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Solubility03:00

Solubility

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Preparation and Reactions of Sulfides02:26

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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.
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Colloids03:22

Colloids

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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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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

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Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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Esters to Carboxylic Acids: Saponification01:25

Esters to Carboxylic Acids: Saponification

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Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
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Polyoxyethylene Group-Dependent Surface Properties and Aggregation Behavior in Oleyl-Based Sulfosuccinate Systems.

Ping Li1, Zhengwei Zhang1, Jie Chai1

  • 1Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, China.

Molecules (Basel, Switzerland)
|June 13, 2025
PubMed
Summary

Oleyl-based sulfosuccinate surfactants with varying polyoxyethylene (EO) chain lengths were synthesized and studied. Longer EO chains impacted adsorption kinetics and foam stability, with specific structures forming vesicles and emulsions showing excellent stability.

Keywords:
dynamic surface tensionfoam stabilityliquid crystal emulsionoleyl-based sulfosuccinatesvesiclewetting ability

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Area of Science:

  • Surfactant Chemistry
  • Colloid and Surface Science
  • Materials Science

Background:

  • Sulfosuccinates are versatile surfactants with tunable properties.
  • Polyoxyethylene (EO) chain length significantly influences surfactant behavior.
  • Understanding structure-property relationships is crucial for developing advanced formulations.

Purpose of the Study:

  • To synthesize and characterize oleyl-based sulfosuccinates with varying EO chain lengths (MS-OE3, MS-OE5, MS-OE7).
  • To investigate the adsorption, aggregation, and performance properties of these surfactants.
  • To correlate surfactant structure with observed properties and performance in emulsions.

Main Methods:

  • Synthesis of oleyl-based sulfosuccinates.
  • Structural confirmation using FT-IR and ¹H NMR spectroscopy.
  • Surface tension measurements (equilibrium and dynamic) to determine adsorption properties.
  • Aggregation studies to observe micelle and vesicle formation.
  • Performance evaluation including foam stability and wetting ability.
  • Formulation and stability testing of liquid crystal emulsions.

Main Results:

  • Surfactants MS-OE3, MS-OE5, and MS-OE7 were successfully synthesized and characterized.
  • Critical micelle concentration (cmc) and surface tension at cmc (γcmc) were determined.
  • Adsorption kinetics decreased with increasing EO chain length.
  • MS-OE3 formed vesicles, while MS-OE5 and MS-OE7 did not at equivalent concentrations.
  • Foam stability decreased with longer EO chains; MS-OE3 showed superior wetting.
  • Liquid crystal emulsions with MS-OE7 exhibited exceptional long-term stability.

Conclusions:

  • The polyoxyethylene chain length is a critical factor in controlling the adsorption, aggregation, and performance of oleyl-based sulfosuccinates.
  • Specific structures like vesicles can be formed by tailoring the EO chain length.
  • MS-OE7 demonstrates significant potential for stable emulsion formulations.
  • These findings provide valuable insights for designing surfactants for specific applications.