Researcher:
Yılmaz, Gamze

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Master Student

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Gamze

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Yılmaz

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Yılmaz, Gamze

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2012 - 20154

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Researcher Of Publications: search.filters.isAuthorOfPublication.b6a4138a-fb68-4923-9436-4dd2a30f7cdf

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Now showing 1 - 4 of 4
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    Recent advances in metal-organic framework-based mixed matrix membranes
    (Wiley-V C H Verlag Gmbh, 2013) N/A; N/A; N/A; Department of Chemical and Biological Engineering; Eruçar, İlknur; Yılmaz, Gamze; Keskin, Seda; PhD Student; Master Student; Faculty Member; Department of Chemical and Biological Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; 260094; N/A; 40548
    Mixed matrix membranes (MMMs) combine easy processability and low cost of polymers with the high selectivity of nanoporous filler particles. These membranes represent an important avenue for enhancing the performance of polymeric membranes in gas separations. Recently, a new group of nanoporous materials called metal-organic frameworks (MOFs) have been used as filler particles in MMM applications, and significant improvements in gas selectivity and permeability have been reported for these MOF-based membranes. We discuss the recent developments in MOF-based MMMs by reviewing both the experimental studies and computational modeling methods that can accelerate selection of MOF/polymer combinations for high-performance gas separations.
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    Molecular modeling of MOF and ZIF-filled MMMs for co2/n-2 separations
    (Elsevier, 2014) N/A; Department of Chemical and Biological Engineering; Yılmaz, Gamze; Keskin, Seda; Master Student; Faculty Member; Department of Chemical and Biological Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 40548
    In this study, gas permeability and selectivity of metal organic framework and zeolite imidazolate framework-filled mixed matrix membranes (MOE; and ZIE-filled MMMs) were predicted using atomically detailed simulations and continuum modeling methods for CO2/N-2 separations. The accuracy of the computational methods was validated by comparing the gas permeability and selectivity of several MOF and ZIF-filled MMMs with the available experimental data. After the good agreement between experiments and computational predictions was shown, this approach was used to estimate the separation performances of several new MMMs composed of various polymers and ZIFs. Effects of framework flexibility of the filler particles, filler loading and operation temperature on the CO2/N-2 separation performance of MMMs were examined. CO2/N-2 separation performances of MMMs composed of two different types of fillers and MMMs composed of two different types of polymers were also studied. Results showed that there are several promising MOF and ZIF-filled MMNls that can achieve CO2/ N-2 separation with high CO2 selectivity.
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    Computational screening of ZIFs for CO2 separations
    (Taylor & Francis Ltd, 2015) N/A; N/A; Department of Chemical and Biological Engineering; Yılmaz, Gamze; Özcan, Aydın; Keskin, Seda; Master Student; PhD Student; Faculty Member; Department of Chemical and Biological Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 40548
    Using molecular simulations, we studied a diverse collection of zeolite-imidazolate frameworks (ZIFs) to evaluate their performances in adsorption- and membrane-based gas separations. Molecular simulations were performed for both single-component gases (CH4, CO2, H-2 and N-2) and binary gas mixtures (CO2/CH4, CO2/N-2, CO2/H-2 and CH4/H-2) to predict the intrinsic and mixture selectivities of ZIFs. These two selectivities were compared to discuss the importance of multi-component mixture effects on making predictions about the separation performance of a material. Gas separation performances of ZIFs were compared with other nanoporous materials and our results showed that several ZIFs can outperform well-known zeolites and metal-organic frameworks in CO2 separations. Several other properties of ZIFs such as gas permeability, working capacity and sorbent selection parameter were computed to identify the most promising materials in adsorption- and membrane-based separation of CO2/CH4, CO2/N-2, CO2/H-2 and CH4/H-2.
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    Predicting the performance of zeolite imidazolate framework/polymer mixed matrix membranes for CO2, CH4, and H-2 separations using molecular simulations
    (Amer Chemical Soc, 2012) Department of Chemical and Biological Engineering; Yılmaz, Gamze; Keskin, Seda; Master Student; Faculty Member; Department of Chemical and Biological Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 40548
    We used molecular simulations to assess the performance of zeolite imidazolate framework (ZIF) based mixed matrix membranes (MMMs) for CO2/CH4, H-2/CH4, and H-2/CO2 separations. The gas permeability of ZIF based MMMs was estimated based on the gas permeability of pure ZIFs obtained from molecular simulations and the gas permeability of pure polymers obtained from experimental studies. Predicted gas selectivity and permeability were compared with the available experimental data of MMMs in which ZIF-8 and ZIF-90 were used as filler particles. After showing the good agreement between the predictions of theoretical methods and experiments, we estimated gas selectivity and permeability of 360 new MMMs composed of 15 different ZIFs and 24 different polymers. Our results showed that ZIF-11 based MMMs exhibit high performance for separation of CO2/CH4 whereas ZIF-65 based MMMs are good candidates for H-2/CO2 separation.