Effects of fibre dimension and charge density on nanocellulose gels
| Autor: | Warren Batchelor, Llyza Mendoza, Thilina Gunawardhana, Gil Garnier |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Softwood
Materials science Pulp (paper) Charge density 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nanocellulose Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Rheology chemistry Chemical engineering Hardwood engineering Surface charge Cellulose 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 525:119-125 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2018.04.077 |
| Popis: | Hypothesis Carboxylated cellulose nanofibres can produce gels at low concentrations. The effect of pulp source on the nanocellulose fibre dimension and gel rheology are studied. It is hypothesised that fibre length and surface charge influence aspects of the gel rheological properties. Experiments TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl)- mediated oxidised cellulose nanofibres from never-dried hardwood and softwood pulp and containing different charge levels were produced and characterized. Steady-state and dynamic rheological studies were performed to ascertain the effects of pulp type on gel behavior and properties. Findings Nanocellulose fibres extracted from softwood (SW-TOCN) and hardwood (HW-TOCN) pulp exhibit similar widths but different length dimensions as shown via AFM analysis. Rheological measurements show that the dynamic moduli (G′ and G′′) of nanocellulose gels are independent of pulp source and are mostly influenced by fibre concentration. Differences in the steady-state behavior (i.e. viscosity) at constant surface charge can be attributed to differences in fibre length. Increasing the surface charge density influences the critical strain and the viscosity at the percolation concentration (0.1 wt%) due to higher electrostatic interactions. |
| Databáze: | OpenAIRE |
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