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The visible reflectance spectrum stability and water content resistivity of natural dye coating paint film consisting chlorophyll
摘要： The purpose of this paper is to study the colour stability and water content resistivity of the green colour coating paint film (consisting of chlorophyll) during exposure to ultraviolet A (UV-A). The natural green dye was prepared by immersing Cassia alata L. leaves in absolute ethanol. The extract was prepared in two batches of dye samples where one of it was a pure dye and the other was added with 3 Wt. % Cu(NO3)2 as an additive. Polymer blend as a binder was prepared by mixing poly(methyl methacrylate) (PMMA) and commercial acrylic polyol. The blended polymer was mixed with the natural dye in a specific ratio and applied as coating paint film on glass panel surfaces. The visible spectrum stability (colour stability) and water content resistivity of the coating paint films during exposure to UV-A were monitored. Addition of Cu(NO3)2 had improved the colour stability of the coating paint film. Fourier transform infrared spectroscopy analysis showed that both coating paint films do not absorb water and are resistive to water content. The ability of Cu(NO3)2 as an colour stability additive to the natural green dye applied in the coating paint film. The coating paint film developed in this work is suitable to be applied on glass substrates. The colour stability of the coating paint film was analysed by using the reflectance spectrum.
关键词： Chlorophyll,Colour stability,Natural dye,Paints,Organic coatings
更新于2025-09-11 14:15:04
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Organic-inorganic composite nanocoatings with superhydrophobicity and thermal stability
摘要： Purpose – This paper aims to investigate the thermal stability and hydrophobicity of difference alkyl chain of silanes with silicon (Si) micro- and nanoparticles. Design/methodology/approach – Sol-gel methods have been used to design superhydrophobic glass substrates through surface modi?cation by using low-surface-energy Isooctyl trimethoxysilane (ITMS) and Ethyl trimethoxysilane (ETMS) solution. Hierarchical double-rough scale solid surface was built by Si micro- and nanoparticles to enhance the surface roughness. The prepared sol was applied onto glass substrate using dip-coating method and was dried at control temperature of 400°C inside the tube furnace. Findings – The glass substrate achieved the water contact angle as high as 154 6 2° and 150.4 6 2° for Si/ITMS and Si/ETMS ?lms, respectively. The Si/ITMS and Si/ETMS also were equipped with low sliding angle as low as 3° and 5°, respectively. The Si micro- and nanoparticles in the coating system have created nanopillars between them, which will suspend the water droplets. Both superhydrophobic coatings have showed good stability against high temperature up to 200°C as there are no changes in WCA shown by both coatings. Si/ITMS ?lm sustains its superhydrophobicity after impacting with further temperature up to 400°C and turns hydrophobic state at 450°C. Research limitations/implications – Findings will be useful to develop superhydrophobic coatings with high thermal stability. Practical implications – Sol method provides a suitable medium for the combination of organic-inorganic network to achieve high hydrophobicity with optimum surface roughness. Originality/value – Application of different alkyl chain groups of silane resin blending with micro- and nanoparticles of Si pigments develops superhydrophobic coatings with high thermal stability.
关键词： Superhydrophobic,Organic coatings,Thermal stability,Coatings,Hierarchical roughness
更新于2025-09-09 09:28:46