Method for preparing nanometer barium sulfate particles by water in oil type micro-emulsion method

[0024] (1) Put 0.05mol / L ammonium sulfate aqueous solution, Tween 60, n-pentanol, and cyclohexane in a three-necked flask according to the mass ratio of 1:7.5:2.3:87.2, and stir well to form microemulsion I;

[0025] (2) Put 0.05mol / L barium chloride aqueous solution, Tween 60, n-pentanol, and cyclohexane in a three-necked flask according to the mass fraction ratio of 1:7.5:2.3:87.2, and stir well to form microemulsion II;

[0026] (3) Quickly add the microemulsion I to the microemulsion II, seal the three-neck flask, stir at 25°C for 30 minutes, stop the reaction, and age for 12 hours;

[0027] (4) The reaction solution obtained in step (3) is heated at 80°C to break the emulsion, centrifuge, wash, and dry to obtain cubic nano barium sulfate particles with an average particle diameter of 15nm. The SEM diagram is as follows figure 2 shown.

[0029] (1) Put 0.1mol / L ammonium sulfate aqueous solution, Tween 40, n-pentanol, and n-hexane in a three-necked flask according to the mass ratio of 1:5:3.8:15, and stir well to form microemulsion I;

[0030] (2) Put 0.1mol / L barium chloride aqueous solution, Tween 40, n-pentanol, and n-hexane into a three-necked flask according to the mass fraction ratio of 1:5:3.8:15, and stir well to form microemulsion II;

[0031] (3) Quickly add the microemulsion I to the microemulsion II, seal the three-neck flask, stir at 25°C for 30 minutes, stop the reaction, and age for 12 hours;

[0032] (4) After the reaction solution obtained in step (3) is heated at 100°C to break the emulsion, centrifuge, wash, and dry, the amorphous nano-barium sulfate particles with a particle size of 21-80nm are obtained, and the SEM diagram is as follows image 3 shown.

[0034] (1) Put 0.15mol / L sodium persulfate aqueous solution, Tween 60, n-hexanol, and n-hexane in a three-necked flask according to the mass ratio of 1:12.5:3.1:23.5, and stir well to form microemulsion I;

[0035] (2) Put 0.15mol / L barium acetate aqueous solution, Tween 60, n-hexanol, and n-hexane into a three-necked flask according to the mass fraction ratio of 1:12.5:3.1:23.5, and stir well to form microemulsion II;

[0036] (3) Quickly add the microemulsion I to the microemulsion II, seal the three-neck flask, stir at 25°C for 30 minutes, stop the reaction, and age for 12 hours;

[0037] (4) After the reaction solution obtained in step (3) is heated at 80° C. to demulsify, centrifuge, wash, and dry, the cubic nano-barium sulfate particles with a particle diameter of 32-100 nm are obtained. The SEM diagram is as follows: Figure 4 shown.