Ordering of water confined in hydrophilic nanopores – low temperature investigation
We propose the first neutron diffraction measurements on AlPO4-54•xH2O at low temperature, in the temperature range of 10-300 K. AlPO4-54*xH2O (hexagonal VFI structure, space group P63, a=18.9678(13) A and c=8.0997(4) A, Al18P18O72*47H2O) exhibits 1-D pores along the c direction, which are among the largest pores known for zeolites and aluminophosphates, with a diameter of 12.7 A in which H2O molecules form a disordered hydrogen-bonded network at ambient temperature. AlPO4-54*xH2O is an ideal system to probe nanoconfined water. The ordering dependence of its nanoconfined water has been studied by single-crystal X-ray diffraction, which obviously could not detect hydrogen. The experiment proposed here will allow locating the hydrogen positions, revealing the behaviour of the H-bond as a function of temperature, and will help to better define the ordering of the water near the pore wall. The results will contribute to a better understanding of the H-bonded water confined in hydrophilic nanopores as well as to the understanding of the conditions for its possible crystallization.
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ALABARSE, F. G.; BOVE Livia Eleonora; Henry E. Fischer; KLOTZ Stefan and POLIDORI Annalisa. (2016). Ordering of water confined in hydrophilic nanopores – low temperature investigation. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-07-10
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