Infrared Reflectance Study of Thermally Treated Li- and Cs-Montmorillonites

Karakassides, Michael A.

doi:10.1346/ccmn.1997.0450504

Cited by 36 publications

(26 citation statements)

References 32 publications

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“…PAS is a nondestructive technique useful for handling clays but is limited by the number of samples that may be handled in a given period of time. Specular reflectance is not readily applicable to clay minerals, as the technique normally applies to flat, shiny polished surfaces, although specular IR reflectance studies have been used to study thermally treated Li and Cs montmorillonites (Karakassides et al 1997). DRIFT is more applicable to powders but is limited to some extent by the Restrahlen effects where the particle size and the t Permanent address: Department of Chemical and Metallurgical Engineering, Division of Inorganic Chemistry, Lule~ University of Technology, SE-971 87 LulegL Sweden.…”

Section: Introductionmentioning

confidence: 99%

Combination Bands in the Infrared Spectroscopy of Kaolins—A Drift Spectroscopic Study

Frost

Johansson

1998

Clays and clay miner.

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Abstraet--Kaolinites with varying degrees of defect structures have been studied by both mid-infrared (IR) and near-IR diffuse reflectance spectroscopy (DRIFT). Difference bands were observed in the 2650-to 2750-cm I region. This region coincides with the kaolinite-deuterated hydroxyl stretching region. Summation bands were observed in the near-IR spectra in the 4500-to 4650-cm -~ and in the 7050-to 7250-cm t region. Each of the spectral regions of the summation and difference bands is both kaolin polytype and sample dependent. It is proposed that each of these sets of bands arises from the combination of the hydroxyl stretching frequencies and the hydroxyl deformation frequencies and, to a lesser extent, the silicon-oxygen symmetric stretching vibration of the siloxane layer. Additional difference bands of very low intensity were also observed at 2930 and 2856 cm i. Combination bands were observed in all kaolinites at 2137 and 2227 cm-L Each of the 3 major combination spectral regions was composed of 5 component bands corresponding to the 4 IR active and the 1 Raman active kaolinite hydroxyl stretching frequencies. Combination bands were also observed at --1932 and 1821 cm-L

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Section: Introductionmentioning

confidence: 99%

Combination Bands in the Infrared Spectroscopy of Kaolins—A Drift Spectroscopic Study

Frost

Johansson

1998

Clays and clay miner.

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“…However, this is not the case. One needs to account for the fact that both transverse optical (TO) and longitudinal optical (LO) excitations are associated with each resonance term in the dielectric function that can be observed in the IR spectra [16,25,26]. When the IR radiation is normal to the sample surface, only TO vibrations are detected due to the transverse character of the electromagnetic radiation.…”

Section: Resultsmentioning

confidence: 99%

Infrared Spectroscopic Analysis of Sub-Monolayer Perfluoropolyether Films Based on the ^|^mdash;[(CF2)nO]^|^ndash; Monomer Unit for n = 2, 3 and 4

Waltman

2014

Tribology Online

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Infrared specular reflection spectra of the TA-30, D-4OH and C4-4OH perfluoropolyether liquid films on gold substrates are simulated and studied experimentally. The simulated spectra were obtained using a classical dispersion analysis coupled with solutions of Maxwell's equations for transmission and reflection of electromagnetic radiation. The simulated spectra, which are based on a randomly oriented sample, provide excellent fits for the perfluoropolyethers over a wide film thickness range. Spectroscopic data are provided for TA-30, D-4OH and C4-4OH. The differences in the transverse and longitudinal optical IR spectra are discussed for off-normal reflection spectra in the thin film limit. Corrections to the IR reflection spectra for sub-monolayer coverage using effective medium theory are also discussed.

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“…The following PVOH -starch blending ratio were considered: 50 / 50; 40 / 60; 30 / 70. The assignment of the FTIR peaks were done considering: [14] PVOH, [15 -26] for starch, [27,28,29] for Nanocor I 28, and [30] for glycerol, urea and DEG.…”

Section: Methodsmentioning

confidence: 99%

The miscibility estimation of some nanocomposites based on starch

et al. 2011

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Based on the FTIR spectral changes, the miscibility of some nanocomposites based on starch, polyvinyl alcohol and treated multilayered silicate, was qualitatively estimated. The FTIR spectroscopy provide evident gross/small spectral changes as well as appreciable spectral shifts mainly in those spectral range that defines hydroxyl O-H vibrations (3600-3000 cm -1 ), water absorbtion (1800 -1500 cm -1 ) , the morphological order degree and the interaction with multilayered silicate and (1192 -950 cm -1 ). Based on the observed spectral modifications it can be estimate that high miscibility do exist between the components of the studied nanocomposites.

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Infrared Reflectance Study of Thermally Treated Li- and Cs-Montmorillonites

Cited by 36 publications

References 32 publications

Combination Bands in the Infrared Spectroscopy of Kaolins—A Drift Spectroscopic Study

Combination Bands in the Infrared Spectroscopy of Kaolins—A Drift Spectroscopic Study

Infrared Spectroscopic Analysis of Sub-Monolayer Perfluoropolyether Films Based on the ^|^mdash;[(CF2)nO]^|^ndash; Monomer Unit for n = 2, 3 and 4

The miscibility estimation of some nanocomposites based on starch

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