Zeolite membranes for gas separations: synthesis and transport properties

Ural, Ahmet Turhan


Polycarbonate based zeolite 4a filled mixed matrix membranes: preparation, characterization and gas separation performances
Şen, Değer; Yılmaz, Levent; Department of Chemical Engineering (2008)
Developing new membrane morphologies and modifying the existing membrane materials are required to obtain membranes with improved gas separation performances. The incorporation of zeolites and low molecular-weight additives (LMWA) into polymers are investigated as alternatives to modify the permselective properties of polymer membranes. In this study, these two alternatives were applied together to improve the separation performance of a polymeric membrane. The polycarbonate (PC) chain characteristics was a...
Development and characterization of composite proton exchange membranes for fuel cell applications
Akay, Ramiz Gültekin; Baç, Nurcan; Department of Chemical Engineering (2008)
Intensive research on development of alternative low cost, high temperature membranes for proton exchange membrane (PEM) fuel cells is going on because of the well-known limitations of industry standard perfluoro-sulfonic acid (PFSA) membranes. To overcome these limitations such as the decrease in performance at high temperatures (>80 0C) and high cost, non-fluorinated aromatic hydrocarbon based polymers are attractive. The objective of this study is to develop alternative membranes that possess comparable ...
Tamoxifen-model membrane interactions: An FT-IR study
Boyar, H; Severcan, Feride (1997-06-01)
The temperature- and concentration-induced effects of tamoxifen (TAM) on dipalmitoyl phosphatidylcholine (DPPC) model membranes were investigated by the Fourier transform-infrared (FT IR) spectroscopic technique. An investigation of the C-H stretching region and the C=0 mode reveals that the inclusion of TAM changes the physical properties of the DPPC multibilayers by (i) shifting the main phase transition to lower temperatures; (ii) broadening the transition profile slightly; (iii) disordering the system i...
Tamoxifen Increases Membrane Fluidity at High Concentrations
Severcan, Feride; Kazanci, Nadide; Zorlu, Faruk (Portland Press Ltd., 2000-6-1)
There are contradictory results in the literature relating to the effect of tamoxifen on membrane fluidity. The present work investigates the effect of tamoxifen on membrane dynamics to find out whether the concentration of tamoxifen can be one of the factors in this discrepancy. Turbidity (absorbance at 440 nm) and Fourier transform infrared spectroscopic studies reveal that tamoxifen causes opposite effects on membrane fluidity at low (1 mol.%) and high (30 mol.%) tamoxifen concentrations. Low tamoxifen c...
Ethyl lactate production by hybrid processes: determination of phase diagrams and evaluation of performance of organophilic pervaporation membranes
İnal, Mine; Yılmaz, Levent; Karakaş, Gürkan; Department of Chemical Engineering (2003)
Citation Formats
A. T. Ural, “Zeolite membranes for gas separations: synthesis and transport properties,” Ph.D. - Doctoral Program, Middle East Technical University, 1999.