Process for preparing tungstate nano film

A technology of nano-film and tungstate, applied in the field of preparation of tungstate nano-film, can solve the problems such as the preparation of tungstate nano-film which has not yet been seen, and achieve the effects of easy construction, convenient and concise product processing, and simple method.

Inactive Publication Date: 2005-11-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no report on the preparation of tungstate nano-films with reverse micelles, and among the many preparation methods of nano-films, it is the first time that collodion is used as a dispersant and film-forming agent to prepare nano-films.

Method used

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  • Process for preparing tungstate nano film
  • Process for preparing tungstate nano film
  • Process for preparing tungstate nano film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the first step, weigh 0.020mol lead acetate (analytical pure), and the tungsten source is 0.020mol sodium tungstate (analytical pure). Dissolve them in 50mL distilled water respectively to form two 0.4mol / L solutions.

[0024] Step 2: Add 28 mL of cyclohexane, 3 mL of Tween-80 and 1 mL of 0.4 mol / L metal salt solution prepared in the first step into the Erlenmeyer flask in sequence. Stir thoroughly at a speed of 3000 rpm, then add 1 mL of amyl alcohol each, and stir for about 15 minutes until the reversed micellar solution becomes clear to obtain a metal salt micellar solution. Using the tungsten source solution prepared in the first step instead of the metal salt solution, the same method was used to obtain the tungsten source micellar solution. Then the prepared two micellar solutions were mixed rapidly, and stirred at room temperature for 5 minutes to make them evenly mixed. After 12 hours of reaction, acetone was added to break the emulsion. Use a centrifuge t...

Embodiment 2

[0029] Comparative example without adding collodion. Other conditions and steps are exactly the same as in Example 1, and the product obtained is peanut-shaped PbWO 4 nano film. Scanning electron microscopy (SEM) observations of the product showed that the prepared PbWO 4 The dispersion of the nano film is very uneven, the density is low, and its shape is peanut-like, about 300nm long and 180nm in diameter. The PbWO 4 The nano-film is tetragonal tungstenite, and its luminescence performance is obviously inferior to that of PbWO 4 nano film.

Embodiment 3

[0031] Replace 0.020mol lead acetate with 0.020mol barium acetate, other conditions and steps are exactly the same as in Example 1, the product obtained is a highly dense rod-shaped barium tungstate nanofilm, the diameter of the nanorod is 50nm, and the length is about 180nm. And the length and thickness of the rods are relatively uniform. The rod-shaped nano film is tetragonal tungstenite, the product has high purity, good crystallinity and optical properties.

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Abstract

A process for preparing the tungstate nanofilm includes such steps as preparing the solutions of metal salt and tungsten source, sequential adding cyclohexane and tween-80, stirring, adding pentanol, stirring, quickly mixing both together, stirring, laying aside for 1 2hr, adding acetone for elemulsifying, centrifugal separation of deposit, washing deposit by absolute alcohol, acetone and distilled water sequentially, storing in absolute alcohol, removing supernatant, stirring, adding collodion, stirring, immersing glass substrate in it, pulling it up at 35 mm/min, drying in air, putting it in muffle furnace, holding temp at 200 deg.C for 30 min and than at 500 deg.C for /hr, and annealing.

Description

technical field [0001] The invention relates to a preparation method of a tungstate nano film. Specifically, it adopts reverse micelle method and impregnation-lifting technology, and uses collodion as dispersant and film-forming agent under high temperature conditions to control the synthesis and preparation of tungstate nano-films. Background technique [0002] In recent years, tungstate nanomaterials have broad application prospects in optics, electronics, biology, coatings, medicine and other industries due to their unique photoelectric properties and structural characteristics, which have attracted people's attention and set off a wide research boom. Many scientific studies have confirmed that when normal substances are processed to extremely small scales, their optical, thermal, electrical, magnetic, mechanical and even chemical properties will also undergo correspondingly significant changes. Due to its inherent smaller particle size and lower lateral scattering, inor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495
Inventor 贾润萍吴庆生张国欣丁亚平
Owner TONGJI UNIV
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