Formation of Turmeric-Based Thin Films: Universal, Transparent Coatings.

Area of Science:

• Materials Science
• Surface Chemistry
• Biomaterials

Background:

• Curry stains highlight turmeric's staining properties.
• Turmeric powder, rich in curcuminoids, is a natural compound with potential applications.
• Developing universal coating materials is crucial for various industries.

Purpose of the Study:

• To explore turmeric powder as a universal coating material.
• To develop an optimized method for creating turmeric-based coatings.
• To evaluate the substrate-independent coating capability of turmeric.

Main Methods:

• Optimizing conditions for turmeric slurry preparation and filtration.
• Forming turmeric-based coatings at pH 3.
• Applying coatings to various inorganic and polymeric substrates.
• Measuring water contact angles before and after coating.
• Analyzing film composition using X-ray photoelectron spectroscopy.

Main Results:

• Ultrathin, transparent turmeric films were successfully formed.
• Coatings were applied to diverse substrates including gold, TiO2, glass, stainless steel, and polymers like PTFE and COC.
• Water contact angles significantly decreased, converging to approximately 35° for most substrates.
• Turmeric coatings demonstrated substrate-independent universal coating capabilities.
• X-ray photoelectron spectroscopy detected nitrogen, suggesting amine involvement in film formation.

Conclusions:

• Turmeric powder can be utilized as a universal coating material.
• The developed method yields stable, transparent, and ultrathin films.
• Turmeric coatings offer a promising, eco-friendly solution for surface modification across various materials.