Abstract
To explore the combination of silver nanoparticles (Ag NPs) prepared in a green manner with cotton fabrics and the washing durability of the fabric after the combination. In this paper, the natural material, honeysuckle extract, was used as a reducing agent to prepare the Ag NPs’ solution. The structure and size of Ag NPs were analyzed using ultraviolet–visible spectrophotometry (UV–vis), transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray powder diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy characterization. The results showed that Ag+ was successfully reduced to Ag0 by the honeysuckle extract, the particle size was about 10.59 nm, and the potential was −42.9 mV, so it had strong electrostatic repulsion and good stability. Meanwhile, it was found that the synthesized Ag NPs were well coated by the honeysuckle extract, so they would not aggregate. Then, the cotton fabric was finished with Ag NPs’ solution by the dipping method using a complex of polymaleic acid (PMA) and citric acid (CA) as a cross-linking agent to fix Ag NPs on the cotton fabric. The structures of cotton fabrics before and after finishing were characterized using FT-IR, scanning electron microscopy (SEM), XRD, X-ray photoelectron spectroscopy (XPS), and thermogravimetric (TG) analysis, and the multifunctional properties of the finished cotton fabrics were explored by measuring the antibacterial rate, the wrinkle recovery angle (WRA), and the UV protection factor (UPF) value. The results show that Ag NPs were successfully loaded onto cotton fabric, and the PMA + CA compound was successfully cross-linked to the fabric. The cross-linked Ag NPs’ cotton fiber was rougher than that before cross-linking, and its TG stability improved. The PMA + CA compound fixed Ag NPs on the cotton fabric through chemical bonds, so it still had a 99% antibacterial effect against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) after 50 washings. Compared with unfinished cotton fabric, the UPF value and WRA of the cross-linked Ag NPs cotton increased by 34.09 and 98°, respectively, and its color did not change much.
Highlights
Cotton fabric is a type of natural porous fabric with good wearing properties, such as moisture absorption, breathability, and skin-friendliness [1,2]
The absorption peak at 400–450 nm is the basis of the wavelength of Ag NPs [22], it forms the surface plasmon resonance effect (SPR) absorption phenomenon of spherical or nearly spherical Ag NPs [23,24], so the test first adopted the method of observing the color change of the solution and the UV– vis spectrum of the test solution to determine preliminarily the generation of Ag NPs
It can be seen that the color of the solution has changed from light yellow before the reaction to reddish-brown after the reaction, and the ultraviolet–visible spectrophotometry (UV–vis) spectrum shows an obvious symmetrical absorption peak at about 418 nm, according to the SPR effect, it is proved that Ag NPs can be obtained by reducing silver nitrate with honeysuckle extract under appropriate conditions
Summary
Cotton fabric is a type of natural porous fabric with good wearing properties, such as moisture absorption, breathability, and skin-friendliness [1,2]. Cotton fabrics have problems such as being easy to wet, easy to stain with oil, and easy to wrinkle, and with poor UV resistance performance. Bacteria are prone to breed on the surface of wet and oily cotton fabrics, leading to an increased risk of illness for users. Wrinkling is one of the most important shortcomings of cotton fabrics. Cotton fabrics can promote the internal movement of polymer chains under moist conditions, thereby removing the hydrogen bonds existing in the cellulose structure. Cotton fabrics have poor UV blocking performance, which accelerates the skin aging of users and even induces skin cancer, which will bring hidden dangers to the health of users. The research and development of cotton-based textiles with long-term antibacterial properties and other functions is important
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