Insights into the production and physicochemical properties of oxycellulose microcrystalline with coexisting crystalline forms
| Autor: | Nhol Kao, Mohamed Rashid Ahmed-Haras, Sakinul Islam, Liam Ward |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology Biochemistry 03 medical and health sciences Crystallinity chemistry.chemical_compound X-Ray Diffraction Structural Biology Spectroscopy Fourier Transform Infrared Cellulose Oxidized Thermal stability Cellulose Fourier transform infrared spectroscopy Thermal analysis Molecular Biology 030304 developmental biology 0303 health sciences Thermal decomposition food and beverages General Medicine 021001 nanoscience & nanotechnology Nanocrystalline material Microcrystalline chemistry Chemical engineering 0210 nano-technology |
| Zdroj: | International Journal of Biological Macromolecules. 146:150-161 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2019.12.083 |
| Popis: | Oxycellulose microcrystalline (Oxy-MCC) was prepared utilizing nonwood agro-industrial residue, rice husk (RH), via consecutive soda delignification and non-acidic catalytic oxidation. The resultant Oxy-MCC, with a 31 wt% yield, has granular microstructured particles with an average diameter of 41.66 ± 4.11 μm. The porous morphology has been observed in Oxy-MCC micrographs, using scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) and TGA/DTG thermal analysis indicated the presence of typical cellulose characteristics, while the presence of carbonyl spectral peak signalized the efficacy of D-RH oxidation process. The x-ray diffraction (XRD) confirmed the coexistence of cellulosic crystalline forms of cellulose I and cellulose II with 84.8% crystallinity index. Significant growth of crystallite size was observed from 1.7 nm (RH) to 9.4 nm (Oxy-MCC). The maximum decomposition temperature (Tmax) was found to be 324 °C, thus indicating good thermal stability. Oxy-MCC showed, overall, attractive thermal and physicochemical properties for oxycellulose nanocrystalline (Oxy-NCC) production. |
| Databáze: | OpenAIRE |
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