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Method for measuring pH by using photonic crystal wettability

A photonic crystal and wettability technology, applied in the field of pH measurement, can solve the problems of low measurement accuracy and poor stability, and achieve the effects of stable measurement value, simple equipment and accurate pH measurement value

Inactive Publication Date: 2014-06-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring pH by using photonic crystal wettability in order to solve the problem that the existing method has low accuracy, poor stability or easy to be affected by ionic strength in solution pH measurement

Method used

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  • Method for measuring pH by using photonic crystal wettability
  • Method for measuring pH by using photonic crystal wettability

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for measuring pH utilizing wettability of photonic crystals, adopting the following steps:

[0031] 1) Synthesis of monodisperse silica microspheres by sol-gel method: take 36mL of absolute ethanol, keep the temperature at 25°C, add 1.7g of tetraethyl orthosilicate, 1.7g of water, and 1.7g of ammonia in sequence, stir well, and React at 25°C for more than 10 hours to obtain an ethanol dispersion of microspheres;

[0032] 2) Dilute the emulsion prepared in step 1) into a 0.7% ethanol emulsion by centrifugation-ultrasonic purification, and deposit silica microspheres in a thermostat at a temperature of 25°C by self-assembly method A silica opal photonic crystal film is formed on a glass substrate, using the film as a template:

[0033] 3) Take 14 templates obtained in step 2), drop them into the polymer precursor solution (mass fraction) of the following formula, and polymerize under normal temperature by ultraviolet light:

[0034]

[0035]

[0036] 4) U...

Embodiment 2

[0040] A method for measuring pH utilizing wettability of photonic crystals, adopting the following steps:

[0041] 1) Synthesis of monodisperse silica microspheres by sol-gel method: take 50mL of absolute ethanol, keep the temperature at 22°C, add 1.7g of tetraethyl orthosilicate, 2g of water, and 1.5g of ammonia in sequence, stir well, and Reaction at ℃ for more than 10 hours to obtain ethanol dispersion of microspheres;

[0042] 2) Dilute the emulsion prepared in step 1) into an ethanol emulsion with a mass fraction of 0.8% after centrifugal-ultrasonic purification, and deposit silica microspheres in an incubator at a temperature of 28°C by self-assembly method A silica opal photonic crystal film is formed on a glass substrate, using the film as a template:

[0043] 3) Take 10 templates obtained in step 2), drop them into the polymer precursor solution (mass fraction) of the following formula, and polymerize under normal temperature by ultraviolet light:

[0044] ...

Embodiment 3

[0049]A method for measuring pH utilizing wettability of photonic crystals, adopting the following steps:

[0050] 1) Synthesis of monodisperse silica microspheres by persol-gel method: take 40mL of absolute ethanol, keep the temperature at 26°C, add 1.5g of tetraethyl orthosilicate, 2.2g of water, and 1.6g of ammonia water in sequence, stir evenly, and React at 26°C for more than 10 hours to obtain an ethanol dispersion of microspheres;

[0051] 2) Dilute the emulsion prepared in step 1) into a 1% ethanol emulsion by centrifugation-ultrasonic purification, and deposit silica microspheres in a thermostat at a temperature of 30°C by self-assembly method A silica opal photonic crystal film is formed on a glass substrate, using the film as a template:

[0052] 3) Take 20 templates obtained in step 2), and drop them into the polymer precursor solution (mass

[0053] Quantity fraction), polymerized at normal temperature by ultraviolet light:

[0054]

[0055] 4) Using 1.8...

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Abstract

The invention relates to a method for measuring pH by using photonic crystal wettability. The method comprises the following steps: (1) preparing an ethanol dispersion solution of microspheres; (2) preparing a silica photonic crystal film; (3) preparing pH responsive photonic crystal films with different infiltrating abilities; (4) putting the photonic crystal film with a wettability response into the known solutions with different pH values, orderly measuring whether the pH responsive photonic crystal films with different infiltrating abilities can be infiltrated to generate an obvious color change under different pHs, and recording; and (5) soaking an array formed by the pH responsive photonic crystal films with different infiltrating abilities into a to-be-measured solution, and observing the color change, so as to know the pH value of the to-be-measured solution. Compared with the prior art, the method disclosed by the invention can be repeatedly used, and is not affected by ion strength, pH measurement value is accurate, the error is smaller than 0.05-0.2pH, and the measurement numerical value is stable.

Description

technical field [0001] The invention relates to a method for measuring pH, in particular to a method for measuring pH by using photonic crystal wettability. Background technique [0002] The pH value is the basic parameter to mark the acidity and alkalinity of a solution, and the measurement of pH is widely used in many fields such as chemical industry, environmental protection, and agriculture. At present, there are many sensors for measuring pH value, such as pH test paper, glass electrode sensor, enzyme pH sensor, etc., but these pH sensors do not have the characteristics of high accuracy, stability and low cost at the same time. [0003] Photonic crystals refer to materials whose refractive index changes periodically on the submicron scale. Similar to X-rays that can be diffracted in crystals, visible light can be diffracted in photonic crystals to display specific colors. Due to its important superiority of photonic bandgap, it plays an important role in many high-tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/80
Inventor 胡晓斌洪炜赵斌元
Owner SHANGHAI JIAO TONG UNIV
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