The Use of New Technologies in Dyeing of Proteinous Fibers

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An Overview of the Past, Present and Future of Merinoization Activities in Sheep Breeds with Quality Wool Yield in Turkey and Previous Studies on the Wool Characteristics of the Turkish Merino (Karacabey Merino) Breed

The most important factor determining the quality of fleece to be obtained from a sheep is genetic capacity. From this point of view, it can be said that our domestic sheep breeds are meat or dairy sheep breeds. It can be said that the breed with the highest potential to obtain quality fleece in Turkey is Karacabey merino (Turkish merino). The two most critical parameters that determine the quality of a fleece are fineness and length. In order for a fleece to be usable in the worsted weaving industry, its fineness must be 24.94 microns and below, and its length must be longer than 8 cm. However, studies have shown that the percentage of Karacabey merino sheep with wool with a fineness value of less than 24 microns is very low. For this reason, it is thought that sheep breeds with high quality wool yield can be developed in our country with multidisciplinary projects to be carried out especially by textile engineering, zootechnology department of agricultural engineering, and veterinary faculties. In this review article, information is given about the history of merinoization in Turkey, our native merino breeds and previous studies on the fleece characteristics of the Karacabey merino breed. © 2022,Tekstil ve Muhendis. All Rights Reserved

Reducing steaming times in the printing of nylon/elastane blend fabrics via chemical modification

Nylon fibres are commonly used in blends with elastane. One of the problems encountered in the printing of nylon/elastane blend fabrics is the necessity of long steaming times for fixation, which causes an increase in energy consumption. In this study, the possibility of printing polyamide fabrics with 1:2 metal complex dyes for short steaming times was investigated. For this aim, laboratory and sample scale trials were performed to develop a method of chemically modifying fibres so that polyamide fabrics can be printed in short steaming times. Based on the results obtained in both trials, it was noticed that the steaming time for fixation could be reduced from 30 minutes to 15 minutes by printing with 1:2 metal complex dyes without causing a loss of printing yield and without affecting the fastness adversly in case of applying cationisation pretreatment with a modified quaternary polyalkylamine compound based product. © 2021, Institute of Biopolymers and Chemical Fibres. All rights reserved.3130834We would like to thank to TUBITAK for supporting this study within the 3130834 coded TEYDEB project. In addition, we are grateful to the Serhas Tekstil Company for giving us the opportunity to realise sample scale industrial printing trials

Production of Polyvinylpyrrolidone Nanowebs Containing Zinc Cyclohexane Mono Carboxylate via Electrospinning and Investigation of Antibacterial Efficiency

In this study, after the synthesis of zinc cyclohexane mono carboxylate, its chemical structure was analysed with FTIR and TGA. Then electrospun polyvinylpyrrolidone nanofibres containing zinc cyclohexane mono carboxylate were produced and antibacterial properties of the nanowebs obtained were investigated for their use in the textile field. When the FTIR results of the nanofibres containing different concentrations of zinc cyclohexane monocarbocylate are examined, an -OH peak similar to that of PVP fibres is noticed. These results clearly indicate that zinc cyclohexane monocarboxylate is included in PVP. When the TGA spectra of CHMCZn doped nanofibres at different ratios are examined, it is seen that they give more similar results than polyvinylprolidone nanofibres alone. According to the SEM-EDX analyses, it was observed that the fibre diameters obtained were in the range of 145-947 nm. On the other hand, antimicrobial activity against B. subtilis, S. aureus and E. coli strains was detected, regardless of the CHMCZn concentration

The self-consistent calculation of the edge states at quantum Hall effect (QHE) based Mach-Zehnder interferometers (MZI)

The spatial distribution of the incompressible edge states (IES) is obtained for a geometry which is topologically equivalent to an electronic Mach-Zehnder interferometer, taking into account the electron-electron interactions within a Hartree type self-consistent model. The magnetic field dependence of these IES is investigated and it is found that an interference pattern may be observed if two IES merge or come very close, near the quantum point contacts. Our calculations demonstrate that, being in a quantized Hall plateau does not guarantee observing the interference behavior.Comment: EP2DS-17 Proceedings, 6 Pages, 2 Figure

Determination of the color removal efficiency of laccase enzyme depending on dye class and chromophore

The aim of this article was to clarify which type of dye chromophores could be decolorized efficiently with the use of laccase enzyme. For this purpose, enzymatic degradation of different type of dye classes (4 reactive, 2 acid and 1 basic dye) having various chromophore groups was investigated by using commercial laccase from Cerrena unicolor. It was observed that the chromophore structure of dye is very important on enzymatic color removal efficiency. According to the experimental results, it was found that color removal efficiencies (20 mg/L initial dye) were 98.7% for RB220 (0.1 g/L enzyme after 6 h), 95.1% for RB19 (0.1 g/L enzyme after 48 h), 90.8% for AR42 (0.1 g/L enzyme after 48 h) while they were 60.9% for AR114 (0.25 g/L enzyme), 58.6% for RB21 (0.5 g/L enzyme), 39.7% for RR239 (0.25 g/L enzyme) even after seven days. As a result, it can be said that the highest decolorization rate was achieved for the reactive dye having formazan copper complex (RB220) chromophore. On the other hand, the enzymatic degradation of basic dye (BB9) was found to be rather difficult compared to the acid and reactive dyes used in this study and the maximum color removal was 42.8% after seven days