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NMR study of n-dodecane adsorbed on graphite
M D Alba1, M A Castro, S M Clarke
1Instituto de Ciencia de Materiales de Sevilla, Quimica Inorganica, Avenida Américo Vespucio, 41092-, Sevilla, Spain
Solid State Nuclear Magnetic Resonance
|May 24, 2003
Summary
Nuclear Magnetic Resonance (NMR) spectroscopy effectively probes liquid adsorption on solids. This method reveals solid adsorbed layers coexisting with bulk material, applicable to multicomponent mixtures.
Area of Science:
- Surface Science
- Physical Chemistry
- Spectroscopy
Background:
- Investigating the solid-liquid interface is crucial for understanding adsorption phenomena.
- Traditional methods like calorimetry and neutron scattering provide valuable insights but may lack detailed molecular-level information.
- Nuclear Magnetic Resonance (NMR) spectroscopy offers a potential avenue for detailed interfacial studies.
Purpose of the Study:
- To demonstrate the efficacy of 1H and 2H NMR spectroscopy for studying liquid adsorption at the solid-liquid interface.
- To investigate the adsorption of n-dodecane on graphite at monolayer coverages.
- To validate NMR findings against existing experimental data.
Main Methods:
- Utilizing static single-pulse proton (1H) NMR spectroscopy.
- Employing static quadrupolar echo deuterium (2H) NMR spectroscopy.
- Analyzing spectra for n-dodecane adsorbed on graphite at 1 and 5 monolayers.
Main Results:
- NMR spectra exhibited features consistent with calorimetric and neutron scattering data.
- Evidence for the formation of solid adsorbed layers coexisting with bulk adsorbate was observed for both isotopes.
- The simultaneous probing of deuterated and protonated materials was achieved.
Conclusions:
- 1H and 2H NMR spectroscopy is a powerful tool for investigating adsorption at the solid-liquid interface.
- The experimental approach confirms the coexistence of adsorbed and bulk phases.
- This NMR technique is readily extendable to study complex multicomponent mixtures.