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Process of preparing nano zinc oxide on SiO2 surface

A nano-zinc oxide and compound technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of agglomeration, complex process, high energy consumption, etc., and achieve the effect of uniform distribution, convenient operation, and large specific surface area

Inactive Publication Date: 2007-06-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] These methods often have disadvantages such as serious agglomeration, high energy consumption, and complicated process. At the same time, these methods do not directly prepare zinc oxide on the existing carrier, and require subsequent composite processes.

Method used

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  • Process of preparing nano zinc oxide on SiO2 surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dissolve NaOH in ethanol to prepare a solution with a concentration of 0.008g / ml. Add 200ml of absolute ethanol and 1.0ml of water into a three-neck flask, add 0.5g of SiO 2 , stirred into a uniform suspension in a constant temperature water bath at 25°C. Add 0.6g of zinc acetate and stir at constant temperature for 6hr. Under the condition of stirring, 15ml NaOH ethanol solution was added dropwise into the three-necked flask at a rate of 1ml / min, and the stirring was continued for 10hr, and then a solid precipitate was obtained by centrifugation. After washing with ethanol several times, the product was obtained by drying. Fig. 1 is the X-ray diffraction pattern of the sample, calculated according to the Scherrer formula, it can be seen that the average particle diameter is 6.7nm. Figure 2 is an electron micrograph of the product, from which it can be seen that ZnO particles are well dispersed on the surface of the networked silica gel.

Embodiment 2

[0017] Dissolve NaOH in methanol to prepare a solution with a concentration of 0.008g / ml. Add 200ml of anhydrous methanol and 1.0ml of water into a three-neck flask, add 0.5g of SiO 2 , stirred into a uniform suspension in a constant temperature water bath at 40°C. Add 0.6g Zn(NO 3 ) 2 , stirring at constant temperature for 6hr. Under stirring conditions, 15ml NaOH methanol solution was added dropwise into the three-necked flask at a rate of 1ml / min, and after stirring for 2hrs, a solid precipitate was obtained by centrifugation. After washing with ethanol several times, the product was obtained by drying. According to X-ray diffraction analysis, according to the Scherrer formula calculation, the average particle diameter is 9.2nm.

Embodiment 3

[0019] Dissolve NaOH in isopropanol to prepare a solution with a concentration of 0.001 g / ml. Add 200ml of anhydrous isopropanol and 2ml of water into a three-neck flask, add 0.5g of SiO 2 , stirred into a homogeneous suspension in a constant temperature water bath at -5°C. Add 0.01g ZnCl 2 , stirring at constant temperature for 48hr. Under stirring conditions, 40ml of NaOH isopropanol solution was added dropwise into the three-necked flask at a rate of 1ml / min, and after stirring for 2hr, solid precipitation was obtained by centrifugation. After washing with ethanol several times, the product was obtained by drying. According to X-ray diffraction analysis, according to Scherrer formula calculation, it can be seen that the average particle diameter is 4.5nm.

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Abstract

A process for preparing zinc oxide nano-particles on the surface of SiO2 includes such steps as preparing the solution of low-grade alcohol, sequentially adding SiO2 and Zn compound while stirring, stirring to obtain a reaction system A, preparing the aqueous solution or alcohol solution of inorganic alkali, dripping it in said reaction system A while stirring, reaction, centrifugal separation, and drying.

Description

technical field [0001] The present invention relates to SiO 2 The invention discloses a method for preparing nanometer zinc oxide on the surface, which belongs to the field of preparation of nanocomposite materials. Background technique [0002] Nano-zinc oxide has many special properties, such as non-migration, fluorescence, piezoelectricity, ability to absorb and scatter ultraviolet rays, etc., and has a wide range of uses in rubber, ceramics, daily chemicals, coatings, and magnetic materials. Utilizing its wonderful properties in light, electricity, magnetism, sensitivity, etc., it can be used to manufacture gas sensors, phosphors, varistors, ultraviolet shielding materials, image recording materials, piezoelectric materials, piezoresistors, efficient catalysts, magnetic materials and plastics film etc. [0003] The preparation methods of nano-zinc oxide preparation technology can be divided into physical methods and chemical methods according to their properties. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02
Inventor 蒋新
Owner ZHEJIANG UNIV