The development and analysis of turmeric/TiO2 composites for applications in cool nanopigments (NPGs) have been documented. The turmeric/TiO2 NPGs were synthesized via the sonochemichal hydrolysis route, followed by the incorporation of turmeric extract. The synthesized NPGs were characterized using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy for structural analysis, field-emission scanning electron microscopy (FE-SEM) for morphological assessment, and UV-Vis-NIR diffuse reflectance spectroscopy. The results indicated the presence of amorphous TiO2 for the pure sample. Upon the addition of turmeric, the anatase TiO2 phase was formed, with a crystallite size ranging from 9.8 to 13.6 nm as turmeric concentration increased. Both XRD and SEM analyses confirmed the transition from the amorphous phase to the anatase phase due to the addition of turmeric. FTIR analysis verified the existence of functional groups of curcuminoids and TiO2 within turmeric/TiO2 composites. The UV-Vis-NIR diffuse reflectance results displayed a significant absorption band at wavelengths less than 350 nm, which shifted to longer wavelengths as the concentration of turmeric increased. The NIR solar reflectance <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8929_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="42" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{R}_{NIR}^{}\)</EquationSource> </InlineEquation> values varied from 80.54 to 73%, demonstrating a decline with higher turmeric content. The <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8929_Article_IEq2.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="39" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{R}_{VIS}^{}\)</EquationSource> </InlineEquation> values diminished with the introduction of turmeric, indicating a reduction in the glare from sunlight reflections in the outdoor use of NPGs. The color coordinates of the NPGs were assessed, revealing a shift from white to reddish yellow as turmeric concentration increased. These results indicate the promising potential of turmeric/TiO2 composites as efficient cool nanopigments applications.

Nanoarchitectonics and photophysical properties of turmeric/titania for the development of cool color nanopigments

期刊论文
发表日期：

2025年9月19日

查看全文

Amira Ben Gouider Trabelsi,
Fatemah H. Alkallas,
Shehab A. Mansour,
Ashraf H. Farha

摘要

The development and analysis of turmeric/TiO₂ composites for applications in cool nanopigments (NPGs) have been documented. The turmeric/TiO₂ NPGs were synthesized via the sonochemichal hydrolysis route, followed by the incorporation of turmeric extract. The synthesized NPGs were characterized using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy for structural analysis, field-emission scanning electron microscopy (FE-SEM) for morphological assessment, and UV-Vis-NIR diffuse reflectance spectroscopy. The results indicated the presence of amorphous TiO₂ for the pure sample. Upon the addition of turmeric, the anatase TiO₂ phase was formed, with a crystallite size ranging from 9.8 to 13.6 nm as turmeric concentration increased. Both XRD and SEM analyses confirmed the transition from the amorphous phase to the anatase phase due to the addition of turmeric. FTIR analysis verified the existence of functional groups of curcuminoids and TiO₂ within turmeric/TiO₂ composites. The UV-Vis-NIR diffuse reflectance results displayed a significant absorption band at wavelengths less than 350 nm, which shifted to longer wavelengths as the concentration of turmeric increased. The NIR solar reflectance \(\:{R}_{NIR}^{*}\) values varied from 80.54 to 73%, demonstrating a decline with higher turmeric content. The \(\:{R}_{VIS}^{*}\) values diminished with the introduction of turmeric, indicating a reduction in the glare from sunlight reflections in the outdoor use of NPGs. The color coordinates of the NPGs were assessed, revealing a shift from white to reddish yellow as turmeric concentration increased. These results indicate the promising potential of turmeric/TiO₂ composites as efficient cool nanopigments applications.