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RISS 인기검색어
- 검색키워드
- 저자 : Al-Enizi Abdullah M. (검색결과 3 건)
- 무료
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Single-nozzle Core-shell Electrospun Nanofibers of PVP/Dextran as Drug Delivery System
Meera Moydeen A.,Syed Ali Padusha M.,Badr M. Thamer,Anis Ahamed N.,Abdullah M. Al-Enizi,Hany El-Hamshary,Mohamed H. El-Newehy 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
Ciprofloxacin-loaded poly(vinylpyrrolidinone) (PVP) and dextran sulfate (Dex) (PVP/Dex) nanofibers wereprepared using the emulsion electrospinning method. The physical and morphological characteristics of the preparednanofibers were evaluated by conducting a Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy(SEM) and thermogravimetric analysis (TGA). The polymer-polymer and polymer-drug interactions were determined usingdifferential scanning calorimetry (DSC). Moreover, the formation of the core-shell structure was confirmed by transmissionelectron microscopy (TEM) and confocal laser microscopy. The sustained release behavior was evaluated using ultravioletvisible(UV-vis) spectroscopy, and its kinetic mechanism was investigated using Korsmeyer-Peppas, Peppas-Sahlin, andWeibull models by a non-linear regression equation. The antibacterial properties were evaluated using the disc diffusionmethod with respect to several wound gram-positive (Methicillin-resistant Staphylococcus aureus (MRSA), Staphylococcusepidermidis, Staphylococcus aureus, and Klebsiella pneumoniae) and gram-negative bacteria (Pseudomonas aeruginosa,Salmonella typhimurium, and Proteus vulgaris). In general, the release behavior of Ciprofloxacin from PVP/Dex is controlledby diffusion in the delivery system.
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Mohamed Rehan,Mehrez E. El-Naggar,Abdullah M. Al-Enizi,Asma A. Alothman,Ayman Nafady,Reda M. Abdelhameed 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
In this study, to impart silkfibers with excellent coloration, UV-protection, antimicrobial activity, as wellas creatinine adsorption from artificial blood, silkfibers were designed via facile fabrication approach. These diverse properties were introduced by in-situ incorporation of nanoparticles based on either silver(AgNPs) or gold (AuNPs) as well as bimetallic (Ag-AuNPs) onto silkfibers using an eco-friendly, effectiveone-pot process. The proteins present in the silkfibers acted as a redox-active bio-template to reduce theAg(I) and Au(III) ions to their zero-valent state with simultaneous deposition of the generatednanoparticles onto the silkfiber surfaces. The obtained results clearly indicated that both AgNPs andAuNPs colored the silkfibers with brown and red color, respectively, thereby affirming the deposition ofthese metallic NPs onto and inside the surface of silkfibers as S/Ag-AuNPs. Significantly, the preparedcolored silkfibers exhibited excellent antimicrobial and cytotoxicity activities against differentpathogenic microbes as well as very good UV protection properties. Moreover, the results attestedthat the as prepared S/AgNPs and S/AuNPsfibers have good adsorption potential with maximaladsorption capacity of creatinine in artificial blood was found to be 94.2 mg/g for S/AuNPs sample, whichis 1.55 times greater than that of silkfibers.
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Promoting N2 electroreduction to ammonia by fluorine-terminating Ti3C2Tx MXene
Ding Yu,Zhang Junbo,Guan Anxiang,Wang Qihao,Li Si,Al-Enizi Abdullah M.,Qian Linping,Zhang Lijuan,Zheng Gengfeng 나노기술연구협의회 2021 Nano Convergence Vol.8 No.14
Two-dimensional MXene-based materials are potential of presenting unique catalytic performances of electrocatalytic reactions. The surface functionalization of MXene-based catalysts is attractive for developing efficient electrocatalysts toward nitrogen reduction reaction. Herein, we reported a Ti 3 C 2 T x MXene with a medium density of surface functionalized fluorine terminal groups, as an excellent N 2 reduction reaction electrocatalyst with enhanced adsorption and activation of N 2 . The Ti 3 C 2 T x MXene catalyst showed a production rate of ammonia as 2.81 × 10 –5 μmol·s −1 ·cm −2 , corresponding to a partial current density of 18.3 μA·cm −2 and a Faradic efficiency of 7.4% at − 0.7 V versus reversible hydrogen electrode in aqueous solutions at ambient conditions, substantially exceeding similar Ti 3 C 2 T x MXene catalysts but with higher or lower densities of surface fluorine terminal groups. Our work suggests the capability of developing surface functionalization toolkit for enhancing electrochemical catalytic activities of two-dimensional MXene-based materials.
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