Interlayer Water Molecules in Vanadium Pentoxide Hydrate, V2O5.cntdot.nH2O. 5. Dynamic Motion Analyzed by Impedance Measurements

1994 ◽  
Vol 98 (8) ◽  
pp. 2129-2133 ◽  
Author(s):  
Naoki Uchida ◽  
Shigeharu Kittaka
Keyword(s):  
Vanadium Pentoxide ◽  
Water Molecules ◽  
Interlayer Water ◽  
Impedance Measurements ◽  
Dynamic Motion

Interlayer water molecules of vanadium pentoxide hydrate, V2O5nH2O

1992 ◽  
Vol 154 (1) ◽  
pp. 216-224 ◽  
Author(s):  
Shigeharu Kittaka ◽  
Tomoyuki Suetsugi ◽  
Rika Kuroki ◽  
Mahiko Nagao
Keyword(s):  
Vanadium Pentoxide ◽  
Water Molecules ◽  
Interlayer Water

Interlayer Water Molecules in Vanadium Pentoxide Hydrate, V2O5·nH2O. 7. Quasi-elastic Neutron Scattering Study

Langmuir ◽  
2000 ◽  
Vol 16 (26) ◽  
pp. 10559-10563 ◽  
Author(s):  
Shuichi Takahara ◽  
Shigeharu Kittaka ◽  
Yasushige Kuroda ◽  
Toshio Yamaguchi ◽  
Hiroyuki Fujii ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Vanadium Pentoxide ◽  
Water Molecules ◽  
Interlayer Water ◽  
Elastic Neutron ◽  
Scattering Study ◽  
Elastic Neutron Scattering ◽  
Neutron Scattering Study

Interlayer Water Molecules in Vanadium Pentoxide Hydrate. 8. Dynamic Properties by Quasi-Elastic Neutron Scattering

Langmuir ◽  
2005 ◽  
Vol 21 (4) ◽  
pp. 1389-1397 ◽  
Author(s):  
Shigeharu Kittaka ◽  
Shuichi Takahara ◽  
Toshio Yamaguchi ◽  
Marie-Claire Bellissent Funel
Keyword(s):  
Neutron Scattering ◽  
Vanadium Pentoxide ◽  
Dynamic Properties ◽  
Water Molecules ◽  
Interlayer Water ◽  
Elastic Neutron ◽  
Elastic Neutron Scattering

Restricted Rotational Motion of InterlayerWaterMolecules in Vanadium Pentoxide Hydrate, V2O5·n D2O, as Studied by Deuterium NMR

2002 ◽  
Vol 57 (6-7) ◽  
pp. 419-424 ◽  
Author(s):  
Sadamu Takeda ◽  
Yuko Gotoh ◽  
Goro Maruta ◽  
Shuichi Takahara ◽  
Shigeharu Kittaka
Keyword(s):  
Double Layer ◽  
Vanadium Pentoxide ◽  
Rotational Motion ◽  
Interlayer Space ◽  
Layer Structure ◽  
Bond Distance ◽  
Adsorbed Water ◽  
Deuterium Nmr ◽  
Water Molecules ◽  
Layer Structures

The rotational behavior of the interlayer water molecules of deuterated vanadium pentoxide hydrate, V2O5.nD2O, was studied by solid-state deuterium NMR for the mono- and double-layer structures of the adsorbed water molecules. The rotational motion was anisotropic even at 355 K for both the mono- and double-layer structures. The 180° flipping motion about the C2-symmetry axis of the water molecule and the rotation around the figure axis, which makes an angle Ɵ with the C2-axis, occurred with the activation energy of (34±4) and (49±6) kJmol-1, respectively. The activation energies were almost independent of the mono- and double-layer structures of the water molecules, but the angle Ɵ made by the two axes varied from 33° for the monolayer to 25° for the double-layer at 230 K. The angle started to decrease above 250 K (e. g. the angle was 17 at 355 K for the double-layer structure). The results indicate that the average orientation of the water molecules in the two dimensional interlayer space depends on the layer structure and on the temperature. From the deuterium NMR spectrum at 130 K, the quadrupole coupling constant e2Qq/h = 240 kHz and the asymmetry parameter η= 0.12 were deduced. These values indicate the average hydrogen bond distance R(O H) = 2.0 Å for the D2O molecules in the 2D-interlayer space

