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Vyalikh, A. ; Wang, De-Yi ; Wagenknecht, U. ; Heinrich, G. ; Scheler, U.
Molecular dynamics in aluminum layered double hydroxides as studied by 1H T1p NMR measurements

Proton dynamics in pristine and organically-modified layered double hydroxide has been studied by 1H T1?. Inverse Laplace transform with spectral resolution results in a correlation of T1? and chemical shift.

In LDH two contributions are resolved. They are assigned to the metal hydroxides, forming the LDH sheets (4–8 ms), and mobile interlayer water (2 ms). Apparent T1? values of OH-protons in surfactant-modified LDH are different in dodecylbenzenesulfonate- (SDBS) and sodium octasulfonate- (C8) modified LDH. This difference is explained by the presence of water in LDH–SDBS. The effects of spin diffusion have been studied by performing 2D 1H RFDR in the LDH–SDBS.

* Combination of proton relaxation time measurements with chemical shift resolution permits assignment to structural motifs.
* Inverse Laplace transform is applied for data analysis.
* A significant difference of the mobility between water and OH groups is found. · Mobility varies with the cation distribution.

Quelle
Chemical Physics Letters 509

Seiten
138-142

DOI
http://dx.doi.org/10.1016/j.cplett.2011.04.078

Erschienen am
June 2011
 
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