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Optical Hydrogel Detector for pH Measurements.

Yousef Alqurashi1, Mohamed Elsherif2, Asail Hendi3

  • 1Department of Mechanical Engineering, School of Engineering, Shaqra University, Dawadmi 11921, Saudi Arabia.

Biosensors
|January 20, 2022
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Summary

A new optical pH sensor uses a hydrogel lens to detect acidity changes. This sensitive, reversible sensor offers potential for medical diagnostics and wearable devices.

Keywords:
Fresnel lenshydroxyethyl methacrylatepH-responsive hydrogelssensors

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Optical Sensing

Background:

  • Accurate pH measurement is crucial for health and food safety.
  • Traditional pH methods are expensive and lack sensitivity.
  • Novel sensor technologies are needed for improved pH monitoring.

Purpose of the Study:

  • To develop a novel, cost-effective, and sensitive pH sensor.
  • To utilize a pH-responsive hydrogel with a Fresnel lens pattern.
  • To explore optical power changes for pH detection.

Main Methods:

  • Fabricated a pH-responsive hydrogel with a replicated Fresnel lens pattern.
  • Tested sensor performance across a pH range of 4-7.
  • Measured changes in optical power due to hydrogel swelling and lens dimension alteration.

Main Results:

  • The optical sensor demonstrated sensitivity to pH variations.
  • Optimal performance was observed in the acidic range (pH 4.5-5.5), with a 13% power increase.
  • The sensor showed high sensitivity, fast response, and reversibility.

Conclusions:

  • The developed hydrogel-based optical pH sensor is a promising technology.
  • Potential applications include medical point-of-care diagnostics.
  • The sensor is suitable for wearable continuous pH monitoring devices.