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Preparation method and application of illumination time indicating-capable gradient-ramp crack-free gel

A technology of light time and gradient color, which is applied in the field of preparation of gradient color-free gel without cracks, can solve problems such as cracking of gel materials, and achieve the effects of moderate hardness, uniform texture and wide application.

Active Publication Date: 2019-01-08
SHENYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sol-gel method is used to prepare inorganic compounds or inorganic materials. The reaction conditions are warm, so it plays a very important role in the research of chemical material synthesis, but the gel materials prepared by this method are very prone to cracks.

Method used

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  • Preparation method and application of illumination time indicating-capable gradient-ramp crack-free gel
  • Preparation method and application of illumination time indicating-capable gradient-ramp crack-free gel
  • Preparation method and application of illumination time indicating-capable gradient-ramp crack-free gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Comparative Test

[0023] a) Preparation of traditional Gel

[0024] Put 2mL TEOS and 1mL 0.02mol / L HCl into a small beaker and seal it with parafilm. Stir with a magnetic stirrer for three hours at room temperature. Hole, store the sample and observe the phenomenon; through the experimental phenomenon, it is observed that the prepared gel is prone to cracking and bursting into many small fragments.

[0025] Through the analysis, it can be seen that due to the limitations of the organic reaction, the reaction is not complete, and the volatilization of some organic solvents, by-products, water and other substances that did not participate in the reaction causes the gel to crack when the gas escapes, but the main reason is that the prepared gel The glue structure skeleton is unstable and prone to collapse.

[0026] b) Preparation of blue gel (BL / Gel)

[0027] 2mL TEOS, 1mL 0.02mol / L HCl, 1mL 0.001mol / L K 3 Fe(CN) 6 , put it into a small beaker, and seal it with a par...

Embodiment 2

[0041] Effects of different experimental conditions on the preparation of BL-IL / Gel

[0042] a) Effect of pH value on the preparation of BL-IL / Gel

[0043] Prepare a 0.02mol / L HCl solution with a pH of 1.7, and then adjust the pH of the HCl solution to 2.3 and 3.4 with a pH indicator. In three small beakers add 2 mL TEOS, 1 mL 1.0 mM K 3 Fe(CN) 6 and 1mL 1-butyl-3-methylimidazolium tetrafluoroborate, then add 1mL HCl solution with pH of 1.7, 2.3, 3.4 respectively, and seal with parafilm, stir separately at room temperature with a magnetic stirrer Two hours, three hours, five hours, after the stirring is completed, use a thin needle to pierce some small holes on the parafilm, store the samples, and observe the phenomenon.

[0044] The experimental results found that when the hydrochloric acid solution with a pH value of 1.7 was added, a sol would be formed after stirring for two hours; when the pH value of the hydrochloric acid solution was added to 2.3, it would take three ...

Embodiment 3

[0059] Prepare light labels

[0060] Optimize K 3 Fe(CN) 6 Concentration, to prepare light labels for five-day color development

[0061] In this example, 0.5mM K 3 Fe(CN) 6 The color change of the gel under light conditions is an indicator signal, indicating a certain time span.

[0062] Contains 0.5mM K 3 Fe(CN) 6 When BL-IL / Gel is stored under light conditions and the storage time is different, the color that appears is also different. Prepare solution containing 0.5mM K 3 Fe(CN) 6 When BL-IL / Gel was left for one day, two days, or three days, the gel showed no obvious color change. It would appear blue when it was left for four days under light conditions. On the fifth day, the polycondensation discoloration was completely obtained and a uniform blue block without cracks was obtained. According to containing 0.5mM K 3 Fe(CN) 6 BL-IL / Gel develops color in four days and changes color in five days, which can be applied to food light labels to indicate the shelf life...

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Abstract

The invention relates to the technical field of sol-gel, and particularly relates to a preparation method and application of illumination time indicating-capable gradient-ramp crack-free gel. The method specifically comprises the following steps: improving physicochemical properties of gel by adding ionic liquid 1-butyl-3-methylimidazole tetrafluoroborate; preparing gradient-ramp crack-free gel byutilizing light decomposition properties of [Fe(CN)6]<3->; and preparing a novel crack-free sol-gel material having the time-memory function by utilizing the characteristic of color change of iron-cyanide ions under a light condition by changing iron-cyanide ion concentrations so as to indicate the span of lighting time.

Description

technical field [0001] The invention relates to the technical field of sol-gel, in particular to a preparation method and application of a gradient-color crack-free gel that can indicate light time. Background technique [0002] Potassium ferricyanide is an inorganic compound with the chemical formula K 3 [Fe(CN) 6 ]. K 3 [Fe(CN) 6 ] It is very stable at room temperature and is easily decomposed by acid to produce highly toxic potassium cyanide and cyanide. Its aqueous solution is easily decomposed by light and acid / base action, and can be reduced to K by light and reducing agent 4 [Fe(CN) 6 ]. K 4 [Fe(CN) 6 ] encounter iron salt, K 3 [Fe(CN) 6 ] In case of ferrous salt, a blue precipitate (Prussian blue or Teng's blue) can be generated. [0003] Ionic liquids are special high-purity salts composed of organic cations and inorganic anions or organic anions. The asymmetry of the organic functional groups prevents the ions from forming a complete crystal structure. ...

Claims

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Application Information

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IPC IPC(8): B01J13/00C09K9/00G09F3/00
CPCB01J13/0065C09K9/00G09F3/00
Inventor 张玲张谦刘楠朱岩琪矫淞霖张洪波
Owner SHENYANG NORMAL UNIV
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