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Pozycja Analysis of pressure parameters in orthopedic footwear for people suffering from diabetic foot syndrome(Wydawnictwo Politechniki Łódzkiej, 2022) Mikołajczyk, Zbigniew; Nowak, Iwona; Kuchyts, Yvan; Mikołajczyk-Solińska, MelaniaThe paper examines the anthropotechnical design of orthopedic footwear for patients with diabetic foot syndrome. A 3D distance knitted fabric is used for the shoe insert. For the purpose of the research, a 7 mm thick knitted fabric with transverse elasticity of 76 kPa was designed and produced on a doublebar warp knitting machine. With the use of the FreeMed Professional strain gauge mat, the pressures exerted by the foot on a „bare” walking surface and on the surface equipped with the distance knitted fabric were measured and compared, proving that in the latter case the unit pressure on the patient's foot decreased by 25%. The obtained measurements provide a good starting point for further research on the optimization of loads on the human foot, in case of various lower limbs diseases, including anatomical changes, as well as and in relation to people who are physically overloaded due to working in standing position or being in constant motion.Pozycja Antiviral properties of flame retardant bacterial nanocellulose modified with mordenite(Wydawnictwo Politechniki Łódzkiej, 2022) Melro, Liliana; Fernandes, Rui D.V.; Peixoto, Joaquim Jorge; Pinheiro, Inés; Ribeiro, Alice; Bouça, Verónica; Dourado, Fernando; Gama, Miguel; Padrão, Jorge; Zille, AndreaCurrent COVID-19 pandemic has underscored the requirement of antiviral properties in a plethora of textile applications. These include textiles used in home areas prone to fire such as kitchens, windows and electronic panel areas, but also in the automotive industry such interior textiles and hood insulation pad covers. Therefore, this work describes the characterization of a fully sustainable textile: bacterial nanocellulose, functionalized to achieve an impressive flame retardancy.Pozycja Bath exhaustion on halocromic dyes(Wydawnictwo Politechniki Łódzkiej, 2022) Martínez -González, Inés; Bou-Belda, Eva; Díaz-García, Pablo; Gisbert-Payá, Jaime; Bonet-Aracil, MarilésHalocromic dyes change theis colour with pH. There is a problem focused on the determination of the concentration for halochromic dyes attached to a fibre. This article studies the influence of halochromism on the absorbance measurement protocol of polyamide dyeing wastewater with Rose Bengal. For this purpose, two dyes are prepared at neutral and acid pH, and their concentrations are to be determined by absorbances of exhaustion and washing wastewaters. In addition, in order to check their fastness, a washing test is carried out on dyed fabrics and on fabrics post treated with a fixer.Pozycja Development of a plasma activated multifunctional polyester fabric using zinc oxide nanoparticles and citronella oil microcapsules(Wydawnictwo Politechniki Łódzkiej, 2022) Mehravani, Behnaz; Nicolau, Talita; Ribeiro, Ana Isabel; Parente, Joana F.; Sousa, Vânia I.; Tavares, Carlos J.; Padrão, Jorge; Zille, AndreaThere is a high demand for the development of textiles possessing multifunctional properties for outdoor, protective and health care applications. The coating of polyester (PES) textiles with metal nanoparticles and essential oils may act in a synergistic mode to obtain materials with improved antimicrobial and UV-protection properties. However, the lack of functional groups onto PES structure makes the adhesion of particles a difficult task. In this work, PES fabric was activated by dielectric barrier discharge (DBD) plasma treatment, and functionalized with zinc oxide nanoparticles (ZnO NPs) and poly (methyl methacrylate) (PMMA)-citronella microcapsules by dip-coating.Pozycja Halochromic properties of a 5-aminoimidazole-4-carboxamidrazone and its application to wool(Wydawnictwo Politechniki Łódzkiej, 2022) Ribeiro, Ana Isabel; Dantas, Daniela; Silva, Renata; Remião, Fernando; Pinto, Eugénia; Cerqueira, Fátima; Dias, Alice; Zille, AndreaThe application of stimuli-responsive molecules in textiles is an important field due to its potential in various areas of flexible sensing technology. In particular, pH plays an important role in nature, humans, and several processes. The pH of body fluids is one of the best indicators of disturbed health conditions. Thus, the development of textiles with halochromic properties has been increasingly attractive to display in real-time pH variations. Wool is one of the most important natural fibres because of its warmth and comfort. However, the dyeing process is costly and high energy-consuming. In this work, the halochromic properties under different buffers (acetate, phosphate, Britton-Robinson, artificial sweat, and artificial wound exudate) of a previously synthesized 5-aminoimidazole-4-carboxamidrazone were studied. Moreover, the first attempt to dye a wool knitted fabric with this molecule at a low temperature was performed. The developed material showed interesting halochromic properties (colourless in acidic pH and blue colour in the alkaline pH), even using artificial body fluids.Pozycja Sustainable and multifunctional natural fiber-based electric wire sheaths for smart textiles(Wydawnictwo Politechniki Łódzkiej, 2022) Mehravani, Behnaz; Padrão, Jorge; Fernandes, Rui D.V.; Nicolau, Talita; Alves, Cátia; Ribeiro, Ana I.; Peixoto, Joaquim Jorge; Carvalho, Hélder; Zille, AndreaEnvisioning the development of sustainable products for improvement of daily life quality, a cable-like composite using natural fibers was developed to be potentially used in smart