No abstract

No abstract

Herein, an approach was carried out toward in situ synthesis of chitosan-mediated silver (Ag) nanoparticles (AgNPs) on merino wool fabrics (MWFs) and its utilization as colored textile, antibacterial material and removable substrate after toxic dye reduction. The investigation on the as-produced products (AgNPs@MWFs) indicates that AgNPs were successfully assembled on the MWF surface through efficient interaction between the wool and chitosan terminals with nanoparticles. The AgNPs@MWFs revealed three primary colors (red, yellow and blue) with a brilliant shade due to the localized surface plasmon resonance properties of metal nanoparticles. The colorfastness and color strength (K/S) values were found to be as significant as those of traditional dyes. The tensile properties of the MWFs, such as strength and elongation at break, were measured before and after in situ synthesis of AgNPs and were found improved compared with those of the control samples. The antibacterial performance was also noticed to be excellent with ∼99% bacterial reduction after five consecutive standard washes. Afterward, AgNPs@MWFs coupled with sodium borohydride (NaBH4) were used for azo-containing wastewater treatment. Higher than 90% azo-dye degradation by 30 min was found, which was six times faster than that of the control sample.

The structure and bleaching/dyeing behaviour of hair sampled from people of various ages were investigated to provide guidance for wig-making. Hair surface and cross-sectional morphology were investigated by scanning electron microscopy, whereas the number density and size of melanin granules were evaluated by transmission electron microscopy. The suitability of hair for dyeing was determined by the trade-off between the fracture strength and lightness of bleached samples. Hair collected from 26-year-olds showed the highest number density and the lowest size of melanin granules, thus featuring the lowest mechanical strength reduction and the highest lightness increase after bleaching. The optimal bleaching conditions for such hair were identified as bleaching time = 80 minutes, hydrogen peroxide (H 2 O 2 ) concentration = 60 mL/L, and bleaching temperature = 75°C. Considering its resilience to damage and favourable dyeing behaviour, hair sampled from 26-year-olds was concluded to be most suitable for wig-making. Thus, the present research provides guidance for the selection of raw materials for wig-making.

PurposeFunctionalization of organic cotton fabrics (OCFs) by in situ deposition of chitosan reduced-stabilized silver nanoparticles (AgNPs). No other toxic chemicals used to warrant an ecofriendly synthesis protocol. Human toxicity of silver systematically avoided to use as textile clothing. Primary colors (nearly-red, yellow and blue) were imparted on OCFs via localized surface plasmon resonance (LSPR) of AgNPs. Decent mechanical properties and laundering durability in terms of antibacterial/fastness test improved mechanical properties.Design/methodology/approachSilver nanoparticles can be synthesized by using silver nitrate along with commercially available chitosan. Due to the surface LSPR property of silver nanoparticles, it exhibits versatile colors depending on the synthesizing procedures. The coloration occurs due to the electrostatic interaction between the AgNPs and chitosan-treated OCF. The nanotreated fabrics provide excellent mechanical properties with improved antibacterial effects.FindingsX-ray fluorescence (XRF) analysis quantifies the developed materials in the substrates. Scanning electron microscopy (SEM) characterization indicates the appearance and morphologies of silver nanoparticles into the fabric surface after the coloration process. It proves that the treated cotton knit fabric exhibits the LSPR optical features of AgNPs. The antibacterial and mechanical properties confirm the improved functionality of products.Originality/valueImproved mechanical properties, antibacterial performances and coloration effects on organic cotton substrates in terms of chitosan-mediated nanosilver are not yet studied.