Nuclear-Magnetic-Resonance Measurements Reveal the Origin of the Debye Process in Monohydroxy Alcohols
Измерения методом ядерного магнитного резонанса выявляют происхождение дебаевского процесса в моноатомных спиртах
2010-12-16
SCID: 54.1/v4vek3p5
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Debye processHydrogen-bonded glass-forming liquidsMonohydroxy alcoholsNuclear magnetic resonanceSpin-lattice relaxation
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Abstract (AI)
Monohydroxy alcohols show a structural relaxation and at longer time scales a Debye-type dielectric peak. From spin-lattice relaxation experiments using different nuclear probes, an intermediate, slower-than-structural dynamics is identified for n-butanol. Based on these findings and on translational diffusion measurements, a model of self-restructuring, transient chains is proposed. The model is demonstrated to explain consistently the so-far puzzling observations made for this class of hydrogen-bonded glass forming liquids.
Key Findings
1
Spin-lattice relaxation experiments with different nuclear probes identify an intermediate dynamics in n-butanol that is slower than structural relaxation.
2
The proposed model consistently accounts for previously puzzling observations in hydrogen-bonded glass-forming monohydroxy alcohols.
3
The self-restructuring transient-chain model explains the long-time Debye-type dielectric peak in monohydroxy alcohols.
4
Translational diffusion measurements, combined with nuclear-magnetic-resonance results, support a model of transient chains that continually self-restructure.
Research Object
Hydrogen-bonded monohydroxy alcohol glass-forming liquids, specifically n-butanol
Research Subject
the intermediate slower-than-structural dynamics and its relationship to the Debye-type dielectric relaxation, interpreted through transient self-restructuring chains
Publication Details
Publication Date
2010-12-16
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