Preparation of Silver Nanoparticles Suitable for Textile Finishing Processes to Produce Textiles with Strong Antibacterial Properties against Different Bacteria Types

Abstract

This study describes the development of a preparation technique for silver nanoparticles useable as antimicrobial material which is especially useful for textile treatment to realize antimicrobial fabrics. The silver particles need to be prepared by reduction of AgNO 3 under moderate conditions and with a moderate and non-toxic reductive agent. Comparative investigations were carried out with silver particles prepared by a solvothermal process or with NaBH 4 as reductive agent.Particularly, suitable silver solutions are obtained by stabilizing the silver particles with polyvinylpyrollidone PVP of high molecular weight (M w ∼ 360000 g mol −1 ) and the use of the non-toxic reductive agents ascorbic acid and fructose. Under these conditions the diameters of the silver particles are in the range of 10 to 30 nm as determined by HR-TEM. The formation of elemental silver has been verified by transmission electron microscopy (TEM), X-ray diffraction (XRD) and optical spectroscopy. The properties of silver particle-containing liquids were investigated by using UV/Vis spectroscopy and dynamic light scattering. Further information on particle size and size distribution was gained through SEM investigations. The prepared solutions of silver nanoparticles can be applied easily onto textiles as liquid coating agents. All prepared textile samples exhibited a high antimicrobial activity against Escherichia coli. However, only few solutions containing silver particles of smaller size exhibit high antimicrobial activity also against other types of bacteria such as Staphylococcus aureus and Streptococcus pneumoniae. Because of this high antimicrobial potential gained with silver solutions prepared in a simple process without usage of toxic components, the developed materials offer a broad range of potential applications.

Hybrid sol-gel materials for realization of radiation protective coatings—a review with emphasis on UV protective materials

“…4. These spectra [54,55] show the transmission in the range of 220-1400 nm and illustrate the transmission for near infrared light in the range of 700-1400 nm. In this spectral range of near infrared light, the applied pure silica sol coating does not change the transmission behavior of the textile fabrics.…”

“…It is not to be expected that a sol-gel coating of several micrometer thickness can be used here. However, X-ray photons with smaller energies of 2-10 keV can be shielded to a certain extent by modified sol-gel coatings [54].…”

Polyvinylamine application for functionalization of polyethylene fiber materials

“…For testing their impact on viability, textile samples (squares of 5 mm edge length) were placed in sterile 96-multiwell cell culture plates together with 200 μl of bacterial suspension (diluted 1:250 in LB medium) per well and incubated for 3 h at 37°C, rotating at 120 rpm in an orbital incubator. Subsequent to treatment with the fabric samples, cellular viability was tested by measuring the reduction of methylthiazolyldiphenyltetrazolium bromide (MTT) as described elsewhere (Mahltig et al, 2011;Mahltig & Haase, 2012). Briefly, cells were incubated with 0.01% (w/v) MTT in culture medium, followed by lysis in isopropanol and determination of the absorption at 570 nm (reference wavelength 700 nm).…”

Microwave Assisted Conversion of an Amino Acid into a Fluorescent Solution

“…Nanoparticles made from metals or semi-metals are well known and intensively investigated during the last decades. [1][2][3][4][5][6][7][8] In comparison, the investigations of nanoparticles made from carbon started only recently. The fluorescence properties of carbon nanoparticles are discovered in 2004 during the investigation of carbon nanotubes.…”