Aysin, Basak
Öztürk, Abdullah
The present study was undertaken to improve photocatalytic efficiency of TiO2 powder by silver doping and/or particle size reduction through mechanical ball milling. A planetary ball mill was employed to reduce the particle size of TiO2 powders to nanoscale and silver loading to TiO2 powders. Silver nitrate was used as silver source to obtain about 1% Ag load. Slurry taken from ball mill was separated by centrifugal separator into nano and micro sols. Separated nanosol was taken into the furnace to be dried at 103 degrees C and calcined at 400 degrees C for 1 hour to assist silver loading. X-Ray powder diffraction (XRD) was employed to identify the crystalline phases present in the powders produced. XRD results revealed that doped TiO2 powders were consisted of only anatase phase of TiO2. Changes in lattice parameters of TiO2 structure after doping were determined also by XRD. Scanning Electron Microscope (SEM) and particle size analyzer were used for examining the size reduction effect of ball milling process. Photocatalytic performance of the powders was evaluated by Methylene Orange (MO) test under UV light illumination using UV-Spectrophotometer.


Production and characterization of surface treated biomedical Ti6Al7Nb alloy foams /
Bütev, Ezgi; Bor, Şakir; Esen, Ziya; Department of Metallurgical and Materials Engineering (2015)
The current study was undertaken to investigate the production and surface processing of biomedical Ti6Al7Nb alloy foams. Space holder method was utilized to manufacture foams with varying porosities around 53.0-73.0 vol. % via evaporation of magnesium from compacted Ti6Al7Nb-Mg powder mixtures. Bioactivities of foam surfaces were further enhanced by obtaining sodium rich phases using NaOH alkali-heat treatment method. Moreover, untreated and surface treated foams were tested in simulated body fluid (SBF) i...
Production and characterization of porous titanium alloys
Esen, Ziya; Bor, Şakir; Department of Metallurgical and Materials Engineering (2007)
In the present study, production of titanium and Ti6Al4V alloy foams has been investigated using powder metallurgical “space holder technique” in which magnesium powder were utilized to generate porosities in the range 30 to 90 vol. %. Also, sintering of titanium and Ti-6Al-4V alloy powders in loose and compacted condition at various temperatures (850-1250oC) and compaction pressures (120-1125 MPa), respectively, were investigated to elucidate the structure and mechanical properties of the porous cell walls...
Processing of titanium foams using magnesium spacer particles
Esen, Z.; Bor, S. (2007-03-01)
Production of titanium foams using magnesium powders as spacer particles has been investigated. Titanium foams having porosities in the range 45-70% with an average pore size of around 525 mu m have been manufactured. The resultant yield strength and elastic moduli values were observed to vary in the range 15-116 MPa and 0.42-8.8 GPa, respectively. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Production of high sulfur forging steels at Çemtaş steel plant
Gitmez, Cenk; Sevinç, Naci; Department of Metallurgical and Materials Engineering (2003)
This study was undertaken with the objective of determining the operation practice to be followed in production of forging quality aluminum killed steels with high sulfur contents in Çemtaş Steel Plant. Nowadays, many steel grades used in the automotive industry are required both to have improved rracliining characteristics and to be fully killed, Le. deoxidized with aluminum. The product which is manufactured as hot-rolled bars in steelmaking company is shaped with forging process and then, subjected to a ...
Production of nanofibers by electrospinning for interfacial toughening of composites
Özçınar, Zeynep Cansu; Bat, Erhan; Department of Chemical Engineering (2019)
In this work, electrospinning technique was selected for the production of nanofiber mats to be used in improving the fracture toughness of carbon fiber reinforced composites. The main purpose of this study is to improve GIC delamination mode of polyamide-6 (PA6) nanofibers interleaved carbon fiber reinforced polymer (CFRP) composite. Many studies [1]-[4] have shown that when PA6 nanofiber is used as an interleaving material for improving delamination modes of composites GIIC sliding mode could be significa...
Citation Formats
B. Aysin, J. PARK, and A. Öztürk, “PRODUCTION OF SILVER LOADED PHOTOCATALYTIC TIO2 POWDERS BY BALL MILLING,” 2011, Accessed: 00, 2020. [Online]. Available: