Colour-fast eco-friendly nanoparticles for dyeing cotton fabrics
doi:10.1038/nindia.2021.97 Published online 15 July 2021
Researchers in Tamil Nadu have used peels of mangostan fruit to make gold nanoparticles of different colours that they say are non-toxic and could be used to dye cotton fabrics1.
They found that cotton wicks dyed with these nanoparticles retained their colours even after being exposed to sunlight or colour-degrading substances such as acid, alkali and commercial detergents.
This offers an eco-friendly way to produce the dyes, which could replace toxic dyes currently used in textile and other industries.
The scientists from the Manonmaniam Sundaranar University prepared a powdered extract using the fruit peels of Garcinia mangostana. They mixed the extract with chloroauric acid (gold solution) and heated the mixture to generate gold nanoparticles. Changing the concentration of the acid, they made yellow, purple and pink gold nanoparticles.
To test their efficiency, the researchers dipped cotton wicks in the nanoparticle solutions and got shades of brown, blue and blue-purple. Sophisticated imaging techniques revealed that well-dispersed nanoparticles bound to the surface of the wicks with high aggregation.
1. Sivakavinesan, M. et al. Dyeing of cotton fabric materials with biogenic gold nanoparticles. Sci. Rep. 11, 13249 (2021)