The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. http://dspace-roma3.caspur.it:80 2013-05-24T03:21:30Z 2013-05-24T03:21:30Z Ricci, Maria Antonietta Bruni, Fabio Giuliani, Alessia http://hdl.handle.net/2307/355 2011-12-22T13:34:56Z 2009-09-08T22:00:00Z

<Title>"Similarities" between confined and supercooled water</Title> <Authors>Ricci, Maria Antonietta; Bruni, Fabio; Giuliani, Alessia</Authors> <Issue Date>2009-09-09</Issue Date> <Is part of>Faraday discussions</Is part of> <Volume>141</Volume> <Pages>347-358</Pages> <Abstract>Neutron diffraction and deep inelastic neutron scattering experimentsperformed on bulk stable and supercooled water compared with the sameexperiments performed on water confined in silica substrates.Similarities and differences between the two cases clearly show up, asfar as both microscopic structure and single proton dynamics areconcerned. In particular in both supercooled bulk water and water underconfinement we observe a closer average distance between firstneighbouring oxygen sites and shortening of the H-bonds. In contrastthe number of H-bonds per molecule and the number of interstitial watermolecules are severely reduced under confinement, and the second peakof the oxygen-oxygen radial distribution function is shifted to shorterdistances, compared to the bulk phase. Based on these results apossible scenario for understanding changes evidenced by deed inelasticneutron scattering when water is either confined or supercooled isproposed.</Abstract>

2009-09-08T22:00:00Z Ricci, Maria Antonietta Bruni, Fabio Giuliani, Alessia http://hdl.handle.net/2307/345 2011-12-22T13:34:34Z 2008-12-31T23:00:00Z

<Title>"Similarities" between confined and supercooled water</Title> <Authors>Ricci, Maria Antonietta; Bruni, Fabio; Giuliani, Alessia</Authors> <Issue Date>2009</Issue Date> <Is part of>Faraday Discussions</Is part of> <Volume>141</Volume> <Pages>347-358</Pages> <Abstract>Neutron diffraction and deep inelastic neutron scattering experiments performed on bulk stable and supercooled water are compared with the same experiments performed on water confined in silica substrates.Similarities and differences between the two cases clearly show up, as far as both microscopic structure and single proton dynamics are concerned. In particular in both supercooled bulk water and water under confinement we observe a closer average distance between first neighboring oxygen sites and shortening of the H-bonds. In contrast the number of H-bonds per molecule and the number of interstitial water molecules are severely reduced under confinement, and the second peak of the oxygen-oxygen radial distribution function is shifted to shorter distances, compared to the bulk phase. Based on these results a possible scenario for understanding changes evidenced by deep inelastic neutron scattering when water is either confined or supercooled is proposed.</Abstract>

2008-12-31T23:00:00Z