A Fenton-like System (Cu(II)/H2O2) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface
| Autor: | Ilia S. Martakov, Vasily I. Mikhaylov, M. A. Torlopov, Petr A. Sitnikov, Elena V. Udoratina, Yevgeny A. Golubev |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Nanoparticle chemistry.chemical_element 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Copper Industrial and Manufacturing Engineering Thermogravimetry chemistry.chemical_compound Acetic acid Crystallinity 020401 chemical engineering chemistry Dynamic light scattering Thermal stability 0204 chemical engineering Cellulose 0210 nano-technology Nuclear chemistry |
| Zdroj: | Industrial & Engineering Chemistry Research. 58:20282-20290 |
| ISSN: | 1520-5045 0888-5885 |
| Popis: | A preparation process of cellulose nanocrystals using a Fenton-like system was presented. Rod-shaped cellulose nanocrystals were isolated after treatment in the H2O2/acetic acid/2–6 mol % copper acetate system. The morphology and sizes of rod-shaped particles were determined by AFM (atomic force microscopy) and cryo-EM (cryo-electron microscopy). X-ray diffraction proves that the prepared particles have a natural polymorphic modification of cellulose I with a high crystallinity index. Thermogravimetry data indicates a slight decrease in thermal stability of the particles when compared to starting cellulose, correlating with an increase in the number of carbonyl groups determined by chemical analysis. Using pK spectroscopy, active acid–base surface sites (pKi 5.5 and 7.9) were quantitatively determined. The cellulose nanoparticles formed stable hydrosols. Using photometry and dynamic light scattering, it has been established that the critical concentration of coagulation of sols is 76 mM KCl. |
| Databáze: | OpenAIRE |
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