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A kind of highly sensitive photonic crystal pH colorimetric sensor and preparation method thereof

A technology of colorimetric sensors, photonic crystals, applied in nanotechnology for sensing, measurement of color/spectral properties, nanotechnology for materials and surface science, etc.

Active Publication Date: 2022-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is still a challenge to develop a photonic crystal pH colorimetric sensor with higher naked-eye recognition sensitivity under high ionic strength.

Method used

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  • A kind of highly sensitive photonic crystal pH colorimetric sensor and preparation method thereof
  • A kind of highly sensitive photonic crystal pH colorimetric sensor and preparation method thereof
  • A kind of highly sensitive photonic crystal pH colorimetric sensor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) Dispersing superparamagnetic nanoparticles (superparamagnetic iron tetroxide nanoparticles wrapped in polyvinylpyrrolidone) with a particle size of 100nm with a steric hindrance effect into a mixture of hydroxyethyl methacrylate (HEMA), Acrylic acid (AA), crosslinking agent ethylene glycol dimethacrylate (EGDMA), thermal initiator ammonium persulfate (APS), ethylene glycol and water to form a prepolymer solution. In the pre-polymerization solution, the concentration of superparamagnetic nanoparticles is 10mg / mL, the concentration of HEMA monomer is 1.68mmol / mL, the concentration of AA monomer is 2.52mmol / mL, and the concentrations of EGDMA and APS are respectively The volume ratio of ethylene glycol and water is 5:2.

[0051] (2) Place the pre-polymerization liquid under an external magnetic field of 500 gauss, keep the magnetic field constant after magnetization for 30s, and place it in a blast drying oven at the same time, polymerize on the modified glass substrat...

Embodiment 2

[0060] (1) Disperse superparamagnetic nanoparticles (superparamagnetic iron tetraoxide nanoparticles wrapped in polyvinylpyrrolidone) with a particle size of 100nm and a steric hindrance effect into a mixture of methyl methacrylate (MMA), acrylic acid (AA), cross-linking agent ethylene glycol dimethacrylate (EGDMA), thermal initiator ammonium persulfate (APS), ethylene glycol and water to form a prepolymer solution. In the pre-polymerization solution, the concentration of superparamagnetic nanoparticles is 1mg / mL, the concentration of MMA monomer is 1.68mmol / ml, the concentration of AA monomer is 2.52mmol / ml, and the concentrations of EGDMA and APS are MMA and AA monomer respectively. The volume ratio of ethylene glycol and water is 5:2.

[0061] (2) Place the pre-polymerization solution under an external magnetic field of 500Gs, keep the magnetic field constant after magnetization for 30s, and place it in a blast drying oven, and polymerize it on an unmodified glass substrate...

Embodiment 3

[0066] (1) Disperse superparamagnetic nanoparticles (superparamagnetic ferric oxide nanoparticles wrapped in polyvinylpyrrolidone) with a particle size of 50nm and a steric hindrance effect into a mixture of acrylic acid (AA) and crosslinking agent ethylene glycol The prepolymer solution is formed in a solution composed of alcohol dimethacrylate (EGDMA), thermal initiator ammonium persulfate (APS), ethylene glycol and water. In the pre-polymerization solution, the concentration of superparamagnetic nanoparticles is 200mg / mL, the concentration of AA monomer is 10mmol / mL, the concentrations of EGDMA and APS are respectively 0.75% and 2% of the total molar amount of AA monomer, ethylene glycol and The volume ratio of water is 5:2.

[0067] (2) Place the pre-polymerization solution under an external magnetic field of 200Gs, keep the magnetic field constant after magnetization for 30s, and place it in a blast drying oven to polymerize on the modified polydimethylsiloxane (PDMS) fle...

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Abstract

The invention relates to the field of photonic crystal material preparation, in particular to a high-sensitivity photonic crystal pH colorimetric sensor and a preparation method thereof. The high-sensitivity photonic crystal pH colorimetric sensor includes a pH-responsive photonic crystal gel film assembled from monodisperse superparamagnetic nanoparticles into chain-like one-dimensional photonic crystal collectives After orientation, it is fixed as a dispersed phase in the continuous phase composed of pH-responsive polymer gel matrix. The photonic crystal pH colorimetric sensor of the present invention can achieve high-sensitivity detection only by human eye recognition in the visible spectrum range under high ionic strength. The maximum value achieved is ≧350nm / pH; when the ionic strength is ≦500mmol / L, the maximum value of the sensitivity can be ≧300nm / pH.

Description

technical field [0001] The invention relates to the field of photonic crystal material preparation, in particular to a high-sensitivity photonic crystal pH colorimetric sensor and a preparation method thereof. Background technique [0002] The highly sensitive monitoring of pH value is of great significance in the fields of biochemical analysis, food, soil detection, environmental monitoring and pharmaceuticals. Usually, one needs to use modern instruments based on electrochemical methods (such as pH meters) or spectroscopic principles (fluorescence, Raman, surface plasmon resonance, etc.) to achieve highly sensitive measurement of pH value. However, the instrument is expensive, requires energy consumption, lacks portability, and requires professional operation skills. Correspondingly, the pH test paper based on the colorimetric detection method only needs human eyes to observe the color change to determine the pH value, and has the advantages of low cost, no energy consump...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25B82Y15/00B82Y30/00B82Y40/00
CPCG01N21/25B82Y15/00B82Y30/00B82Y40/00
Inventor 罗巍邓鹏马会茹官建国
Owner WUHAN UNIV OF TECH