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

Beyer, J.; Reichenbach, H. Graf von

doi:10.1180/00098550023710025

Cited by 9 publications

(6 citation statements)

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“…The d(0 0 2) value of 1.198 nm in NaVER can be compared with the d-spacing values ranged from the interval 1.178-1.185 nm reported for monolayer hydrates of NaVER [20][21][22]. The reflection (0 0 2) of NaVER was observed at all organovermiculites, except the NaVER_2.0CA.…”

Section: Resultsmentioning

confidence: 95%

Preparation of novel organovermiculites with antibacterial activity using chlorhexidine diacetate

Holešová

Valášková

Plevová

et al. 2010

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 95%

Preparation of novel organovermiculites with antibacterial activity using chlorhexidine diacetate

Holešová

Valášková

Plevová

et al. 2010

Journal of Colloid and Interface Science

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“…In bi-hydrated Mg-vermiculite, Mg 2+ cations are located in the mid-plane of the interlayer with one sheet of H 2 O molecules on each side of this plane (Type II, Figure ). ,− According to this model, Mg is octahedrally coordinated by six H 2 O molecules, whereas additional H 2 O molecules, which are weakly bound to the cation, are located on the same plane as the six cation-bound H 2 O molecules. − A Type II configuration of H 2 O molecules was also proposed for Na-saturated vermiculite, , and for Na-, Ca-, and Li-rich altered phlogopites …”

Section: Discussionmentioning

confidence: 99%

“…Mg−vermiculite 2.69 1.19 14.36 Le Renard et al altered Ca−phlogopite 2.77 1.41 14.96 8.60 altered Na−phlogopite 2.71 1.43 14.87 10.70 altered Li−phlogopite 2.71 1.30 14.62 8.79 Beyer et al Na−vermiculite 2.70 g 1.44 g 14.85 4.00 3.9Type III ConfigurationreferencesampleO layer −H 2 O b,h cation−-H 2 O b,h d 001 e n H 2 O/ n Cat f B wat c de la Calle et al …”

Section: Discussionmentioning

confidence: 99%

New Insights on the Distribution of Interlayer Water in Bi-Hydrated Smectite from X-ray Diffraction Profile Modeling of 00l Reflections

et al. 2005

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The interlayer configuration proposed by Moore and Reynolds and commonly used to reproduce the 00ℓ reflections of bi-hydrated smectite is shown to be inconsistent with experimental X-ray diffraction data. 1 The alternative configuration of interlayer species with cations located in the mid-plane of the interlayer and one sheet of H 2 O molecules on each side of this plane is also shown to imperfectly describe the actual structure of bi-hydrated smectites. Specifically, the thermal fluctuation of atomic positions (Debye-Waller factor) used to describe the positional disorder of interlayer H 2 O molecules has to be increased to unrealistic values to satisfactorily reproduce experimental X-ray diffraction data when using this model. A new configuration is thus proposed for the interlayer structure of bi-hydrated smectite. Cations are located in the mid-plane of the interlayer whereas H 2 O molecules are scattered about two main positions according to Gaussian-shaped distributions. This configuration allows reproducing all 00ℓ reflections with a high precision, with only one new variable parameter (width of the Gaussian function). The proposed configuration is consistent with those derived from Monte-Carlo calculations and allows matching more closely the amount of interlayer water that can be determined independently from water vapor adsorption/desorption isotherm experiments. In addition, the proposed configuration of interlayer species appears valid for both dioctahedral and trioctahedral smectites exhibiting octahedral and tetrahedral substitutions, respectively, thus not allowing to differentiate these expandable 2:1 phyllosilicates from their respective interlayer configuration.

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“…Original V (Fig. 4a) is composed of complex of hydrated interstratified phases showing several basal reflections accordant with the interplanar spacing (Beyer and Graf von Reichenbach, 2002;Marcos et al, 2003). The spacing d(0 0 1) = 1.461 nm implies the existence of a two-layer hydrate, the value d(0 0 1) = 1.228 nm one-layer hydrate stages and a superstructure (d 001 = 2.210 nm) as a result of 1:1 interstratification of one-layer hydrates.…”

Section: X-ray Powder Diffractionmentioning

confidence: 98%

Preparation and characterization of antibacterial silver/vermiculites and silver/montmorillonites

Valášková

Hundáková

Kutláková

et al. 2010

Geochimica et Cosmochimica Acta

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

Cited by 9 publications

References 0 publications

Preparation of novel organovermiculites with antibacterial activity using chlorhexidine diacetate

Preparation of novel organovermiculites with antibacterial activity using chlorhexidine diacetate

New Insights on the Distribution of Interlayer Water in Bi-Hydrated Smectite from X-ray Diffraction Profile Modeling of 00l Reflections

Preparation and characterization of antibacterial silver/vermiculites and silver/montmorillonites

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