Yazar "Öksüzoğlu, Ramis Mustafa" için listeleme
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Bifunctional Fe-SBA-15-SO3H Mesoporous Catalysts with Different Si/Fe Molar Ratios: Synthesis, Characterization and Catalytic Activity
Erdem, Sezer; Erdem, Beyhan; Öksüzoğlu, Ramis Mustafa; Çıtak, Alime (Wiley-V C H Verlag GMBH, 2013)Bifunctional Fe-SBA-15-SO3H mesoporous materials with different Si/Fe molar ratios (3, 5, and 7) have been synthesized via a simple direct hydrothermal method and characterized by XRD, N-2-adsorption/desorption, TG/DTG and ... -
Catalytic Applications of Large Pore Sulfonic Acid-Functionalized SBA-15 Mesoporous Silica for Esterification
Erdem, Beyhan; Erdem, Sezer; Öksüzoğlu, Ramis Mustafa (De Gruyter Poland Sp Zoo, 2018)We report the preparation of pore expanded and sulfonic acid functionalized mesoporous silica catalysts by using different kinds of swelling agents such as 1,3,5-trimethyl benzene (TMB), n-decane (D), n-tridecane (TD), and ... -
Characterization of microstructural and morphological properties in as-deposited Ta/NiFe/IrMn/CoFe/Ta multilayer system
Öksüzoğlu, Ramis Mustafa; Sarac, U.; Yıldırım, M.; Çınar, H. (Chinese Society of Metals, 2014)Surface morphology and its relationship with microstructure in Ta/NiFe/IrMn/CoFe/Ta multilayer system deposited by pulsed DC magnetron sputtering have been investigated in dependence of Ta buffer and NiFe seed layer ... -
Deposition potential dependence of composition, microstructure, and surface morphology of electrodeposited Ni-Cu alloy films
Sarac, U.; Öksüzoğlu, Ramis Mustafa; Baykul, M. C. (Springer New York LLC, 2012)Composition, microstructure, and surface morphology of Ni-Cu alloy films electrodeposited at different deposition potentials have been investigated. The microstructural analysis carried out by using X-ray diffraction (XRD) ... -
Determination of thickness, density and roughness of Co-Ni-Al single and multiple layer films deposited by high-vacuum e-beam evaporation on different substrates
Baake, O.; Öksüzoğlu, Ramis Mustafa; Flege, S.; Hoffmann, P. S.; Gottschalk, S.; Fuess, H.; Ortner, H. M. (2006)Thickness, density, surface and interface roughness of Al-Co-Ni single and multiple layer films deposited by high-vacuum e-beam evaporation on different substrates were investigated using X-ray reflectivity (XRR). The ... -
Direct and Postsynthetic Functionalization of Mesoporous B-SBA-15-SO3H Acid Catalyst and Application to Methyl Propionate Esterification
Erdem, Beyhan; Azko, C.; Erdem, Sezer; Öksüzoğlu, Ramis Mustafa (Polish Acad Sciences Inst Physics, 2017)Organic functionality can be added to mesoporous silicates in two ways: either by covalent grafting (postsynthetic) of various functional groups onto the channel walls or by incorporating functionalities directly during ... -
Effect of bias voltage on tunneling mechanism in Co40Fe40B20/MgO/Co40Fe40B20 pseudo-spin valve
Yıldırım, Mustafa; Öksüzoğlu, Ramis Mustafa (Elsevier Science BV, 2015)Bias voltage dependence of tunneling mechanism has been systematically investigated in Co40Fe40B20 (2.1 nm)/MgO (2 nm)/Co40Fe40B20 (1.7 nm) pseudo-spin valve magnetic tunnel junction deposited using the combination of the ... -
Effect of calcination temperature on the structural and magnetic properties of Ni/SBA-15 nanocomposite
Erdem, Sezer; Erdem, Beyhan; Öksüzoğlu, Ramis Mustafa; Çıtak, Alime (Springer, 2015)The effect of calcination temperature on the structural and magnetic properties of Ni/SBA-15 nanocomposite prepared by reductant-impregnation method was studied using SBA-15 mesoporous silica as support. The structure, ... -
Effect of Ta buffer and NiFe seed layers on pulsed-DC magnetron sputtered Ir20Mn80/Co90Fe10 exchange bias
A systematic investigation has been done on the correlation between texture, grain size evolution and magnetic properties in Ta/Ni 81Fe19/Ir20Mn80/Co 90Fe10/Ta exchange bias in dependence of Ta buffer and NiFe seed layer ... -
Effect of Thickness on the Structural, Microstructural, Electrical and Magnetic Properties of Ni Films Elaborated By Pulsed Electrodeposition on Si Substrate