Cation exchange in synthetic manganates: II. The structure of an alkylammonium-saturated phyllomanganate

Clay Minerals ◽  
1986 ◽  
Vol 21 (5) ◽  
pp. 957-964 ◽  
Author(s):  
E. Paterson ◽  
D.R. Clark ◽  
D. Russell ◽  
R. Swaffield
Keyword(s):  
Chain Length ◽  
Photoelectron Spectroscopy ◽  
Hydrocarbon Chain ◽  
Exchange Capacity ◽  
Basal Spacing ◽  
Water Molecules ◽  
Interlayer Water ◽  
X Ray ◽  
Alkyl Chains ◽  
Hydrocarbon Chain Length

AbstractA synthetic phyllomanganate saturated with a series of primary alkylammonium cations has been examined using XRD, chemical analysis and X-ray photoelectron spectroscopy. A linear relationship exists between the basal spacing of the saturated alkylammonium-manganate and the hydrocarbon chain length in the interlayer, and from the gradient it is concluded that the alkyl chains are perpendicular to the manganate sheet. This orientation is a function of both the charge density and the presence of a layer of water molecules immediately adjacent to the manganate basal surfaces. Evacuation results in the loss of this interlayer water and the structure of the organo-manganate is considerably disrupted. The extent to which the interlayer arrangement can be reinstated by rehydration is dependent on the chain length of the saturating organo-cation. For cations of chain length > C6 the C contents suggest that cation in excess of the exchange capacity is present in the interlayer, but the absence of any compensating anion and the release of amine on evacuation suggests that the excess C arises from the presence of free amine.

The infra-red spectra of talc, saponite, and hectorite

1958 ◽  
Vol 31 (241) ◽  
pp. 829-845 ◽  
Author(s):  
V. C. Farmer
Keyword(s):  
Hydrogen Bond ◽  
Dipole Moment ◽  
Absorption Spectra ◽  
Water Molecules ◽  
Weak Hydrogen Bond ◽  
Interlayer Water ◽  
Spectral Changes ◽  
Infra Red ◽  
Theoretical Predictions ◽  
Stretching Vibrations

SummaryThe absorption spectra of talc, saponite, and hectorite between 4000 and 400 cm. −1 are closely related, although the bands of the smectites are more diffuse as a result of isomorphous substitutions in the tale structure. Using oriented specimens, vibrations in which the change of dipole moment is perpendicular to the sheets of the minerals are identified, and the results compared with theoretical predictions. Three bands arising from the stretching vibrations of interlayer water molecules in the smectites are distinguished, one of which corresponds to a very weak hydrogen bond. Spectral changes arising from vigorous grinding are discussed.

An extended revision of the interlayer structures of one- and two- layer hydrates of Na- vermiculite

Clay Minerals ◽  
2002 ◽  
Vol 37 (1) ◽  
pp. 157-168 ◽  
Author(s):  
J. Beyer ◽  
H. Graf Von Reichenbach
Keyword(s):  
Rotational Correlation Time ◽  
Silicate Layer ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Interlayer Water ◽  
Partial Loss ◽  
Stacking Order ◽  
Quasielastic Neutron ◽  
Quasielastic Neutron Scattering ◽  
Water Contents

AbstractThe interlayer structures in one- and two-layer hydrates of Na-vermiculite are described by presenting the positional parameters of their constituent atoms, including protons.The revision of these structures has been accomplished by: (1) determining accurate water contents of the two hydrates by thermoanalysis (TG, DSC); (2) using earlier X-ray diffraction data published by Slade et al.(1985) and de la Calle et al. (1984) as a reference; and (3) applying least-squares refinements when considering the constraints for atomic distances and bond angles between interlayer constituents.In the 1.485 nm hydrate of Na-vermiculite (nH2O/nNa ≈ 4), sharing edges of Na(OH2)6 octahedra cause their chainlike arrangement. The chains are aligned along [100] and are stabilized by H-bonds between interlayer water molecules and oxygens of the silicate layer. The partial loss of these bonds during dehydration forces the stacking order to change from V3 to Vc in the resulting 1.185 nm (nH2O/nNa ≈ 2) hydrate.This new understanding may help to explain differences in the rotational correlation time of water molecules between one- and two-layer hydrates of vermiculite as observed by quasielastic neutron scattering (Swenson et al., 2000).

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