Radic N.,Masaryk University |
Obradovic B.M.,University of Belgrade |
Kostic M.,University of Belgrade |
Dojcinovic B.,Serbian Institute of Chemistry |
And 4 more authors.
Plasma Chemistry and Plasma Processing | Year: 2013
The aim of this study was to examine and compare the potentials of two different ambient air plasma treatments: volume dielectric barrier discharge and diffuse coplanar surface barrier discharge, for the activation of polypropylene (PP) nonwovens surface. This was done in order to enhance the deposition of gold nanoparticles (AuNPs) onto PP surface. AuNPs were attached onto PP surface from colloidal solution prepared without stabilizers. Scanning electron microscopy, atomic force microscopy, attenuated total reflection-Fourier transform infrared spectroscopy, water absorption, and AuNPs uptake were used to assess the surface changes due to the plasma treatment, and to evaluate the durability of the achieved treatment effects. Finally, as a very important aspiration of the research, antibacterial activity of AuNPs loaded PP nonwovens against pathogens Staphylococcus aureus and Escherichia coli was evaluated in vitro. The plasma modified PP nonwovens have highly improved wetting and sorption properties. The PP nonwovens loaded with 17-62 mg/kg AuNPs exhibit antibacterial activity against tested pathogens. Surprisingly, this activity was enhanced by the first sample rinsing. © Springer Science+Business Media, LLC 2012.
Benesovsky P.,Textile Testing Institute
Proceedings of the 3rd International Conference on Advanced Materials and Systems, ICAMS 2010 | Year: 2010
In recent years, antibacterially treated textile products became very popular and many producers announce presence of antibacterial and/or antifungal finishings in their products (underwear, socks, shoes, beddings, upholstery etc). Unfortunately, consumers are only able to determine antibacterial activity subjectively, and many manufacturers abuse this by stating that their product is antibacterial, when it's not true. In order to correctly check whether textile product is antibacterial or not, many different standards for determination of antibacterial activity were created in the past. Credible producers of antibacterially treated textile product should always support their marketing by results of some of above mentioned tests, provided by accredited laboratory. Determination of antibacterial activity is always based on two basic principles: agar plate tests (qualitative) and dynamic tests (quantitative). Both those principles are completely different and give different level of information about tested textiles. Even different methods utilizing only one of those principles are non-comparable, because they differ in certain testing conditions like used bacteria type and their concentration, shape of the sample and the way how to express results of tests. Knowledge of basic principles of microbiological measurements can help non-microbiologist textile researchers in better understanding of antibacterial activity tests results, frequently published in literature. This contribution is an overview of different methods for determination of antibacterial activity of textiles and, especially, meaning and interpretation of their results, which is absolutely crucial in considering of real effect of finishing.
Vorac J.,Masaryk University |
Stork V.,Textile Testing Institute |
Saul P.,Masaryk University |
Gancarcik T.,Masaryk University
Indian Journal of Fibre and Textile Research | Year: 2015
In this work, a simple method for testing the felting propensity of carded top prepared from chemically treated, short and thick animal hairs, together with the necessary devices has been developed. Similar to the Aachen felting test, external force is applied to the wet sample of the fibres until felting occurs. The felting propensity is then determined from the dimensions of the resulting felted body. The main difference is that the sample is prevented from disintegration during the procedure that usually occurs, when a standard Aachen test is applied. © 2015, National Institute of Science Communication and Information Resources (NISCAIR). All right reserved.
Poli R.,University of Bergamo |
Poli R.,University of Twente |
Colleoni C.,University of Bergamo |
Calvimontes A.,Leibniz Institute of Polymer Research |
And 3 more authors.
Journal of Sol-Gel Science and Technology | Year: 2015
In the present study, a possibility to realize a transparent sol by zinc-based precursors in a neutral medium without acidic or alkaline catalyst was investigated. Moreover, to study the influence of an inorganic–organic hybrid polymer on the proposed antibacterial finishing, the Zn-based sol was mixed with 3-glycidoxypropyltrimethoxysilane (GPTMS), a hybrid sol–gel precursor, to produce zinc-containing silica coatings on the cotton fibres. An optimization of functionalization process parameters was performed by monitoring survival rate of Escherichia coli bacteria. Finally, selected finishes were tested in respect to their antibacterial activity using potential pathogenic bacteria Staphylococcus aureus and Klebsiella pneumoniae. Sol–gel synthesized cotton finishes based on nano-Zn acetate without and with GPTMS showed larger bactericidal and bacteriostatic activities. The both types of finishes also show hydrophobic effect within the first eliminates the hydrophobicity effect and reduces antibacterial activity. The results are very promising, since the antibacterial activity of cotton is comparably high and the finishing procedure is cheap and can be easily performed. © 2014, Springer Science+Business Media New York.
Sperova M.,Brno University of Technology |
Nasadil P.,Textile Testing Institute |
Prusova A.,Brno University of Technology |
Kucerik J.,Brno University of Technology |
Kucerik J.,University of Koblenz-Landau
Journal of Thermal Analysis and Calorimetry | Year: 2012
The degree of polymerization is one of the main parameters reflecting cellulose ageing. Viscometry is a method frequently used for determination of cellulose fibers polymerization degree, however, sample preparation and viscosity measurement are demanding, time consuming and do not provide reproducible results. In this study, the relationship between polymerization degree of cellulose fibers obtained by viscosity measurement and their degradation parameters obtained by thermal analysis were investigated. Differential scanning calorimetry provided values of effective combustion heat and thermogravimetry (TG) was used for the determination of temperatures and associated mass losses during the cellulose degradation. Effective combustion heat did not show any correlation with degree of polymerization of investigated cotton fabrics. In contrast, results from TG suggested several promising nonlinear correlations which could be used as a hint to develop a method useful for quick determination of cotton fabrics polymerization degree. The most promising correlations with cellulose polymerization degree were found for both rates of thermal and thermo-oxidative degradations. © 2012 Akadémiai Kiadó, Budapest, Hungary.