Electron spin resonance and nuclear magnetic relaxation dispersion studies of commercial clay minerals and zeolites

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1993.1168· OSTI ID:6784185

Sur, S K; Heinsbergen, J F; Bryant, R G ^[1]; Listinsky, J J ^[2]

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1. Univ. of Rochester, NY (United States)
2. Univ. of Alabama, Birmingham (United States)

Nuclear magnetic relaxation dispersion measurements on water protons and EPR spectra are reported for a series of clays and zeolite samples. The paramagnetic components of the samples make strong contributions to the proton spin-lattice relaxation rates at low magnetic field strengths, although the shape of the magnetic relaxation dispersion profile is not accurately fitted by standard relaxation models. For the iron-rich clay minerals, the water-proton spin-lattice relaxation rate is approximately a linear function of the log of the magnetic field strength. The zeolite relaxation profiles are different and may be approximately modeled with a function of the form rate = A[nu][sup [minus]B], where B ranges from 0.16 to 0.43. The EPR spectra of the clays and zeolites demonstrate significant contributions from iron(III) and manganese(II). The manganese(II) spectra are complicated by zero-field interactions that in some cases add a number of additional transitions to the spectra.

• OSTI ID: 6784185
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 157:1; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CLAYS
ELECTRON SPIN RESONANCE
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON
MAGNETIC RESONANCE
MANGANESE
MATERIALS
METALS
MINERALS
NUCLEAR MAGNETIC RESONANCE
OXYGEN COMPOUNDS
RELAXATION
RESONANCE
SILICATE MINERALS
SPIN-LATTICE RELAXATION
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENTS
WATER
ZEOLITES