Publication
Reference
Kuligiewicz A., Derkowski A., Emmerich K., Christidis G., Tsiantos K., Gionis V., Chryssikos G.~D. (2015). Revisiting the Infrared Spectrum of the Water-Smectite Interface]. Clay clay Miner., 63, 443 - 456.
Names
  • A. Kuligiewicz
  • A. Derkowski
  • K. Emmerich
  • G. Christidis
  • K. Tsiantos
  • V. Gionis
  • G.~D. Chryssikos
Article and keywords
Title
Revisiting the Infrared Spectrum of the Water-Smectite Interface]
Abstract
Layer charge (LC) is a fundamental property of smectite but its measurement remains challenging and tedious to apply on a high-throughput basis. The present study demonstrates that the position of a sharp, high-energy O-D stretching band of adsorbed D2O (nO-D, at ~2686-2700 cm-1), determined by infrared spectroscopy, correlates with LC and provides a simple method for its measurement. Twenty nine natural dioctahedral smectites and 14 reduced-charge montmorillonites with LC determined previously by different methodologies were saturated with D2O and examined by attenuated total reflectance infrared spectroscopy (ATR-IR). The samples included smectites in Mg, Ca, Na, Li, K, and Cs forms and covered the full range of the smectite LC (0.2 to 0.6 e per formula unit). Statistically significant correlations were found between nO-D and LC values determined with each of the two main methods of LC determination: the structural formula method (R2 = 0.96, s = 0.02, ~0.2 < LC <0.6) and the alkylammonium method (R2 = 0.92, s = 0.01, 0.27 < LC < 0.37). These correlations were based on Li- and Na-saturated smectites, respectively, but other cationic forms can be employed provided that the exchangeable cations are of sufficiently high hydration enthalpy (e.g. Mg2+ or Ca2+, but not K+ or Cs+). The new method is fast, low-cost, implemented easily in laboratories equipped with ATR-FTIR, and applicable to samples as small as ~5 mg.
Keywords
sample, spectroscopy
Content
instrument-technique, sample, spectral data, spectral data use, earth sciences, materials sciences
Year
2015
Journal
Clays and Clay Minerals
Volume
63
Pages
443 - 456
Pages number
15
Document type
article
Publication state
published
Doi
10.1346/CCMN.2015.0630603
Identifiers
Publications