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RISS 인기검색어
- 검색키워드
- 저자 : Sonia Zulfiqar (검색결과 5 건)
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Effect of solvent on the CO2 capture ability of polyester: A comparative study
Sonia Zulfiqar,Muhammad Ilyas Sarwar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
A polyester was prepared by condensing 1,3,5-benzenetricarbonyl trichloride with phloroglucinol usingtwo different solvents. Techniques used for characterization include FTIR, XRD, TGA, BET surface area andpore size analysis, FESEM and CO2 adsorption measurements. The highest CO2 uptake of 5.16cm3/g(0.23 mmol/g) at 273 K and 1 bar was achieved by polyester synthesized in DMAc, indicating its superiorperformance than the polyester prepared using 1,4-dioxane due to the more porous nature and bettersurface area. Such types of thermally stable polyesters are expected to be the good candidates for CO2adsorption in harsh environmental conditions.
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Property profile of nanostructured blends of amine functionalized elastomer and epoxy
Sonia Zulfiqar,Irum Fatima,Muhammad Ilyas Sarwar 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
Pure polystyrene-b-poly(ethylene-ran-butylene)-b-polystyrene (SEBS) was functionalized with amine moietyfirst through nitration, followed by reduction. The resulting amine modified SEBS was blended with various amountsof epoxy via in situ reactive approach. Thin blend films were initially cured at 120 oC for 30min and post cured at180 oC for 2 h. These films were then analyzed for their mechanical, thermal and morphological profile. Optimumimprovement in tensile strength, modulus and toughness was observed with different epoxy loading in the blends. These blends were found thermally stable up to 300 oC. The morphological studies indicated ample compatibilitybetween the two components of blends.
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Tehreema Nawaz,Mudassir Iqbal,Sonia Zulfiqar,Muhammad Ilyas Sarwar 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
Silica-coated Fe3O4 nanoparticles were prepared and functionalized with trimellitic anhydride generating novel amide and two acid moieties on the surface of the nanoparticles. These nanoparticles were found to be ferrimagnetic with average particle size 50-60 nm as characterized by XRD, SEM, EDS, VSM and FTIR analyses. The functionalized nanoparticles were exploited as adsorbent for the removal of Pb(II) cations and Cr(VI) anions from their aqueous solutions and uptake of metal ions was monitored by atomic absorption spectroscopy (AAS). These nanoparticles were found to be more effective for the removal of Pb(II) cations due to the negatively charged surface groups relative to Cr(VI) anions. The adsorption data fitted well with Langmuir as well as Freundlich adsorption isotherms, showing a complex nature of adsorption phenomena, comprising electrostatic as well as chemical attraction between surface groups and metal ions. The metal bearing nanoparticles were easily separated from the solution by simply applying external magnetic field
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Influence of Aminosilane Coupling Agent on Aromatic Polyamide/Intercalated Clay Nanocomposites
Alvi, Muhammad Usman,Zulfiqar, Sonia,Yavuz, Cafer T.,Kweon, Hee-Seok,Sarwar, Muhammad Ilyas American Chemical Society 2013 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.52 No.21
<P>Aminosilane grafted and diamine modified reactive montmorillonite was exploited to generate aromatic polyamide based nanocomposites. For better compatibility, the hydrophilic nature of montmorillonite was changed into organophilic using 1,4-phenylenediamine, and the hydroxyl groups present on the clay surface and edges were used to graft 3-aminopropyltriethoxysilane (APTS) on clay sheets. The dispersion of clay was monitored in the polyamide obtained from 1,4-phenylenediamine, 4,4′-oxydianiline, and isophthaloyl chloride. These chains were converted into carbonyl chloride ends to interact with free amine groups of grafted APTS and diamine. Thin films were probed for FTIR, XRD, SEM, TEM, tensile testing, TGA, and DSC measurements. The results described ample dispersion of clay in the nanocomposites with tensile strength increased 110% and elongation increased 172% upon the addition of 4–6 wt % clay. Thermal decomposition temperatures of the nanocomposites were in the range 425–480 °C. The glass transition temperature increased up to 142.4 °C with 6 wt % addition of organoclay.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2013/iecred.2013.52.issue-21/ie400463z/production/images/medium/ie-2013-00463z_0013.gif'></P>
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Limitations and high pressure behavior of MOF-5 for CO<sub>2</sub> capture
Jung, Joo Young,Karadas, Ferdi,Zulfiqar, Sonia,Deniz, Erhan,Aparicio, Santiago,Atilhan, Mert,Yavuz, Cafer T.,Han, Seung Min The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.34
<P>Porous network structures (<I>e.g.</I> metal–organic frameworks, MOFs) show considerable potential in dethroning monoethanol amine (MEA) from being the dominant scrubber for CO<SUB>2</SUB> at the fossil-fuel-burning power generators. In contrast to their promise, structural stability and high-pressure behavior of MOFs are not well documented. We herein report moisture stability, mechanical properties and high-pressure compression on a model MOF structure, MOF-5. Our results show that MOF-5 can endure all tested pressures (0–225 bar) without losing its structural integrity, however, its moist air stability points at a 3.5 hour safety window (at 21.6 °C and 49% humidity) for an efficient CO<SUB>2</SUB> capture. Isosteric heats of CO<SUB>2</SUB> adsorption at high pressures show moderate interaction energy between CO<SUB>2</SUB> molecules and the MOF-5 sorbent, which combined with the large sorption ability of MOF-5 in the studied pressure–temperature ranges show the viability of this sorbent for CO<SUB>2</SUB> capturing purposes. The combination of the physicochemical methods we used suggests a generalized analytical standard for measuring viability in CO<SUB>2</SUB> capture operations.</P> <P>Graphic Abstract</P><P>A three-way systematic physicochemical evaluation unravels feasibility of porous materials for CO<SUB>2</SUB> scrubbing. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp51768c'> </P>
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