Method for preparing blue cobalt aluminate by sol gel method

A sol-gel method, aluminum spinel technology, applied in chemical instruments and methods, cobalt compounds, nanotechnology for materials and surface science, etc., can solve the reduction of powder specific surface area, stoichiometric ratio deviation, application Due to the limited field and other problems, the effects of high material strength and toughness, positive product color, and wide doping range are achieved.

Inactive Publication Date: 2018-11-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solid-phase reaction depends on diffusion kinetics to complete, the reaction time is long, the reaction is not uniform and the particle size is generally micron; the high calcination temperature will cause the volatilization of some components, resulting in the deviation of the final stoichiometric ratio of the reactants, and Easy to form local sintering, so that the specific surface area of ​​the powder is reduced
Generally, the specific surface area of ​​the powder prepared by the solid phase method is 1-5m 2 g -1 ([2] C.Oter M. Mentruit, etal. (Material Science) Mater. Lett.39 (1999) 22-27) has limited application fields and can only be used as a ceramic grade pigment
However, there is no report on the preparation of cobalt-aluminum spinel by sol-gel method

Method used

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  • Method for preparing blue cobalt aluminate by sol gel method
  • Method for preparing blue cobalt aluminate by sol gel method
  • Method for preparing blue cobalt aluminate by sol gel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using aluminum chloride and cobalt chloride as raw materials, according to Co 2+ :Al 3+ Molar ratio=1:4 batching, specific operation steps are as follows: respectively dissolve aluminum chloride, cobalt chloride in deionized water, make solution, wherein the concentration of aluminum chloride solution is 0.2mol / L, the concentration of cobalt chloride solution The concentration is 0.2mol / L. After mixing, a sol is formed and kept stirring. Adjust the pH to 5 with oxalic acid solution. After stirring fully, let the solution stand for 12 hours to precipitate, centrifuge (suction filtration), wash and dry. The above powder was heat-treated in a muffle furnace at 1000°C for 2 hours to obtain the final sample. Its XRD pattern is as figure 2 ,From figure 2 Clear CoAl can be seen in 2 o 4 The diffraction peaks correspond to (220), (311), (400), (422), (511) and (440) crystal planes in (PDF 44-0160), which proves that CoAl 2 o 4 Powder. . Its TEM pictures are as Figu...

Embodiment 2

[0048] Using aluminum chloride and cobalt chloride as raw materials, according to Co 2+ :Al 3+ Molar ratio=1:2 batching, specific operation steps are as follows: respectively dissolve aluminum chloride, cobalt chloride in deionized water, make solution, wherein the concentration of aluminum chloride solution is 0.3mol / L, the concentration of cobalt chloride solution The concentration is 0.3mol / L. After mixing, a sol is formed and kept stirring. Adjust the pH to 4 with oxalic acid solution. After stirring fully, let the solution stand for 24 hours to precipitate, centrifuge (suction filtration), wash and dry. The above powder was heat-treated in a muffle furnace at 1200°C for 3 hours to obtain the final sample. Its XRD pattern is as image 3 ,From image 3 Clear CoAl can be seen in 2 o 4 The diffraction peaks correspond to (220), (311), (400), (422), (511) and (440) crystal planes in (PDF 44-0160), respectively, and the peaks are strong and sharp, indicating that the obtai...

Embodiment 3

[0050] Using aluminum sulfate and cobalt sulfate as raw materials, according to Co 2+ :Al 3+ Molar ratio=1:2 ingredients, the specific operation steps are as follows: respectively dissolve aluminum sulfate and cobalt sulfate in deionized water to make a solution, wherein the concentration of aluminum sulfate solution is 0.2mol / L, and the concentration of cobalt sulfate solution is 0.2mol / L, form a sol after mixing and keep stirring, adjust the pH to 6 with oxalic acid solution, after stirring fully, let the solution stand for 18 hours to precipitate, centrifuge (suction filtration) wash, and dry. The above powder was heat-treated in a muffle furnace at 800 °C for 5 h to obtain the final sample. Its XRD pattern is as Figure 4 ,From Figure 4 Clear CoAl can be seen in 2 o 4 The diffraction peaks correspond to (220), (311), (400), (422), (511) and (440) crystal planes in (PDF 44-0160), respectively, and the peaks are strong and sharp, indicating that the obtained CoAl 2 o...

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Abstract

The invention relates to a method for preparing blue cobalt aluminate by a sol gel method. The method comprises the following steps: preparing water solution containing soluble cobalt salt and solublealuminum salt, wherein a mole ratio of Co and Al is 1:(2-4); stirring the obtained water solution and adjusting a pH value to 3-6, forming gel; after adequately stirring the obtained gel, stewing, separating a solid, washing and drying, calcining for 2-5 hours in 800-1200 DEG C, to obtain the blue cobalt aluminate. The method is capable of using a wet chemistry method, uniformly mixing precursors(metal inorganic salt, a solvent and the like) in a liquid state condition, and through chemical reactions, such as hydrolysis, polycondensation (condensation), of metal salts, forming a stable transparent sol system in a solution form.

Description

technical field [0001] The present invention is about nanometer CoAl 2 o 4 The method for synthesizing the powder, in particular relates to the preparation of a precursor solution by a gel method, and belongs to the field of preparation of nano pigments. Background technique [0002] Cobalt blue is a very old pigment. Thenard made this kind of blue pigment at the end of the 18th century, so it is still called Thenard’s blue in foreign countries. It was only used as an art paint at that time. [0003] The main components of cobalt blue are CoO, Al 2 o 3 , or cobalt aluminate (CoAl 2 o 4 ). Cobalt blue pigment has bright color, good weather resistance, acid and alkali resistance, strong resistance to various solvents, and heat resistance up to 1200°C. It has been widely used in plastics, coatings, fibers, paper, rubber colored glass, Cement and ceramic bodies ([1] W.Li, J.Li, J.Guo, (Journal of the European Ceramic Society) J.Eur.Ceram.Soc.23(2003)2289–2295). Cobalt al...

Claims

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Application Information

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IPC IPC(8): C01G51/00B82Y30/00
CPCB82Y30/00C01G51/00C01P2002/72C01P2004/04C01P2004/64
Inventor 高彦峰邸雪余子涯窦维维陈长
Owner SHANGHAI UNIV
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