Novel method for in situ preparing nano-zinc borate crystal whisker in normal pressure normal pressure liquid phase

A nano-zinc borate, in-situ preparation technology, applied in chemical instruments and methods, solutions from room temperature liquid solvents, single crystal growth, etc. Complex operation and other problems, to achieve high economic value and social value, improve market competitiveness, simple preparation process effect

Inactive Publication Date: 2008-11-05
JILIN UNIV
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AI-Extracted Technical Summary

Problems solved by technology

[0004] Some whisker preparation methods in China mainly include hydrothermal method and solid-phase method, both of which have limitations. The former has higher requirements for experimental equipment, and needs to use a reactor to complete the experiment, and the output is low. It is complex and virtually increases the cost; while the latter requires high-temperature calcination, which will inevitably increase the particle size of the product, and the high-temperature calcination consumes a lot of energy, the production cycle is long, and the use of fl...
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Abstract

The invention relates to a liquidoid in situ method for preparing a nano zinc borate crystal whisker under normal pressure and low temperature, which comprises following steps: 50 milliliter of a borax solution with the concentration of 0.05 to 0.2 mol per liter is placed into a three-necked bottle, an aqueous solution of a cation surfactant is added and agitated evenly, 10 milliliter of a zinc salt with the concentration of 1 to 2 mol per liter is then added, temperature is heated until 50 to 90 DEG C, and crystallization is implemented by 7 to 10 hours of agitation at constant temperature; a white deposition that is obtained is filtered, washed and dried at the temperature of 50 to 90 DEG C, thus obtaining powder of the nano zinc borate crystal whisker with the diameter of 20 nm to 40 nm, the length of 500 nm to 1 um and the slenderness ratio of 25 to 50. The liquidoid in situ method for preparing the nano zinc borate crystal whisker is characterized in that the method has simple preparation techniques, does not use a fluxing agent and a high-pressure reaction kettle, does not need high-temperature calcinations, does not generate pollution, and has low cost, high productivity and higher economical and social values.

Application Domain

Polycrystalline material growthFrom normal temperature solutions +1

Technology Topic

SURFACTANT BLENDCrystal +11

Examples

  • Experimental program(7)

Example Embodiment

[0010] Example 1:
[0011] 1. Add 50ml of Na with a molar content of 0.1mol/l to a three-necked bottle 2 B 4 O 7 ·10H 2 Put O in a 70℃ water bath;
[0012] 2. Under stirring, add 10ml 2mol/l Zn(NO 3 ) 2 ·6H 2 O solution;
[0013] 3. Adjust the pH value of the solution with alkali;
[0014] 4. Keep the temperature and continue to stir for 7h;
[0015] 5. Filter and wash the above-mentioned precipitate;
[0016] 6. Dehydrate and dry at 60°C, and obtain zinc borate crystal powder with irregular morphology after grinding.

Example Embodiment

[0017] Example 2:
[0018] 1. Add 50ml of Na with a molar content of 0.1mol/l to a three-necked bottle 2 B 4 O 7 ·10H 2 Put O in a 50℃ water bath, add cationic surfactant and stir evenly.
[0019] 2. Under stirring, add 10ml 2mol/l Zn(NO 3 ) 2 ·6H 2 O solution;
[0020] 3. Adjust the pH value of the solution with alkali;
[0021] 4. Keep the temperature and continue to stir for 7h;
[0022] 5. Filter and wash the above-mentioned precipitate;
[0023] 6. Dehydrate and dry at 60°C, and obtain flake zinc borate crystal powder after grinding.

Example Embodiment

[0024] Example 3:
[0025] 1. Add 50ml of Na with a molar content of 0.1mol/l to a three-necked bottle 2 B 4 O 7 ·10H 2 Put O into a 70℃ water bath, add cationic surfactant and stir evenly.
[0026] 2. Under stirring, add 10ml 2mol/l Zn(NO 3 ) 2 ·6H 2 O solution;
[0027] 3. Adjust the pH value of the solution with alkali;
[0028] 4. Keep the temperature and continue to stir for 7h;
[0029] 5. Filter and wash the above-mentioned precipitate;
[0030] 6. Dehydrate and dry at 60°C, and obtain nano-zinc borate whisker powder with a diameter of 20nm-40nm, a length of 500nm-1μm, and an aspect ratio of 25-50 after grinding.

PUM

PropertyMeasurementUnit
Diameter20.0 ~ 40.0nm
Length500.0nm
Aspect ratio1.0 ~ 50.0

Description & Claims & Application Information

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