Synthesis of TiO2-SiO2 colloid and its performance in reactive dyeing of cotton fabrics

Newly synthesized SiO2 surface treated TiO2 nanoparticles (TiO2-SiO2) were prepared, characterized and utilized in functional dyeing as combined reactive dyeing of cotton fabrics. Factors affecting the dyeing and functional properties of the treated fabric, concentration of TiO2-SiO2 and of reactive dye as well as dyeing regime were studied. The chemical and morphological structures of nano-upgraded cotton fabrics were characterized by ATR-FTIR spectroscopy and scanning electron microscopy. UV-blocking ability, coloration and comfortable behavior of cotton have been evaluated through ultraviolet protection factor, CIE L*a*b* color values and air permeability determinations, respectively. Incorporation of TiO2-SiO2 into the dyeing with reactive dyes brought about an outstanding UV protection functionality of the dyed fabrics even after 15 laundering cycles with a negligible negative impact on color and comfortable properties. Improvement or decrement in the UV protection, comfort, and dyeing properties is governed by the reactant concentrations and the dyeing temperature. (C) 2012 Elsevier Ltd. All rights reserved.