Abstract
Low temperature positron annihilation lifetime spectroscopy has been utilised to understand the freezing behaviour of water–ethanol mixture confined in silica nanopores having average pore size ∼ 8 nm. The temperature of ice nucleation from supercooled water in presence of ethanol cluster inside the pore has been explored through the change in ortho-positronium (o-Ps) lifetime at low temperature. It is revealed that the confinement plays an important role in freezing of water–ethanol mixture by reducing the freezing temperature far below the bulk freezing point of the mixture. Our finding is important in understanding the partial freezing of water in water–ethanol mixture under nano-confinement in the field of separation science.
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