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Method for immobilizing indicator using porous silica gel material, gas sensor and application

A technology of gas sensor and porous silica gel, which is applied in the direction of material analysis through observation of the influence of chemical indicators, analysis of materials through chemical reactions, and analysis of materials. It can solve problems such as small specific surface area and unfavorable applications, and achieve Effect of increasing specific surface area, reducing production cost, and increasing sensitivity

Active Publication Date: 2020-09-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the indicator is generally precipitated as crystals, and its specific surface area is actually relatively small, which is not conducive to its application in gas detection.

Method used

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  • Method for immobilizing indicator using porous silica gel material, gas sensor and application
  • Method for immobilizing indicator using porous silica gel material, gas sensor and application
  • Method for immobilizing indicator using porous silica gel material, gas sensor and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take by weighing 6 parts of cadmium porphyrin indicators that are respectively 4 mg in weight, and then use 1 mL of ethanol, chloroform, tetrahydrofuran, silica gel sol gel (n-octane triethoxysilane: ethylene glycol methyl ether: propylene glycol methyl ether acetate : tetrahydrofuran: 0.2M hydrochloric acid: Tween 20: water mixed at a volume ratio of 1:4.2:3.5:0.8:0.6:0.01:0.6, hydrolyzed at 65°C for 6 hours to obtain the first silica gel sol-gel solution;), polyvinyl chloride (Polyvinyl chloride: tetrahydrofuran at a mass ratio of 1:25) and polyvinyl alcohol (polyvinyl alcohol: water at a mass ratio of 1:30) were ultrasonically dissolved, and then pipette 1 microliter of the above solution, and drop-coated on the 0.22 Micron cellulose acetate film, after drying, use an optical microscope to observe the situation of cadmium porphyrin dissolved by different methods on the substrate and take pictures. For details of the pictures obtained by using the microscope, see figu...

Embodiment 2

[0032] Take the sensor obtained by dissolving the cadmium porphyrin indicator in different solvents and immobilizing it on the cellulose acetate film in Example 1. Use a mobile phone or camera to take pictures to obtain its initial color picture, and then put it into ammonia gas at the same time Put it in a closed container with a concentration of 50ppm, take it out after 2 minutes, and take pictures with a mobile phone or a camera again to obtain the color picture of the sensor after ammonia reaction; Digitize, extract the digitized red, green and blue (RGB) values, and subtract the obtained RGB values ​​respectively, so as to obtain the color change values ​​△R, △G, △B before and after the reaction, and then use the formula Calculate the color change value before and after reacting with ammonia gas. From figure 2 a The picture of the color change shows that the color change of the sensor prepared by immobilization of silica gel sol gel is the most obvious, and the differe...

Embodiment 3

[0034] Weigh 6mg indicator bromothymol blue, add 1mL sol-gel solution (the preparation method of sol-gel is: tetraethoxysilane: n-octane triethoxysilane: ethylene glycol methyl ether: propylene glycol Methyl ether acetate: 0.1M nitric acid: Span 80: water was mixed at a volume ratio of 1:1.5:4:3:0.5:0.04:1, hydrolyzed at room temperature for 16 hours to obtain the second silica gel sol-gel solution) and 40 micro One liter of TBAH aqueous solution with a concentration of 1M, ultrasonically dissolved, and then use a pipette gun to draw 1 microliter and drop-coat it on the polyethylene terephthalate film, and store the film drip-coated with the indicator under nitrogen protection at room temperature and avoid light ,stand-by. Take a piece of film loaded with indicator and place it in a small transparent plastic box (two holes are left on the small box, one is used for air intake, the other is used for air outlet, and the other places are completely sealed) to prepare for use. De...

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Abstract

The invention relates to a method for using a porous silica gel material to immobilize an indicator, a gas sensor and its application, including three aspects: the synthesis of silica gel sol-gel, the immobilization of the indicator and the application of the immobilized indicator in gas detection. Two or more siloxane reagents are used as mixed silicon sources, and the silica gel sol-gel is synthesized by hydrolysis under acidic conditions. The sol-gel is mixed with a specific alcohol-soluble or non-alcohol-soluble indicator, drop-coated on the substrate, and dried under the protection of nitrogen to obtain a sensor that can be used to detect a specific gas. Since the silica sol gel has a porous structure after aging, the specific surface area of ​​the indicator immobilized on the substrate by the silica sol gel is greatly increased, making it easier to contact with the gas to be measured, and improving the sensitivity of the sensor. Sensitivity of gas detection. At the same time, due to the high stability of the silica gel itself, the storage time of the sensor prepared by the sol-gel immobilization method is increased, and the practicability of the sensor is improved.

Description

technical field [0001] The present invention relates to the synthesis of materials and the use of optical means to test or analyze materials. Specifically, it is the synthesis of porous silica gel sol-gel material, the fixation of the indicator and the application of the indicator after immobilization. Due to the large specific surface area and stability of the porous silica sol gel, the sensor prepared by using the silica sol gel immobilized indicator has higher sensitivity in the gas detection process and prolongs the storage time of the sensor. Background technique [0002] The rapid development of modern life has led to more and more complex urban gases, and the impact on human beings is also increasing. The development and utilization of liquefied petroleum gas has greatly benefited family life, but also brought more explosion or fire hazards. In order to ensure the "quality" of the atmospheric environment and the safety of household gas, accurate and effective odor d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/783
Inventor 冯亮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI