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RISS 인기검색어
- 검색키워드
- 저자 : Sheila Shahidi (검색결과 3 건)
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- 기관 내 무료
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Sheila Shahidi,Bahareh Moazzenchi 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8
Ultraviolet (UV) radiation is harmful for humans. Some textiles can protect humans against UV radiation. Ordinary fabrics have low ultraviolet protection values and can be modified by some finishing treatments. In this researchwork, madder and weld as natural dyes were used to dye wool fabric in order to increase UV protection. Two methods wereused to modify natural dyeing of the wool fabric. In the first one, CuSO4 and FeSO4 were used as mordant for natural dyeing. In the second method, which is novel, plasma sputtering of wool fabrics by Cu and Fe in order to improve the UPF value andthe affinity of wool fabric towards natural dyes were used and results were compared. The results show that, both natural dyeand mordant treatment are effective in improving the UV protection properties of wool fabrics. On the other hand, plasmasputtering as an eco-friendly and dry method play very important role for improving the UPF value of the fabrics.
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Dry Finishing Using Plasma Treatment for Shortening the Initial Wet Finishing of Cotton Fabrics
Nezam Samei,Sheila Shahidi,Rattanaphol Mongkholrattanasit 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
Simultaneity of different processes in finishing of textile products is very useful. It causes reducing energyconsumption and increasing the speed of production. Moreover, by this way it is possible to reduce water consumption andenvironmental pollution. In this research, synchronizing the processes of desizing, scouring and bleaching at ambienttemperature for raw cotton fabrics have been investigated using plasma technology. In this work plasma textile activator,under air atmospheric pressure was used. Untreated and plasma treated cotton fabric were desized, scoured and bleachedusing a solution containing alkaline peroxide and ammonium persulfate as an oxidation accelerator by padding method atroom temperature (Cold Pad Batch). In order to evaluate the results of this treatment, the amount of impurities, degree ofwhiteness and wettability of untreated and plasma treated fabrics were investigated and compared with each other. The resultsshow that the starch partially remains on untreated fabric, while by plasma treatment the starch is completely removed. Plasma treated fabrics have a higher degree of wetting and a higher whiteness than those of untreated. Results of this studyindicate that the plasma treatment of cotton reduces the time it takes to remove starch from cotton products. SEM images ofuntreated and plasma treated fabrics, as well as FTIR spectra of the fabrics; indicate the degradation of starch by the plasmaprocess and the increase of polar groups in cotton fibers. Also, by performing a dry plasma treatment on raw cotton, whileallowing the desizing, scouring and bleaching steps to be simultaneously, economized in water and energy at a single stageand at ambient temperature.
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Samane Parsian,Mohammad Mirjalili,Sheila Shahidi,Mahmood Ghoranneviss 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4
The main aim of this research work is in situ synthesis of carbon nano tube (CNT) on nonwoven glass mat. Different types of catalyst were used and the effect of them on growth of carbon nanotubes on glass mat was investigated. The process was considered as variable catalysts to achieve optimal conditions for CNT deposition on glass mat. In this research, iron, cobalt, copper and nickel were used as catalysts and acetylene gas was used as the hydrocarbon source. Also, argon was used as a carrier gas. In first step, samples were coated by mentioned catalyst using plasma sputtering method. The thickness of the catalyst on the surface of samples was fixed at 100 nm. In second part, thermal chemical vapor deposition (TCVD) system was used for growth of carbon nano tubes. Scanning electron microscopy (SEM) and raman spectroscopy, thermogravimetric analysis (TGA-DTG) and transmission electron microscopy (TEM) were used for investigating the morphology and quality of produced CNT. Electrical conductivity was observed and compared on both untreated and coated glass mat. The results show that, by pre sputtering of samples with nickel, the quality of CNT on the surface of glass mat will be improved and the resistivity of samples reach to 610 Ω.
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