textiles. Natural fibers such as jute and hemp were used along with Bekinox®VN yarn. Bekinox®VN is a stainless steel conductive yarn often used in intelligent textiles within a wide range of applications such as antistatic, power and signal transfer, thermal conductivity or even as a heat resistant sewing yarn. Furthermore, applying a chitosan coating on the surface of the sheath will confer antibacterial properties, thus preventing the colonization and proliferation of bacteria, as well as natural fiber degradation. The chitosan coating was applied by a pad dry method. Tests were performed to evaluate the mechanical, electrical and antimicrobial properties. The results displayed that the best tensile strength was obtained for hemp fabric followed by cable composite. The antimicrobial properties were improved with the coating of chitosan and demonstrating excellent results against Gram-positive and Gram-negative bacteria. Although chitosan reduces the mechanical strength of the sheath, it confers antibacterial activity, which not only will preserve the fiber in the structure but will also protect human skin against possible crosscontaminations.Pozycja The influence of polyamide fibres and knitted fabric structures on thermophysiological properties(Wydawnictwo Politechniki Łódzkiej, 2022) Arruda, Luisa M.; Moreira, Inês; Fangueiro, RaulThis study aims to analyse the influence of distinguished polyamide fibres knitted in different ways to improve the thermal physiological properties of fabrics used in clothing for bedridden patients. To this end, four distinct fibre compositions were, each one, knitted into four different structures, and this plan generated 16 samples. Structural characterization of the samples, permeability analyses, and Moisture Management tests were carried out. Was possible to conclude that some parameters such as filament dimension, fabric loop length, and how the yarns are knitted, have a direct influence on the thermal behaviour of knitted fabrics. The sample made of PA fibre 44/40 in a jersey fabric, presented the best results, due to its reduced thickness, superior loop length, and the use of a 40 multifilament.Pozycja Effect of tensile strength of lignocellulosic himalayan nettle fibers by chemical treatment(Wydawnictwo Politechniki Łódzkiej, 2022) Deepa, R.; Saravanan, K.; Kumaresan, K.; Satheeshkumar, D.The physical and chemical properties of Himalayan nettle fibers treated with sodium hydroxide and sodium chlorite solutions have been studied in this research. Nettle fibers are naturally derived, highstrength nettle yarn for the preparation of home textiles, handicrafts, and ropes. It is a high fiber-yielding plant that grows naturally in the Himalayan areas. In this study, nettle fiber samples were soaked in 4% sodium hydroxide (NaOH) and 1% sodium chlorite (NaClO2) solutions at a 100oC temperature for 90 minutes. The untreated nettle fibers were soaked in a 4% sodium hydroxide water solution at a 100oC for 60 minutes. The nettle fiber test samples were prepared and tested as stated in the ASTM standards. The average tensile strength of alkaline nettle fibers increases by upto 60% compared with untreated fiber. The mild alkali treatment increases tensile strength, cellulose content and decrease elongation break acts to be due to fiber extraction and separation of non-cellulosic materials such as hemicellulose, lignin, and pectin. Compared to untreated nettle fiber, the average young's modulus of sodium hydroxide-chlorite treated fiber was increased. Moisture sorption analysis, Fourier transform infrared spectroscopy (FTIR), single fiber tensile strength, and physical properties were used to evaluate the properties of untreated and treated nettle fibers.Pozycja Dyeing of cotton with madder using (bio)mordants: effects on fastness and UV protection properties(Wydawnictwo Politechniki Łódzkiej, 2022) Alves, Cátia; Fernandes, Marta; Rodrigues, Rui; Zille, AndreaThis work aimed at studying the dyeing of cotton fabrics with madder extract using two biomordants, quebracho tree extract (Schinopsis spp.) and laccase. Pre-treatment with quebracho increased the colour strength, washing and UV light fastness, and UV protection, while laccase only shows an increase in the UV light fastness. The application of biomordants together with the metal ones (aluminium or iron salts) led to an improved UV light fastness compared to the samples mordanted only with metal salts. Meanwhile, although the colour strength was lower than in the metal-mordanted samples, greater UV protection factors were obtained in the samples pre-treated with quebracho or laccase and iron salt.Pozycja Exploration and practice of textile and clothing training base construction(Wydawnictwo Politechniki Łódzkiej, 2022) Zhang, Li-feng; Chen, Gui-cuiIn order to improve vocational education level of local economy. The textile and clothing training base under Yueda Textile Industry Institute mode was built. The basic situation and construction ideas of the base were sorted out, the construction contents of the productive practical training base were established, the main measures of the base construction were defined, and the functions of the base in the aspects of practical training topics, skill appraisal, talent cultivation and production practice were realized. Further improved the technical promotion ability of the training base to serve the teachers and students, enterprise employed and opened to the whole society. The construction of an open training base for textile and garment skills would provide talent support and technical services for the development of modern textile and garment industry.