Opracowanie powłoki do inkorporacji korzystnych zarodników na tekstyliach szpitalnych

Hospital-acquired infections are a growing problem in hospitalized patient safety. and hospital textiles are reported as a significant source of these nosocomial pathogen. Contact with these textiles leads most often to the contamination and cross-contamination of the hospitalized patient and hospital staff. However, the common antimicrobial agents used in the production of antimicrobial textiles are proving to be a concern in terms of toxicity and antimicrobial resistance. Bacillus spores can be a good solution to combat pathogenic bacteria. In the present study, Bacillus spores were used in the coating of polyester fabrics. Afterwards the growth and viability of the beneficial bacteria applied on fabrics were monitored using the agar plate method. Besides this, the applicability to the fabric was evaluated on the basis of contact angle measurements, abrasion resistance and tensile tests. Major findings included that it is possible to incorporate Bacillus spores in coated fabrics and these can behave like q reservoir for beneficial bacteria.Zakażenia szpitalne stanowią coraz większy problem w procesie hospitalizacji pacjentów. Tekstylia szpitalne są istotnym źródłem patogenów szpitalnych. Kontakt z tymi tekstyliami prowadzi najczęściej do zanieczyszczenia i zanieczyszczenia krzyżowego hospitalizowanego pacjenta i personelu szpitalnego. Jednakże powszechnie stosowane środki przeciwdrobnoustrojowe stosowane w produkcji tekstyliów przeciwbakteryjnych okazują się nie spełniać oczekiwań pod względem toksyczności i oporności na środki przeciwdrobnoustrojowe. Zarodniki Bacillus mogą być dobrym rozwiązaniem w walce z patogennymi bakteriami. W badaniu do powlekania tkanin poliestrowych zastosowano zarodniki Bacillus. Następnie monitorowano wzrost i żywotność korzystnych bakterii na tekstyliach za pomocą metody płytek agarowych. Poza tym wykonano pomiary kąta zwilżania, odporności na ścieranie i próby rozciągania. Stwierdzono, że zastosowanie zarodników Bacillus do powlekania tekstyliów szpitalnych daje zadowalające efekty

Simulation of an industrial scale scCO2 beam dyeing process

An industrial dyeing process in supercritical carbon dioxide has been modelled with computational fluid dynamics using Ansys Fluent software. In order to investigate the distribution of the dye carrier fluid, the flow resistance of the fabric has been accurately characterised. For this purpose, in the first part of the work a plain-woven fabric geometry was created in the open software Tex-Gen and modelled in Ansys Fluent to predict the permeation of fluid through the pores of the fabric material and to estimate the relationship between local fluid velocity and pressure drop. The second part of the study focused on evaluating the influence of beam structure, inlet flow rate, fabric height on the fluid flow through the fabric, which must be uniform to achieve a homogeneous level of dyeing. From the simulations the main obstacle to achieving a uniform flow velocity in the fabric is the pressure rise that occurs in the beam and creates a slight difference in permeation velocity between the two axial ends of the fabric; other disturbances, such as the effect of the perforated structure of the beam, are usually minor. Due to the low viscosity of supercritical carbon dioxide, inertial losses predominate over viscous losses in the porous medium. This means that approaches based only on the permeability of the fabric and the application of Darcy's law are inadequate to correctly predict the response of a dyeing unit when using carbon dioxide

Electromechanical properties of polyamide/lycra fabric treated with PEDOT:PSS

One of the challenges in smart textiles is to develop suitable multifunctional materials that can address simultaneously several characteristics such as durability, stretchability, lightweight, and conductivity. Conductive polymers which showed success in different technological fields like polymer solar cells and light emitting diodes are promising in many smart textile applications. In this work, we treated a common polyamide/lycra knitted fabric with PEDOT:PSS for stretchable e-textiles. PEDOT:PSS, with DMSO as a conductivity enhancer and different ratios of water-based polyurethane dispersions as a binder, was applied to the fabric with simple immersion and coating applications. The effect of different application methods and binder ratio on the surface resistance of the fabric was monitored with four point probe electrical surface resistance measurement systems. Samples prepared by immersion technique are more uniform and have higher conductivity than those prepared by a coating technique. SEM images showed that PEDOT:PSS is incorporated into the structure in the immersion method while in the coating it is majorly present on the surface of the fabric. The tensile measurement showed that the acidic PEDOT:PSS and polyurethane dispersion coating has no adverse effect on the tensile strength of the fabric. The coated samples can be stretched up to 700% while still reasonably conductive. The resistance increases only by a small amount when samples were stretched cyclically by stretching 100%. Generally, samples prepared by the immersion method maintained better conductivity while stretching than those by a coating method. The washing fastness of the samples was also assessed