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RISS 인기검색어
- 검색키워드
- 저자 : Hassanajili Shadi (검색결과 5 건)
- 무료
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Mohammad Khashi,Shadi Hassanajili,Seyyed Iman Golestaneh 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7
Electrospun composite fibers of poly-lactic acid (PLA), chitosan (Ch) and paclitaxel (PTX) were fabricated for surface covering of a polymeric prototype PLA stent by means of single nozzle electrospinning approach to prepare a low cytotoxicity drug-eluting stent. Different concentrations of the drug (40 %, 60 %, 80 %, 100 % and 120 %) and chitosan (3 %, 5 %, 7 % and 9 %) were incorporated to reach the optimum composite fibers. The electrospun composite fibers were subjected to detailed analyses including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), tensile test, MTT assay, cell culture and in vitro drug release. Results have confirmed a proper physical encapsulation of PTX in the polymeric matrix in which no chemical bonding was detected between the polymers and the drug. Among the fabricated composite fibers, specimens including 40 % and 60 % drug also exhibited an excellent cytotoxicity and controlled drug release. SEM images have proved the effect of paclitaxel in resisting cell adhesion and propagation on the fibers. Findings from this study suggest a novel polymer/drug coating that could be potentially applicable in surface covering of polymeric stents e.g. PLA stents.
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Setareh Pishva,Shadi Hassanajili 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
Dual-layer composite membranes composed of Pebax 1657, different 1-Ethyl-3-methylimidazoliumtetrafluoroborate ([Emim][BF4]) contents and Polyethersulfone (PES) were fabricated by co-castingmethod, to investigate CO2/light gases separation, due to the high affinity of CO2 to Pebax and the ionicliquid (IL). Gas permeation test, which was performed at 25 C and pressure range of 4–8 bar, indicatedremarkable increment in CO2, CH4 and N2 permeance through membranes, especially CO2, as well as idealCO2/CH4 and CO2/N2 selectivities, with IL increment. At 6 bar, CO2 permeance increased 152.97% meanwhile,at 8 bar, CO2/CH4 and CO2/N2 selectivities increased 59.22% and 28.64%, respectively, in the membranecontaining 20 wt. % IL, which is the optimum IL content. In addition, CO2 permeance and selectivityincreased with pressure. FTIR, XRD, DSC, SEM, dynamic frequency sweep, contact angle and tensile testresults revealed the formation of defect-free dense Pebax/IL top-layer on porous PES sub-layer. IL additionled to formation of new bonds between the IL and Pebax which cause changes in the chain packingand crystallinity of Pebax and fabrication of more amorphous top-layer and more porous sub-layer. Theseresults are confirmed by decrement in the mechanical properties of Pebax/IL casting solutions and compositemembranes, by IL increment.
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Hooman Adib,Shadi Hassanajili,Mohammad Reza Sheikhi-Kouhsar,Abdolhamid Salahi,Toraj Mohammadi 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
An experimental study on separation of industrial oil from oily wastewater has been done. A polyacryloni-trile membrane with a molecular weight cut-off (MWCO) of 20 kDa was used and an outlet wastewater of API unit ofTehran refinery was employed. The main purpose of this study was to develop a support vector machine model forpermeation flux decline and fouling resistance in a cross-flow hydrophilic polyacrylonitrile membrane during ultrafil-tration. The operating conditions which have been applied to develop a support vector machine model were trans-membrane pressure (TMP), operating temperature, cross flow velocity (CFV), pH values of oily wastewater, perme-ation flux decline and fouling resistance. The testing results obtained by the support vector machine models are in verygood agreement with experimental data. The calculated squared correlation coefficients for permeation flux declineand fouling resistance were both 0.99. Based on the results, the support vector machine proved to be a reliable accurateestimation method.
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Yasamin Khosravi,Shadi Hassanajili,Mohammad Hosein Moslemin,Masumeh Tabatabaei 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
Composite membranes of sulfonated poly(ethersulfone)/1,1-carbonyl diimidazole/1-(3-aminopropyl)- silane/silica (SPES/CDI/AS/SiO2) with silica of various contents (3, 5 and 8 wt%) were prepared as electrolytes for direct methanol fuel cells (DMFCs). Comparison was made with pure SPES and SPES/SiO2. The properties of the composite membranes were studied by FTIR, TGA, XRD, water and methanol uptake, proton conductivity. SPES/CDI/AS/SiO2 membranes were also characterized by scanning electron microscopy (SEM), which showed good adhesion between the modified sulfonic acid (-SO3H) groups of SPES and silica because of cross-linking with covalent bond formation and reduced cavities in the composites. This effect played an important role in reducing water uptake, methanol uptake and methanol permeability of the SPES/CDI/AS/SiO2 composites. The water and methanol uptake and also methanol permeability of the SPES/CDI/AS/SiO2 composite membrane with 8% SiO2 were found in the order 3.58%, 2.48% and 1.91×10−7 (cm2s−1), lower than those of SPES and Nafion 117. In SPES membrane of 16.94% level of sulfonation, the proton conductivity was 0.0135 s/cm at 25 oC, which approached that of Nafion 117 under the same conditions. Also, the proton conductivity of the SPES/CDI/AS/SiO2 8% membrane was 0.0186 s/cm, which was higher than that of SPES at room temperature. The preparation of SPES/SiO2 composites in the presence of AS and CDI, led to 63%, 56% and 64% reduction of water uptake, methanol uptake and methanol permeability, respectively without a sharp drop in proton conductivity of the composite membranes which featured a good balance between high proton conductivity, water and methanol uptake of SPES/CDI/AS/SiO2 membranes.
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Sadeghi Rahman,Hassanajili Shadi 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.4
Mixed matrix membranes (MMMs) are brought up as prospecting media to sweeten natural gas in recent decades. But the majority of experiments have conducted on CO 2 /CH 4 gas pair separation, and H 2 S removal from CH 4 through MMMs has been paid less consideration. Thereupon, polycarbonate (PC) permeability and permselectivity as a polymer with inherent gas transport properties and two PC-based MMMs containing octylsilane (OS) and polydimethylsiloxane (PDMS)-modifi ed nanosilica were investigated under various operational conditions for this gas couple. The infl uence of operational parameters including transmembrane pressure, feed temperature, H 2 S inlet concentration and physical aging on the permeability of mixed gas and selectivity of the H 2 S/CH 4 pair was assessed. It was observed that addition of silica nanoparticles causes more H 2 S permeability and selectivity. As a result, it can be used for methane upgradation. Membranes fabricated with PDMS-modifi ed nanosilica showed the highest permeability of H 2 S and also the superior selectivity of H 2 S/CH 4 . Therefore, it could be possibly applied to mitigation of H 2 S concentration in the outlet gas stream.
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