In recent years, zinc oxide nano particles coating on textiles such as polyester is considered because of UV blocking and self-cleaning properties. Alkaline hydrolysis of polyester is a method in textile industry for surface treatment in large scale to enhance wettability. In the present work, polyester fabric was treated with sodium hydroxide, then was coated with ZnO nano particles, and also polyester fabric was treated with sodium hydroxide and ZnO nano particles at the same time. The bending length, water adsorption time, bactericidal properties, atomic absorption spectroscopy, and self-cleaning effect were measured according to the standard methods. Scanning electron microscopy and Fourier transform infrared spectroscopy analysis were used for the study of surface morphology and surface chemical bonding. The results demonstrated that increasing of zinc oxide nano particles concentration increased bending length, water adsorption time, antibacterial and self-cleaning effect. Comparing with pre-alkaline and simultaneous alkali treatment showed that pre-alkaline-treated fabric had more zinc oxide nano particles, therefore more self-cleaning and bactericidal effect. The scanning electron microscopy of alkaline-treated polyester fabric showed surface hydrolysis and nano-particles on the surface of polyester, and Fourier transform infrared spectroscopy spectroscopy indicated chemical bonding.
In the present study, cotton fabric was exposed to laser exposure at different energy levels and then the silver nanoparticles were coated on untreated and laser treated cotton fabrics. Methylene blue dye was used to detect the presence of carboxylic acid groups (-COO−) on laser treated cotton and the dye absorption results were determined spectrophotometrically. ICP-OES (Inductively Coupled Plasma Optical Emission Spectroscopy) analysis and antibacterial tests were carried out to investigate the silver ion content and bactericidal properties of silver nanoparticles on cotton fabrics. Infrared spectroscopy (FTIR/ATR) analysis and scanning electron microscopy (SEM) were used to identify chemical changes and to study the morphology of the surface of the fibers. EDAX (Energy Dispersive X-ray Spectroscopy) analysis was calculated for SEM micrographs. The results showed according to the higher uptake of methylene blue dye that the negative charge of the carboxylic acid groups had been created by laser treatment. Although the FTIR spectroscopy results did not show an increase in carboxylic acid groups, the cationic dye absorption increased. The durability of the Ag+ ion particles on repeated laundered laser treated cotton was proven by antibacterial and ICP tests, particularly when the laser energy was increased.
The present study proposes new conditions for achieving the aged‐look effect of denim. Indigo dyed cotton fabrics were treated by corona discharge at different power levels and number of passages. Colorimetric parameters of corona treatment were assessed by the CIE L*a*b* colorimetric system and the pH and colour fastness of samples were tested. The surfaces of dyed samples were studied by scanning electron microscopy and Fourier Transform–infrared/attenuated total reflectance (FTIR/ATR) analysis. Under the same conditions of corona treatment, the faded‐look effect was reduced as the depth of dyeing was increased. Increasing the power and the number of passages increases L* and b* and decreases a* values. This indicates that samples become lighter and yellower but soaping can reduce yellowness. FTIR/ATR results show that indigo dye oxidises, and isatin and anthranilic acid are produced. The pH levels of corona‐treated samples reduce as the power and number of passages increase. This acidification is in agreement with the results of FTIR/ATR analysis.
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