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Surface Treatment of Industrial-Grade Magnetite Particles for Enhanced Thermal Stability and Mitigating Paint Contaminants

Sinhababu, Mohua; Roy, Anurag; Kumar, Narendra; Dutta, Monojit; Sundaram, Senthilarasu; Karazhanov, Smagul; Udayabhanu, Gopalkrishnan


Mohua Sinhababu

Anurag Roy

Narendra Kumar

Monojit Dutta

Smagul Karazhanov

Gopalkrishnan Udayabhanu


Pigments can retain their color for many centuries and can withstand the effects of light and weather. The paint industry suffers from issues like aggressive moisture, corrosion, and further environmental contamination of the pigment materials. Low-cost, long-lasting, and large-scale pigments are highly desirable to protect against the challenges of contamination that exist in the paint industry. This exploratory study reinforces the color and thermal stability of industrial-grade (IG) magnetite (Fe3O4). IG Fe3O4 pigments were further considered for surface treatment with sodium hexametaphosphate (SHMP). This metaphosphate hexamer sequestrant provides good dispersion ability and a high surface energy giving thermal and dust protection to the pigment. Various physicochemical characterizations were employed to understand the effectiveness of this treatment across various temperatures (180–300 °C). The X-ray diffraction, Raman, and X-ray photoelectron spectroscopy techniques signify that the SHMP-treated Fe3O4 acquired magnetite phase stability up to 300 °C. In addition, the delta-E color difference method was also adopted to measure the effective pigment properties, where the delta-E value significantly decreased from 8.77 to 0.84 once treated with SHMP at 300 °C. The distinct color retention at 300 °C and the improved dispersion properties of surface-treated Fe3O4 positions this pigment as a robust candidate for high-temperature paint and coating applications. This study further encompasses an effort to design low-cost, large-scale, and thermally stable pigments that can protect against UV-rays, dust, corrosion, and other color contaminants that are endured by building paints.

Journal Article Type Article
Acceptance Date Aug 31, 2021
Online Publication Date Sep 4, 2021
Publication Date 2021
Deposit Date Jan 31, 2022
Publicly Available Date Jan 31, 2022
Journal Nanomaterials
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 11
Issue 9
Article Number 2299
Keywords magnetite; thermal stability; environmental contamination; SHMP-treated; XRD; calcined; color difference value
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