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Persistent URL http://purl.org/net/epubs/work/29464
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Record Id 29464
Title Dynamics of water in a molecular sieve by quasi-elastic neutron scattering
Abstract We have investigated the dynamics of water confined in a molecular sieve, with a cylindrical pore diameter of 10 Å, by means of quasielastic neutron scattering (QENS). Both the incoherent and coherent intermediate scattering functions I(Q,t) were determined by time-of-flight QENS and the neutron spin-echo technique, respectively. The results show that I(Q,t) is considerably more stretched in time with a slightly larger average relaxation time in the case of coherent scattering. From the Q dependence of I(Q,t) it is clear that the observed dynamics is almost of an ordinary translational nature. A comparison with previous dielectric measurements suggests a possible merging of the α and β relaxations of the confined water at T = 185 K, although the α relaxation cannot be directly observed at lower temperatures due to the severe confinement. The present results are discussed in relation to previous results for water confined in a Na-vermiculite clay, where the average relaxation time from spin-echo measurements was found to be slower than in the present system (particularly at low temperatures).
Organisation CCLRC , ISIS , ISIS-IRIS
Keywords Materials , ISIS 2005
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Language English (EN)
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Journal Article J Phys Chem 122 (2005): 084505. doi:10.1063/1.1850902 2005