Quick nano-copper particle preparation method
A nano-copper particle, fast technology, applied in the field of materials, can solve problems such as uneven particle size distribution, high temperature requirements, and long preparation process, and achieve the effects of saving reaction time, increasing reaction rate, and increasing yield
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[0050] Example 1
[0051] (1) Mix ethanol and water to make an ethanol aqueous solution, where the volume ratio of water to ethanol is 2:1;
[0052] (2) The reducing agent is dissolved in the ethanol aqueous solution of step (1) to prepare a reducing agent solution; the reducing agent is sodium hypophosphite and citric acid, wherein the molar ratio of citric acid to sodium hypophosphite is 1 :2; The concentration of the reducing agent in the ethanol aqueous solution is 5.20×10 -3 g / mL;
[0053] (3) Under stirring conditions, dissolve the copper salt and the dispersant in the ethanol aqueous solution of step (1) to prepare a copper salt dispersant solution; the dispersant is oleic acid; the mass ratio of the dispersant to the copper salt is 1:10; the concentration of copper salt in the ethanol aqueous solution is 0.003g / ml; the copper salt is copper sulfate pentahydrate;
[0054] (4) Heat the reducing agent solution to 85°C; under stirring and ultrasonic conditions, add the copper sal...
Example Embodiment
[0064] Example 2
[0065] The method is the same as in Example 1, the difference is:
[0066] (1) The dispersant is polyvinylpyrrolidone;
[0067] (2) The average particle diameter of the obtained nano-copper particles covered with dispersant is 210nm;
[0068] Fourier transform infrared spectroscopy such as figure 2 As shown; EDS energy spectrum as Figure 4 As shown in the figure, it can be seen that in addition to Cu element, it also contains C, O and other elements, which shows that its surface is covered with oleic acid dispersant; the ultraviolet absorption spectrum is as Picture 9 Shown
[0069] Using the above-mentioned nano-copper particles covered with a dispersant as an additive, added to crude oil to test the wear scar diameter curve, the results are as follows Picture 12 As shown; when the additive amount is 0.2%, the maximum non-stick load (P B ) Value is 280N; after adding additives, the maximum non-seize load is increased by 12%.
Example Embodiment
[0070] Example 3
[0071] Carry out 4 groups of experiments and 5 groups of comparative experiments respectively. The numbers of the 5 groups of comparative experiments are 1#, 2#, 3#, 4# and 5#; the numbers of the 4 groups of experiments are 6#, 7#, 8# and 9#; The method is the same as in Example 1, the difference is:
[0072] (1) The volume ratio of water to ethanol in the ethanol aqueous solution is 2:2;
[0073] (2) The molar ratio of citric acid and sodium hypophosphite in the reducing agent solution is 1:4; the concentration of the reducing agent in the ethanol aqueous solution is 6.80×10 -3 g / mL;
[0074] (3) The mass ratio of the dispersant to the copper salt in the copper salt dispersant solution is 1:15; the concentration of the copper salt in the ethanol aqueous solution is 0.01g / ml;
[0075] (4) Heat the reducing agent solution to 65°C; under stirring and ultrasonic conditions, add the copper salt dispersant solution dropwise to the reducing agent solution at a temperature ...
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