A Study of the Physical and Mechanical Properties of Aerogels Obtained from Bacterial Cellulose
| Autor: | Nikolay Alexandrovich Pestov, Michael V Shchankin, Dmitriy A Uglanov, V. I. Platonov, Victor V. Revin, Vladimir P. Mishkin |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics Spectrophotometry Infrared Bioengineering Young's modulus 02 engineering and technology 010402 general chemistry 01 natural sciences Biomaterials chemistry.chemical_compound symbols.namesake Thermal conductivity Materials Testing Materials Chemistry Thermal stability Composite material Porosity Cellulose Bacteria Temperature Aerogel 021001 nanoscience & nanotechnology Compression (physics) 0104 chemical sciences chemistry Bacterial cellulose symbols Microscopy Electron Scanning Degradation (geology) 0210 nano-technology Gels |
| Zdroj: | Biomacromolecules. 20(3) |
| ISSN: | 1526-4602 |
| Popis: | Aerogels with a density of 4.2-22.8 kg/m3 were obtained from bacterial cellulose synthesized under static and dynamic cultivation conditions on a molasses medium. The strength properties and porous structure of the aerogels strongly depended on their density. With an aerogel density of 22.8 kg/m3, the modulus of elasticity at 80% compression of the sample was 0.1 MPa. The decrease in the density of aerogels led to an increase in the pore sizes ranging from 20 to 1000 μm and a decrease in the modulus of elasticity. These characteristics were more pronounced in aerogels obtained from bacterial cellulose under static cultivation conditions. The aerogels had a low coefficient of thermal conductivity (0.0257 W m-1 °C-1), which is comparable to the thermal conductivity of air, and moderate thermal stability because the degradation processes of the aerogels began at 237 °C. The aerogels obtained from bacterial cellulose had high sound absorption coefficients in the frequency range of 200-5000 Hz, which makes it possible to use the aerogels as heat- and sound-insulating materials. |
| Databáze: | OpenAIRE |
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