The frequency of the HOH bending fundamental in solids and liquids

Falk, Michael

doi:10.1016/0584-8539(84)80027-6

Cited by 198 publications

(182 citation statements)

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“…The first notification concerning the existence of IR spectral bands due to water bending motions is present in the paper by Falk [28]. However, the lower frequency limit for this mode noted in the mentioned paper (1582 cm -1 ) is only slightly below the gas phase value.…”

Section: A Survey Of Experimental Findingsmentioning

confidence: 90%

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Low Bending Vibrations of Crystalline Water Molecules: An Ongoing Quest or a Final Word – Topical Review – A Tribute to Academician Bojan Šoptrajanov

Pejov¹,

Jovanovski²

2017

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The main aim of this topical review is to provide a concise but yet complete overview of the research that has been done in the field of low-lying crystalline water bending vibrations. Both theoretical and experimental work in the field is reviewed, and the most important dilemmas and obstacles hampering a direct explanation of the phenomenon are outlined. The present status in this field is also overviewed and clarified. While this topical review has mostly been focused on crystalline water molecules in crystalline hydrates and their vibrational properties, also some other interesting and exciting systems that have recently attracted the attention of the scientific community are covered. These included water absorbed on surfaces as well as water at the air-water interfaces.

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Section: A Survey Of Experimental Findingsmentioning

confidence: 90%

“…Due to all these reasons, O-H(D) stretching vibrations in crystalline water molecules have been studied a lot, and numerous spectra-structure correlations have even been established in the literature [e.g. [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Low Bending Vibrations of Crystalline Water Molecules: An Ongoing Quest or a Final Word – Topical Review – A Tribute to Academician Bojan Šoptrajanov

Pejov¹,

Jovanovski²

2017

Contributions

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“…We believe, therefore, that II is affected by H-O-H vibrations in the interlayer water and Si-O vibrations in the layers of the montmorillonite. The bending frequency, v 2, decreases as the hydrogen bonds of water become weaker (Greinacher et al 1955;Pimentel and McClellan 1960;Falk 1984;Grodzicki and Piszczek 1994). Consequently, from the Figures 6a and 6b, we conclude that the hydrogen bonds of the interlayer water become weaker as mJrn c decreases.…”

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confidence: 99%

Swelling Pressure of Montmorillonite Layers Versus H-O-H Bending Frequency of the Interlayer Water

Yan

1996

Clays and clay miner.

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Abstract--The in-depth perturbation of vicinal water by the surfaces of montmorillonite layers was investigated by relating the swelling pressure, II, of the montmorillonite layers to the H-O-H bending frequency, v 2, of the interlayer water. For this purpose, an oriented montmorillonite gel was deposited on a porous filter in an environmental chamber. On its underside the filter was in contact with a solution maintained at atmospheric pressure. By admitting nitrogen gas at a known pressure to the environmental chamber, water was squeezed from the gel into the solution until equilibrium was reached and H equalled the applied pressure. Then the gel was divided into 2 parts. One part was used for the gravimetric determination of the water content, mJm C. It was possible, therefore, to determine mJm C as a function of II. The other part of the sample was transferred to an FTIR spectrometer where the v 2 of the water within it was measured by attenuated total reflectance. Thus, the same samples were used to determine the dependence of both 11 and v2 on mJm C. It was found that H and v2 were both exponential functions of mJm w and so a linear relation was found between ln(H + 1) and ln(v2/v2~ where v2 ~ is the H-O-H bending frequency of bulk water. These results strongly support the conclusion that the in-depth perturbation of the water by the surfaces of the montmorillonite layers is primarily responsible for both the development of H and the departure of vz from v2 ~

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“…Variscite absorption bands at ~1600 and 1574 cm -1 are located in the water deformation region, and their presence was interpreted by Salvador & Fayos (1972) as indicating the existence of two different types of water molecules. The nature of the two water molecules in variscite has always been of special interest to scientists (Kniep et al, 1977;Falk, 1984). However, in our variscite sample the DTA and TG curves do not show a two-step water loss so that this assumption is not substantiated.…”

Section: Infrared Absorption Spectrummentioning

confidence: 50%

Untitled

2004

Studia UBB Geologia

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ABSTRACT. Recent investigations on a phosphatized sediment sequence in the Cioclovina Cave led to the identification of a second occurrence in Romania (first time in the cave environment) of variscite, AlPO 4 ·2H 2 O. The mineral exists as dullwhite, tiny crusts and veinlets within the thick argillaceous material accumulated on the cave floor. Under scanning electron microscope (SEM) variscite appears as subhedral to euhedral micron-size crystals. The {111} pseudo-octahedral form is rather common. Variscite was further characterized by means of X-ray diffraction, thermal, vibrational FT-IR and FT-Raman spectroscopy, and by SEM energydispersive spectrometry (EDS). The calculated orthorhombic cell parameters are a = 9.823(4), b = 8.562(9), c = 9.620(5) Å, and V = 809.167(6) Å 3 . The ED spectrum of variscite shows well-resolved Al and P lines confirming thus the presence of the major elements in our compound. The formation of variscite is attributed to the reaction between the phosphate-rich leachates derived from guano and the underlying clay sediments.Keywords: phosphate minerals, variscite, Cioclovina Cave, Romania. GENERAL DATAThe Cioclovina Cave is located 40 km southeast of the city of Hunedoara, in the west-southwest side of Şureanu Mountains, Romania (Fig. 1, inset), at an altitude of 770 m asl. The investigated part of the cave develops in reef limestone of Lower Cretaceous age (Stilla, 1981;Pop et al., 1985). The total length of the cave is 1400 m (Breban et al., 2003), but only the first 450 m (Fig. 1) are of great interest with respect to the occurrence of authigenic phosphate minerals.Mining operations undertaken in this cave during the first half of the 20 th century have exposed impressive outcrops of interstratified alluvial sediments (clay, sand, and gravels) that were subsequently phosphatized through the action of P-rich solutions provided by the breakdown of guano and bones. Depending on whether the percolating water passing through guano reacts with carbonate rocks or clay minerals, Ca-, Mg-, and Al-rich, or K-Fe phosphates have been deposited. Over the last five years, several descriptive and/or detailed mineralogical investigations were undertaken, each of them pointing out a remarkable rich and divers assemblage of authigenic phosphate minerals. So far, 15 phosphate minerals were described by Schadler

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The frequency of the HOH bending fundamental in solids and liquids

Cited by 198 publications

References 28 publications

Low Bending Vibrations of Crystalline Water Molecules: An Ongoing Quest or a Final Word – Topical Review – A Tribute to Academician Bojan Šoptrajanov

Low Bending Vibrations of Crystalline Water Molecules: An Ongoing Quest or a Final Word – Topical Review – A Tribute to Academician Bojan Šoptrajanov

Swelling Pressure of Montmorillonite Layers Versus H-O-H Bending Frequency of the Interlayer Water

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