Progress in Color, Colorants and Coatings
Volume:16 Issue: 3, Summer 2023

The growth of microorganisms on textiles can reduce mechanical properties, color changing, and disease spreading. Hence, natural antibacterial agents have developed dramatically and are important in the textile industry. In this study, the role of pomegranate peels and walnut green husk extracts on the antibacterial, dyeing, and fastness properties of wool yarn treated with chitosan-Cu and chitosan-Ag nanoparticles (Ch-Cu NPs and Ch-Ag NPs) are investigated. It was found that pomegranate peel and walnut green husk extracts could increase the antibacterial activities (almost 100 %) of samples in lower concentrations (1 % o.w.f.) treated with Ch-Cu and Ch-Ag NPs. Furthermore, the durability of the antibacterial activity of dyed samples was acceptable after 10 repeated washing times. Ag and Cu on the wool samples provided varied shades, which can be related to form complexation/coordination between them and natural dyes. The obtained results clearly showed that the extracts of used natural dyes could be proposed as the green method for decreasing the consumption of Ch-NPs, consequently, the costs of antibacterial finishing. </em>

Nowadays, research on handmade carpet is developing. It is very important to protect dyed fibers by natural dyes in handwoven woolen carpets against harmful environmental bacteria.</em> In</em> this study, the effect of different nanoparticles on dyed woolen carpet has been investigated.</em> </em>Wool yarns were mordanted with alum 10 % and acetic</em> </em>acid 2 %</em> </em>and</em> </em>then dyed with 60 %</em> </em>walnut natural dyes. After dyeing, carpet was woven and finally was treatment in three steps with three types of particles (nano-silver, nano-titanium dioxide and nano-alumina oxide). SEM, FTIR, color value and color strength, self-cleaning, moisture absorption time, the size of the contact angle, </em>anti-odor property and</em> anti-bacterial activities of dyed wool carpet are investigated. The results showed that the hydrophilic properties of samples have been improved. SEM images indicated the presence of nanoparticles on samples. Also, antibacterial properties of samples against E. coli and S. aureus were very good evaluated. Moreover, Long-term static loading was applied on the sample to make the pile up before and after loading.</em>

A quenching study was reported for interacting a fluorescence naphthalimide derivative with graphene oxide (GO) as a quencher. 1,8-naphthalimide fluorophore with two amine functional side arms (NN2) was synthesized and characterized. Many different 1,8-naphthalimide fluorescence dye derivatives have been designed for fluorescence probe application. Fluorescence quenching-based platforms in nanoscale have extensively been used in sensing systems. Raman, FTIR, UV-Vis, and fluorescence spectroscopic techniques were used to study GO and NN2 characteristics and their photophysical and quenching mechanisms at different temperatures. The results indicated that graphene plays an effective quencher against the naphthalimide molecule, with quenching efficiently at 91 %. The Stern-Volmer analysis results show a mix of static and dynamic quenching mechanisms. The binding constant of the quencher and fluorophore and the number of binding sites have been reported. Thermodynamic parameters of their interaction were evaluated. The negative values of the ΔG confirm that the complexation process is spontaneous. Meanwhile, the positive entropy value confirms the favourable pathway process. </em>

Metal corrosion, in general, is a serious economic problem. One of the most effective ways to prevent corrosion on metal surfaces is to use corrosion inhibitors, especially green organics. Here, the effects of concentration, exposure time, and temperature on the antiproliferative ability of 4-aminoantipyrine derivative were investigated. The 4-aminoantipyrine derivative showed significant corrosion resistance to mild steel melting in a 1M hydrochloric acid environment, as observed from the weight loss method. At 303 K and a dose of 500 ppm, the maximum inhibitory efficacy of the 4-aminoantipyrine derivative was 96.1 %. Corrosion test results showed that the 4-aminoantipyrine derivative has an inhibitory effect of more than 88 % at the concentration of 400 ppm and inhibits corrosion through an adsorption mechanism. The inhibitory potency of the 4-aminoantipyrine derivative changed inversely with a long exposure time, while temperature affected it directly. The Langmuir model was used to control the physical and chemical adsorption of its 4-aminoantipyrine derivative as a corrosion inhibitor on metallic surfaces. Data from density functional theory simulations help bridge the gap between theoretical studies and experimental approaches. </em>

The engineered nanostructured electrode material is an important factor in enhancing the performance of supercapacitors. Herein, a facile procedure was reported for the electrosynthesis of MnCo2</sub>O4 </sub>nanosheets through one‑pot electrodeposition method. The obtained MnCo2</sub>O4</sub> nanosheets have been characterized using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and energy-dispersive X‑ray spectroscopy (EDX) techniques. </em>The results showed that MnCo2</sub>O4 </sub>nanosheets with multiple walls had been successfully prepared</em>. The e</em>lectrochemical evaluation revealed that the as‑prepared MnCo2</sub>O4</sub> electrode delivered a high specific capacitance of 1198 mF cm‑2</sup> at the current density of 1 mA cm‑2</sup> </em>and demonstrated outstanding cycling performance. </em>The binary nature of the MnCo2</sub>O4</sub> nanosheets, along with the </em>unique nanosheet architecture with accessible void spaces for the transfer of electrolyte ions and electrons, is responsible for these remarkable properties. </em>These results demonstrate that the present MnCo2</sub>O4 </sub>nanosheets with outstanding electrochemical properties can be considered as promising candidates for energy storage systems. </em>

Three organotin complexes were successfully produced in the presence of sodium hydroxide by the condensation reaction of cephalexin (ligand) and tri-organotin (IV) complexes. The complexes formed were given trigonal bipyramidal geometries based on spectrum measurements. These compounds were applied as additives (0.5 percent by weight) to reduce the photodegradation of polyvinyl chloride films (40 µm thickness) when exposed to ultraviolet light at a normal temperature (max = 313 at an intensity of light = 7.75 × 10-7</sup> ein dm-3</sup> S-1</sup>). The weight changes of films before and after irradiation can be applied to investigate the effectiveness of organotin (IV) complexes as photo stabilizers. After irradiation, the morphology of poly(vinyl chloride) studied by the microscope, atomic force microscopy, and scanning electron microscope was shown to be less damaged in the films containing additives. These additives are effective UV absorbers, hydrogen chloride scavengers, and peroxide quenchers. </em>