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Remnant hydration

The tenacious retention of molecules of hydrated water by the oxoanions adds to the difficulty of designing receptors, for example, using computational methods. In most circumstances the anion must be considered as including some level of remnant hydration involving bound water molecules which alter its shape, polarity and hydrogen bonding properties. On the basis of present structural evidence we can see no way to predict the disposition of such hydration even in the solid state. [Pg.200]

Cover illustration The cover art shows an eroding ancient Martian shoreline with sedimentary rock outcrops and ice remnants of a former lake, including rock deposits similar to those now being explored by the Mars Opportunity rover. The ancient lake is shown in the cutaway cross section at bottom right as it once may have been, with an ice-covered liquid brine lake and bubbles associated with gas hydrates and/or life. [Pg.255]

The hydration product occupies more space than the cement from which it is formed, and the capillary pores were regarded as the remnants of the initially water-filled space. Their volume thus decreases, and that of the gel pores increases, as hydration proceeds. Evidence from water vapour sorption isotherms indicated that the hydration product was composed of solid units having a size of about 14 nm, with gel pores some 2 nm across (P34). The width of the capillary pores could not be determined from the available data, but they were considered to be generally much wider than the gel pores, though tending to become narrower as the water-filled space was used up, and thus in some regions indistinguishable from gel pores. [Pg.247]

Formation of highly hydrated, thread-like remnants of the silicate framework (Tazaki and Fyfe, 1987 Nater and Bouabid, 1990). [Pg.177]

Figure 15. Wet preparation of waterlogged Salix sp. wood from Somerset Levelsy 6000-year-old Sweet Track site, England. A. Light microscopy photomicrograph. The hydrated wood cells contain amorphous cell wall remnants that can be seen by comparison with Figure 15B. B. Polarized light microscopy photomicrograph. The birefringent primary wall-middle lamella complex can be seen in the hydrated wood cells. Figure 15. Wet preparation of waterlogged Salix sp. wood from Somerset Levelsy 6000-year-old Sweet Track site, England. A. Light microscopy photomicrograph. The hydrated wood cells contain amorphous cell wall remnants that can be seen by comparison with Figure 15B. B. Polarized light microscopy photomicrograph. The birefringent primary wall-middle lamella complex can be seen in the hydrated wood cells.
Fig. 21 (a) Open-framework architecture of S-[ Mn(HL)(HjO) jMn- Mo(CN)7 2"2HjO (water molecules are represented as red spheres). Field cooled magnetization (o,H= 100 Oe), zero field cooled ( ), and remnant magnetization (0) as a function of temperature for the hydrated (b) and dehydrated (c) solids. Reprinted with permission from ref 204. Copyright 2007, American Chemical Society... [Pg.245]


See other pages where Remnant hydration is mentioned: [Pg.200]    [Pg.200]    [Pg.217]    [Pg.114]    [Pg.165]    [Pg.178]    [Pg.500]    [Pg.631]    [Pg.1014]    [Pg.207]    [Pg.38]    [Pg.333]    [Pg.78]    [Pg.207]    [Pg.350]   
See also in sourсe #XX -- [ Pg.189 , Pg.190 , Pg.191 , Pg.192 , Pg.193 , Pg.194 , Pg.195 , Pg.196 , Pg.197 , Pg.198 , Pg.199 ]




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