On the use of NMR distance measurements for assessing surface site homogeneity

Perras, Frédéric A.; Culver, Damien B.

doi:10.1039/d3dt03201a

Cited by 1 publication

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“…We were unable to resolve the fine details of these structures in large part due to the inability of the REDOR-based method to resolve similar structural conformers. Recent work has suggested that REDOR-based methods may simply reveal average structures in disordered systems and miss some of the finer structural details …”

Section: Resultsmentioning

confidence: 99%

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Probing Interactions between Adsorbed Polymers and γ-Al₂O₃ Using Solid-State NMR

Zhao,

Perras

2024

J. Phys. Chem. C

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The interactions between polymers and metal oxide surfaces affect the physical properties of polymer composites and the selectivity of catalysts used for plastic conversion. Gauging the strengths of these interactions and how they depend on adsorption conformations and polymer structure is nevertheless quite challenging. Herein, we evaluate whether a recently introduced dynamic nuclear polarization-based surface-to-atom distance measurement method can be used to gauge the specific interactions between five vinyl polymers and an oxide support (alumina). The adsorption conformations of polymer monolayers were studied using site-specific 13 C{ 27 Al} rotational-echo saturation-pulse double-resonance (RESPDOR) experiments. The method is effective in revealing the average distance between the adsorbed polymer and the surface, as well as the fraction of the monomers that are adsorbed. Polymers that possess larger side chains are more weakly adsorbed, as evidenced by their formation of more numerous loop and tail structures. The measured RESPDOR dephasing data further reveals that polymer adsorption conformations are largely disordered and involve few hydrogen bonding interactions.

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Section: Resultsmentioning

confidence: 99%

“…Recent work has suggested that REDOR-based methods may simply reveal average structures in disordered systems and miss some of the finer structural details. 71…”

mentioning

confidence: 99%

Probing Interactions between Adsorbed Polymers and γ-Al₂O₃ Using Solid-State NMR

Zhao,

Perras

2024

J. Phys. Chem. C

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On the use of NMR distance measurements for assessing surface site homogeneity

Abstract: The past decades have seen tremendous growth in the area of single-site heterogeneous catalysis which aims to marry the best aspects of homogeneous and heterogeneous catalysis, namely molecular-level site control...

Cited by 1 publication

References 54 publications

Probing Interactions between Adsorbed Polymers and γ-Al₂O₃ Using Solid-State NMR

Probing Interactions between Adsorbed Polymers and γ-Al₂O₃ Using Solid-State NMR

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On the use of NMR distance measurements for assessing surface site homogeneity

Abstract: The past decades have seen tremendous growth in the area of single-site heterogeneous catalysis which aims to marry the best aspects of homogeneous and heterogeneous catalysis, namely molecular-level site control...

Cited by 1 publication

References 54 publications

Probing Interactions between Adsorbed Polymers and γ-Al2O3 Using Solid-State NMR

Probing Interactions between Adsorbed Polymers and γ-Al2O3 Using Solid-State NMR

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Probing Interactions between Adsorbed Polymers and γ-Al₂O₃ Using Solid-State NMR

Probing Interactions between Adsorbed Polymers and γ-Al₂O₃ Using Solid-State NMR