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RISS 인기검색어
- 검색키워드
- 저자 : Nabawia A. El‑Zaher (검색결과 2 건)
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Abeer A. Abd El Aty,Gehan T. El-Bassyouni,Nabawia A. Abdel-Zaher,Osiris W. Guirguis 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9
In the present study, a novel eco-friendly production of silk fabrics dyed with different natural dye bath concentrations (40, 80, 120, 160, 200 and 240 g/l) extracted from neem (Azadirachta indica) leaves was developed. The surface morphology of the fabrics was examined by scanning electron microscopy (SEM) and Fourier-transform infrared (FTIR) spectroscopy to characterize the chemical structure of the fabrics. The SEM images of the undyed fabric show that the fabric was tightly woven with little porosity between the fibres with dozens of silk threads in orthogonal directions. By increasing the neem concentration, a scale of fine particles grew on the surface of the silk fabrics with little macroscopical defects was demonstrated. The fiber diameters and tightness between filaments were significantly increased. The FTIR displayed that, neem dye does not change the characteristic peaks of the silk fabrics. Also, the evaluation of the antimicrobial activity of the undyed and neem dyed silk fabrics was monitored for Gram positive and Gram negative bacteria in addition to yeasts and fungi by using the agar diffusion method. The comparison between the different dye bath concentrations was based on the inhibition zones obtained after incubation. The antimicrobial activity in leaf extract of neem was estimated in Staphylococcus aureus, Bacillus subtilis and Lactobacillus cereus (Gram positive bacteria); Escherichia coli (Gram negative bacteria); Candida albicans and Candida tropicalis (yeasts); and Aspergillus niger and Fusarium solani (fungi). The results emphasized that, the highest neem dye bath concentration (240 g/l) was found to display good inhibitory effect against the Gram positive and reasonable activity against the Gram negative bacteria. Furthermore, the different dye bath concentrations possess no activities against yeast and fungi. In conclusion, the data reveal that the increase of neem dye concentration does not damage the silk fabric; however, it improves its antimicrobial activity by incorporating with antimicrobial agent. The current study highlighted that using neem leaves had beneficial effect in controlling the pathogenic microbial organisms.
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Najlaa D. Alharbi,Hanan H. Amer,Nabawia A. El‑Zaher,Osiris W. Guirguis 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
In this paper, treated Saudi cotton fabrics were prepared by dipping them in chitosan and chitosan/ZnO-NPs solutions offour different concentrations (10, 20, 30, and 40 wt% ZnO-NPs). The chemical compositions, optical properties, mechanicalcharacteristics, and air permeability of the prepared fabrics after immersion were investigated. The tristimulus valuesof the CIE, color parameters, extinction coefficient, and color strength were evaluated using reflectance spectra recorded inthe visible region. Untreated fabric and treated cotton fabrics (CF/Ch/ZnO-NPs) were assessed with regard to washability,acidic perspiration, and alkaline perspiration. Differences in the ratio of distinct bands can be seen in the FTIR spectroscopydata, indicating that the intensity of the O–H band is decreasing. Differences in the ratio of the distinct bands can be seen inthe FTIR spectroscopy data, indicating that the O–H band’s intensity is decreasing. The photon energy dependence of theabsorption coefficient revealed that optical transmission is allowed and direct. The ultraviolet protection factor (UPF) wasdetermined using color strength analysis, and the results showed that the treated cotton fabrics provide good-to-very goodUV protection. The fabrics were also very durable when it came to multiple washes. The mechanical characteristics and airpermeability data show a relationship between the presence of chitosan and the quantities of ZnO-NPs, as well as interactionsbetween them and the fabric network. This is the first study to try and improve the characteristics of Saudi cotton fabrics, sothat they can be used in a variety of industrial and medicinal applications.
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