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HYDROGEL, PREPARATION METHOD THEREOF, AND pH SENSOR COMPRISING THE SAME

a technology of ph sensor and hydrogel, which is applied in the direction of chemical methods analysis, chemical indicators, instruments, etc., can solve the problems of difficult use in various fields, difficult to monitor air pollution, and non-recyclable ph paper, etc., and achieves the effect of easy application or coating

Inactive Publication Date: 2015-12-17
IND ACADEMIC CORP FOUND YONSEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide a hydrogel that can replace conventional pH paper and measure the pH of various samples. This hydrogel is continuous, reusable, and easy to apply or coat in various fields. Additionally, a pH sensor that includes this hydrogel is also provided. Overall, this invention provides a more efficient and versatile solution for pH measurement.

Problems solved by technology

The pH paper is easily available and is simple to use, but can be limitedly used for samples containing at least a certain amount of moisture or liquid-state samples, and is difficult to use for the monitoring of air pollution, the measurement of pH of moisture-free samples, the monitoring of leakage of strong acids or strong bases, etc.
In addition, the pH paper is not recyclable once used, and is difficult to use in various fields.
Thus, the pH paper is insufficient to function as a sensor.

Method used

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  • HYDROGEL, PREPARATION METHOD THEREOF, AND pH SENSOR COMPRISING THE SAME
  • HYDROGEL, PREPARATION METHOD THEREOF, AND pH SENSOR COMPRISING THE SAME
  • HYDROGEL, PREPARATION METHOD THEREOF, AND pH SENSOR COMPRISING THE SAME

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Hydrogel

[0058]The following mixtures 1 to 3 were prepared.

[0059]Mixture 1: 500 mg of alginate (molecular weight: 25,000) was dissolved in 100 ml of phosphate buffered saline (PBS; pH 7.5).

[0060]Mixture 2: 750 mg of EDC was dissolved in 30 ml of methanol.

[0061]Mixture 3: 1 g of dopamine was dissolved in 30 ml of methanol.

[0062]Mixtures 1 to 3 were mixed in the order of mixtures 1, 2 and 3 and allowed to react for 24 hours. The resulting reaction mixture was subjected to fractional distillation at 80° C. and low pressure to remove methanol. Then, the remaining material was dissolved in deionized water at a pH of 5 or less, and dialyzed against deionized water for 24 hours, followed by freeze drying, thereby obtaining 500 mg of a polymer complex.

[0063]100 mg of the obtained polymer complex (Alg-C) was mixed with 10 a of 1 mM pyrocatechol violet (PV) solution, thereby preparing a hydrogel.

example 2

Measurement of Mechanical Properties of Hydrogel

[0064]The mechanical properties of the hydrogel prepared in Example 1 were measured.

[0065]FIG. 11 is a graph showing the results of measuring the adhesion strength (FIG. 11a) and modulus (FIG. 11b) of a conventional alginate hydrogel containing calcium (Alg-Ca), and the inventive polymer complex hydrogel comprising catechol bonded to alginate (Alg-C), under varying pH conditions. Referring to FIG. 11, it can be seen that the hydrogel of the present invention exhibits excellent gel properties in terms of adhesion strength, elasticity and viscosity at pHs of 3, 7 and 10.

example 3

Application of Hydrogel

[0066]The hydrogel prepared in Example 1 is a catechol-containing organic compound having a network structure, and thus has an advantage in that it is easily bonded to and coated on various materials.

[0067]FIG. 12 is a photograph showing various substrates (an acrylic resin substrate, a PDMS substrate, a polystyrene substrate, a gold substrate, a glass substrate, and an FTO glass substrate, shown from the left to the right side) obtained by applying the hydrogel of the present invention to the surfaces thereof and dropping an acidic solution or a basic solution onto the surfaces (three substrates shown from the left: acidic solution; and three substrates shown from the right: basic solution).

[0068]As can be seen in FIG. 12, the hydrogel of the present invention can be easily applied to and coated on substrates made of various materials, including polymer substrates, metal substrates, and substrates made of inorganic materials, and thus can be used in various i...

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Abstract

The present invention relates to a hydrogel, a preparation method thereof, and a pH sensor comprising the same, and more particularly, to a hydrogel, which can substitute for conventional pH paper, is continuously usable, can be used in various applications, and reversibly changes color depending on the pH of a sample, and to a pH sensor comprising the same. The hydrogel comprises: a polymer complex wherein a first organic compound containing an aromatic functional group having at least one hydroxyl group bonded thereto is joined to a carboxyl group-containing polysaccharide by a peptide bond; and an organic dye comprising a second organic compound containing an aromatic functional group having at least one hydroxyl group bonded thereto.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a hydrogel, a preparation method thereof, and a pH sensor comprising the same, and more particularly, to a hydrogel, which can substitute for conventional pH paper, is continuously usable, can be used in various applications, and reversibly changes color depending on the pH of a sample, and to a pH sensor comprising the same.[0003]2. Description of the Prior Art[0004]A technology for measuring or sensing pH is required in various technical fields. To measure or sense pH, pH paper has been widely used. The pH paper is easily available and is simple to use, but can be limitedly used for samples containing at least a certain amount of moisture or liquid-state samples, and is difficult to use for the monitoring of air pollution, the measurement of pH of moisture-free samples, the monitoring of leakage of strong acids or strong bases, etc. In addition, the pH paper is not recyclable once used...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N21/80C08K5/42C08K5/29C08J3/075C08J3/20
CPCG01N21/80C08J3/075C08J3/203C08J2305/04C08K5/42G01N2021/7759C08K5/29G01N2021/7763
Inventor LEE, SANG YUPLEE, CHAEMYEONGKIM, MIN CHULKWAK, JIN YOUNGPARK, SANG WOOLIM, YOUNG JUN
Owner IND ACADEMIC CORP FOUND YONSEI UNIV
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