Kacel, T.; Guittoum, A.; Hemmous, M.; Dirican, E.; Öksüzoğlu, Ramis Mustafa; Azizi, A.; Zergoug, M. (World Scientific Publ Co Pte LTD, 2018)We have studied the effect of thickness on the structural, microstructural, electrical and magnetic properties of Ni films electrodeposited onto n-Si (100) substrates. A series of Ni films have been prepared for different ... -
Excited state dynamics of nanocrystalline VO2 with white light continuum time resolved spectroscopy
Kurum, Ulaş; Yağlıoğlu, H. Gül; Küçüköz, Betül; Öksüzoğlu, Ramis Mustafa; Yıldırım, Mustafa; Yagci, A. Murat; Elmali, Ayhan (Elsevier Science BV, 2014)In an attempt to use ultrafast pump probe spectroscopy technique with white light continuum to reveal wavelength dependent dynamics of VO2, bandgap needs to be opened. Therefore, nanostructured amorphous and crystalline ... -
Ferromagnetic resonance and X-ray reflectivity studies of pulsed DC magnetron sputtered NiFe/IrMn/CoFe exchange bias
Ferromagnetic resonance and X-ray specular reflectivity measurements were performed on Ni81Fe19/Ir20Mn80/ Co90Fe10 exchange bias trilayers, which were grown using the pulsed-DC magnetron sputtering technique on Si(100)/SiO2(1000 ... -
FMR study of ultrahigh vacuum e-beam evaporated Co 23Cu 77 nanogranular films: Magnetotransport properties
Öksüzoğlu, Ramis Mustafa; Yalçın, N.; Aktaş, B.; Fuess, H. (2006)The magnetic, magnetotransport and structural properties of Co 23Cu 77 granular thin films (7-43 nm) have been investigated using ferromagnetic resonance (FMR) and high-resolution XRD techniques. Co particles possess a ... -
High-surface-area SBA-15-SO3H with enhanced catalytic activity by the addition of poly(ethylene glycol)
Erdem, Beyhan; Erdem, Sezer; Öksüzoğlu, Ramis Mustafa; Çıtak, Alime (Springer, 2013)The influence of poly(ethylene glycol) (PEG) and synthesis temperature in the synthesis of SBA-15-SO3H was investigated to evaluate the catalytic activity in the esterification of propionic acid with methanol. The catalysts ... -
Influence of Deposition Technique on Growth and Resistivity of Ta/NiFe Nano Films.
Capar, Ogeday; Yıldırım, Mustafa; Çınar, Hakan; Öksüzoğlu, Ramis Mustafa (Int Union Crystallography, 2009)… -
Interface roughness and exchange bias - Coercivity ratio in Pulsed-DC magnetron sputtered NiFe/IrMn/CoFe exchange bias trilayers
Ta/Ru/Ta/Ni81Fe19/Ir20Mn 80/Co90Fe10 exchange bias multilayer was grown by using pulsed DC unbalanced magnetron sputtering technique. The deposition pulse frequency of the NiFe seed layer has been varied between 10 - 50 ... -
Magnetic Mesoporous Silica Nanocomposite for Biodiesel Production
Erdem, S.; Öksüzoğlu, Ramis Mustafa; Avşar, S. B.; Erdem, Beyhan (Polish Acad Sciences Inst Physics, 2017)Ordered mesoporous silicas can be utilized as support because of having large surface area, tunable porosity, uniform pore size distribution, high thermal stability and modifiable properties. However, these materials ... -
Magnetic Nano-Sized Solid Acid Catalyst Bearing Sulfonic Acid Groups for Biodiesel Synthesis
Erdem, Sezer; Erdem, Beyhan; Öksüzoğlu, Ramis Mustafa (De Gruyter Poland Sp Zoo, 2018)In our approach for magnetic iron oxide nanoparticles surface modification, the fabrication of an inorganic shell, consisting of silica by the deposition of preformed colloids onto the nanoparticle surface and functionalization ... -
Modifying ultrafast optical response of sputtered VOX nanostructures in a broad spectral range by altering post annealing atmosphere
Kurum, Ulaş; Yağlıoğlu, H. Gül; Küçüköz, Betül; Öksüzoğlu, Ramis Mustafa; Yıldırım, Mustafa; Yagci, A. M.; Elmali, Ayhan (IOP Publishing LTD, 2015)Nanostructured VOX thin films were grown in a dc magnetron sputter system under two different Ar:O-2 gas flow ratios. The films were annealed under vacuum and various ratios of O-2/N-2 atmospheres. The insulator-to-metal ... -
Preparation, Characterization and Catalytic Properties of SBA-15-SO3H Supported Tungstophosphoric Acid for Esterification Reaction
Erdem, Beyhan; Erdem, Sezer; Çıtak, Alime; Yavru, C.; Öksüzoğlu, Ramis Mustafa (Polish Acad Sciences Inst Physics, 2017)SBA-15-SO3H supported tungstophosphoric acid (TPA, H3PW12O40) mesoporous materials were synthesized by impregnation of TPA into the hydrothermally synthesized SBA-15-SO3H and the catalytic performances were compared for ...
