Effect of Silver Particle size on color and Antibacterial properties of silk and cotton Fabrics

Abstract

In this study silver nanoparticles with different particle sizes and hence colors were synthesized on silk and cotton fabrics through reduction of silver nitrate. Particle sizes of the silver colloids were measured by dynamic light scattering (DLS). The structure and properties of the treated fabrics were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and UV-Vis reflectance spectroscopy. Various characteristics of the treated fabrics including antibacterial activities against a Gram positive (Staphylococcus aureus) and a Gram negative (Escherichia coli) bacteria, color effect, wash and light fastness, water absorption, fabric rigidity, and UV blocking properties were also assessed. The results indicated that the treated fabrics displayed different colors in the presence of silver nanoparticles with different particle sizes and exhibited good and durable fastness properties. Also, the size of the silver particles had a tangible effect on antibacterial activity of treated fabrics and its antibacterial performance was improved by decreasing the size of particles. Moreover, this process imparted significantly UV blocking activity to fabric samples.

Producing colored cotton fabrics with functional properties by combining silver nanoparticles with nano titanium dioxide

“…The increase in the sodium borohydride concentration had a tangible effect on the color of the Ag/TiO 2 colloids, and the prepared colloids with 0.4, 1.4, and 1.6 ml of sodium borohydride exhibited yellow, blue and brown colors, respectively. In our previous study, the silver colloids with different colors were characterized and the effective diameters of the silver particles were measured to be 67.9, 96.1, and 214.4 nm for brown, blue, and yellow colloids, respectively (Jafari et al 2016). By increasing the amount of sodium borohydride, the size of the silver nanoparticles decreases.…”

“…Silver nanoparticle colloids with different colors were synthesized by Mirkin's method (Métraux and Mirkin 2005) as previously reported by our team (Jafari et al 2016). In a typical experimental procedure, 100 ml of silver nitrate (0.1 mM), 0.36 g of poly(vinylpyrrolidone), 3.6 m1 of tri-sodium citrate dehydrate (100 mM), and 0.8 ml of hydrogen peroxide were mixed for 10 min.…”

“…Improved antibacterial properties of the nanocomposites-treated fabrics can be attributed to the presence of silver nanoparticles at the surface of fabrics. Silver nanoparticles have the ability to anchor to the bacterial cell wall and subsequently penetrate it, thereby causing structural changes in the cell membrane like the permeability of the cell membrane and death of the cell (Jafari et al 2016). Figure 7 gives the transmission spectra of blank and treated cotton fabrics.…”

“…Recently, some studies have focused on the coloration of textiles using noble metal (silver and gold) nanoparticles as a novel class of colorant (Tang et al 2011(Tang et al , 2012(Tang et al , 2013(Tang et al , 2014(Tang et al , 2015aEmam et al 2014;Yao et al 2016;Rehan et al 2015;Jafari et al 2016). For example, Tang et al (2015a) colored bamboo fabrics with silver and gold nanoparticles and proved significant light fastness.…”

“…Rehan et al (2015) coated cotton and wool fabrics with silver nanoparticles and produced colored fabrics with good fastness properties. More recently, Jafari et al (2016) used silver nanoparticles with different sizes for coloration of silk and cotton fabrics. The treated fabrics exhibited different colors with durable fastness properties.…”