Enhancement of the nanofibrillation of wood cellulose through sequential periodate-chlorite oxidation |
| |
Authors: | Liimatainen Henrikki Visanko Miikka Sirviö Juho Antti Hormi Osmo E O Niinimaki Jouko |
| |
Institution: | Fiber and Particle Engineering Laboratory, University of Oulu, Oulu FI-90014, Finland. Henrikki.Liimatainen@oulu.fi |
| |
Abstract: | Sequential regioselective periodate-chlorite oxidation was employed as a new and efficient pretreatment to enhance the nanofibrillation of hardwood cellulose pulp through homogenization. The oxidized celluloses with carboxyl contents ranging from 0.38 to 1.75 mmol/g could nanofibrillate to highly viscous and transparent gels with yields of 100-85% without clogging the homogenizer (one to four passes). On the basis of field-emission scanning electron microscopy images, the nanofibrils obtained were of typical widths of approximately 25 ± 6 nm. All of the nanofibrillar samples maintained their cellulose I crystalline structure according to wide-angle X-ray diffraction results, and the crystallinity index was approximately 40% for all samples. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|