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Biomacromolecules. 2019 Mar 11;20(3):1401-1411. doi: 10.1021/acs.biomac.8b01816. Epub 2019 Feb 26.

A Study of the Physical and Mechanical Properties of Aerogels Obtained from Bacterial Cellulose.

Author information

1
National Research Ogarev Mordovia State University , Saransk 430005 , Russia.
2
Samara National Research University , Samara 443086 , Russia.

Abstract

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.

PMID:
30768255
DOI:
10.1021/acs.biomac.8b01816

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