Porous materials: microporosity induced by the shape and length of the pores

  1. Leonid TitelmanORCID Logo

Submitting author affiliation: Ben-Gurion University of the Negev, Beer Sheva, Israel

Beilstein Arch. 2020, 202089. doi:10.3762/bxiv.2020.89.v1

Published 30 Jul 2020

  • Preprint


There are insufficient parameters to explain the appearance of microporosity in porous materials. One of the parameters associated with micropores is the generalized pore shape factor F, which includes, as special cases, the known slit, circular and spherical model pore shapes. F covers the shapes between the slit (F = 2000) and spherical (F = 6000), as well as beyond. For the intermediate shape, one can estimate proportions of model motifs. The transition of the shape from one model to another is accompanied by the appearance of micropores (or vice versa); corresponding dependencies are given.

Nanotechnologies, such as self-assembly of ordered mesoporous materials (OMMs), the production of carbon OMMs as replicas of silica matrixes, supercapacitors made of carbon nanofibres (CNF), a hybrid CNF/MWCNT for use in lithium-ion batteries, carbon xerogels with Ni additive for storage of H2, catalysis and others are discussed; they cover materials with F in the range 1,100 ÷ 32,600.

A pore surface length index Lsi is proposed for any pore shape; it supplements the generalized parameters causing stresses, deformations and micropores. Using F and Lsi, it was discovered, that activated carbon, obtained as a replica of non-circular matrix of silica, behaves like a compressed spring, which, after removal of silica, expands and its pores become circular.

A concept of molecular sieving based on the shape of molecules is proposed and demonstrated by the example of lipase immobilization.

Application of the proposed parameters improves understanding of many published and new results.

Keywords: Generalized parameter; Micropore; Molecular sieve; Pore length; Pore shape.

Supporting Information

Format: XLSX Size: 38.5 KB   Download

How to Cite

When a peer-reviewed version of this preprint is available in the Beilstein Journals, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

Titelman, L. Beilstein Arch. 2020, 202089. doi:10.3762/bxiv.2020.89.v1

Download Citation
Download RIS (Reference Manager) Download BIB (BIBTEX)

© 2020 Titelman; licensee Beilstein-Institut.
This is an Open Access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited.
The license is subject to the Beilstein Archives terms and conditions: (https://www.beilstein-archives.org/xiv/terms)

Other Beilstein-Institut Open Science Activities