This work presents an ecofriendly method for dyeing synthetic fabrics with natural dyes using UV/ozone pretreatment to activate fiber and improve dyeability of polyester and nylon. Fabrics are pretreated with UV/ozone for different periods of time ranged from 5 min to 120 min. Effect of pretreatment on surface morphology was studied by scanning electron microscope (SEM). Mechanical behavior was studied by testing tensile strength and elongation percentage. Chemical modification of the surface was studied using attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR). Dyeability of the treated samples was investigated in terms of their colour strength expressed as K/s in addition to fastness to washing and light. This research showed the increment of the affinity of the studied synthetic fabrics towards curcumin and saffron natural dyes using ecofriendly technique.
The simultaneous reduction of NO and N 2 O has been investigated on Pt-based catalysts supported on c-Al 2 O 3 and perovskite materials (LaFeO 3). Particular attention has been paid to the catalyst resistance to thermal sintering processes occurring under reaction conditions at elevated temperature in the presence of oxygen and water. Bulk and surface modifications have been examined using appropriate physicochemical techniques (H 2-TPR, XPS, and HRTEM) and have been tentatively correlated to the catalytic performances in terms of activity and selectivity. It has been found that a significant particle growth occurs on 4 wt.% Pt/c-Al 2 O 3 having a strong detrimental effect on the conversion of N 2 O at high temperature. On the other hand, 4 wt.% Pt/LaFeO 3 exhibits a higher resistance to thermal sintering. Such a behaviour has been explained by the occurrence of strong metal/support interactions highlighted by high resolution TEM observations. The formation of epitaxially oriented Pt particles on the LaFeO 3 crystal lattice during thermal activation, still observable after thermal ageing would partly explain the best resistance of 4 wt.% Pt/LaFeO 3 to deactivation towards the conversion of N 2 O at high temperature. Hence, supported catalysts on LaFeO 3 with lower Pt loading were prepared. It has been finally found a striking enhancement of the catalytic performances, opening a new practical interest for minimising the noble metal loading.
In this study, we present a successful simple method for printing and finishing of polyester and cotton fabrics using gold and silver nanoparticles (Au-NPs and Ag-NPs, respectively) as stable, fast colorants and functional components.
This work aims to utilize selenium nanoparticles (Se-NPs) as a novel dyestuff, which endows wool fibers with an orange color because of their localized surface plasmon resonance. The color characteristics of dyed fibers were evaluated and analyzed. The color depth of the dyed fabrics under study was increased with the increase in Se content and dyeing temperature. The colored wool fabrics were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) and an X-ray diffraction (XRD) analysis. The results indicated that spherical Se-NPs with a spherical shape were consistently deposited onto the surface of wool fibers with good distribution. In addition, the influence of high temperature on the color characteristics and imparted functionalities of the dyed fabrics were also investigated. The obtained results showed that the proposed dyeing process is highly durable to washing after 10 cycles of washes, and the acquired functionalities, mainly antimicrobial activity and UV-blocking properties, were only marginally affected, maintaining an excellent fastness property.
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