Selective removal of 90Sr and 60Co from aqueous solution using N-aza-crown ether functional poly(NIPAM) hydrogels was written by Deli, Dario;Law, Kathleen;Liu, Zuguang;Crouch, David J.;Livens, Francis R.;Yeates, Stephen G.. And the article was included in Reactive & Functional Polymers in 2012.Name: 1,4,7,10-Tetraoxa-13-azacyclopentadecane This article mentions the following:
The ability of temperature and pH responsive cross-linked poly(NIPAM-co-AAc) hydrogel beads containing covalently bound N-aza-crown ethers to selectively complex 90Sr and 60Co under competitive and non-competitive conditions is demonstrated using a combination of autoradiog. and scintillation measurements. Due to the presence of copolymerized acrylic acid, which is incorporated to introduce pH responsive behavior as well as acting as the site of covalent attachment of the N-aza-crown ether, the decrease in particle diameter as a function of increasing temperature on going through the LCST of PNIPAM is reduced in the presence of electrolyte. At pH 2 no complexation of either 90Sr or 60Co was observed At pH 7 the incorporation of acrylic acid under non-competitive conditions results in the ability to complex ca. 90% 90Sr and 60Co which increases to between 94% and 96% on inclusion of N-aza-crown ether. Under competitive conditions the hydrogels lose the ability to selectively complex 90Sr, although the selectivity for 60Co was enhanced in the presence of N-aza-crown ether. Subsequent recovery of bound 60Co from the hydrogel on lowering to pH 2 was only partially successful, and lead to a decrease in the swelling behavior on readjustment to pH 7. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3Name: 1,4,7,10-Tetraoxa-13-azacyclopentadecane).
1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. But on the other hand, ethers undergo cleavage by reaction with acids. Ethyl ether is an excellent solvent for extractions and for a wide variety of chemical reactions. It is also used as a volatile starting fluid for diesel engines and gasoline engines in cold weather. Dimethyl ether is used as a spray propellant and refrigerant. Methyl t-butyl ether (MTBE) is a gasoline additive that boosts the octane number and reduces the amount of nitrogen-oxide pollutants in the exhaust. The ethers of ethylene glycol are used as solvents and plasticizers.Name: 1,4,7,10-Tetraoxa-13-azacyclopentadecane
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem