Özgen, İsmet Tamerkan
Loading...
Profile URL
Name Variants
Özgen, Tamerkan
Özgen, İ.T.
Özgen, T.
Özgen, İ.T.
Özgen, T.
Job Title
Email Address
Main Affiliation
04.01. Department of Chemistry
Status
Former Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
2
Research Products
3GOOD HEALTH AND WELL-BEING
0
Research Products
4QUALITY EDUCATION
0
Research Products
5GENDER EQUALITY
0
Research Products
6CLEAN WATER AND SANITATION
4
Research Products
7AFFORDABLE AND CLEAN ENERGY
5
Research Products
8DECENT WORK AND ECONOMIC GROWTH
0
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
5
Research Products
10REDUCED INEQUALITIES
0
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
0
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
5
Research Products
13CLIMATE ACTION
5
Research Products
14LIFE BELOW WATER
2
Research Products
15LIFE ON LAND
2
Research Products
16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
17PARTNERSHIPS FOR THE GOALS
0
Research Products
This researcher does not have a Scopus ID.
This researcher does not have a WoS ID.
Scholarly Output
6
Articles
0
Views / Downloads
10096/2089
Supervised MSc Theses
5
Supervised PhD Theses
0
WoS Citation Count
0
Scopus Citation Count
0
Patents
0
Projects
0
WoS Citations per Publication
0.00
Scopus Citations per Publication
0.00
Open Access Source
5
Supervised Theses
5
| Journal | Count |
|---|---|
| Selected Topics in Mass Spectrometry in the Biomolecular Sciences | 1 |
Current Page: 1 / 1
Scopus Quartile Distribution
Quartile distribution chart data is not available
Competency Cloud
6 results
Scholarly Output Search Results
Now showing 1 - 6 of 6
Conference Object Optimization of Mass Spectrometric Ionisation Efficiency Data(Springer Verlag, 1997) Özgen, İsmet Tamerkan; Altungöz, Oya; Salih, B.; Vandeginste, B. G. M.A new method is developed and tested to find out the excited electronic and vibrational energy levels (fine structure) of molecules from mass spectrometric ionisation efficiency data which were obtained by a conventional mass spectrometer ion source having normal electron energy distribution. Electrons emitted in a conventional mass spectrometer ion source are not monoenergetic, therefore, evaluation of Ionisation Potentials (IF) and Appearance Potentials (AP) from experimental data creates some problems. This is even worse in the evaluation of Fine Structure (excited electronic and vibrational energy levels) from ionisation efficiency data [1]. This is overcome either by using specially designed monoenergetic ion sources which have their own problems (manufacture of special design, difficulty of operation, too much decrease of ion current), or by eliminating disturbing effects in the ionisation efficiency data by some deconvolution techniques [2,4,5,6,7,9]. In this study attempts were made to eliminate the deteriorating effects (mainly arising from electron energy distribution and noise) in the ionisation efficiency data by a deconvolution technique. The technique was applied to the ionisation efficiency data of molecular nitrogen,oxygen and methylammine and its fragment and interesting results were obtained.Master Thesis Synthesis and Characterization of Mgb2 Superconducting Wires(Izmir Institute of Technology, 2008) Horzum Polat, Nesrin; Özgen, TamerkanIn this study, the superconducting properties of laboratory synthesized MgB2 was investigated. In the first part, MgB2 synthesis using commercial magnesium and boron (95-97% purity), and its microstructural and electrical characterization was investigated.Effects of sheath material and annealing temperatures were also examined. The microstructural studies showed that when Cu tubes were used as sheath material, MgCu2 forms instead of MgB2 even at 700oC, while on Fe clad cores, the major phase was MgB2 with minor MgO constituent. The transition temperatures of Fe clad wires were measured between 39K and 40K, whereas no transition temperature was observed for Cu clad wires. The Ic value of the Fe clad MgB2 wire was about 25 A at 4K, while the copper clad wire could not carry current and formed resistance. In Fe clad wires, better results were obtained at annealing temperature of 800°C for 30 minutes. In the second part, MgB2 synthesis using commercial magnesium and boron (90% purity) was tried. 0-5-10-15 wt% of Mg doping and, additionally annealing temperatures were examined. Powder-In-Tube method was used for wire production. 10 wt% Mg addition was seen to be beneficial as compared to the stoichiometric MgB2. 750°C was found to be the most suitable temperature for the formation of MgB2 phase. The Ic value of the wire was measured as 13 A at 4K and it showed a broader transition with non-zero resistivity, transition temperature of 24K.In the third part, 200 m long four filament MgB2/Cu wire was successfully produced in laboratory conditions.Master Thesis Investigation of the Reaction of Boron Oxide With Aluminium Powder and Method Development for Boron Determination in the Reaction Mixture(İzmir Institute of Technolog, 2007) Demirsar, Yelda; Özgen, TamerkanIn this study, a cheap method for the synthesis of elemental boron by the reduction of boron oxide with aluminum was investigated. However after various optimization studies, detectable boron amounts could not be found in the reaction mixtures by XRD and SEM-EDX analysis. Meanly aluminum borates were formed as products and these products were leached by 6 M HCl, however removel of borates could not be achieved. We think that the reason of this outcome is that we worked with simple experimental setup, therefore could not achieving the suitable experiment conditions and because of this we failed in the sythesis of boron. In the second part of the study, a new method for the direct determination of boron was investigated. 96 %pure boron and KBr were mixed and analyzed with Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). No distinct differences for boron was observed in the DRIFT spectra. Then, different sample compositions were prepared with different amounts of boron and KBr. These samples were split as validation and calibration sets and their spectra were collected by DRIFTS. All collected spectral data were processed in a different computer where the data proccessing programs were installed. The genetic inverse least square (GILS) method was used inorder to generate calibration model. Results obtained showed that boron amounts could be directly determined with maximum 3-4 % error. Afterwards, same procedure was also tried for boron and boron oxide binary mixtures and boron, boron oxide and aluminum ternary mixtures. In the binary mixture, determination of boron could be successfully achieved, however boron oxide determination could not be achieved as good as boron determination. In the ternary mixture, better results were obtained compared to binary mixture. Finally, the method was tried with the original samples, but not very satisfactory results were obtained. We think this result is due to the malfunction of FTIR instrument and personal error in the preparation of similar samples. More sample preparation and measurement could not be achieved because the FTIR instrument is not functioning at present.Master Thesis Investigation of Dicofol and Endosulfan Pesticide Levels in Tahtalı Dam Water or Drinking Water(Izmir Institute of Technology, 2004) Sazova, Yeliz; Özgen, TamerkanIn this study, dicofol (2,2,2-trichloro-1,1-bis (4-chlorophenyl) ethanol) and endosulfan (6,7,8,10,10 - hexachloro - 1,5,5,1,6,9,9a - hexahydro - 6,9 - methano - 2,4,3 benzadioxathiepin 3-oxide) pesticide concentration levels in Tahtalı Dam Water were investigated. Endosulfan pesticide has two forms which are -Endosulfan and Endosulfan. Dicofol and Endosulfan are both organochlorine pesticides. Both of these pesticides are widely used for agricultural purposes in Tahtalı Dam Basin. These pesticides could be carried to the Tahtalı Dam Water, and therefore their concentrations should be controlled. Another reason why these pesticides were selected was that their method of determination is not straightforward and a special determination technique has to be used. That is why these pesticides were not studied extensively for zmir area. For the determination of trace amount of above-mentioned pesticides, gas chromatography-mass spectrometry (GC-MS) was generally preferred as reported in most papers [1-3]. The GC-MS instrument in our laboratory has an Ion Trap (IT) mass analyzer. Operating in Selected Ion Storage (SIS) or Tandem mass (MS-MS) modes can increase the sensitivity and selectivity of this instrument. The matrix effect coming from the aqueous solution was eliminated by GC-SIS-MS and GC-MS-MS. Dicofol did not give stable peaks. So, Dicofol did not investigate in this study. The detection limits of the instrument are 0.083 g/L for -Endosulfan, and 0.662 g/L for -Endosulfan; therefore a preconcentration process was required because the studied concentrations are in 1-3 g/L levels for surface water and 0.1 g/L levels for drinking water. Solid Phase Extraction (SPE) method was used for sample preconcentration. Gas chromatography (GC) - Mass spectrometry (MS) and Tandem mass spectrometry (MS.MS) were employed for the identification and quantification of Dicofol, -Endosulfan, and Endosulfan pesticides. For SPE procedure ENVI-18 Disk was used, optimizing the extraction volume, pH and the salt concentration. In GC.MS.MS, the lowest detectable concentrations for the -Endosulfan and -Endosulfan were found as 0.083 ng/L and 0.662 ng/L, respectively. Recovery of -Endosulfan for SPE was 112 (0.002) % in 500 ml water samples spiked with 1 mg/L pesticides. Recovery of the Endosulfan for SPE was 132 (0.008) % in 500 ml water samples spiked with 1 mg/L pesticides.Master Thesis Synthesis of Magnesium Hydride and Sodium Borohydride at Low Temperatures(Izmir Institute of Technology, 2006) Akyol, Emel; Özgen, TamerkanIn this study, experimental conditions for production of magnesium hydride and sodium borohydride by low temperature grinding are investigated. In the first set of experiments, it was attempted to confirm the information presented in the literature that magnesium hydride could be produced by heating at 350oC for 24 hours under 10 atmospheres of pressure. The results obtained in this study indicated that even a higher temperature heating at 400oC under 10 bar hydrogen pressure was insufficient for magnesium hydride formation. Heating and grinding time were selected as the most effective parameters by which a full-factorial experimental design methodology was implemented. Statistical analysis results indicated that a combination of grinding and a 50oC heating was most effective. Hence, grinding was identified as the most significant factor effect on the production of magnesium hydride. Two different mills were used, in this study, and it was found that disc mill was more effective than ball mill. Different combinations of dehydrated borax, sodium carbonate, magnesium, hydrogen gas, sodium hydride and sodium metaborate were tested without success to produce sodium borohydride. In the final set of experiments, sodium borohydride could be successfully produced by using trimethyl borate and sodium hydride in a disc mill at 50oC under 10 bars hydrogen pressure.Master Thesis Investigation of Dichlorvos (ddvp) and Trifluralin Pesticide Levels in Tahtalı Dam Water(Izmir Institute of Technology, 2002) Erdoğan, Murat; Özgen, TamerkanIn this study, dichlorvos (Dimethyl 2,2-dichlorovinyl phosphate - DDVP) and trifluralin (.,.,.-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidin) pesticide concentration levels in Tahtalı Dam Water were investigated. Dichlorvos is an organophosphorus pesticide, whereas Trifluralin is a dinitroaniline pesticide.Both of these pesticides are widely used for agricultural purposes in Tahtalı Dam Basin. These pesticides could be carried to the Tahtalı Dam Water, and therefore their concentrations should be controlled.Another reason why these pesticides were selected was that, their method of determination was not straightforward and special determination technique has to be used. That is why these pesticides were not studied extensively for İzmir area.For the determination of the above-mentioned pesticides, gas chromatographymass spectrometry (GC-MS) was generally preferred as reported in most papers [1,2,3].The GC-MS instrument in our laboratory has an Ion Trap (IT) mass detector. Operating in Selected Ion Storage (SIS) or Tandem mass (MS-MS) modes can increase the sensitivity and selectivity of this instrument. The matrix effect coming from the aqueous solution was eliminated by GC-SIS-MS and GC-MS-MS. The detection limits of the instrument are 0.8 .g/L for trifluralin and 10.5 .g/L for dichlorvos, therefore a preconcentration process was required because the studied concentrations are in 1-3 .g/L levels for surface water and 0.1 .g/L levels for drinking water.Liquid-Liquid Extraction (LLE) and Solid Phase Extraction (SPE) methods were used for sample preconcentration. Gas chromatography (GC) - Mass spectrometry (MS) and Tandem mass spectrometry (MS.MS) were employed for the identification and quantification of Trifluralin and Dichlorvos (DDVP) pesticides. For Solid Phase Extraction procedure ENVI-18 Disk was used, optimizing the extraction volume, pH and the salt concentration. Liquid-Liquid extraction procedure was also used, optimizing the extraction volume. In GC.MS.MS, the lowest detectable concentrations for the Trifluralin and Dichlorvos were found as 0.8 ng/L and 10.5 ng/L, respectively.Recovery of Dichlorvos for Liquid-Liquid Extraction and Solid Phase Extraction were 86.0 (±5.4) % and 63.0 (±5.7) % in water samples spiked with 200 ng/L pesticides.Recovery of the Trifluralin for Liquid-Liquid Extraction and Solid Phase Extraction were 90.8 (±9.4) % and 107.5 (±4.5) % in water samples spiked with 200 ng/L pesticides.Water samples, which were collected between 01 June 2002 to 30 September 2002 by İZSU (İzmir Büyükşehir Belediyesi Su ve Kanalizasyon Genel Müdürlüğü), were analyzed using GC-MS system with tandem mass (MS-MS) mode after preconcentration process. Analysis of samples showed no detectable Trifluralin and Dichlorvos levels in Tahtalı Dam Water.