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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Colorimetric CO2 Indicators.

Andrew Mills1, Lauren McDonnell1, Dilidaer Yusufu1

  • 1School of Chemistry and Chemical Engineering, Queens University Belfast, David Keir Building, Stranmillis Road, Belfast BT95AG, U.K.

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|August 3, 2023
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Summary
This summary is machine-generated.

This study transforms carbon dioxide (CO2) colorimetric indicators into dry, portable formats like inks and plastics. These novel CO2 sensors offer advantages in simplicity, cost, and portability for various applications.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Carbon dioxide (CO2) plays vital roles in biological and industrial processes.
  • Current CO2 monitoring methods (FTIR, electrochemical) have limitations.
  • Existing CO2 indicators are often water-based, limiting portability and application.

Purpose of the Study:

  • To develop novel, dry CO2-sensitive materials from traditional colorimetric indicators.
  • To highlight advancements in CO2 colorimetric indicator technology by the Mills group.
  • To demonstrate the versatility and advantages of dry CO2 indicators over current methods.

Main Methods:

  • Development of CO2-sensitive inks using pH-sensitive dyes and quaternary ammonium cations in non-aqueous polymer solutions.
  • Creation of CO2-sensitive pigments by coating silica particles with CO2 inks.
  • Incorporation of pigments into plastics via extrusion to form CO2-sensitive films.
  • Utilizing digital camera colorimetry (DCC) for quantitative CO2 measurements.

Main Results:

  • Dry CO2-sensitive inks exhibit reversible color changes in response to CO2, with tunable sensitivity.
  • CO2-sensitive pigments integrated into plastics offer enhanced properties for applications like food packaging and medical diagnostics.
  • Demonstrated quantitative CO2 analysis using DCC, overcoming limitations of visual assessment.
  • Developed specialized indicators for temperature, fizziness in beverages, and air pressure.

Conclusions:

  • Dry CO2 colorimetric indicators represent a significant advancement over traditional methods.
  • These materials offer enhanced portability, cost-effectiveness, and a wider range of applications.
  • Digital camera colorimetry enables quantitative analysis, increasing the commercial viability and impact of these CO2 indicators.