Synthesis and conservation of cellulose nanocrystals
| Autor: | Luciana Di Giorgio, Adriana Noemi Mauri, Lucía Martín, Pablo Rodrigo Salgado |
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| Rok vydání: | 2019 |
| Předmět: |
Morphology (linguistics)
Materials science Aggregate (composite) Polymers and Plastics Organic Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Microcrystalline cellulose Cellulose nanocrystals chemistry.chemical_compound Chemical engineering chemistry Tested time Materials Chemistry Acid hydrolysis 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Carbohydrate polymers. 238 |
| ISSN: | 1879-1344 |
| Popis: | This work deals with the preparation of cellulose nanocrystals (CNC) from microcrystalline cellulose by acid hydrolysis, discusses how their characteristics varied according to the drying technique used for their conservation and analyzes their re-dispersion in water. A stable water dispersion of “rod” or “needle” type CNC (≈5 nm of diameter, 276 nm of length and 41 mV of Z potencial) was initially prepared and then dried by lyophilization and spray. Thus powders with similar cristalinity but different morphology were obtained, while CNC seemed to aggregate in such an extent that hindered their re-dispersion in water. Only lyophilized CNC could be re-dispersed in water and maintained stable in dispersion for at least 24 h, when working with concentrations of CNC higher than a certain minimum value (3 %) and after submitting them to intense ultrasound treatments. The tested time achieved should be enough to allow their subsequent use in several applications. |
| Databáze: | OpenAIRE |
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