<sup>129</sup>Xe NMR Studies of Pecan Shell-Based Biochar and Structure-Process Correlations

Mauri, Michele; Farina, Matteo; Patriarca, Giorgio; Simonutti, Roberto; Klasson, K. Thomas; Cheng, H. N.

doi:10.1080/1023666x.2015.979038

Cited by 4 publications

(2 citation statements)

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“…These processes deeply change the structure of the starting materials, creating extended porous structures which are responsible for the emerging properties. The porous structures of a series of pecan shell-based biochar were analyzed with 129 Xe NMR by Simonutti and co-workers [124]. The spectrum of untreated pecan shells only showed the free gas peak close to 0 ppm, indicating the absence of pores in which confined xenon could be distinguished from the free gas.…”

Section: Porous Carbon Materialsmentioning

confidence: 99%

129Xe: A Wide-Ranging NMR Probe for Multiscale Structures

2022

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Porous materials are ubiquitous systems with a large variety of applications from catalysis to polymer science, from soil to life science, from separation to building materials. Many relevant systems of biological or synthetic origin exhibit a hierarchy, defined as spatial organization over several length scales. Their characterization is often elusive, since many techniques can only be employed to probe a single length scale, like the nanometric or the micrometric levels. Moreover, some multiscale systems lack tridimensional order, further reducing the possibilities of investigation. 129Xe nuclear magnetic resonance (NMR) provides a unique and comprehensive description of multiscale porous materials by exploiting the adsorption and diffusion of xenon atoms. NMR parameters like chemical shift, relaxation times, and diffusion coefficient allow the probing of structures from a few angstroms to microns at the same time. Xenon can evaluate the size and shape of a variety of accessible volumes such as pores, layers, and tunnels, and the chemical nature of their surface. The dynamic nature of the probe provides a simultaneous exploration of different scales, informing on complex features such as the relative accessibility of different populations of pores. In this review, the basic principles of this technique will be presented along with some selected applications, focusing on its ability to characterize multiscale materials.

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Section: Porous Carbon Materialsmentioning

confidence: 99%

129Xe: A Wide-Ranging NMR Probe for Multiscale Structures

2022

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“…In this view, the NMR spectroscopy of noble gases, 19,20 especially xenon, with its ability to probe the matter on the nanoscale in a non-destructive way can give highly detailed information about the complex nanostructure of these neoteric materials. 129 Xe NMR has been traditionally applied to characterize the structure of widely different porous systems such as zeolites, 21,22 mesoporous silica, and silica-based materials, [23][24][25] porous carbonbased materials, [26][27][28][29] polymers, [30][31][32] and metal-organic frameworks. 33,34 However 129 Xe has also been used as an inert NMR probe to characterize the structure of isotropic and anisotropic liquids.…”

Section: Introductionmentioning

confidence: 99%