Translational dynamics of water in a nanoporous layered silicate

Journal Article · Tue Mar 01 00:00:00 EST 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.71.104301· OSTI ID:20666238

Nair, Sankar; Chowdhuri, Zema; Peral, Inmaculada; Neumann, Dan A; Dickinson, L Charles; Tompsett, Geoffrey; Jeong, Hae-Kwon; Tsapatsis, Michael ^[1]

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1. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100 (United States)

Neutron time-of-flight and backscattering spectroscopy have been used to study the translational diffusion of water molecules in the unusual layered material AMH-3, which consists of (zeolitelike) three-dimensionally nanoporous silicate layers spaced by (claylike) interlayer regions. The synthesis of AMH-3 and its characterization by {sup 29}Si NMR, Raman, and infrared spectroscopy, are described. An analysis of quasielastic neutron scattering (QENS) spectra using the random jump diffusion model reveals two translational diffusive motions clearly separated in time scales: a fast process (D{approx}10{sup -9} m{sup 2}/s at 300 K), and a much slower process (D{approx}10{sup -11} m{sup 2}/s at 300 K). Considering the structural model of AMH-3 and the transport properties extracted from the QENS data, it is suggested that the slower motion corresponds to diffusion by water molecules in the interlayer spaces whereas the fast process involves diffusion in the silicate layer. This first investigation of transport phenomena in nanoporous layered silicates like AMH-3 indicates that they have the potential to offer mass transport properties different from zeolite materials and layered clays.

• OSTI ID: 20666238
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 71, Issue 10; Other Information: DOI: 10.1103/PhysRevB.71.104301; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
BACKSCATTERING
CLAYS
DIFFUSION
INFRARED SPECTRA
LAYERS
NEUTRONS
NUCLEAR MAGNETIC RESONANCE
QUASI-ELASTIC SCATTERING
RAMAN SPECTRA
SILICATES
SILICON 29
STRUCTURAL MODELS
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
THREE-DIMENSIONAL CALCULATIONS
TIME-OF-FLIGHT METHOD
WATER
ZEOLITES