Adsorbed
Adsorbed
Adsorbed (pronounced ad-sorbed, /ædˈsɔːrbd/) is a term used in Chemistry and Pharmacology to describe a process where atoms, ions, or molecules from a substance (it could be gas, liquid, or dissolved solid) adhere to a surface of an adsorbent. This is a surface-based process, unlike absorption, where the process takes place uniformly throughout the material.
Etymology
The term 'adsorbed' is derived from the Latin word 'adsorbere' which means 'to suck in' or 'to consume'. It was first used in the early 20th century to describe the process in which certain particles stick to surfaces.
Related Terms
- Adsorption: The process by which a substance is adsorbed onto a surface.
- Adsorbent: The material onto which a substance is adsorbed.
- Desorption: The process by which a substance is removed from a surface it was previously adsorbed onto.
- Absorption: A process where atoms, ions, or molecules are taken up by a material's volume, not just its surface.
- Physisorption: A type of adsorption where the forces involved are physical (van der Waals forces).
- Chemisorption: A type of adsorption where a chemical bond is formed between the surface and the adsorbate.
In the field of Pharmacology, adsorbed is often used to describe the process by which certain drugs or toxins are taken up by specific tissues in the body. For example, an Adsorbed vaccine is a vaccine in which an antigen is adsorbed onto an adjuvant to enhance the immune response.
External links
- Medical encyclopedia article on Adsorbed
- Wikipedia's article - Adsorbed
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