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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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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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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

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Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields...
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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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Entropy and Solvation02:05

Entropy and Solvation

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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...
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Cationic and Nonionic Surfactant Micelles in a Halogen-Free Carboxylic Acid-Based Deep Eutectic Solvent.

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Deep eutectic solvents (DES) offer green alternatives for surfactant self-assembly. This study explores how citric acid:glycerol mixtures influence cationic and nonionic surfactant micellization, revealing solvent-dependent structural changes.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Green Chemistry

Background:

  • Deep eutectic solvents (DES) are emerging as environmentally friendly solvents for various applications.
  • Surfactant behavior, including solubility and self-assembly, is highly dependent on the specific DES components and their molar ratios.
  • Understanding these interactions is crucial for designing novel nanomaterials and drug delivery systems.

Purpose of the Study:

  • To investigate surfactant behavior in halogen-free citric acid:glycerol-based DES.
  • To determine the effect of varying molar ratios on cationic surfactant micellization.
  • To explore the micellization of nonionic ethylene oxide surfactants in these DES, particularly those insoluble in common choline chloride-based systems.

Main Methods:

  • Utilized citric acid:glycerol mixtures with varying molar ratios.
  • Studied the micellization of cationic surfactants (C12TANO3, C16TANO3) and nonionic surfactants (Brij L23, Brij L4).
  • Analyzed surfactant self-assembly and micellar structures in the absence of water.

Main Results:

  • Cationic surfactants formed spherical micelles with stronger intermicellar interactions in citric acid:glycerol DES compared to choline chloride-based DES, suggesting reduced charge screening.
  • Nonionic Brij L23 formed spherical micelles in a 1:2 citric acid:glycerol mixture.
  • Nonionic Brij L4 exhibited less defined phase structures at similar concentrations.

Conclusions:

  • Citric acid:glycerol DES provide a tunable environment for surfactant self-assembly.
  • The choice of DES components and molar ratio significantly impacts micellization and intermicellar interactions.
  • These findings advance the application of DES in areas like nanomaterial templating and drug delivery.