Preparation method of magnesium oxide nanocrystalline
A nanocrystalline and magnesium oxide technology, applied in the direction of magnesium oxide, nanotechnology, nanotechnology, etc., can solve the problems of limited shape and poor dispersion, and achieve the effects of fine particle size, improved dispersion and reduced production cost
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Embodiment 1
[0041] (1) Weigh MgCl 2 ·6H 2 O18.52g, dissolved in 400mL of pH=10.0 buffer solution (buffer pair formed by ammonium chloride and ammonia water), added 1.8g of PEG1000 and 35mL of deionized water to form a transparent solution; the concentration can be adjusted as required;
[0042] (2) Heating while continuously feeding high-purity carbon dioxide gas into the transparent solution, raising the temperature to 60 degrees, and reacting for 2 hours; the feeding speed of carbon dioxide can be adjusted between 0.005 / 0.015, and the system is controlled at 0.01 L / h is suitable.
[0043] (3) quickly place the reaction system in an ice-water bath after the reaction;
[0044](4) The cooled product is subjected to suction filtration, washed with a large amount of deionized water to neutrality, and the obtained product is washed 1 to 2 times with absolute ethanol;
[0045] (5) the white reactant after suction filtration is dried overnight in an oven at 80 degrees;
[0046] (6) Calcinin...
Embodiment 2
[0050] This comparative example is basically the same as Example 1, the only difference being that the pH of the buffer solution is 11.0;
[0051] Among the magnesium oxide nanomaterials synthesized in this ratio, at first its intermediate products are different ( Figure 4 ), compared with figure 1 It can be found that when the alkalinity of the buffer solution used is enhanced, the intermediate product is basic magnesium carbonate. After calcining at 800 degrees, the obtained product is magnesia with higher crystallinity and purity ( Figure 5 ). From the FE-SEM characterization results of the samples before and after firing, it can be seen that ( Figure 6a and Figure 6b ), the intermediate is in the form of flakes before calcination, and becomes a three-dimensional short-forked magnesium oxide nanopowder after calcination. The longest branch is about 100nm, and the diameter is about 30nm.
Embodiment 3
[0053] This comparative example is substantially the same as Example 1, except that the reaction temperature is 40 degrees at room temperature;
[0054] In the magnesium oxide nanomaterial synthesized in this comparative example, its yield is low at first, only about 70% in the example. Contrast with example 1, in the same reaction time, by Figure 7 As can be seen, its intermediate product is different from example 1 ( Figure 7 ), generating basic magnesium carbonate. And in the sample after 800 degree of high temperature roasting, impurity is less, and product purity and crystallinity are high ( Figure 8 ). Referring to the FE-SEM figure ( Figure 9a and Figure 9b ), the intermediate product of the sample was fibrous before roasting, and granular after roasting, with a particle size of about 20nm and good dispersibility.
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