Synthesis process of nanostring and nanopowder of RE hydroxide or oxide

A rare earth hydroxide and rare earth oxide technology, which is applied in the synthesis of rare earth hydroxide or oxide nanowires and their nanoparticles, and the synthesis of rare earth compounds, can solve problems such as preparation method reports, and achieves simple process and cost The effect of low cost and large specific surface area

Inactive Publication Date: 2003-03-19
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, research at home and abroad focuses on the preparation of oxide (Y.Hasegawa et al. Angew.Chem.Int.Ed.2002, 41, 2073.), fluoride (J.W.Stouwdam et al., Nano Lett, 2002, 7, 733) nanoparticles And lanthanide metal-organic compounds (M.C.Cassani etc., J.Organomet.Chem, 2002,647,71.) and other aspects of research, th

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  • Synthesis process of nanostring and nanopowder of RE hydroxide or oxide
  • Synthesis process of nanostring and nanopowder of RE hydroxide or oxide
  • Synthesis process of nanostring and nanopowder of RE hydroxide or oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Weigh 0.001mol of analytically pure lanthanum oxide and place it in a 40ml stainless steel pressure-resistant reactor, dissolve it with a small amount of concentrated nitric acid, then quickly adjust the pH value to 13 with 20% concentrated potassium hydroxide solution, then add deionized water, and The reaction was carried out at 180° C. for 12 hours in the reaction kettle. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a white powder. The product is identified as hexagonal phase lanthanum hydroxide by X-ray powder diffraction; the morphology of the product detected by TEM electron microscope: the diameter is 10-20 nanometers, and the length is 2.5-4.0 microns. Single nanowire electron diffraction proves that the product is a single crystal. Under the same conditions, the reaction temperature is controlled at 100, 120, 160, 200, and 250°C, and within 8 to 24 hours of reaction time, one-dimen...

Embodiment 2

[0037] Weigh 0.0015mol of analytically pure samarium oxide and place it in a 40ml stainless steel pressure-resistant reactor, dissolve it with a small amount of concentrated nitric acid, then quickly adjust the pH value to 9 with 10% concentrated potassium hydroxide solution, then add deionized water, React at 100°C for 24 hours in the reactor. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a white powder. The product is identified as hexagonal phase samarium hydroxide by X-ray powder diffraction; the morphology of the product detected by TEM electron microscope: the diameter is 10-20 nanometers, and the length is 2.5-4.0 microns. Single nanowire electron diffraction proves that the product is a single crystal. Under the same conditions, the reaction temperature is controlled at 120°C, 160°C, 180°C, 200°C, 250°C, and one-dimensional single-crystal nanowires of samarium hydroxide can be obtained with...

Embodiment 3

[0039] Weigh 0.0005mol of analytically pure gadolinium oxide and place it in a 40ml stainless steel pressure-resistant reactor, dissolve it with a small amount of concentrated nitric acid, then quickly adjust the pH value to 14 with 20% concentrated potassium hydroxide solution, then add deionized water, and React at 180°C for 15 hours in a closed reactor. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a white powder. The product is identified as hexagonal gadolinium hydroxide by X-ray powder diffraction; the morphology of the product detected by TEM electron microscope: the diameter is 10-20 nanometers, and the length is 2.5-3.0 microns. Single nanowire electron diffraction proves that the product is a single crystal. Under the same conditions, the reaction temperature is controlled at 100, 120, 160, 200, and 250°C, and within 8 to 24 hours of reaction time, one-dimensional single-crystal nanowires...

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Abstract

Rare earth oxide material is dissolved in dense nitric acid, titrated with potassium hydroxide and made to pass through hydrothermal reaction at 100-250 deg.c inside one sealed container, so that monocrystal nanostring of RE hydroxide may be prepared. When the hydroxide is used as precursor, and through annealing at 400-500 deg.c, corresponding Re oxide nanostring may be prepared; and the hydroxide may be calcined at certain temperature to produce corresponding RE oxide nanopowder. When some other RE is doped, composite RE hydroxide, RE oxide nanostring or nanopowder may be prepared. The nanopowder has great specific surface area and the nanostring is anisotropic, so that they may find wide application in various fields.

Description

technical field [0001] The invention relates to a synthesis method of rare earth compounds, in particular to a synthesis method of rare earth hydroxide or oxide nanowires and nanoparticles thereof, and belongs to the technical field of inorganic chemical industry. Background technique [0002] Rare earth compounds are widely used in displays, catalysis, biological probes and other fields due to their unique optical and magnetic properties. Existing methods for synthesizing rare earth compounds are limited to the generation of bulk materials. At present, research at home and abroad focuses on the preparation of oxide (Y.Hasegawa et al. Angew.Chem.Int.Ed.2002, 41, 2073.), fluoride (J.W.Stouwdam et al., Nano Lett, 2002, 7, 733) nanoparticles And lanthanide metal-organic compounds (M.C.Cassani etc., J.Organomet.Chem, 2002,647,71.) and other aspects of research, the inventor once reported on the American Journal of Inorganic Chemistry in 2000 to prepare sulfur with solvothermal ...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 李亚栋王训
Owner TSINGHUA UNIV
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