colloidal solution

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colloidal solution

A scientist stirs a beaker containing a colloidal solution.

Definition
  1. Noun:
    • A type of colloid: A colloidal solution is a specific kind of colloid, which is a mixture where one substance is microscopically dispersed throughout another.
    • A solid suspended in a liquid: It specifically refers to a system where very fine solid particles are evenly distributed and suspended within a continuous liquid phase. The particles are larger than individual molecules but small enough to not settle out quickly under gravity.
Usage
  • General Scientific Context: The term is used primarily in chemistry and material science to describe stable mixtures like paints, inks, or certain medicines.
  • Key Characteristic: It describes a state between a true solution (where particles are dissolved at the molecular level) and a coarse suspension (where particles settle out).
Examples
  • Noun:
    • Milk is a common example of a colloidal solution where fat globules are dispersed in water.
    • The laboratory prepared a colloidal solution of gold nanoparticles for the experiment.
    • Ink used in pens is often a colloidal solution of pigment in a liquid.
Advanced Usage
  • "Form a colloidal solution": The process of creating such a mixture.
    • When the polymer is mixed with the solvent under high shear, it can form a stable colloidal solution.
  • "Stability of a colloidal solution": Refers to how long the dispersed particles remain suspended without aggregating or settling.
    • The zeta potential is a key factor affecting the stability of a colloidal solution.
Variants and Related Words
  • Colloid (n): The general category of mixtures that includes colloidal solutions, gels, aerosols, etc.
    • Fog is a colloid of liquid droplets in air.
  • Colloidal suspension (n): Often used synonymously with "colloidal solution," though sometimes "suspension" implies slightly larger particles.
  • Sols (n): Another term for colloidal solutions, especially when the continuous phase is a liquid.
Synonyms
  • Colloidal dispersion: A more general term emphasizing the dispersed state of the particles.
  • Sol: A technical term often used interchangeably in chemistry.
Related Phrases
  • Tyndall effect: The scattering of light by particles in a colloidal solution, which makes the beam visible.
    • The Tyndall effect is a simple way to identify a colloidal solution.
colloidal solution

A scientist stirs a beaker containing a colloidal solution.

Noun
  1. a colloid that has a continuous liquid phase in which a solid is suspended in a liquid

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