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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...
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Entropy and Solvation02:05

Entropy and Solvation

The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ ≥ 15); an...
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...
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:

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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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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

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Surfactant effects on SF6 hydrate formation.

Bo Ram Lee1, Ju Dong Lee, Hyun Ju Lee

  • 1School of Materials Science and Engineering, Pusan National University, Busan 609-735, Republic of Korea.

Journal of Colloid and Interface Science
|December 9, 2008
PubMed
Summary

Surfactants accelerate sulfur hexafluoride (SF(6)) hydrate formation, a key step in capturing this potent greenhouse gas. The study found surfactants enhance SF(6) gas uptake into hydrate crystals.

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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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09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Materials Science

Background:

  • Sulfur hexafluoride (SF(6)) is a potent greenhouse gas used in various industrial applications.
  • Effective methods for SF(6) capture from waste streams are crucial for environmental protection.
  • Hydrate crystal formation presents a promising separation technique for SF(6).

Purpose of the Study:

  • To investigate the impact of surfactants on the kinetics of SF(6) hydrate formation.
  • To evaluate the efficacy of different surfactant concentrations and types as kinetic promoters.
  • To understand the mechanism by which surfactants influence SF(6) hydrate crystallization.

Main Methods:

  • SF(6) hydrate formation experiments were conducted in aqueous solutions with varying concentrations (0.00-0.20 wt%) of Tween 20, SDS, and LABS.
  • Experiments were performed in a semi-batch stirred vessel at a constant temperature (276.2 K) and pressure (0.78 MPa).
  • In situ Raman spectroscopy was utilized to analyze gas consumption and hydrate formation dynamics.

Main Results:

  • All tested surfactants demonstrated kinetic promoter behavior, significantly enhancing SF(6) hydrate formation rates.
  • SF(6) hydrate formation was observed to occur in two distinct stages, with the second stage exhibiting the most rapid kinetics.
  • Raman spectroscopy indicated that surfactants likely increase the gas filling rate into hydrate cavities, leading to higher gas consumption.

Conclusions:

  • Surfactants act as effective kinetic promoters for SF(6) hydrate formation.
  • The addition of surfactants accelerates the capture of SF(6) from gas streams via hydrate crystallization.
  • Understanding these mechanisms can optimize SF(6) separation technologies for environmental remediation.