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Consuelo-Leal, A.; Araujo-Ferreira, A. G.; Lucas-Oliveira, Éverton; Bonagamba, Tito José; Auccaise, R.

doi:10.1016/j.jmr.2023.107403

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…In the latter case, one should keep in mind that 133 Cs is a spin-7/2 nucleus, whereas 7 Li is a spin-3/2 nucleus. Despite its lowest e Q (−0.343 vs −4.01 fm 2 for 7 Li), 133 Cs undergo the most complex relaxation processes, involving seven transitions (one central and six satellites) against only three for the other nuclei. − …”

Section: Resultsmentioning

confidence: 98%

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH₄⁺, NO₃^–, Li⁺, Na⁺, Rb⁺, Cs⁺, Br^–) on Anatase Titanium Dioxide in Aqueous Media by NMR

Tan,

Pagnoux,

Sarou-Kanian

et al. 2023

J. Phys. Chem. C

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The adsorption of small ions on the surface of inorganic material has been studied extensively through the lens of nuclear magnetic resonance relaxation enhancements. In mixtures of a commercial titanium dioxide (TiO2) powder with various aqueous electrolytes based on ammonium nitrate (NH4NO3) and alkali (Li, Na, Rb, Cs) bromide, the adsorption of Li+, Na+, Rb+, Cs+, Br–, NH4 +, and NO3 – onto TiO2 was investigated with 14N, 15N, 7Li, 23Na, 87Rb, and 133Cs and 81Br NMR π/2 single-pulse spectra and longitudinal relaxation curves analysis (T 1). In the TiO2/NH4NO3 slurry, the preferential adsorption of NH4 + ions on titania was reflected in the broadening of their 14N peak and the increase of the longitudinal relaxation rates of both 14NH4 + and 15NH4 +, with a more significant effect for 14N (undergoing surface-induced quadrupolar relaxation, SIQR) than 15N (experiencing dipolar relaxation). To probe alkali ion adsorption on TiO2, single π/2 pulse NMR spectra were first recorded on slurries containing a single alkali ion. Fractions of adsorbed ions and the corresponding density per unit area were derived from the signal losses for 23Na+ and 87Rb+. The latter approach was limited to 7Li+ and 133Cs+, for which no signal loss was recorded, although SIQR was observed for all ions. To compare the alkali adsorption properties, simultaneous exposures of TiO2 surfaces to pairs of cations allowed SIQR to be measured and surface affinities to be ranked in the following order Cs+ > Rb+ > Na+ > Li+, which is strongly correlated to the water structure-breaking properties of both TiO2 and ions.

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Section: Resultsmentioning

confidence: 98%

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH₄⁺, NO₃^–, Li⁺, Na⁺, Rb⁺, Cs⁺, Br^–) on Anatase Titanium Dioxide in Aqueous Media by NMR

Tan,

Pagnoux,

Sarou-Kanian

et al. 2023

J. Phys. Chem. C

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Relaxation dynamics of an unlike spin pair system

Consuelo-Leal,

Sare,

Auccaise

2023

Quantum Inf Process

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Nuclear spin relaxation

Tayler

2024

Nuclear Magnetic Resonance

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This chapter explores current theoretical and experimental trends in nuclear spin relaxation, providing a digest of around 100 research papers published between 2022 and mid 2023. As is customary, this deliberately excludes the latest literature to capture trends and insights that have developed after publication. Throughout, emphasis is placed on a few topics: (1) relaxation in systems that exhibit enhanced nuclear spin polarization, through techniques like dynamic nuclear polarization and parahydrogen-induced polarization that have revolutionized signal-to-noise ratios in NMR and MRI; (2) relaxation in liquids at low and ultralow magnetic fields, where interest is drawn towards new mechanisms and applications in biomolecular systems; (3) long-lived spin states, a relaxation methodology that is complementary to the usual T1 and T2 approaches, which always seems to be applied in molecules with increasing complexity and relevance to biochemistry. Conventional study areas are also reviewed, grouped by phase of matter (solid, liquid, gas, mixtures) and technique (theory/modeling, experiment: solvent-relaxation, co-solute relaxation, relaxation-dispersion mapping, and fast-field cycling).

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NMR Relaxation by Redfield equation in a spin system I=7/2

Cited by 4 publications

References 35 publications

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH₄⁺, NO₃^–, Li⁺, Na⁺, Rb⁺, Cs⁺, Br^–) on Anatase Titanium Dioxide in Aqueous Media by NMR

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH₄⁺, NO₃^–, Li⁺, Na⁺, Rb⁺, Cs⁺, Br^–) on Anatase Titanium Dioxide in Aqueous Media by NMR

Relaxation dynamics of an unlike spin pair system

Nuclear spin relaxation

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NMR Relaxation by Redfield equation in a spin system I=7/2

Cited by 4 publications

References 35 publications

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH4+, NO3–, Li+, Na+, Rb+, Cs+, Br–) on Anatase Titanium Dioxide in Aqueous Media by NMR

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH4+, NO3–, Li+, Na+, Rb+, Cs+, Br–) on Anatase Titanium Dioxide in Aqueous Media by NMR

Relaxation dynamics of an unlike spin pair system

Nuclear spin relaxation

Contact Info

Product

Resources

About

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH₄⁺, NO₃^–, Li⁺, Na⁺, Rb⁺, Cs⁺, Br^–) on Anatase Titanium Dioxide in Aqueous Media by NMR

Surface-Induced Quadrupolar Relaxation (SIQR): Probing Adsorption of Monovalent Ions (NH₄⁺, NO₃^–, Li⁺, Na⁺, Rb⁺, Cs⁺, Br^–) on Anatase Titanium Dioxide in Aqueous Media by NMR