Facile One-Pot Synthesis of Mechanically Robust Biopolymer–Silica Nanocomposite Aerogel by Cogelation of Silicic Acid with Chitosan in Aqueous Media
| Autor: | Eunho Jeong, Wim J. Malfait, J. William Suggs, Beatrice Fischer, Yucheng Zhang, Haixun Xu, Shanyu Zhao, Emanuele Angelica, William M. Risen, Matthias M. Koebel |
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| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Nanocomposite Materials science Renewable Energy Sustainability and the Environment General Chemical Engineering Aerogel 02 engineering and technology General Chemistry engineering.material Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Chitosan chemistry.chemical_compound chemistry Chemical engineering engineering Environmental Chemistry Silicic acid Biopolymer 0210 nano-technology Porosity |
| Zdroj: | ACS Sustainable Chemistry & Engineering. 4:5674-5683 |
| ISSN: | 2168-0485 |
| DOI: | 10.1021/acssuschemeng.6b01574 |
| Popis: | A sustainable aqueous-based route is reported for the synthesis of low density mesoporous silica/chitosan nanocomposite aerogels by cogelation of a chitosan biopolymer dissolved in silicic acid. The random “cluster–cluster” aggregate silica structure intertwined at the molecular level with chitosan yields a three-dimensional semi-interpenetrating network with greatly improved mechanical properties when compared to a silica aerogel of similar density. The physical properties of the resulting aerogels depend significantly on the gelation pH. A silica aerogel reference material synthesized at a low pH of 3 features very low density and high porosity resulting in a highly elastic behavior but comparatively weak skeletal structure (final strength 80%) but with greatly increased yield strength (>7 MPa). Importantly, the rein... |
| Databáze: | OpenAIRE |
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