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Method using three-dimensional photonic crystals to measure potential of hydrogen (pH)

A photonic crystal, three-dimensional technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of poor stability and low measurement accuracy, and achieve the effect of simple equipment, continuous measurement, and stable measurement value

Active Publication Date: 2013-06-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring pH using three-dimensional photonic crystals in order to solve the problems of low accuracy and poor stability of solution pH measurement in existing methods

Method used

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  • Method using three-dimensional photonic crystals to measure potential of hydrogen (pH)
  • Method using three-dimensional photonic crystals to measure potential of hydrogen (pH)
  • Method using three-dimensional photonic crystals to measure potential of hydrogen (pH)

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specific Embodiment approach 1

[0014] Specific implementation mode one: the method for using three-dimensional photonic crystals to measure pH in this implementation mode is implemented according to the following steps:

[0015] 1. Pass nitrogen into 90-120mL of ultra-pure water, heat to 65-95°C, keep the temperature for 25-45 minutes, add methacrylic acid and styrene, then adjust the pH of the reaction system to 9-12 with NaOH solution, add 0.184-0.334 g of potassium persulfate, stir evenly, and react at a temperature of 55-75°C for 2-3 hours to obtain a microsphere solution; 2. Add ultrapure water to the microsphere solution to adjust the volume fraction of the microsphere solution to 0.1%-0.3 %, put it in a constant temperature box, and deposit a photonic crystal film at a temperature of 50-70°C for 4-6 days to obtain a photonic crystal film; 3. Put the photonic crystal film obtained in step 2 into solutions with different pH values, and use a spectrometer to sequentially measure the photonic crystal film...

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that the stirring speed in Step 1 is 150 r / min. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that step 1 is reacted at a temperature of 60-70°C for 2-3 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method using three-dimensional photonic crystals to measure potential of hydrogen (pH), and relates to a method for measuring a pH valve of solution. The method using the three-dimensional photonic crystals to measure the pH aims to solve the problem that when used for measuring the pH, an existing method is not high in accuracy, and not good in stability. The method using the three-dimensional photonic crystals to measure the pH comprises a first step of adding methacrylic acid and vinyl benzene to ultrapure water, adjusting and extracting the pH, adding potassium persulfate and carrying out stirring in an even mode, a second step of adding ultrapure water to adjust volume fraction of the solution, and placing the solution into a constant temperature box, carrying out deposition and obtaining a photonic crystal film, a third step of placing the photonic crystal film into solution with different pH values, sequentially measuring reflection spectral curves of the photonic crystal film and matching a relation curve of the wavelength of the wave peak position of the reflected light of a pH value and the photonic crystal film, and a fourth step of soaking the photonic crystal film in the solution to be measured, measuring a curve of reflectance spectrum, and inferring the pH valve of the to-be-measured solution. A device, used for preparing the photonic crystal film, of the method is simple, the film can be repeatedly used, a measured value of the pH is accurate, a measured numerical value is stable, and the method using the three-dimensional photonic crystals to measure the pH is mainly used for measurement of the pH of the solution.

Description

technical field [0001] The invention relates to a method for measuring the pH value of a solution. Background technique [0002] The pH value is a basic parameter to mark the acid-base concentration of a solution, and the measurement of the pH value is widely used in electric power, environmental protection, chemical industry and other departments. At present, there are many sensors for measuring the pH value of solutions, such as photochemical pH sensors, ion-sensitive pH sensors, glass electrode sensors, antimony electrode sensors, enzyme pH sensors, etc., but these pH sensors do not have the characteristics of accurate measurement and good stability at the same time. . [0003] The concept of photonic crystal was first proposed by Yablonovitch and John, which is an artificial microstructure formed by periodic arrangement of media with different refractive indices. Due to its important superiority of photonic band gap, it plays an important role in many modern high-tech ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 赵九蓬曲慧颖李垚祁生铭潘磊
Owner HARBIN INST OF TECH
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