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Drying of Hierarchically Organized Porous Silica Monoliths-Comparison of Evaporative and Supercritical Drying.
| Content Provider | Europe PMC |
|---|---|
| Author | Kohns, Richard Torres-Rodríguez, Jorge Euchler, Daniel Seyffertitz, Malina Paris, Oskar Reichenauer, Gudrun Enke, Dirk Huesing, Nicola |
| Editor | Smirnova, Irina Gurikov, Pavel Schroeter, Baldur |
| Copyright Year | 2023 |
| Abstract | In this study, we present a detailed comparison between a conventional supercritical drying process and an evaporative drying technique for hierarchically organized porous silica gel monoliths. These gels are based on a model system synthesized by the aqueous sol–gel processing of an ethylene-glycol-modified silane, resulting in a cellular, macroporous, strut-based network comprising anisotropic, periodically arranged mesopores formed by microporous amorphous silica. The effect of the two drying procedures on the pore properties (specific surface area, pore volume, and pore widths) and on the shrinkage of the monolith is evaluated through a comprehensive characterization by using nitrogen physisorption, electron microscopy, and small-angle X-ray scattering. It can clearly be demonstrated that for the hierarchically organized porous solids, the evaporative drying procedure can compete without the need for surface modification with the commonly applied supercritical drying in terms of the material and textural properties, such as specific surface area and pore volume. The thus obtained materials deliver a high specific surface area and exhibit overall comparable or even improved pore characteristics to monoliths prepared by supercritical drying. Additionally, the pore properties can be tailored to some extent by adjusting the drying conditions, such as temperature. |
| Journal | Gels |
| Volume Number | 9 |
| PubMed Central reference number | PMC9858606 |
| Issue Number | 1 |
| PubMed reference number | 36661837 |
| e-ISSN | 23102861 |
| DOI | 10.3390/gels9010071 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2023-01-16 |
| Access Restriction | Open |
| Rights License | Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors. |
| Subject Keyword | silica monolith supercritical drying evaporative drying ambient pressure drying |
| Content Type | Text |
| Resource Type | Article |
| Subject | Bioengineering Biomaterials Polymers and Plastics Organic Chemistry |
