Cellulose nanosheet material and preparation method thereof
A technology of cellulose and nanosheets, which is applied in the field of discovery and preparation of cellulose nanosheet materials, and can solve problems such as the lack of reports on cellulose two-dimensional materials
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Embodiment 1
[0028] The bleached wood pulp was crushed into segments with a length of 2mm and a width of 2mm, and vacuum-dried at 80°C for 4h. Take 30g of dried cellulose and mechanically grind it with PTFE for 32h. The grinding balls are zirconia balls with diameters of 20mm, 10mm, and 6mm, and the mass is 540g. The grinding speed is 540r / min.
[0029] The obtained powder was mixed with ethanol to form a 0.05wt.% suspension, 100W power was used for ultrasonication in an ice-water bath for 5 minutes, and then the supernatant was collected by centrifugation to obtain a dispersion of cellulose nanosheets. Take 2 μl of the dispersion, spin-coat it on a clean silicon wafer, and let it dry naturally. Its shape and thickness were measured with an atomic force microscope, figure 1 It is an AFM image of the cellulose nanosheets of Example 1, and the measurement shows that the thickness of the cellulose nanosheets is 4.5nm±0.2nm, and the shape is irregular. The TEM and electron diffraction analys...
Embodiment 2
[0031] The bleached wood pulp was crushed into segments with a length of 2mm and a width of 2mm, and vacuum-dried at 80°C for 4h. Take 30g of dried cellulose and mechanically grind it with PTFE for 4 hours. The grinding balls are zirconia balls with diameters of 20mm, 10mm, and 6mm and a mass of 540g. The grinding speed is 540r / min.
[0032] The obtained powder was mixed with ethanol to form a 0.05wt.% suspension, ultrasonicated in a 100W ice-water bath for 5min, and then centrifuged to obtain the supernatant to obtain a dispersion of cellulose nanosheets. Take 2 μl of the dispersion, spin-coat it on a clean silicon wafer, and let it dry naturally. Using an atomic force microscope to measure its morphology and thickness, in addition to finding a sheet of about 4nm, a thicker superimposed sheet structure was also found. figure 2 It is the error map of the AFM test of the cellulose nanosheets in Example 2, which can more clearly reflect the layered stacked structure of the nan...
Embodiment 3
[0034] The bleached wood pulp was crushed into segments with a length of 2mm and a width of 2mm, and vacuum-dried at 80°C for 4h. Take 30g of dried cellulose and mechanically grind it with PTFE for 16 hours. The grinding balls are zirconia balls with diameters of 20mm, 10mm, and 6mm, and the mass is 540g. The grinding speed is 540r / min.
[0035] The obtained powder was mixed with ethanol to form a 0.05wt.% suspension, ultrasonicated in a 100W ice-water bath for 5min, and then centrifuged to obtain the supernatant to obtain a dispersion of cellulose nanosheets. Take 2 μl of the dispersion, spin-coat it on a clean silicon wafer, and let it dry naturally. Using an atomic force microscope to measure its morphology and thickness, cellulose nanosheets of different thicknesses were found, image 3 It is the AFM picture of the cellulose nanosheets of Example 3. It can be seen that there are not only nanosheets with a height of about 4.3nm, but also thicker nanosheets such as about 8....
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