adsorb

/æd'sɔ:b/

Thân thiện

A scientist observes a gas adsorb onto the surface of a charcoal filter.

Definition

1. Verb:
   • To accumulate (lolecules, typically liquids or gases) on the surface of a solid or liquid: The process involves the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to a surface, creating a thin film. This is a surface phenomenon distinct from absorption, where a substance permeates the entire volume of another.

Usage and Examples

• Verb:
  • Activated charcoal is used in filters because it can adsorb many impurities from water or air.
  • Certain materials adsorb gases more effectively at lower temperatures.
  • The study measured how well the new polymer adsorbed the dye from the solution.

Advanced Usage

• Scientific Context: The term is primarily used in chemistry, physics, materials science, and environmental engineering to describe surface accumulation.
  • The catalyst's efficiency depends on its ability to adsorb reactant molecules onto its active sites.
• Passive Form: Often used in the passive voice to describe the state of the material.
  • The toxic compound was adsorbed onto the clay particles, rendering the water safer.

Variants and Related Words

• Adsorbent (noun): A material, usually solid, that has the ability to adsorb substances.
  • Silica gel is a common adsorbent used in packaging to control moisture.
• Adsorbate (noun): The substance that is adsorbed onto a surface.
  • In this experiment, the adsorbate was carbon monoxide, and the adsorbent was platinum.
• Adsorption (noun): The process or phenomenon of adsorbing.
  • The adsorption of pollutants is a key step in many water purification systems.

Synonyms

• Accumulate on the surface: A descriptive phrase for the general process.
• Bind to the surface: Often used in biochemical contexts (e.g., proteins adsorbing to a surface).

Antonyms

• Absorb: To take in or soak up a substance throughout the bulk of a material (e.g., a sponge absorbs water).
• Desorb: To release or remove an adsorbed substance from a surface.

Related Phrases and Concepts

• Physical adsorption (Physisorption): A type of adsorption caused by weak van der Waals forces.
• Chemical adsorption (Chemisorption): A type of adsorption involving the formation of chemical bonds between the adsorbate and the surface.
• Adsorption isotherm: A graph showing the relationship between the pressure (or concentration) of an adsorbate and the extent of adsorption at a constant temperature.

Học thuật

Verb

1. accumulate (liquids or gases) on the surface