期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 93, 期 -, 页码 88-95出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2016.01.012
关键词
Subcritical water; Cellulose nanocrystals; Pressure effect; Experimental design; Thermal stability
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Basque Government (Postdoctoral Development Program)
- Conselho Nacional de Pesquisa e Desenvolvimento (CNPq)
- LabEx Tec 21 (Investissements d'Avenir) [ANR-11-LABX-0030]
- Energies du Futur and PolyNat Carnot Institutes (Investissements d'Avenir) [ANR-11-CARN-007-01, ANR-11-CARN-030-01]
Cellulose nanocrystals (CNC) have a wide range of potential applications. For classical CNC production, amorphous cellulose is hydrolyzed using concentrated sulfuric acid; however, subcritical water can also accomplish this objective. Here, for the first time to the best of our knowledge, we study the experimental conditions employed in subcritical water treatment, to investigate the behavior of the technique and the properties of the products in an experimental domain of 120-200 degrees C temperature and 8.1-20.3 MPa pressure. We observed the CNC formation in all the different reaction conditions tested; however, the yields were lower than the classical production of CNC. The yield of the reaction was directly proportional to the pressure. On the other hand, temperature had a directly proportional effect on the stability of the suspension and an inversely proportional effect on the whiteness of the CNC produced. The most drastic reaction conditions produced CNCs was chemically indistinguishable from raw cellulose, having the same crystalline structure and crystallinity index, albeit with nanometric size. (C) 2016 Elsevier. B.V. All rights reserved.
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