Results:

  • The potential of mean force for SDS is a sum of contributions from its hydrophobic tail and charged headgroup.
  • The hydrophobic tail interaction follows a linear potential, while the headgroup interaction is influenced by surface charge and zeta potential.
  • Multivalent charged 'hairs' on acrylate latex create a heterogeneous surface, leading to varied SDS binding strengths.

Conclusions:

  • Surface heterogeneity on acrylate latex particles significantly affects SDS surfactant binding.
  • Understanding these interactions is key for optimizing the performance of waterborne suspensions and coatings.
  • MD simulations provide valuable insights into molecular interactions at interfaces.