التفاصيل البيبلوغرافية
| العنوان: |
Assessment of the effect of Bi2Te3 thermoelectric crystal nanophase on the pyrolysis kinetics of biopolymer nanocomposites. |
| المؤلفون: |
Zhmurova, Anna V., Zvereva, Marina V. |
| المصدر: |
Journal of Thermal Analysis & Calorimetry; Jul2023, Vol. 148 Issue 13, p6465-6485, 21p |
| مصطلحات موضوعية: |
PYROLYSIS kinetics, THERMOELECTRIC effects, NANOPARTICLE size, DIFFERENTIAL scanning calorimetry, NANOCOMPOSITE materials |
| مستخلص: |
The kinetics of the thermal decomposition of pure Larix sibirica arabinogalactan (AG) and AG-stabilized Bi2Te3 nanoparticles was studied. The analysis was performed using thermogravimetry, differential scanning calorimetry and pyrolysis product mass-spectrometry at the heating rates of 10, 20, and 40 K min−1 in an argon atmosphere. Kinetic triplet of the samples was determined by such conventional linear integral isoconversional methods as Kissinger–Akahira–Sunose, Ozawa–Flynn–Wall, Starink and applying Criado's master plot methodology. The study revealed the size-dependent behavior of thermal decomposition of Bi2Te3 nanoparticles. It was found that activation energy (Ea) of moisture desorption decreased after the introduction of Bi2Te3 nanoparticles into AG. The increase of their mean size from 33.6 to 71.0 nm was accompanied by a significant reduction of the mean Ea of moisture desorption from 74.0 to 48.5 kJ mol−1. Besides, the introduction of nanoparticles led to the appearance of an additional decomposition stage most probably corresponding to the removal of water, more strongly bound with the surface of nanoparticles. The stage has sufficiently high Ea values of 506.8 kJ mol−1 for sample with mean nanoparticle size of 33.6 nm and 563.4 kJ mol−1 for one of 71.0 nm. This directly indicates that the size factor of the bismuth telluride crystal nanophase determines the overall thermal stability of the nanocomposites. In particular, this reveals the catalytic role of Bi2Te3 nanoparticles in the general mechanism of thermal decomposition of polysaccharide-based nanocomposites with the prevailing influence of the surface interaction of Bi2Te3 nanoparticles with polysaccharide macromolecules. The findings on the thermal decomposition of AG-stabilized Bi2Te3 nanoparticles should be considered when predicting potential applications of polysaccharide-based thermoelectric nanomaterials. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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