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RISS 인기검색어
- 검색키워드
- 저자 : Jakub Wiener (검색결과 5 건)
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Rajesh Mishra,Jakub Wiener,Jiri Militky,Michal Petru,Blanka Tomkova,Jana Novotna 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3
In the present study, flax, jute and glass woven fabric samples were developed as reinforcement for compositeswith bio-epoxy resin. Flax fabrics were developed with plain weave, twill weave (different areal densities) and unidirectional(UD) structure. Jute fabrics were woven with three different structures i.e. plain, matt and twill respectively. For comparisonpurpose, glass woven fabric with plain weave and 3D orthogonal weave were used in this study. Static mechanical propertieslike flexural strength and impact resistance were studied. Dynamic mechanical properties were investigated by DMA 40XTRMI equipment.. Thermal conductivity has been studied for all composite samples. It is observed that the static mechanicalproperties of glass fabrics reinforced composites are superior but the flax & jute fabric reinforced composites are moreflexible. The specific flexural strength as well as specific impact strength of the flax & jute fabric reinforced composites arecompetitive. The dynamic mechanical properties are comparable to that of glass fabric reinforced composites. They can beused in relatively lower load bearing applications as they are a sustainable source of materials for bio-composites whichreduce the environmental burden and reduce the manufacturing cost.
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Development of Maghemite Glass Fibre Nanocomposite for Adsorptive Removal of Methylene Blue
Muhammad Azeem Ashraf,Jakub Wiener,Assad Farooq,Jana Saskova,Muhammad Tayyab Noman 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8
Maghemite glass fibre nanocomposite with excellent magnetic and adsorption properties was successfully developed from nontoxic and eco-friendly reagents by thermal decomposition approach. The developed nanocomposite was utilized in adsorption of methylene blue which follows Freundlich adsorption isotherm. The excellent value of adsorption capacity (51.31 mg g-1) as compared to other adsorbents recommends its potential role for adsorption phenomenon in multiple applications. The developed nanocomposite can be recycled and reused easily. Surface and other functional characteristics of developed nanocomposite were determined through scanning electron microscopy, X-ray diffraction, raman spectroscopy, energy dispersive X-ray spectroscopy and vibrating sample magnetometer. The obtained results revealed that maghemite glass nanocomposite is a potential tool that can be utilized in waste water treatments.
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Asif Javed,Musaddaq Azeem,Jakub Wiener,Monica Thukkaram,Jana Saskova,Tariq Mansoor 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
Zinc oxide (ZnO) nano particles have great importance in textile industry, because of remarkable efficiency andmultiple applications such as antibacterial, UV protection, self-cleaning etc. The aim of this research work was in situ growthof ZnO nano particles on 100 % cotton fabrics with the help of ultrasonic acoustic waves. Zinc nitrate hexahydrate[Zn(NO3)2·6H2O] and sodium hydroxide (NaOH) were used as precursors for ZnO growth. Scanning electron microscopy(SEM), Energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD), Fourier-transform infraredspectroscopy (FTIR) were done to examine the surface morphology and characteristics of deposited nano particles. Furthermore the functional properties i.e. antibacterial, UPF rating, self cleaning, air permeability and bending rigidity of thedeveloped samples were evaluated. The results regarding SEM, EDS, XRD and FTIR confirmed the deposition of ZnO nanoparticleson cotton fabric with pure hexagonal wurtzite crystalline structure. The developed samples showed excellent resultsfor antibacterial, UPF rating and self cleaning with increased bending rigidity and slightly decreased in air permeability.
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Adsorption Kinetics of Acid Red on Activated Carbon Web Prepared from Acrylic Fibrous Waste
M. Salman Naeem,Saima Javed,Vijay Baheti,Jakub Wiener,M. Usman Javed,Syed Zameer Ul Hassan,Adnan Mazari,Jawad Naeem 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1
In this work, activated carbon (AC) web was prepared using physical activation under the layer of charcoal in high temperature furnace. The carbonization of acrylic fibrous waste was performed at different temperatures (800 ℃, 1000 ℃, and 1200 ℃) with heating rate of 300 oC/h and at different holding time. At 1200 ℃, the heating rate of 300 ℃/h and no holding time provided better results of surface area as compared to carbonization at 800 ℃ and 1000 ℃. The activated carbonweb (AC) prepared at 1200 oC was used for removal of Acid Red 27 dye from aqueous media by varying different parameters like initial concentration of dye, stirring speed, adsorbent dosage, and pH. The results were evaluated using non-linear forms of Langmuir and Freundlich isotherms. The Freundlich isotherm was found to describe the results more effectively because of non-homogenous surface of activated carbon web. Further, the kinetics of adsorption was examined using linear and nonlinearforms of pseudo 1st order and pseudo 2nd order.
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Flame Retardancy, Physiological Comfort and Durability of Casein Treated Cotton Fabrics
Sajid Faheem,Vijay Baheti,Nazia Nahid,Maros Tunak,Jakub Wiener,Jiri Militky 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
The present work was aimed to develop the flame retardant textiles for prevention of second-degree burn injuriesfrom low intensity heat flux accidents. The different concentration of casein suspension was applied on cotton fabrics andtheir thermo-oxidative properties, flame retardant behavior as well as physiological comfort were examined. From thermogravimetric analysis, the percentage increase in char residue indicated improvement in thermo-oxidative properties. Themaximum improvement in flame retardant behavior was found in case of 30 w/v % casein suspension due to higherproduction of thermally stable char. Their SEM micrographs also showed the formation of stronger and coherent char withpresence of local intumescence. Furthermore, for estimating small differences in burn length and burn area, the flamepropagation was studied in detail using the image analysis. The lower concentration of casein below 20 w/v % was found toprovide adequate flame retardancy with acceptable physiological comfort and mechanical properties. Finally, the short termdurability of casein treatment was verified under the effect of washing and ageing conditions.
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