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A kinetically adjustable color-changing material and its preparation method

A technology of acidity regulator and indicator, which is applied in the field of color-changing indicator technology and related materials, which can solve the problems of poor dynamic adjustable range, single color change, high cost, etc., and achieve the effect of small volume, relatively small volume and low cost

Inactive Publication Date: 2019-08-06
BEIJING LANTSAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of TTI is often limited in its use due to its large size, single color change, poor dynamic adjustable range, and high cost.

Method used

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  • A kinetically adjustable color-changing material and its preparation method
  • A kinetically adjustable color-changing material and its preparation method
  • A kinetically adjustable color-changing material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] Using the following recipe and procedure, a self-evolving color-changing indicator was prepared.

[0132] formula:

[0133]

[0134] Note 1: The standard concentration of gold nanorod solution is prepared by dispersing gold nanorods in cetyltrimethylammonium chloride solution (0.010M), its extinction peaks are at 508nm and 825nm, and the optical density at 508nm 10.000cm -1 , the optical density at 825nm is 44.000cm -1 . The same below.

[0135]Note 2: The standard concentration of silver chloride suspension is obtained by mixing equal masses of cetyltrimethylammonium chloride solution (concentration: 0.116M) and silver nitrate (concentration: 0.100M) solution. The same below.

[0136] operate:

[0137] 1) At a reaction temperature of 35°C, gold nanorod solution (standard concentration, 0.4000g), cetyltrimethylammonium chloride (0.100M, 0.5000g), cetyltrimethylammonium bromide (0.001M, 0.4000g) and ascorbic acid (0.100M, 0.1000g) were fully mixed to obtain a c...

Embodiment 2

[0143] Using the same recipe and operation as in Example 1, the self-evolving color indicator was prepared at a reaction temperature of 5°C.

[0144] Place the prepared self-evolving color indicator in a constant temperature environment at 5°C, and measure its extinction spectrum every 24 hours. The results are as follows: Figure 2A and 2B shown.

[0145] It can be known from the spectral results that, compared with Example 1, when the ambient temperature decreases (from 35° C. to 5° C.), the self-evolving color-changing process of the self-evolving color-changing indicator slows down.

Embodiment 3

[0147] Using the following recipe and the same operation as in Example 1, a self-evolving color indicator was prepared.

[0148] formula:

[0149]

[0150] Place the prepared self-evolving color indicator in a constant temperature environment of 35°C, measure its extinction spectrum every 1.0h, and the results are as follows: Figure 3A and 3B shown.

[0151] It can be seen from the spectral results that, compared with Example 1, when the concentration of ascorbic acid is reduced (the amount used is reduced from 0.1000 g to 0.0500 g), the self-evolving color-changing process of the self-evolving color-changing indicator slows down.

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Abstract

The present invention relates to a self-evolving discoloring indicator, a preparation method therefore and a use method thereof. The self-evolving discoloring indicator comprises the following components: a) a metal nanomaterial, b) water-insoluble silver halide, c) a reducing agent, d) one, two or more cationic surfactants containing halide ions, e) water, and f) an optional acidity regulator.

Description

technical field [0001] The invention relates to a color-changing indicator technology and related materials, in particular to a self-evolving color-changing indicator used to indicate the quality state of perishable products, and a preparation and use method thereof. Background technique [0002] The safety of perishable products such as food and pharmaceuticals has always been the focus of attention. In order to prevent such products from being unsuitable for consumption or unable to achieve their due effects due to microbial reproduction or deterioration of active ingredients, the shelf life (or expiration date, etc.) is usually marked to indicate the time period when it is in the qualified quality stage. However, such shelf life (or expiration date, etc.) is usually estimated based on several oversimplified factors (including certain temperature, humidity, atmosphere, packaging, etc.), and in practice, it is often due to changes in storage conditions, especially temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 张超田子健郭占云
Owner BEIJING LANTSAI TECH CO LTD
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