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RISS 인기검색어
- 검색키워드
- 저자 : Nimra Fatima (검색결과 3 건)
- 무료
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Appraisal of geopolymer lightweight aggregates sintered by microwave radiations
Nimra Saleem,Khuram Rashid,Noor Fatima,Sadia Hanif,Ghinwa Naeem,Aamna Aslam,Miral Fatima,Kiran Aslam 아시아콘크리트학회 2020 Journal of Asian Concrete Federation Vol.6 No.2
This work was designed for the production of geopolymer based lightweight aggregate (LWA) using industrial by-products. Combination of fly ash (FA) and silica fume (SF) were used as precursors, whereas, combination of sodium hydroxide and sodium silicate were used as activator. Small amount of sodium bicarbonate was also used for surface hardening and early strength development. Pellets of dif-ferent sizes were crafted manually and cured by microwave radiations just for 5 minutes. The physico-mechanical properties of produced pellets (LWA) were discussed in light of: morphology, density, water absorption, specific gravity, porosity, aggregate impact value, and particle crushing strength. The prop-erties of LWA were also compared with literature reported synthetic LWAs cured with different tech-niques. The water absorption and specific gravity of LWAs were within the specified range provided by ACI standard. Mechanical strength properties briefed that the produced LWAs were strong enough to resist compressive load comparable to natural LWAs and many other synthetic LWAs. Thus, proposed curing method, microwave irradiation, has been found to be a sustainable and fast curing technique than conventional energy-intensive curing regimes. The results also confirmed that produced LWAs have po-tential to replace natural LWAs both in cast-in-place and precast concrete elements with possible eco-nomic, environmental, and technical benefits.
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Recent developments for antimicrobial applications of graphene-based polymeric composites: A review
Nabira Fatima,Umair Yaqub Qazi,Asim Mansha,Ijaz Ahmad Bhatti,Rahat Javaid,Qamar Abbas,Nimra Nadeem,Zulfiqar Ahmad Rehan,Saima Noreen,Muhammad Zahid 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
Owing to its captivating properties, Graphene-based materials (GMBs) have appeared as a broad-spectrumantimicrobial material and attracting scientists and researchers’ attention. By focusing on the recentadvances in the polymeric nanocomposite’sfield, current study is positioned on the graphene-basedpolymeric composites having antibiofilm and antimicrobial activities to confront the current situations ofmicrobial resistance against antibiotics and other drugs. Furthermore, this review summarizesthe influenceof different factors on the antimicrobial activities of graphene-based polymeric composites like size, shape,number of layers, concentration, dispersibility, and functionalization, and also shed the light on the possiblemode of actions of these materials. Graphene-based polymeric composites exert its antimicrobial action byphysical damages (e.g., direct sharp edges’ contact to cell membranes of bacteria, wrapping of the bacterialcell, phospholipid extraction, and photo-thermal ablation) and chemical damages (e.g. oxidative-stress andcharge transfer). Besides, this review article thoroughly describes the antimicrobial applications ofgraphene-based polymeric composites, which are because of their good biocompatibility and superiorantimicrobial properties such as wound bandages and dressings, antimicrobial coatings, drug delivery, foodpackaging, hydrogel formation, and water disinfection. Present review may stimulate major concerns, spurfurther developments, and provide valuable insight into the promisingfields.
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Induced Magnetic Properties of BN Nanotubes by the Adsorption of First-row Adatoms
Fayyaz Hussain,Muhammad Imran,Nimra Fatima,Anwar Manzoor Rana,R. M. Arif Khalil,Arshad Javid,Muhammad Ismail 한국자기학회 2018 Journal of Magnetics Vol.23 No.1
This work is performed to study the effect of adsorption of various first row adatoms (such as Be, C, F, Li and O) on (8, 0) zigzag boron nitride nanotubes (BNNTs) on their structural, electronic and magnetic properties. These calculations are based on density functional theory using pseudopotentials technique. For this purpose, five different sites namely axial, hexagonal, zigzag, on top of N and/or B (which are the most preferred available sites for adatoms on (8, 0) BNNTs) were utilized. The energetically stable sites for each of the first-row adatoms are found to be different because of their different electronic configurations caused by the charge transfer/ rearrangements between s-p or p-p orbitals. The binding energies of all adatoms on (8, 0) BNNTs have been calculated through structural optimization process after adsorbing these five adatoms at the above said sites on the BNNTs and are found to be in the energy range from -2.04 to 2.96 eV. It is further elaborated that F, Be and C adatoms on (8, 0) BNNTs show strong induced magnetization at specific localized sites depending upon the nature of adatom, whereas weak magnetization is noticed for Li and O adatoms on the BNNTs. Such localized induced magnetization could be associated with the hybridization of s-p or p-p orbitals of adatoms and B and/or N atoms.
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