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Structural and dynamical properties of guest molecules confined in mesoporous silica materials revealed by NMR

Buntkowsky, G. and Breitzke, H. and Adamczyk, A. and Roelofs, F. and Emmler, T. and Gedat, E. and Grünberg, B. and Xu, Y. P. and Limbach, H. H. and Shenderovich, I. and Vyalikh, A. and Findenegg, G. (2007):
Structural and dynamical properties of guest molecules confined in mesoporous silica materials revealed by NMR.
In: Physical Chemistry Chemical Physics, pp. 4843-4853, 9, (35), [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

in the last fifteen years several novel porous silica materials, which are periodically structured on the mesoscopic length scale, have been synthesized. They are of broad interest for fundamental studies of surface-substrate interactions, for studies of the dynamics of guest molecules in confinement and for studies of the effect of confinement on the structural and thermophysical properties of fluids. Examples of such confinement effects include the change of the freezing and melting points or glass transitions of the confined liquids. These effects are studied by combinations of several NMR techniques, such as (15)N- and (2)H-solid-state NMR line shape analysis, MAS NMR and NMR diffusometry with physico-chemical characterization techniques such as nitrogen adsorption and small angle diffraction of neutrons or X-rays. This combination does not require crystalline samples or special clean and well defined surfaces such as conventional surface science techniques, but can work with typical ill-defined real world systems. The review discusses, after a short introduction, the salient features of these materials and the applied NMR experiments to give the reader a basic knowledge of the systems and the experiments. The rest of the review then focuses on the structural and dynamical properties of guest molecules confined in the mesoporous silica. It is shown that the confinement into the pores leads to fascinating new features of the guests, which are often not known for their bulk phases. These features depend strongly on the interplay of the their interactions with the silica surface and their mutual interactions.

Item Type: Article
Erschienen: 2007
Creators: Buntkowsky, G. and Breitzke, H. and Adamczyk, A. and Roelofs, F. and Emmler, T. and Gedat, E. and Grünberg, B. and Xu, Y. P. and Limbach, H. H. and Shenderovich, I. and Vyalikh, A. and Findenegg, G.
Title: Structural and dynamical properties of guest molecules confined in mesoporous silica materials revealed by NMR
Language: English
Abstract:

in the last fifteen years several novel porous silica materials, which are periodically structured on the mesoscopic length scale, have been synthesized. They are of broad interest for fundamental studies of surface-substrate interactions, for studies of the dynamics of guest molecules in confinement and for studies of the effect of confinement on the structural and thermophysical properties of fluids. Examples of such confinement effects include the change of the freezing and melting points or glass transitions of the confined liquids. These effects are studied by combinations of several NMR techniques, such as (15)N- and (2)H-solid-state NMR line shape analysis, MAS NMR and NMR diffusometry with physico-chemical characterization techniques such as nitrogen adsorption and small angle diffraction of neutrons or X-rays. This combination does not require crystalline samples or special clean and well defined surfaces such as conventional surface science techniques, but can work with typical ill-defined real world systems. The review discusses, after a short introduction, the salient features of these materials and the applied NMR experiments to give the reader a basic knowledge of the systems and the experiments. The rest of the review then focuses on the structural and dynamical properties of guest molecules confined in the mesoporous silica. It is shown that the confinement into the pores leads to fascinating new features of the guests, which are often not known for their bulk phases. These features depend strongly on the interplay of the their interactions with the silica surface and their mutual interactions.

Journal or Publication Title: Physical Chemistry Chemical Physics
Volume: 9
Number: 35
Uncontrolled Keywords: solid-state nmr nuclear-magnetic-resonance heterogeneous nucleophilic catalyst pore structure characterization anomalous segment diffusion anisotropic self-diffusion field gradient nmr x-ray-diffraction porous silica water-molecules
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 27 Oct 2014 20:37
Official URL: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
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212HZ Times Cited:68 Cited References Count:118

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