X-ray and neutron scattering studies of the structure of water in a hydrogel

✍ Scribed by L. Bosio; G.P. Johari; M. Oumezzine; J. Teixeira

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 488 KB
• Volume: 188
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)85098-u

✦ Synopsis

The structure of water absorbed in polyHEMA is studied by X-ray diffraction in the vitreous state at 77 K as well as in the liquid state at room temperature. Molecular packing at the level of the first neighbors IS found similar to that in bulk water but a distortion is observed at the level of the second neighbors which is attributed to the bending of the H bonds. From the widths of the Bragg peaks of the crystalline ices from the small-angle neutron scattering results, we deduce that the pore size and the interpore distance in the swollen polyHEMA are smaller than 30 A.