Gold- and silver-containing bionanocomposites based on humic substances extracted from coals
| Autor: | Tamara I. Vakul'skaya, Aleksander N. Kozlov, Boris G. Sukhov, Maksim V. Penzik, Nikolay I. Tikhonov, Spartak S. Khutsishvili, M. V. Lesnichaya, Galina P. Aleksandrova, Dmitrii V. Pavlov |
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| Rok vydání: | 2019 |
| Předmět: |
Nanocomposite
Materials science Thermal decomposition Nanoparticle 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010406 physical chemistry 0104 chemical sciences Metal Chemical engineering Transmission electron microscopy visual_art visual_art.visual_art_medium Thermal stability Particle size Physical and Theoretical Chemistry 0210 nano-technology Thermal analysis |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 137:1181-1188 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-019-08059-1 |
| Popis: | Thermal stability, structural peculiarities and thermal destruction of functional groups of the matrix, which are responsible for the stabilization of the nanosystems, of the gold- and silver-containing medicinally important water-soluble nanocomposites synthesized from therapeutic humic substances, isolated from brown coal of Baga Nuur field of Mongolian sources, have been studied. A crucial problem in biomedical and engineering application of the silver- and gold-containing nanocomposites is their stability upon heating, for example, during sterilization at high temperatures in medicine or laser action, which can heat a system, in plasmon technologies. All compounds have been investigated by complex modern physical–chemical methods (electron paramagnetic resonance and infrared spectroscopies, X-ray diffraction analysis, transmission electron microscopy and others). Thermal analysis of Ag0 and Au0 nanocomposites on the basis of humic matrices, as well as the initial humic substance, has been carried out. It is shown that the thermal decomposition of the nanocomposites depends on the nature of the metal. It is found that stable zero-valent nanoparticles of noble metals with an average particle size of 6–17 nm are formed in a natural matrix. The nanocomposites obtained are aggregatively stable for a long time, preserving their properties intact, that is extremely important for promising medicinal substances. |
| Databáze: | OpenAIRE |
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