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Method for preparing flower-like crystalline magnesium hydroxide film in microcosmic appearance

A technology of magnesium hydroxide and microscopic morphology, applied in electrolysis process, electrolysis components, etc., to achieve the effect of short time, low temperature and energy saving

Inactive Publication Date: 2009-10-07
ZHEJIANG 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 direct preparation of magnesium hydroxide films containing flower-like crystals with microscopic morphology by electrochemical cathodic deposition.

Method used

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  • Method for preparing flower-like crystalline magnesium hydroxide film in microcosmic appearance
  • Method for preparing flower-like crystalline magnesium hydroxide film in microcosmic appearance
  • Method for preparing flower-like crystalline magnesium hydroxide film in microcosmic appearance

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Experimental program
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Effect test

Embodiment 1

[0036] A traditional glass electrolytic cell was used, with ITO as the cathode, a platinum electrode as the counter electrode, and a saturated calomel electrode (SCE) as the reference electrode. The electrolyte solution is an aqueous solution of 0.1mol / L magnesium nitrate and 0.2mol / L sodium acetate, the cathode potential is at -1.5V (relative to SCE), the time is 2 hours, room temperature. As a comparison, a magnesium nitrate solution without sodium acetate was used as the electrolyte, that is, a 0.1mol / L magnesium nitrate aqueous solution, and other conditions were the same. The prepared magnesium hydroxide thin film was characterized by XRD and SEM.

[0037] Characterization result shows the diffraction peak of the XRD of the film prepared (see figure 1 ) is consistent with the standard magnesium hydroxide diffraction card, indicating that both are magnesium hydroxide films. But the SEM results (see figure 2 ) shows the film prepared by cathode electrodeposition from th...

Embodiment 2

[0039] A traditional glass electrolytic cell was used, with ITO as the cathode, a platinum electrode as the counter electrode, and a saturated calomel electrode (SCE) as the reference electrode. The electrolyte solution is an aqueous solution of 0.1mol / L magnesium nitrate and 0.025mol / L sodium acetate, the cathode potential is at -1.5V (relative to SCE), the time is 2 hours, room temperature.

[0040] XRD characterization results show that the prepared film is magnesium hydroxide film. SEM results (see image 3 ) shows that the magnesium hydroxide film is composed of magnesium hydroxide with flower-like crystal shape and porous network magnesium hydroxide, wherein the proportion of magnesium hydroxide with flower-like crystal shape in the film is about 5-7%.

Embodiment 3

[0042] A traditional glass electrolytic cell was used, with ITO as the cathode, a platinum electrode as the counter electrode, and a saturated calomel electrode (SCE) as the reference electrode. The electrolyte solution is an aqueous solution of 0.1mol / L magnesium nitrate and 0.1mol / L sodium acetate, the cathode potential is -1.5V (relative to SCE), the time is 2 hours, room temperature.

[0043] XRD characterization results showed that the films prepared by cathodic electrodeposition were all magnesium hydroxide films. SEM results (see Figure 4 ) shows that the magnesium hydroxide film is composed of magnesium hydroxide with flower-like crystal shape and porous network magnesium hydroxide, wherein the proportion of magnesium hydroxide with flower-like crystal shape in the film is about 40-60%.

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Abstract

The invention discloses a preparation method of a magnesium hydroxide film containing flower-like crystals in microscopic appearance. It uses ionic liquid as an additive, and the electrolytic solution is an aqueous solution of magnesium nitrate and sodium acetate, and a cathodic electrodeposition method is used to prepare a nano-flower-shaped magnesium hydroxide film. The concentration of magnesium nitrate in the electrolyte is 0.1-0.2 mol / L, and the concentration of sodium acetate is 0.025-0.2 mol / L. By changing the concentration of sodium acetate in the electrolyte, the proportion of magnesium hydroxide with a microscopic appearance of flower-like crystals in the film is between 5% and 100%. The preparation method of the invention has the advantages of convenient operation, energy saving and being able to be carried out at room temperature.

Description

technical field [0001] The invention relates to a preparation method of a nano film, in particular to a preparation method of a magnesium hydroxide film containing a flower-like crystal in microscopic appearance. Background technique [0002] Magnesium hydroxide is a flaky crystal of the hexagonal system, an inorganic weak base product, insoluble in water, but soluble in strong acidic solutions. Magnesium hydroxide has many excellent properties such as high activity and adsorption capacity, safe use, non-corrosive, non-toxic and harmless, etc., as an "environmentally friendly flame retardant", "green, safe and mild neutralizer" and adsorption Agents have a wide range of applications. [0003] Magnesium hydroxide is a new type of inorganic flame retardant developed in recent years. It has the advantages of good thermal stability, no pollution, and good smoke suppression effect. Compared with other similar inorganic flame retardants, it has better smoke suppression effect. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/20
Inventor 陈卫祥邹光龙马琳李辉
Owner ZHEJIANG UNIV
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