Air sensitive gel for detecting benzene molecules and preparation method of air sensitive gel

An air-sensitive gel and molecular technology, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators, can solve the problems of inconvenient detection, high detection cost, and impact. Achieve the effects of strong practical value, simple preparation, and simple preparation method

Active Publication Date: 2019-10-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This detection method needs to rely on detection instruments, the detection cost

Method used

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  • Air sensitive gel for detecting benzene molecules and preparation method of air sensitive gel
  • Air sensitive gel for detecting benzene molecules and preparation method of air sensitive gel
  • Air sensitive gel for detecting benzene molecules and preparation method of air sensitive gel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] A method for preparing gas-sensitive gel for detecting benzene series molecules, the steps are as follows:

[0043] Add 200 mg of β-CD to 1.44g of DMF, mix and dissolve it thoroughly by ultrasound to obtain a transparent and colorless β-cyclodextrin solution; add 3.36g of water to the β-cyclodextrin solution, shake it evenly, and then stand still Let it stand for 1 hour until the solution forms a gel to obtain an aero-sensitive gel.

Example Embodiment

[0044] Example 2

[0045] Application of air-sensitive gel:

[0046] Add 50μL of toluene into a 40mm×70mm large bottle, place the aero-sensitive gel prepared in Example 1 in an open vial, place the open vial in the large bottle, seal the large bottle, create an organic vapor environment, and let it stand for 5h Later, it can be observed that the gas-sensitive gel collapses significantly, and then turns into precipitation (such as image 3 Shown). Realize the detection of toluene gas by the gas-sensitive gel

Example Embodiment

[0047] Example 3

[0048] Application of air-sensitive gel:

[0049] Add 25μL of toluene and 25μL of methanol into a large 40mm×70mm bottle, put the aerosensitive gel prepared in Example 1 in an open vial, seal the large vial in the open vial, create an organic vapor environment, 3h later , It can be observed that the gas-sensitive gel has collapsed significantly and began to transform into precipitation. That is to say, as long as the mixed steam contains toluene, the gas-sensitive gel can be effectively detected. ( Figure 4 with Figure 5 (The XRD and OM diagrams of the system after treatment with different mixed solvents)

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Abstract

The invention relates to an air sensitive gel for detecting benzene molecules and a preparation method of the air sensitive gel. The air sensitive gel is prepared by forming a gel by an organic gel factor, namely cyclodextrin, in a mixed solvent, wherein the mixed solvent is a mixed system of water and an organic solvent; the mass percentage of the cyclodextrin in the mixed solvent is 3-15wt%; andthe volume ratio of the organic solvent to the water in the mixed solvent is (7:3)-(2:8). The air sensitive gel provided by the invention is safe in raw material, simple and convenient in preparationand very good in selectivity when being adopted to detect the benzene molecules; and after detection molecules are removed through heating, the response gel can be cooled and turned into the gel again, then repeated use can be achieved, detection results can be directly observed with naked eyes without other measures, and very good practical application values can be made.

Description

technical field [0001] The invention relates to an air-sensitive gel for detecting benzene series molecules and a preparation method thereof, belonging to the field of functional materials. Background technique [0002] β-cyclodextrin (abbreviated as β-CD, structural formula as formula 1) is a macrocyclic molecule composed of 7 D-type glucopyranose units connected end-to-end. The inner cavity is hydrophobic and the outer is hydrophilic. The cavity has a certain size , can be included with the guest molecules of specific structure through host-guest interaction, this inclusion process is dynamic and can be controlled by external stimuli. Therefore, it is of great value to use β-cyclodextrin to prepare stimuli-responsive gel materials. [0003] [0004] Benzene series (including benzene, toluene, ethylbenzene, xylene, etc.) is a gas with a special aromatic smell, which can be used in organic solvents of building materials, such as paint additives and thinners, waterproof m...

Claims

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Application Information

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IPC IPC(8): C08J3/075G01N21/82C08L5/16
CPCC08J3/075C08J2305/16G01N21/82
Inventor 邢鹏遥成秋鸿郝爱友
Owner SHANDONG UNIV
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