| 释义 |
molecular sieve
molecular sieve n (Elements & Compounds) chem a material that can absorb large amounts of certain compounds while not absorbing others and is thus suitable for use in separating mixtures molec′ular sieve′
n. a compound with molecule-size pores, as some sodium aluminum silicates, that chemically locks molecules in them: used in purification and separation processes. [1925–30] molecular sieve
molecular sieve[mə′lek·yə·lər ′siv] (chemistry) A naturally occurring or synthetic zeolite characterized by the ability to undergo dehydration with little or no change in crystal structure, thereby offering a very high surface area for adsorption of foreign molecules. molecular sieveAn adsorbent composed of porous aluminosilicates with pores of uniform molecular dimensions which will selectively absorb molecules of the substance to be gathered.molecular sieve
mo·lec·u·lar sievea gellike material with pore sizes of such ranges as to exclude molecules above certain sizes; used in fractionating or purifying macromolecules.molecular sieve A material (e.g., oxides: silicate, aluminate, zeolite crystals with pores) which is capable of separating molecules based on size.molecular sieveA type of sieve in which the molecular material present in the gel or crystal will adsorb molecules of a certain kind and let others pass.See also: sieveThesaurusSeesieve |