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Hydrotalcite with photochromic characteristic and its prepn process

A photochromic and hydrotalcite technology, applied in the field of hydrotalcite, achieves the effects of pollution-free preparation, simple process and low cost

Inactive Publication Date: 2006-08-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is: the hydrotalcite in this material is only used as a solid medium to improve the organic photochromic material, and it does not participate in photochromicity in nature, and is affected by the photosensitivity of the intercalation guest itself, the charged and The influence of factors such as ionic configuration
GianniA.Caravaggio, Christian Detellier and Zbigniew Wronski, J.Mater.Chem., 2001, 11, 912, used the co-precipitation method to synthesize nickel-aluminum nitrate hydrotalcites with different nickel-aluminum ratios and studied its potential as battery cathode materials Electrochemical properties, but not related to photochromic properties

Method used

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  • Hydrotalcite with photochromic characteristic and its prepn process
  • Hydrotalcite with photochromic characteristic and its prepn process
  • Hydrotalcite with photochromic characteristic and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step A: 21.76g (0.1mol) of solid Ni(NO 3 ) 2 ·6H 2 O and 14g (0.05mol) of solid Al(NO 3 ) 3 9H 2 O was dissolved in 100ml of water.

[0037] Step B: Dissolve 12g NaOH in 100ml water to prepare a 3.0M alkaline solution.

[0038] Step C: While vigorously stirring, slowly add the alkali solution to the salt solution dropwise, adjust the pH=6 to complete the dropwise addition, crystallize at 70°C for 24h, filter and wash until the pH value is about 7, and dry at 70°C for 24h to obtain nickel Aluminum nitrate-type hydrotalcite material.

[0039] By XRD spectrum ( figure 1 ), IR spectrum and elemental analysis show that the interlayer anions of the obtained hydrotalcite are all nitrate, which is a LDHs material with a single crystal phase and a consistent structure. Its chemical formula / composition is: [Ni 0.643 al 0.357 (OH) 2 ](NO 3 - ) 0.357 0.7H 2 O.

[0040] The LDHs was irradiated under a 500W high-pressure xenon lamp for 20 minutes, and its color change...

Embodiment 2

[0042] Step A: 3.56g NiCl2 ·6H 2 O and 1.81 g AlCl 3 9H 2 O was dissolved in 25ml of water.

[0043] Step B: Dissolve a certain amount of p-nitrobenzoic acid (1.8g) and 6.2g NaOH in 100ml water to form a mixed alkali solution.

[0044] Step C: While stirring vigorously, slowly add the salt solution dropwise to the mixed alkali solution, adjust the pH=9 to complete the dropwise addition, crystallize at 70°C for 24h, filter, wash until the pH value is about 7, and dry at 70°C for 24h to obtain p-Nitrobenzoic acid intercalation nickel aluminum hydrotalcite material.

[0045] By XRD spectrum ( image 3 ), IR spectrum and elemental analysis, it can be seen that the interlayer anions of the obtained hydrotalcite are all p-nitrobenzoate, which is a LDHs material with a single crystal phase and a consistent structure. Its chemical formula / composition is: [Ni 0.655 al 0.345 (OH) 2 ](C 7 h 4 NO 4 - ) 0.345 0.7H 2 O.

[0046] The LDHs was irradiated under a 500W high-press...

Embodiment 3

[0048] Step A: 3.56g NiCl 2 ·6H 2 O and 1.81 g AlCl 3 9H 2 O was dissolved in 25ml of water.

[0049] Step B: Dissolve a certain amount of m-nitrobenzoic acid (1.8g) and 6.2g NaOH in 100ml water to form a mixed alkali solution.

[0050] Step C: While stirring vigorously, slowly add the salt solution dropwise to the mixed alkali solution, adjust the pH=9 to complete the dropwise addition, crystallize at 70°C for 24h, filter, wash until the pH value is about 7, and dry at 70°C for 24h to obtain Intercalation of nickel-aluminum hydrotalcite materials with m-nitrobenzoic acid.

[0051] From the XRD spectrum, IR spectrum and elemental analysis, it can be seen that the interlayer anions of the obtained hydrotalcite are all m-nitrobenzoate, which is a LDHs material with a single crystal phase and a consistent structure. Its chemical formula / composition is: [Ni 0.671 al 0.329 (OH) 2 ](C 7 h 4 NO 4 - ) 0.329 0.8H 2 O.

[0052] The LDHs was irradiated under a 500W high-pr...

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Abstract

The present invention provides one kind of hydraotalcite with photochromic characteristic and its preparation process, and belongs to the field of hydraotalcite preparing technology. The hydraotalcite has crystal structure and chemical expression of [(M2+)1-x(M3+)x(OH)2]x+(An-)x / n.mH2O, where x is 0.1-0.33, m=3-6 is interlayer crystallized water molecule number, M2+ expresses bivalent metal ion Ni, Co or Fe, M3+ expresses trivalent metal ion Co, Fe, Al or Ga, and An- is anion nitrate radical, p-nitrobenzoate radical, m-nitrobenzoate radical, p-aminobenzoate radical, p-aminobenzene sulfonate radical or chlorobenzoate radical. The present invention has the advantages of synthesis of hydraotalcite with photochromic characteristic for the first time, simple preparation process, low cost and easy reaction.

Description

[0001] Field [0002] The invention belongs to the technical field of hydrotalcite, and in particular provides a hydrotalcite with photochromic properties and a preparation method thereof. Background technique [0003] Literature H.Tagaya, S.Sato, T.Kuwahara, J.Kadokawa, K.Masa and K.Chiba, J.Mater.Chem., 1994, 4, 1907 and T.Kuwahara, H.Tagaya and K.Chiba, MicroporousMater.1995, 4, 247, all adopt ion exchange method, take magnesium aluminum hydrotalcite as the main body, introduce organic photochromic species into the interlayer, and prepare inorganic-organic hybrid photochromic materials. The disadvantage of this method is: the hydrotalcite in this material is only used as a solid medium to improve the organic photochromic material, and it does not participate in photochromicity in nature, and is affected by the photosensitivity of the intercalation guest itself, the charged and ionic configuration and other factors. [0004] Since 1975 (S.Miyata, Clays and Clay minerals, 1...

Claims

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Application Information

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IPC IPC(8): C01G1/02C09K9/00
Inventor 段雪卫敏徐向宇李峰张慧
Owner BEIJING UNIV OF CHEM TECH
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