Preparation method of composite thermoelectric material based on regenerated nanocellulose
A technology of nano-cellulose and thermoelectric materials, which is applied in the manufacture/processing of thermoelectric devices, materials for lead-out wires of thermoelectric devices, fiber raw material processing, etc. It can solve problems such as high Seebeck coefficient, insufficient mechanical properties, and large surface of fibers. Achieve high Seebeck coefficient, excellent mechanical properties, and reduce thermal conductivity
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[0028] The present invention provides a method of preparing a composite thermoelectric material based on regenerative nanocarbon, including:
[0029] 1) Preparation of nancellulose aqueous solution:
[0030] A. Take the paper with water and wash the impurities, and the dispersion is carried out after dilution of ion water to obtain pulp.
[0031] In this step, the paper includes a toilet paper, rice paper, A4 paper, and the waste newspaper. The main component is natural vitamins; preferably, the paper can be cut after cutting the paper, soak it to shorten the soaking time, the concentration of the pulp is 0.1. ~ 10 wt%, preferably 1 wt%. Specifically, the diluted solution can be dispersed by mechanical stirring, ball milling or ultrasonic dispersion.
[0032] B. TEMPO, NABR, and NaClo were added to the pulp, and the pH was adjusted with sodium hydroxide so that the pH was alkaline.
[0033] In this step, TEMPO, NABR, and NaClo were added, and the mixture can be stirred in a suffic...
Embodiment 1
[0048] (1) Cut 2G waste rice paper, wash away impurities, soaked in 200 ml of water and stirred at room temperature for 1 h, it was prepared from a homogenizer for 1 h, and prepared a concentration of pulp;
[0049] (2) 0.032 g of TEMPO, 0.2 g of sodium bromide and 20 mL of sodium hypochlorite were added, stirred at room temperature, and 0.5 mol / L of aqueous sodium hydroxide aqueous solution was added to adjust the pH, so that the pH was maintained near 10;
[0050] (3) After the solution is transparent and the pH is not significantly changed, centrifugation was carried out under 8000 rpm, and the supernatant was removed, and then the centrifugal precipitate was diluted with water.
[0051] (4) 0.5 g of SWCNT powder was added to 100 mL of ethanol to give a concentration of SWCNT suspension;
[0052] (5) A hydrogel film was prepared by vacuum filtration in a 200 ml step (3) in the 5 ml step (3) and 50 ml of step (4).
[0053] (6) The hydrogel film obtained in step (5) was freeze ...
Embodiment 2
[0058] Methods Example 1, only discarded rice paper in implementation 1 step (1) was changed to A4 paper, and the conductivity of the regenerative nanocolymeral / SWCNT composite gas gel film having a microporous structure was 532.3s. cm -1 The SEEBECK coefficient is 50.7μVK -1 .
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