Novel zero-length column analysis of desorption curves for single cylindrical pellets

Quantifying molecular surface barriers and intracrystalline diffusion in nanoporous materials by zero‐length column

“…33 Note that the zero-length column (ZLC) technology, which was first developed by Eic and Ruthven, 34,35 represents a versatile yet easily accessible approach that has been widely used for studying the diffusivity of guest molecules in nanoporous. materials, [36][37][38][39] the purpose of this paper is to establish a theoretical approach to quantify the respective contributions of intracrystalline diffusion and surface barriers to overall effective diffusivity 6,40 measured by ZLC.…”

Measuring Mass Transfer of n-Hexane and 2-Chloroethyl Ethyl Sulfide in Sorbent/Polymer Fiber Composites Using a Volumetric Adsorption Apparatus

“…To minimize error in our mass transport measurements, low pressure regions prior to the saturation of the porous materials were analyzed so that the changes in pressure could most accurately be measured by the instrument . Mass transfer in MOF-808 was fitted according to our previously published protocol, which uses the assumption of spherical particles. ,, However, due to the high aspect ratio of the fibers, arising from the continuous generation of the fibers via the electrospinning process, a new diffusion model is needed to capture transport in an infinitely long cylindrical shape where mass transport occurs in a radial direction. , …”

“…52,53,56 However, due to the high aspect ratio of the fibers, arising from the continuous generation of the fibers via the electrospinning process, a new diffusion model is needed to capture transport in an infinitely long cylindrical shape where mass transport occurs in a radial direction. 37,38 Here we adopted the framework of Brandani et al and extended the theory to materials of cylindrical shapes. By assuming the ideal gas condition in the system when the pressure is sufficiently low, the mass balance of the volumetric adsorption system (Figure 2) in each dosing cycle is described by the following equations:…”

“…Studying mass transport in porous materials is necessary for their application as both catalysts and adsorbents. − However, delineating the relative contributions to mass transport from diffusion within the bulk material versus surface permeation remains challenging. , Care must be taken to apply the most accurate models when fitting experimental data. For instance, transport in fibrous materials can be considered along their axial or radial directions, , ultimately dependent on the fiber structure and aspect ratio . In addition, experimental characterization of molecular transport typically requires specialized and expensive facilities, such as confocal Raman microscopy or infrared Raman microscopy; although these methods provide beneficial insights, they suffer from limited accessibility, inhibiting the development of new applications of porous materials.…”

“…34,35 Care must be taken to apply the most accurate models when fitting experimental data. For instance, transport in fibrous materials can be considered along their axial 36 or radial directions, 37,38 ultimately dependent on the fiber structure and aspect ratio. 39 Raman microscopy 40 or infrared Raman microscopy; 41 although these methods provide beneficial insights, they suffer from limited accessibility, inhibiting the development of new applications of porous materials.…”