Chitosan microspheres encapsulating phenolphthalein for epoxy coatings: pH-responsive release and smart corrosion warning

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• The pH-responsive release of phenolphthalein from chitosan microspheres indicates potential for smart corrosion warning systems.
• Testing in varying pH environments showed effective control over the release of phenolphthalein.
• Assessment involved encapsulating phenolphthalein with chitosan microspheres as a protective measure in epoxy coatings.
• These findings suggest a novel approach for smart monitoring of corrosion in coating applications.