Fabrication of cross-linked Polybenzimidazole membranes for high temperature PEM fuel cells and investigation of the amount of cross-linker used on membrane performance

Özdemir, Yağmur
Özkan, Necati
Devrim, Yılser


Fabrication of helical polymeric hollow fiber membranes and characterization of their fouling behaviours
Yücel, Hazal; Çulfaz Emecen, Pınar Zeynep; Department of Chemical Engineering (2018)
Membranes are used in many separation processes such as gas separation, microfiltration, ultrafiltration and hemodialysis. Hollow fiber membranes are advantageous since they have a high surface area per volume and are easily backwashed which is an advantage for fouling removal. The most important factors that affect the performance of filtration membranes are concentration polarization and fouling. They increase operational cost and reduce membrane lifetime and permeate flux. One approach that can reduce co...
Fabrication of functionalized citrus pectin/silk fibroin scaffolds for skin tissue engineering
Türkkan, Sibel; Atila, Deniz; Akdağ, Akın; Tezcaner, Ayşen (Wiley, 2018-10-01)
In this study, novel porous three-dimensional (3D) scaffolds from silk fibroin (SF) and functionalized (amidated and oxidized) citrus pectin (PEC) were developed for skin tissue engineering applications. Crosslinking was achieved by Schiff's reaction in borax presence as crosslinking coordinating agent and CaCl2 addition. After freeze-drying and methanol treatment, plasma treatment (10 W, 3 min) was applied to remove surface skin layer formed on scaffolds. 3D matrices had high porosity (83%) and interconnec...
Fabrication of interdigitated back-contact (IBC) solar cells with screen-printed boron doped emitters
Aliefendioğlu, Ateşca; Turan, Raşit; Department of Physics (2020)
Interdigitated back-contact (IBC) solar cells with their unique structure, having both n and p doped regions as well all as contacts at the rear side, have the potential to achieve high-efficiency values. The record efficiency value at industrial scale have reached 25.2% for mono-crystalline silicon. This thesis focuses on the development of IBC cell structure which is one of the best performing cell structures. The scope of this thesis requires the full understanding of controlling the boron doping on an n...
Fabrication and Characterization of Gold-Tin Eutectic Bonding for Hermetic Packaging of MEMS Devices
DEMIR, Eyup Can; TORUNBALCI, M. Mert; DONMEZ, Inci; Kalay, Yunus Eren; Akın, Tayfun (2014-12-05)
This paper presents the fabrication of wafer-level hermetic encapsulation for MEMS devices using low-temperature (300 degrees C) Au-Sn bonding together with their pre- and post-bonding characterization. Thermal evaporation method was used for metallization which is easy and controllable method for low thickness metallization. In this respect, the current study represents preliminary characterization results of Au-Sn pre-and post-bonding with an average thickness of less than 1.5 mu m processed by thermal ev...
Fabrication and analysis of dye-sensitized solar cells (DSSCs) using porphyrin dyes with catechol anchoring groups
Adineh, Maryam; Tahay, Pooya; Ameri, Mohsen; Safari, Nasser; Mohajerani, Ezeddin (2016-01-01)
Herein we report the preparation and application of 4 different zinc(II) tetrakis(dihydroxyphenyl) porphyrins (ZnTDHPP) as the sensitizing dyes in dye-sensitized solar cells (DSSCs). The experimental results include solution and solid state UV-Vis data, steady state current-voltage characteristics, and our theoretical analysis comprised of density functional theory (DFT) and Langmuir isotherm adsorption formalism. The results show that the Zn tetrakis(2,3-dihydroxyphenyl) porphyrin (Zn2,3TDHPP) and Zn tetra...
Citation Formats
Y. Özdemir, N. Özkan, and Y. Devrim, “Fabrication of cross-linked Polybenzimidazole membranes for high temperature PEM fuel cells and investigation of the amount of cross-linker used on membrane performance,” 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/78482.