Photochromic niobium pentoxide and preparation method thereof

A niobium pentoxide and photochromic technology, applied in the field of photochromic materials and their preparation, can solve the problem that the photochromic performance of niobium pentoxide has a great influence on the preparation process, and the process conditions of niobium pentoxide have not been discussed in depth. problem, to achieve the effect of good reversible repeatability, fast response and recovery speed, and process safety

Active Publication Date: 2015-05-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yao Jiannian prepared a photochromic niobium pentoxide thin film by vacuum thermal evaporation, but this article mainly reports the photochromic phenomenon of niobium pentoxide thin film, which affects the photochromic effect of niobium pentoxide The process conditions have not been discussed in depth. In our long-term research, we found that not all niobium pentoxide materials have photochromic properties, and found that the photochromic properties of niobium pentoxide are greatly affected by the preparation process.

Method used

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  • Photochromic niobium pentoxide and preparation method thereof
  • Photochromic niobium pentoxide and preparation method thereof
  • Photochromic niobium pentoxide and preparation method thereof

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Embodiment 1

[0015] 1) Prepare ammonium oxalate solution: Take 20ml of deionized water and add it to a beaker, put the beaker into a water bath, heat at 60°C, weigh 2.48g of ammonium oxalate into deionized water, stir mechanically until the solution is clear, then make oxalic acid ammonium solution.

[0016] 2) Preparation of ammonium niobium oxalate solution: Weigh 3.76 g of niobium pentafluoride and add it to the ammonium oxalate solution prepared in step 1), to obtain ammonium niobium oxalate solution.

[0017] 3) Add ammonia water dropwise to the ammonium niobium oxalate solution prepared in step 2) using a rubber dropper to start to produce white precipitates. When the pH value of the solution is 11, the reaction is complete. Put the fully reacted solution in an oven to age and precipitate. The heating temperature is 80° C., and the aging time is 12 hours.

[0018] 4) Filter the white precipitate aged in step 3), and wash it repeatedly with ultrapure water to remove fluoride ions. T...

Embodiment 2

[0022] 1) Prepare ammonium oxalate solution: Take 30ml of deionized water and add it to a beaker, put the beaker into a water bath, heat at 70°C, weigh 4.96g of ammonium oxalate into deionized water, and stir mechanically until the solution is clear to make oxalic acid ammonium solution.

[0023] 2) Preparation of ammonium niobium oxalate solution: Weigh 7.52 g of niobium pentafluoride and add it to the ammonium oxalate solution prepared in step 1), to obtain ammonium niobium oxalate solution.

[0024] 3) Add ammonia water dropwise to the ammonium niobium oxalate solution prepared in step 2) using a rubber dropper to start to produce white precipitates. When the pH value of the solution is 11, the reaction is complete. Put the fully reacted solution in an oven to age and precipitate. The heating temperature was 80° C., and the aging time was 16 hours.

[0025] 4) Filter the white precipitate aged in step 3), and wash it repeatedly with ultrapure water to remove fluoride ions....

Embodiment 3

[0029] 1) Prepare ammonium oxalate solution: Take 40ml of deionized water and add it to a beaker, put the beaker into a water bath, heat at 80°C, weigh 8.07g of ammonium oxalate into deionized water, stir mechanically until the solution is clear, then make oxalic acid ammonium solution.

[0030] 2) Preparation of ammonium niobium oxalate solution: Weigh 12.22 g of niobium pentafluoride and add it to the ammonium oxalate solution prepared in step 1), to obtain ammonium niobium oxalate solution.

[0031] 3) Add ammonia water dropwise to the ammonium niobium oxalate solution prepared in step 2) using a rubber dropper to start to produce white precipitates. When the pH value of the solution is 11, the reaction is complete. Put the fully reacted solution in an oven to age and precipitate. The heating temperature is 80° C., and the aging time is 18 hours.

[0032] 4) Filter the white precipitate aged in step 3), and wash it repeatedly with ultrapure water to remove fluoride ions. ...

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Abstract

The invention provides a photochromic niobium pentoxide and a preparation method thereof. The preparation method of the photochromic niobium pentoxide comprises the following steps: preparing an ammonium oxalate solution, preparing an ammonium niobium oxalate solution, adding ammonia water to the ammonium niobium oxalate solution in a dropwise manner for reacting to generate a white precipitate, ageing the precipitate in an oven, filtering the aged precipitate, cleaning the filtered precipitate with ultrapure water to remove fluoride ions, drying in the oven, and calcining the precipitate to obtain the photochromic niobium pentoxide material. The method has the advantages of simple operation, time saving and low apparatus conditions.

Description

technical field [0001] The invention relates to a chemical material, in particular to a photochromic material and a preparation method thereof. Background technique [0002] Photochromic materials are a very important class of smart materials, and they have a wide range of applications in color-changing glasses, optical information storage, and photomolecular switches. Photochromic materials are divided into organic photochromic materials and inorganic photochromic materials. Inorganic photochromic materials have long been favored for their excellent photoelectromagnetic properties. Among them, transition metal oxides have good optical contrast properties and environmental stability. Sex is considered to be the most promising photochromic material. At present, more photochromic transition metal oxides mainly include MoO 3 、WO 3 , V 2 o 5 and its composite materials. In addition, inorganic photochromic materials are also one of the foundations for the development of pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00C01G33/00
Inventor 李垚潘磊赵九蓬马丽华孙运勇
Owner HARBIN INST OF TECH
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