Wash fastness improvement of malachite green-dyed cotton fabrics coated with nanosol composites of silica-titania
Bulletin of Materials Science
Washing fastness of dyed cotton fabrics by malachite green (MG) blended with nanosols composite of SiO 2 -TiO 2 has been significantly enhanced. The nanoparticulate inorganic sols were prepared by acidcatalyzed hydrolysis of titanium (IV) tetraisopropoxide (TTIP) and tetraethylortosilicate (TEOS) in ethanol at room temperature. The effect of silica on the characteristics of nanosols composite of TiO 2 -SiO 2 was studied. Nanosols morphology was examined by transmission electron microscope
... on microscope (TEM). The nanosols silica-titania composite showed homogeneous morphology of interconnected spheres of about 20-25 nm. Enhanced dye absorption was observed at nanosols with silica content. The reflection spectra of the samples before and after leaching test using sodium dodecyl sulphate were recorded. The results showed that embedding TiO 2 -SiO 2 and SiO 2 sols into the MG dye can improve the wash fastness by 40-95%. The highest improvement was obtained by SiO 2 -MG-coated cotton fabrics as well as composites of SiO 2 -TiO 2 -MG-dyed cotton fabrics at highest silica content. The MG-nanosols composite silica-titania dyed cotton fabric has also shown remarkable antibacterial activity over Staphylococcus aureus and Escherichia coli.