A method for coating the surface of glass hollow microspheres with spinel-type ferrite shells, and the obtained hollow composite microspheres and applications
A technology of glass hollow microspheres and surface coating, which is applied to the surface coating of glass hollow microspheres with spinel-type ferrite shells, ferrite-coated microspheres and application fields, which can solve the problem of low efficiency and a large amount of waste. liquid, unfavorable energy saving and environmental protection, etc., to achieve the effect of short reaction time and high efficiency
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Embodiment 1
[0039] (M x N 1-x O) y · Fe 2 o 3 (x=1, y=1, M is Ni), namely NiFe 2 o 4 Coating of ferrite on the surface of glass hollow microspheres.
[0040] In the first step, ferric nitrate nonahydrate, nickel nitrate hexahydrate, and sucrose are mixed in a molar ratio of 2:1:3 and dissolved in deionized water to obtain 1000 grams of precursor solution A. The amount of water is to ensure the content of precursor A. The amount of water is 50% as the standard.
[0041] In the second step, the density is 0.3g / cm 3 The glass hollow microspheres and precursor solution A were mixed according to the weight ratio of 1:2, and fully stirred to obtain the precursor B.
[0042] In the third step, the newly prepared wet precursor B is directly placed in a high-temperature air environment at 400°C for water evaporation and ignition. The ignited precursor can be taken out and placed at room temperature until the combustion is complete to obtain the product; or ignited Then continue to stay i...
Embodiment 2
[0044] (M x N 1-x O) y · Fe 2 o 3 (x=1, y=1, M is Co), namely CoFe 2 o 4 Coating of ferrite on the surface of glass hollow microspheres.
[0045] In the first step, ferric nitrate nonahydrate, cobalt nitrate hexahydrate, and sucrose were mixed in a molar ratio of 2:1:3 and dissolved in deionized water to obtain 1000 grams of precursor solution A. The amount of water needed to ensure that each component was dissolved The water content of precursor A was 45%.
[0046] In the second step, the density is 0.3g / cm 3 The glass hollow microspheres and precursor solution A were mixed according to the weight ratio of 1:1.5, and fully stirred to obtain the precursor B.
[0047] In the third step, the newly prepared wet precursor B is directly placed in a high-temperature air environment at 600°C for water evaporation and ignition. The ignited precursor can be taken out and placed at room temperature until the combustion is complete to obtain the product; or ignited Then continu...
Embodiment 3
[0049] (M x N 1-x O) y · Fe 2 o 3 (x=1, y=1, M is Ni), namely NiFe 2 o 4 The second round of coating of ferrite on the surface of glass hollow microspheres.
[0050] In the first step, the preparation of precursor solution A is the same as the first step in Example 1.
[0051] In the second step, the glass hollow microspheres / NiFe obtained in Example 1 2 o 4 The hollow composite microspheres were mixed with the precursor solution A at a weight ratio of 1:1, and fully stirred to obtain the precursor B.
[0052] In the third step, the newly prepared wet precursor B is directly placed in a high-temperature air environment at 400°C for water evaporation and ignition. The ignited precursor can be taken out and placed at room temperature until the combustion is complete to obtain the product; or ignited Then continue to stay in the above-mentioned high-temperature environment for 5 minutes and then take it out to obtain the product glass hollow microspheres / NiFe 2 o 4 Ho...
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Abstract
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