What does chemisorb mean?
Chemisorb means to attach to a surface through a chemical bond. When a gas or dissolved molecule chemisorbs onto a solid, it does not merely cling there through weak physical attraction; instead, electrons are shared or transferred, forming a genuine chemical linkage between the molecule and the atoms of the surface. This distinguishes chemisorption from physisorption, where substances like nitrogen adhere only through van der Waals forces at low temperatures. Chemisorption tends to be highly specific, strong, and often irreversible under ordinary conditions, which is precisely why it underpins catalysis: many industrial catalysts work because reactant molecules chemisorb onto their surfaces, weakening internal bonds and making reactions easier. The verb is standard vocabulary in chemistry, surface science, and materials research, appearing mainly in scholarly and technical writing rather than everyday speech.
verbTo become attached to a surface by means of a chemical bond, as opposed to weaker physical forces; used especially of gases or molecules binding chemically to the surface of a solid.
- To undergo or cause chemical adsorption — the formation of a chemical bond between a substance and the surface of a solid or liquid.
"Oxygen molecules chemisorb strongly onto the platinum surface, forming a stable monolayer that catalyzes the reaction."
"The catalyst works because hydrogen atoms chemisorb readily onto its nickel surface."
"In this experiment, carbon monoxide was allowed to chemisorb on finely divided iron."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chemisorb
Chemisorb is a twentieth-century scientific coinage formed from the combining form 'chemo-' (from Greek 'khēmeia', relating to chemistry) plus 'sorb', a shortened form of absorb and adsorb, which derive from Latin 'sorbere' meaning to suck in or swallow up. The related noun chemisorption emerged in early twentieth-century surface-chemistry literature as scientists distinguished chemical from physical adsorption. Its closest relatives in modern usage are absorb, adsorb, and their derived nouns, all tracing back to the same Latin root.
How chemisorb is actually used
A technical term confined almost entirely to chemistry, surface science, and materials science. It appears chiefly in academic writing and textbooks, often in the passive or intransitive constructions ('molecules chemisorb onto…'). It contrasts explicitly with physisorption in scientific discussion.
Easily confused with chemisorb
To physisorb is to adhere to a surface through weak van der Waals (physical) forces, whereas to chemisorb involves an actual chemical bond and far stronger attachment.