2016 年 58 巻 1 号 p. 24-29
Nano-confinement of water (“water pocket”) in room-temperature ionic liquid (RTILs) was experimentally proved by a complementary use of small angle X-ray and neutron scattering. The size of the water pocket was estimated to be 2 ~ 3 nm. The water pocket is loosely packed and size-tunable in the RTIL. Hydrogen bonding water of the water pocket is different from that of bulk water. The water pocket is modified by intrinsic nanodomains in the RTILs. With reflecting slow dynamic fluctuations on the nanoscale, the polar/non-polar nanodomains in the RTILs are utilized for loosely packed nano-confinement in bioscience.