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RISS 인기검색어
- 검색키워드
- 저자 : Komeil Nasouri (검색결과 4 건)
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Alireza Gholamhosseini,Komeil Nasouri,Ahmad Mousavi Shoushtari,Farimah Mirgoli 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
In this study, novel polyamide 6 (PA6)/zinc oxide (ZnO) hybrid nanofibers membranes containing of elongated-ZnO and spherical-ZnO nanoparticles were successfully fabricated using electrospinning/electrospraying method. Elongated-ZnO a higher surface area than spherical-ZnO nanoparticles do because of its unique structure, thus yielding higherperformance. The novel PA6/ZnO hybrid nanofibers are smooth, bead-free, and very fine diameter (130-145 nm) whichshows perfect conditions for electrospinning/electrospraying technique. The electrospun PA6/elongated-ZnO hybridnanofibers decomposed >60 % of the methylene blue in the only short time of UV irradiation. The various morphologies ofZnO nanoparticles displayed differences in photocatalytic performance and ultra violet protection factor (UPF), and wereranked as follows: elongated-ZnO > spherical-ZnO. In addition, the increase in content of ZnO nanoparticles in nanofibersleads to higher collision among them; therefore, better UV protection properties were achieved. The novel PA6/ZnO hybridnanofibers containing of elongated-ZnO nanoparticles with UPF=48 were fabricated. In this study established that PA6/ZnOhybrid nanofibers, specifically those with the elongated-ZnO nanoparticle, can be useful in UV protecting materials.
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Mohammad Amini,Komeil Nasouri,Gholamreza Askari,Mohsen Shanbeh,Akbar Khoddami 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
This paper describes a study on the development of novel lightweight and highly flexible composites forelectromagnetic interference (EMI) shielding applications. The weft-knitted fabrics produced by using polyester/cotton,polyester/cotton-copper, and polyester/cotton-stainless steel composite yarns with metal deposition and without metaldeposition were tested to determine the EMI shielding effectiveness (SE). The surface structures of all composite fabricsamples were observed by stereomicroscope. The state of the presence of metal particles on the metal deposited compositefabric was studied by field emission scanning electron microscope (FESEM) and energy dispersive X-ray (EDX) analyzer. The EDX analyses confirmed the presence of metal particles, and the FESEM analyses revealed uniformly deposited metalparticles on the surface of composite fabrics. The EMI shielding was also evaluated using vector network analyzers in thefrequency range of 8-12 GHz for all samples. The highest value of EMI SE in this research for the composite fabric with themetal deposited sample was achieved to 19.53-23.95 dB. Moreover, the breathability and the durability of produced fabricswere characterized by air permeability, moisture regains, abrasion resistance, and washing fastness. The results of EMIshielding, durability, and breathability tests confirmed their potential for use as an excellent material for EMI shielding inwearable textiles for commercial applications.
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Production of novel activated carbon fibers from smoked cigarette wastes using NaOH
Zahra Ranjkesh,Komeil Nasouri 한국고분자학회 2023 Macromolecular Research Vol.31 No.7
This research reports the activated carbon fibers (ACFs) production from smoked cigarette wastes by a simple and facile technique. One-step carbonization/activation process with a NaOH activating agent has been considered for the first time. Cigarette waste-derived ACFs samples were synthesized using various NaOH concentrations and heating rates. The carbon yield, morphology, chemical composition, and surface area of the ACFs were analyzed and compared. Pre-treatment with NaOH activation agent improves the carbon yield, thermal stability, and surface area. The optimal microporous ACFs with 34.82 wt% of carbon yield and 1357 m2/g of surface area were synthesized by 10 g/L of NaOH pre-treatment and 2 ℃/min of heating rate. The ACFs samples synthesized with higher NaOH concentrations are mainly the mesoporous structure and lower surface area. This study presented a manageable approach for synthesizing high-performance ACFs with unique fibrous structures from smoked cigarette wastes. Main advantage of the designed procedure is establishing an environmentally friendly manufacturing of micro/ mesoporous ACFs.
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Golestan Salimbeygi,Ahmad Mousavi Shoushtari,Komeil Nasouri,Reza Malek,Firoozmehr Mazaheri 한국고분자학회 2015 Macromolecular Research Vol.23 No.8
Electrospinning of conductive polymer blends offers high potential to prepare novel materials for electronical applications. The main aim of this work is to fabricate poly(vinyl alcohol) (PVA), polyaniline (PANI), and multi walled carbon nanotubes (MWNT) composites in thin film and nanofiber layer structures and then compare their microwave absorption behavior. First, optimum ratios for blending PVA, PANI, Camphorsulfonic acid (CSA) and MWNT were obtained. Then under optimized ratios, composite solutions of PVA: PANI-CSA, and PVA/PANI-CSA/ MWNT were fabricated to nanofiber layer and thin film structures. Based on scanning electron microscope (SEM) micrographs, the PVA/PANI-CSA nanofiber samples at low content of PANI-CSA presented a very uniform surface and without any beads but some beads started to develop at higher PANI-CSA content. However, the SEM analysis of the PVA/PANI-CSA/MWNT films revealed the uniform appearance for all composites. But, some aggregation and local irregularities on the surface were observed due to the presence of MWNT in the composite structure. Microwave absorption behavior was evaluated using vector network analyzers in the frequency range of 8-12 GHz (X-band) for all samples. It was observed that absorption microwave properties of PVA/PANI-CSA nanofibers improved with increasing in the loading levels of PANI-CSA in the mixture. Microwave absorption properties of the PVA/PANI-CSA/MWNT composite nanofiber absorbers have been compared with thin films at various thicknesses by measuring the relative maximum reflection loss (dB/mm) of samples. The PVA/PANI-CSA/MWNT composite nanofibers with the layer thickness of 0.1 mm presented two remarkable absorbing peaks versus one absorbing peak in nanocomposite films with similar thickness. The relative maximum reflection loss in PVA/PANI-CSA/MWNT composite nanofiber has reached -230 dB/mm at frequency of 8.6 GHz which is nearly 8 times higher than -28 dB/ mm at frequency of 8.4 GHz for PVA/PANI-CSA/MWNT film samples.
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