This paper reports a novel route for the coloration of polyester fabric with green synthesized silver nanoparticles (G-AgNPs@PET) using chitosan as a natural eco-friendly reductant. The formation of AgNPs was confirmed by UV-visible spectroscopy. The morphologies and average particles size of G-AgNPs was investigated by transmission electron microscope (TEM) analysis. The uniform deposition of G-AgNPs on the PET fabric surface was confirmed with scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. The thermal properties were investigated using a thermogravimetric analyzer (TGA). The coloration and fastness properties of fabric were found to be significantly improved, a result related to the surface plasmon resonance of G-AgNPs. The antibacterial properties of fabric were also found to be excellent as more than 80% bacterial reduction was noticed even after 10 washing cycles. Overall, the proposed coating process using green nanoparticles can contribute to low-cost production of sustainable textiles.

Abstract:In this study, a novel functionalization approach has been addressed by using sodium alginate (Na-Alg) assisted green silver nanoparticles (AgNPs) on traditional "Rajshahi silk" fabric via an exhaustive method. The synthesized nanoparticles and coated silk fabrics were characterized by different techniques, including ultraviolet-visible spectroscopy (UV-vis spectra), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FT-IR), which demonstrated that AgNPs with an average size of 6-10 nm were consistently deposited in the fabric surface under optimized conditions (i.e., pH 4, temperature 40 • C, and time 40 min). The silk fabrics treated with AgNPs showed improved colorimetric values and color fastness properties. Moreover, the UV-protection ability and antibacterial activity, as well as other physical properties-including tensile properties, the crease recovery angle, bending behavior, the yellowness index, and wettability (surface contact angle) of the AgNPs-coated silk were distinctly augmented. Therefore, green AgNPs-coated traditional silk with multifunctional properties has high potential in the textile industry.

In this study, for the first time wool fabric was functionalized through green based synthesized silver nanoparticles (AgNPs) employing sodium alginate as reducing agent. The diffusion of AgNPs into wool surface as well as wool polymer system seems to be dependent on both physical and chemical interactions. The resulting products were characterized with scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) spectra, X-ray diffraction (XRD), Thermogravimetric analysis (TGA), and UV-vis absorbance. The results specified that AgNPs were successfully assembled on the wool surface when the liquor pH and temperature of the application medium was adjusted to 4 and 45 o C, respectively for 2 hours. This experiment also indicates that the wool fabric with Ag-NPs shows obvious multifunctional action because of the presence of the Ag-NPs. The treated wool fabrics exhibit optimistic colors due to the localized surface plasmon resonance (SPR) of Ag-NPs. The use of this technique to treat wool fabric may lead to new coloration technique and other functional improvement.

Rationally constructing low-cost, high-efficiency, and durable electrocatalysts toward the hydrogen evolution reaction at large current densities is imperative for water splitting, especially for large-scale industrial applications. Herein, a hierarchical core–shell NiP2@MoO2/Co­(Ni)­MoO4 cuboid array electrode with superhydrophilic/superaerophobic properties is successfully fabricated and the formation mechanism of the core–shell structure is systematically investigated. Through an in situ partially converted gas–solid reaction during the phosphating process, Ni and Co elements are leached and rearranged to form NiP2 particles and amorphous CoO as the shell layer and the inner undecomposed Co­(Ni)­MoO4 crystals serve as the core layer. Because of its seamless core–shell structure and superhydrophilicity/superaerophobicity of hierarchical cuboid arrays, NiP2@MoO2/Co­(Ni)­MoO4 exhibits superior HER activity in 1 M KOH with only an overpotential of 297 mV to deliver 1000 mA cm–2 and can work steadily for 650 h at 200 mA cm–2. Remarkably, when coupled with NiFe LDH for overall water splitting, it can drive an AA battery with an ultralow cell voltage of 1.49 V to deliver 10 mA cm–2. This work sheds new light on designing large-current-density efficient HER electrocatalysts for large-scale industrial applications.