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• W2022600504 abstract "Abstract A new environmental cell allowing for the independent synchronous collection of the near- and mid-infrared spectra (12,000–600 cm −1 ) in the diffuse reflection and attenuated total reflection (ATR) modes, respectively, is reported. The cell is employed to study in real time the dehydration of the phyllosilicate mineral sepiolite, Mg 8 Si 12 O 30 (OH) 4 (OH 2 ) 4 · w H 2 O, in both its natural form and after in situ deuteration at ambient. The spectra are obtained under dynamic purging with dry N 2 and compared to those of the same material conditioned over saturated salt solutions. Sepiolite is an important industrial mineral with a modulated structure of alternating tunnels and ribbons. Its mild drying is associated with pronounced vibrational spectral changes due to the removal of surface and zeolitic H 2 O and the concomitant structural relaxation of the ribbons. Detailed assignments are provided for the fundamental, combination and overtone spectrum of H 2 O confined in the tunnels of sepiolite, SiOH groups on the external surface of the particles, and Mg 3 OH groups in the 2:1 ribbons. The spectra are discussed in comparison to those of palygorskite (modulated phyllosilicate with narrower ribbons and tunnels), talc (trioctahedral magnesian phyllosilicate without modulation) and high-surface area silica. It is demonstrated that sepiolite exhibits three discrete states of zeolitic hydration at ambient temperature: Besides the previously known hydrated ( w  = 7–8) and dry ( w  = 0–1) states which dominate the spectra above 30% and below 3% relative humidity, respectively, a hitherto unknown intermediate ( w  = 4–5) is found in the 3–10% range. The new state is most conveniently identified in the near-infrared by a ν 02 Mg 3 O-H stretching mode at 7205 cm −1 ( ν 01  = 3686 cm −1 , X  = 83.5 cm −1 ) and a characteristic H 2 O combination band at 5271 cm −1 (D 2 O: 3908 cm −1 )." @default.
• W2022600504 created "2016-06-24" @default.
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• W2022600504 date "2013-09-01" @default.
• W2022600504 modified "2023-10-17" @default.
• W2022600504 title "Synchronous ATR infrared and NIR-spectroscopy investigation of sepiolite upon drying" @default.
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• W2022600504 doi "https://doi.org/10.1016/j.vibspec.2013.05.009" @default.
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