Carboxylated nanocellulose foams as superabsorbents
| Autor: | Llyza Mendoza, Emma Downey, Laila Hossain, Warren Batchelor, Gil Garnier, Camilla Scales |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Surface Properties 02 engineering and technology 010402 general chemistry 01 natural sciences Nanocellulose Biomaterials Cyclic N-Oxides chemistry.chemical_compound Colloid and Surface Chemistry Hardwood Carboxylate Surface charge Cellulose Particle Size Polyacrylic acid Charge density 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Chemical engineering Kraft process Nanoparticles Adsorption 0210 nano-technology Oxidation-Reduction |
| Zdroj: | Journal of colloid and interface science. 538 |
| ISSN: | 1095-7103 |
| Popis: | Hypothesis Carboxylated nanocellulose fibres formed into foam structures can demonstrate superabsorption capacity. Their performance can be engineered by changing process variables. Experiments TEMPO-oxidised cellulose nanofibres of varying concentration and surface charge are produced from hardwood kraft pulp. Foams were prepared through a 2-step freezing and lyophilisation process. The absorption capacity of water and saline solution (0.9 wt%) were measured as a function of time and related to the foam structure. Findings The absorption capacity of nanocellulose foams can be manipulated from initial gel properties and processing conditions. Pore structure and distribution of nanocellulose foams are dictated by fibre content and charge density and freezing rate. The best performing foams are at 0.3–0.5 wt%, with a carboxylate concentration of 1.2 mmol/g and frozen at −86 °C before freeze-drying, which can absorb 120 g H2O/g fibre. Fibre surface charge influences the absorption capacity of the foams by dictating the amount of participating carboxylate groups. Absorption capacity in saline (60 g/g) is lower than in deionised water (120 g/g); but is only slightly lower than that of a commercial polyacrylic acid (PAA) SAPs (80 g/g). Nanocellulose foams are attractive renewable alternatives for superabsorbent applications, contributing to a reduction of plastic microspheres. |
| Databáze: | OpenAIRE |
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