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Inverse-opal hydrogel photonic crystal sensing film capable of realizing naked-eye detection of concentration of cadmium ion

A photonic crystal and inverse opal technology, applied in the measurement of color/spectral properties, analysis by chemical reaction of materials, and material analysis by observing the effect on chemical indicators, which can solve problems such as cumbersome operations and complicated instruments. , to achieve the effect of good mechanical and chemical stability, good reusable performance

Inactive Publication Date: 2016-11-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the detection methods of heavy metal ions mainly include atomic absorption spectroscopy, X-ray fluorescence spectroscopy, mass spectrometry, etc. These detection methods show high sensitivity and accuracy, but they all require complex instruments and tedious operations, and even professional personnel to test

Method used

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  • Inverse-opal hydrogel photonic crystal sensing film capable of realizing naked-eye detection of concentration of cadmium ion
  • Inverse-opal hydrogel photonic crystal sensing film capable of realizing naked-eye detection of concentration of cadmium ion
  • Inverse-opal hydrogel photonic crystal sensing film capable of realizing naked-eye detection of concentration of cadmium ion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of polystyrene microspheres and colloidal crystal templates

[0022] Using styrene as the main monomer, acrylic acid as the crosslinking monomer, ammonium persulfate as the initiator, and double distilled water as the solvent, a polystyrene-acrylic acid microsphere emulsion with a dispersion coefficient of 0.005 was prepared by using a soap-free emulsion polymerization method ( Hereinafter referred to as PS emulsion), a certain amount of PS emulsion with a solid content of 1% was taken out, dispersed evenly by ultrasonic vibration, and then used for later use. Add 20mL of PS microsphere emulsion with a mass fraction of 1% into a 25mL beaker, then insert two hydrophilic treated glass slides into the beaker vertically, and place the beaker at a constant temperature and temperature at 60°C and a humidity of 40%. Wet box, after the water is completely evaporated, the PS colloidal crystal template with a single color can be obtained.

Embodiment 2

[0023] Example 2: Preparation of PAM / PATU gel photonic crystal sensing film with inverse opal structure

[0024] Dissolve AM (32.4mmol), ATU (1.2mmol), APS (0.48mmol), BIS (1.3mmol) in 13mL deionized water, mix well, and then pass through N 2 10min to remove O from the solution 2 Obtain the pre-poly solution for later use. Place a clean glass slide on the surface of the prepared PS colloidal crystal template, and fix it with clips on both sides to form a similar "sandwich" structure. Place the PS colloidal crystal template of the "sandwich" structure flat on the table, and then slowly drip the pre-polymerization solution drop by drop at one end of the template. , when the PS colloidal crystal template becomes transparent, it indicates that the prepolymer liquid is filled. Then it was placed in an oven at 45° C. to thermally initiate the polymerization reaction. After the reaction, the "sandwich" structure was immersed in deionized water, so that the gel photonic crystal f...

Embodiment 3

[0025] Embodiment 3: PAM / PATU gel photonic crystal sensing membrane is the Cd that concentration is 0mmol / L, 2.5mmol / L, 10mmol / L 2+ Solution Spectral Detection

[0026] The prepared gel photonic crystal sensing film was placed in different concentrations (0mmol / L, 0.625mmol / L, 1.25mmol / L, 2.5mmol / L, 5mmol / L, 10mmol / L) of Cd 2+ In the solution, the corresponding Bragg diffraction peak wavelength was measured with a fiber optic spectrometer. When the change of the diffraction peak wavelength does not exceed 3nm, it is considered that the sensing film is sensitive to Cd 2+ The determination reaches equilibrium. The fully responsive sensing membrane was soaked in the eluent (0.8mol / L thiourea-3mol / L HCl) for 10min, then rinsed with deionized water, the experiment was repeated, and corresponding optical photos were taken with a digital camera.

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Abstract

The invention discloses a method for detecting Cd<2+> in a water solution on site in real time by utilizing an inverse-opal hydrogel photonic crystal sensing film. The method comprises firstly preparing a monodisperse polystyrene microsphere, forming a polystyrene colloidal crystal template through assembling, then preparing a precursor solution from acrylamide, allylthiourea, ammonium persulfate and N,N'-methylene diacrylamide, filling clearances of the colloidal crystal template, performing thermal polymerization and removing polystyrene, so as to obtain the inverse-opal hydrogel photonic crystal film. The hydrogel photonic crystal film shows different colors in solutions with different Cd<2+> concentration, and accordingly Cd<2+> can be detected. The method also has the advantages of high sensitivity, good selectivity, strong anti-interference and reusability.

Description

technical field [0001] The invention relates to a colorimetric detection of Cd with naked eyes 2+ The invention discloses an inverse opal gel photonic crystal material of high concentration, which belongs to the technical field of photonic crystal and analysis and detection. Background technique [0002] Cadmium ions (Cd 2+ ) may damage the functional organs of the human body after entering the human body, such as causing atrophy and deformation of human bones. Therefore, Cd 2+ The detection of heavy metal ions has become an important research hotspot in the field of modern detection technology. At present, the detection methods of heavy metal ions mainly include atomic absorption spectroscopy, X-ray fluorescence spectroscopy, mass spectrometry, etc. These detection methods show high sensitivity and accuracy, but they all require complex instruments and tedious operations, and even professional personnel to check. Therefore, it is of practical significance to establish ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/02C08F222/38C08J9/26C08F212/08C08F220/06G01N21/25G01N21/78
CPCC08F212/08C08F220/56C08J9/26C08J2333/26G01N21/25G01N21/78C08F226/02C08F222/385C08F220/06
Inventor 刘士荣张晓东倪忠斌陈明清
Owner JIANGNAN UNIV
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