Browsing by Author "Faheem, Sajid"
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- ItemCharacterization and antibacterial property of Kapok fibers treated with chitosan/AgCl-TiO2 colloid(TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND, 2019-01-02) Hai, Abdul Moqeet; Ahmed, Mehboob; Afzal, Ali; Jabbar, Abdul; Faheem, SajidThe aim of this research is to investigate the antibacterial activity of Kapok fibers modified with AgCl/TiO2 and Chitosan colloid. A very simple, single-step (pad-dry-cure) method was used for the application of AgCl/TiO2 and Chitosan colloid on kapok fibers, the chemicals used are easily available. Different blend ratios of chitosan and AgCl/TiO2 colloid were applied to the bleached kapok fibers and antibacterial properties were assayed against gram positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. The treated kapok fibers were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). It was observed that the bacterial growth was significantly reduced in the samples which had a higher concentration of chitosan and AgCl/TiO2 colloid. However, a significant reduction in bacterial growth with the use of this colloid was observed.
- ItemFlame resistance behavior of cotton fabrics coated with bilayer assemblies of ammonium polyphosphate and casein(2019-03) Faheem, Sajid; Baheti, Vijay; Tunak, Maros; Wiener, Jakub; Militky, JiriThis research report discusses the intumescent flame resistance and physiological comfort of cotton fabrics after being coated with bilayer assemblies of different concentrations of ammonium polyphosphate (APP) and casein solutions. The flame resistance was investigated using horizontal flame propagation, cone calorimetry and thermo-gravimetric analysis, whereas physiological comfort was estimated in terms of air permeability, water vapor permeability and stiffness testing. From cone calorimetry results, the coated fabrics showed very slow combustion kinetics as the concentration of casein or APP was increased. Although, higher concentration of casein was found to produce higher char residue, but the physiological comfort properties were deteriorated beyond 5wt% casein. The images of burnt samples confirmed the formation of a distinct intumescence layer of char residue and it was also validated from the measurements of thermal conductivity of char residues. In this way, the presented work showed that the casein could perform number of functions such as catalyzed dehydration, accelerated charring and intumescent char formation in APP based intumescent systems.
- ItemFlame Retardancy, Physiological Comfort and Durability of Casein Treated Cotton Fabrics(2019-07-23) Faheem, Sajid; Baheti, Vijay; Nahid, Nazia; Tunak, Maros; Wiener, Jakub; Militký, JiříThe present work was aimed to develop the flame retardant textiles for prevention of second-degree burn injuries from low intensity heat flux accidents. The different concentration of casein suspension was applied on cotton fabrics and their thermo-oxidative properties, flame retardant behavior as well as physiological comfort were examined. From thermo gravimetric analysis, the percentage increase in char residue indicated improvement in thermo-oxidative properties. The maximum improvement in flame retardant behavior was found in case of 30 w/v % casein suspension due to higher production of thermally stable char. Their SEM micrographs also showed the formation of stronger and coherent char with presence of local intumescence. Furthermore, for estimating small differences in burn length and burn area, the flame propagation was studied in detail using the image analysis. The lower concentration of casein below 20 w/v % was found to provide adequate flame retardancy with acceptable physiological comfort and mechanical properties. Finally, the short term durability of casein treatment was verified under the effect of washing and ageing conditions.
- ItemIntumescent flame retardant bilayer coatings of casein and ammonium polyphosphate on cotton fabric(Fiber Society, 2018) Faheem, Sajid; Baheti,Vijay; Tunák, Maroš; Wiener, Jakub; Militký, JiříThe objective of present study was to investigate the effect of bilayer coating of different concentrations of ammonium polyphosphate (APP) and casein on thermo-oxidative properties, flame retardant behavior as well as thermal conductivity of char residues of cotton fabrics. Intumescent flame retardant coating, composed of cationic casein and anionic ammonium polyphosphate has been constructed on cotton fabric by bilayer coating. The flame retardant behavior was found to increase predominantly with increase of APP concentration than the casein concentration due to greater release of phosphoric acid and ammonia from APP. Whereas, the higher concentration of casein was found more advantageous to form the distinct layer of intumescent char formation, where cotton fabric samples coated with 15% casein and 7.5% APP contents produced maximum char of 44%.