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.

Noun

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