In-Situ Functionalization of Cotton Fabrics with Polydopamine and Silver Nanoparticles for Multifunctional Applications

This study presents a sustainable approach to enhance cotton fabrics with multifunctional properties by in-situ functionalization using polydopamine (PDA) coating followed by the deposition of silver nanoparticles (AgNPs) through a self-reduction process. Polydopamine was chosen for its excellent adhesive and reductive properties, facilitating the uniform attachment of silver nanoparticles on the fabric surface. The functionalized fabrics were thoroughly characterized using FTIR, Raman spectroscopy, SEM, EDS, TGA, contact angle measurements, and XRD, confirming the successful integration of PDA and AgNPs. The modified cotton fabrics demonstrated 100% antibacterial activity against Staphylococcus aureus and achieved a water contact angle of approximately 131°, indicating enhanced hydrophobicity. Thermal stability was also improved, with a 15% increase in ash content at 600°C. This dual-functional coating approach provides an effective means to develop antibacterial, water-resistant, and thermally more stable textile materials, offering potential applications in protective clothing, and other functional fabric domains.

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Polydopamine nanocoating to use surface functionalization of polypropylene fabrics with a closed structure

In this study, an experimental investigation was conducted to explore polydopamine (PDA) nano coating to use surface functionalization of polypropylene (PP) fabrics with a closed structure. Nano coatings were made on polypropylene nonwoven fabric with the oxygen-induced polymerization method of dopamine (DA) in six different times. Uncoated control samples, coated samples and washed samples after coating were compared. A change in the solution towards dark brown-black color was observed during the experimental as the reaction time increased. Based on this finding, spectrophotometric measurements of samples were made. The lowest lightness and highest color strength values were observed in fabric coated for 32 hours. In before and after washing SEM images, the formed nano coating could be easily seen on this fabric (32 h). The nitrogen ratio indicating the presence of polydopamine was detected as 17.05%. After washing, it was observed that this high percentage decreased up to 1.35% but the nitrogen element was distributed homogeneously on the fabric surfaces from EDX mapping. FTIR analysis results confirmed that the PDA coating formed a bond with the polypropylene fabric and that these bonds continued after washing. Differently from uncoated fabric, extra bands and signals were observed in two different regions on the FTIR graph due to polydopamine. The results presented here may facilitate improvements in the surface activation of PP fabrics, which have a more closed structure for functionalization.

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The Evaluation of Uster Hairiness Results with an Image Analysis Approach

In this study, the images of the yarns were taken using a stereomicroscope. MATLAB software was used in image processing studies. The recommended image acquisition and processing steps in previous studies were followed, and the obtained results from textural parameters of images were compared with the results of Uster H and sh. The highest correlation in Uster H hairiness was obtained in the entropy textural parameter of the Sobel technique. The highest correlation in Uster sh hairiness was obtained in the mean of matrix elements (mean2) from the textural parameters in the Sobel technique. In general, higher correlation results were found in Uster sh than in Uster H. It has been observed that the Uster H results have deficiencies in determining the hairiness of dyed yarns. The different from the literature, this study presents that among the hairiness parameters, Uster sh shows the values closest to the real.

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Seçilmiş İpliklerde Zweigle İplik Tüylülüğü Sonuçlarına Farklı Test Hızlarının Etkisi

ÖZET: Bu çalışmada, Zweigle G657 cihazında iplik tüylülüğü sonuçlarına farklı test hızlarının etkisi araştırılmıştır. Ölçümler, cihazda seçenek olarak sunulan 25 m/dk, 50 m/dk, 100 m/dk ve 400 m/dk olmak üzere dört farklı test hızında gerçekleştirilmiştir. Test hızının etkisi SPSS programı kullanılarak istatistiki olarak incelenmiştir. İplik tüylülüğü sonuçları üzerinde, test hızındaki değişimin direkt olarak etkili olduğu görülmüştür. Tüylerin sınıflandırılmasında 10 mm’ye kadar, test hızları arasındaki farkın önemli seviyede olduğu görülmüştür. Aralarındaki bu farklılıklar 10 mm’den sonra önemsiz düzeye gelmiştir. Test hızı arttıkça ipliğin S3 tüylülük değerlerinde genel olarak bir artış eğilimi gözlenmiştir. Ancak bu çalışmada literatürden farklı olarak, çalışma için seçilen farklı yapıdaki ipliklerde farklı sonuçlarda elde edilmiştir. Farklı hızlarda elde edilen sonuçların karşılaştırma amaçlı kullanılmasının doğru olmayacağı net olarak görülmektedir. Yeni versiyon cihazlarda daha yüksek test hızlarına çıkma eğilimi bulunmaktadır. Bu nedenle, S3 tüylülüğü bilgisi verilirken, hangi cihazda ve hangi test hızında ölçüldüğü bilgisinin verilmesi gerektiği çıkarımı yapılmıştır.

The Effect of Different Test Speed on Zweigle Yarn Hairiness Results in Selected Yarns

ABSTRACT: In this study, the effect of different test speeds on yarn hairiness results in the Zweigle G657 device was investigated. Measurements were carried out at four different test speeds of 25 m/min, 50 m/min, 100 m/min and 400 m/min, which are available as options on the device. The effect of test speed was analyzed statistically using the SPSS program. It has been seen that the change in test speed has a direct effect on the yarn hairiness results. It has been observed that the difference between test speeds up to hairs in 10 mm in the classification of hair numbers is significant. These differences between them became insignificant after hairs in 10 mm. It can be generally said that an increasing trend was observed in the yarn S3 hairiness values as the test speed increased. However, different results were obtained in the yarns of different structures selected for the study different from the literature. It is clearly seen that it would not be appropriate to use the obtained results from different speeds for various comparisons. There is a tendency for higher test speeds on newer version devices. For this reason, it has been deduced that it is necessary to give the information on which device and at which test speed it was measured while giving the S3 hairiness information.

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