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ILs have a wide liquid range. Some ILs do not freeze down to very low temperatures (even -150 °C), The glass transition temperature was detected below -100 °C in the case of N-methyl-N-alkylpyrrolidinium cations fluorosulfonyl-trifluoromethanesulfonylimide (FTFSI). Low-temperature ionic liquids (below 130 K) have been proposed as the fluid base for an extremely large diameter spinning liquid-mirror

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