Gel-based pH sensor preparation method thereof

A pH sensor and gel technology, applied in the gel-based pH sensor, in the field of preparation of the pH sensor, can solve problems such as detection range and sensitivity technical bottlenecks, improve the flexibility of use and application fields, enhance sensitivity, and expand measurement range effect

Active Publication Date: 2014-01-29
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing gel-based pH sensors still have technical bottlenecks in detection range and sensitivity

Method used

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  • Gel-based pH sensor preparation method thereof
  • Gel-based pH sensor preparation method thereof
  • Gel-based pH sensor preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A gel-based pH sensor, which is a poly(acrylamide / methacrylic acid) (P(AM / MAA)) gel microsphere embedded in a polyvinyl alcohol gel as a matrix and simultaneously immobilized Composite with Congo Red. Wherein the molecular weight of polyvinyl alcohol is 88000, and the alcoholysis degree is 88%; The mass ratio of polyvinyl alcohol and poly(acrylamide / methacrylic acid) gel microsphere is 20: 1. A glutaraldehyde crosslinking agent is also added to the composite material, and the amount of glutaraldehyde used is 2.5% of the mass of polyvinyl alcohol.

[0033] The preparation method of the above-mentioned gel-based pH sensor comprises the following steps:

[0034] (1) Dissolve 3.2g of acrylamide, 1.8g of methacrylic acid and 0.1g of methylenebisacrylamide in 90g of absolute ethanol, add them to a three-necked flask with mechanical stirring and a condenser, and pass nitrogen gas to remove oxygen for 1 hour; Dissolve 0.08g of azobisisobutyronitrile initiator in 5g of ethanol...

Embodiment 2

[0039] A gel-based pH sensor, which is a poly(acrylamide / methacrylic acid) (P(AM / MAA)) gel microsphere embedded in a polyvinyl alcohol gel as a matrix and simultaneously immobilized Composite with Congo Red. Wherein the molecular weight of polyvinyl alcohol is 95000, and the alcoholysis degree is 95%; The mass ratio of polyvinyl alcohol and poly(acrylamide / methacrylic acid) gel microsphere is 8: 1. Glutaraldehyde crosslinking agent is also added in the composite material, and the dosage of glutaraldehyde is 3.0% of the mass of polyvinyl alcohol.

[0040] The preparation method of the above-mentioned gel-based pH sensor comprises the following steps:

[0041] (1) Dissolve 2.8g of acrylamide, 2.2g of methacrylic acid and 0.06g of methylene bisacrylamide in 90g of absolute ethanol, add them to a three-necked flask with mechanical stirring and a condenser, and pass nitrogen gas to remove oxygen for 1 hour; Dissolve 0.10g of azobisisobutyronitrile initiator in 5g of ethanol, heat...

Embodiment 3

[0047] A gel-based pH sensor, which is a poly(acrylamide / methacrylic acid) (P(AM / MAA)) gel microsphere embedded in a polyvinyl alcohol gel as a matrix and simultaneously immobilized Composite with Congo Red. Wherein the molecular weight of polyvinyl alcohol is 90000, and the alcoholysis degree is 99%; The mass ratio of polyvinyl alcohol and poly(acrylamide / methacrylic acid) gel microsphere is 16: 1. A glutaraldehyde crosslinking agent is also added to the composite material, and the amount of glutaraldehyde used is 2.5% of the mass of polyvinyl alcohol.

[0048] The preparation method of the above-mentioned gel-based pH sensor comprises the following steps:

[0049] (1) Dissolve 2.6g of acrylamide, 2.4g of methacrylic acid and 0.1g of methylene bisacrylamide in 90g of absolute ethanol, add them to a three-necked flask with mechanical stirring and a condenser, and pass through nitrogen to remove oxygen for 1 hour; Dissolve 0.06g of azobisisobutyronitrile initiator in 5g of et...

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Abstract

The invention provides a gel-based pH sensor and a preparation method thereof, belonging to the technical field of intelligent high molecules and sensors. The pH sensor is a composite material which takes polyvinyl alcohol gel as a matrix, and immobilizes and buries poly(acrylamide/methylacrylic acid) gel microspheres and immobilizes Congo red. The preparation method comprises the following steps: preparing a poly(acrylamide/methylacrylic acid) gel microsphere suspension; adding the microsphere suspension to polyvinyl alcohol aqueous liquor to crosslink and gelatinize; soaking a gel film in the Congo red for soaking, alkali treatment and washing to obtain a product. The gel-based pH sensor provided by the invention has the characteristics of absorbancy response and color response, so that visual simple measurement and precise measurement of pH value can be realized, and the using agility and application field of the pH gel sensor can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of intelligent polymers and sensors, and in particular relates to a novel gel-based pH sensor, and also relates to a preparation method of the pH sensor. Background technique [0002] Accurate and rapid measurement of pH value plays an important role in the fields of industrial and agricultural production, medicine and health, and environmental analysis. For example, many biochemical reactions and pharmaceutical processes are most effective in a constant or narrow pH range. Monitoring is the basic monitoring item in environmental monitoring. Although traditional electrochemical pH sensors such as glass electrodes have the characteristics of high reliability and good reproducibility, they also have defects such as susceptible to electromagnetic interference, poor mechanical strength, signal drift during long-term use, and difficulty in miniaturization. Applications in physiological hygiene, high acid-base en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/80
Inventor 刘捷郑学晶刘广力李霞汤克勇
Owner ZHENGZHOU UNIV
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