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Water Structure and Dynamics in Smectites: X-ray Diffraction and 2H NMR Spectroscopy of Mg–, Ca–, Sr–, Na–, Cs–, and Pb–Hectorite

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [1];  [3];  [4];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Alfred Univ., NY (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Michigan State Univ., East Lansing, MI (United States); Univ. College London (United Kingdom)

Variable-temperature X-ray diffraction and 2H NMR spectroscopy of the smectite mineral, hectorite, containing interlayer Na+, K+, Cs+, Mg2+, Ca2+, Sr2+, and Pb2+ equilibrated at 43% relative humidity (RH) and mixed with 2H2O to form a paste provide a comprehensive picture of the structural environments and dynamics of interlayer 2H2O and the relationships of these properties to interlayer hydration state, the hydration energy and polarizability of the cation, temperature, and the formation of ice-1h in the interparticle pores. The variation in basal spacing shown by the XRD data correlates well with the 2H NMR behavior, and the XRD data show for the first time in hectorites that crystallization of interparticle ice-1h causes a decrease in the interlayer spacing, likely due to removal of interlayer 2H2O. Here, the variation of the 2H NMR behavior of all the samples with decreasing temperature reflects decreasing frequencies of motion for the rotation of the 2H2O molecules around their dipoles, reorientation of the 2H2O molecules, and exchange of the 2H2O molecules between interlayer sites coordinated to and not coordinated to the cations.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
DOE Contract Number:
AC05-76RL01830; FG02-08ER15929
OSTI ID:
1327128
Report Number(s):
PNNL-SA--119096; 48812; KP1704020
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 16 Vol. 120; ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

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