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A method for preparing color-changing sensing material using vermiculite as raw material
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A sensing material, vermiculite technology, applied in the field of color-changing sensing materials prepared from vermiculite, can solve problems such as unclear mechanism, complex sensing phenomena, environmental hazards, etc., achieve short response time, low investment, The effect of using less
Active Publication Date: 2019-07-23
TARIM UNIV
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Problems solved by technology
1) There are few types of existing materials, and it is necessary to develop a variety of new sensing materials
2) Most of the sensing materials are heavy metals or toxic organic substances, which cause great harm to the environment. With the emphasis on environmental protection around the world and the enhancement of people's environmental awareness, it is the general trend to develop environmentally friendly sensors.
3) Sensing phenomena are often very complex, and many mechanisms are still unclear
Method used
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Embodiment 1
[0030] Take 5 grams of raw vermiculite, wash it with water, dry it at 40°C, crush it to 20 meshes, thermally expand it in a muffle furnace at 800°C, and take it out for 5 minutes to dissipate the heat.
[0031]Using tetrahydrofuran as a solvent, prepare 10ml of a 10,12-pentacadiynoic acid solution with a concentration of 2.5mg / mL, and ultrasonicate at 80KHz for 30 minutes to obtain an organic solution for future use.
[0032] Sensing particle preparation: put the prepared expanded vermiculite into the prepared 10,12-pentacosadiynoic acid solution solution, mix well, react at room temperature for 5 minutes, and filter to obtain 10,12-diynoic acid solution Pentadiynoic acid / vermiculite composite granular material.
[0033] Sensing film preparation: the prepared expanded vermiculite was crushed to 120 mesh, in 0.3g / mL sodium chloride solution, the solid-to-liquid ratio was 1:10, and stirred at 600rpm for 7 days, centrifuged to obtain fine-grained vermiculite stone flakes. Wash ...
Embodiment 2
[0038] Take 5 grams of raw vermiculite, wash it with water, dry it at 50°C, crush it to 10 meshes, heat it in a muffle furnace at 850°C, and heat it for 10 minutes, take it out to get the expanded frogstone, and set it aside.
[0039] Using tetrahydrofuran as a solvent, prepare 10ml of 10,12-pentacadiynoic acid solution with a concentration of 2.0 mg / mL, and ultrasonicate at 80KHz for 25 minutes to obtain an organic solution for future use.
[0040] Preparation of sensing particles: put the prepared expanded vermiculite into the prepared 10,12-pentacosadiynoic acid solution solution, mix well, react at room temperature for 10 minutes, and filter to obtain 10,12-diynoic acid solution Pentadiynoic acid / vermiculite composite granular material.
[0041] Sensing film preparation: the prepared expanded vermiculite was crushed to 100 mesh, in 0.3g / mL lithium chloride solution, the solid-to-liquid ratio was 1:10, and stirred at 600rpm for 10 days, centrifuged to obtain fine-grained ve...
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Abstract
The invention provides a method of preparing a novel organic-inorganic composite sensing thermochromic material from vermiculite through supramolecular assembly. The material has a thermochromic function and a VOC gas sensing function. Specifically, vermiculite ores are expanded by microwaves to obtain expanded vermiculite; due to the high thermal stability and strong adsorption performance of vermiculite, expanded vermiculite is taken as the matrix, expanded vermiculite and diacetylenic acid carry out self-assembly to obtain a composite material, and according to the needs, the composite material can be used to prepare a sensing material in the form of particles or films. The sensing material has a sensitive thermochromic function. Through heating and cooling, the reversible circulation between red and orange is realized; for different VOC gases, the sensing material gives off different colors, and the VOC gas sensing is realized. The material has the two functions: thermochromic function and VOC gas sensing function, and the thermochromic function can be repeatedly used in circle. The method takes inorganic vermiculite as the matrix, and prepares a novel material from vermiculite through supramolecular assembly. The novel material has the advantages of simple method, high efficiency, and low cost. The additional value of vermiculite is increased, and vermiculite is applied to industry.
Description
[0001] Technical field: [0002] The invention relates to a method for preparing a color-changing sensing material by using vermiculite as a raw material, in particular to an organic-inorganic composite material, a preparation method thereof and an application of color-changing sensing. [0003] Background technique: [0004] Material science in the 21st century has entered the era of miniaturization, functionalization, integration and intelligence. The combination of inorganic and organic components at the molecular or nanometer level is of great significance for the development of new multifunctional materials. Organic-inorganic composite materials have the dual advantages of both organic and inorganic compounds, such as high strength, thermal stability, and chemical corrosion resistance of inorganic substances, excellent molecular tailoring and modification functions, and multifunctionality of organic substances. The study of new functional supramolecular materials, their ph...
Claims
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