Profile URL: https://hdl.handle.net/20.500.13091/11608
Job Title:Doç. Dr.
Email Address:zcetinkaya@ktun.edu.tr
Main Affiliation:02.11. Department of Metallurgical and Materials Engineering
Status: Current Staff
ORCID:
0000-0002-4591-2332
0000-0002-4591-2332Scopus ID:
57212081732
57212081732YÖK Akademik: 1F088C7D7C30CB29
Google Scholar:
uCVANfcAAAAJ
uCVANfcAAAAJWeb of Science ID:
JHT-1633-2023
JHT-1633-2023Name Variants:
Çeti̇nkaya, Zeynep Cetinkaya, Zeynep
21 results
Scholarly Output Search Results
Now showing 1 - 10 of 21
Article Densification of CuO-ZrO2 Nanocomposites by Flash Sintering(Sakarya University, 2025) Çetinkaya, ZeynepThis study is a comprehensive investigation into CuO-doped ZrO2 nanoparticles (NPs) produced by the hydrothermal method and its conventional (CS) and flash-sintering (FS) processes. Besides this production, the effect of the differences in sintering techniques and density was investigated to prove the results. However, to the authors’ knowledge, the FS of CuO/ZrO2 nanocomposite (NC) material has yet to be studied, which is the first report on this material. The CuO/ZrO2 nanocomposite particle (NCP) pellet was sintered at 1250 oC for 1 hour using CS. The other sintering method is FS, which obtains highly dense NCs. The CuO/ZrO2 NCPs pellet was successfully produced with the lower sintering temperature (673 oC) and duration (60 seconds) by FS under a current density of 50 mA/mm2, and electric field (100 V/cm). The microstructure and density of the pellets produced from CS and FS experiments were evaluated. The SEM results showed that the CuO/ZrO2 NCPs with the FS experiment were successfully performed, and density results with 4.38 g/cm3 proved this success compared to CS pellet density (3.72 g/cm3). The FS process for CuO/ZrO2 NCPs consumes ~ 2.2 kJ (0.227 kJ/cm³), whereas CS samples require ~ 13 kJ (54 kJ/cm³), making FS approximately six times more energy-efficient. This significant reduction in energy consumption highlights FS as a promising method for future applications focused on carbon emission reduction and energy efficiency.Article Citation - WoS: 4Citation - Scopus: 5Reusing Blended Leach Residue by Flash Sintering Method(Wiley, 2023-12-06) Çetinkaya, Zeynep; Gökhan, Arıcı; Dursun, Sami; Şavklıyıldız, İlyasIn this study, the effects of different sintering methodology on grain formation, density, and hardness of blended leach residue (B-LR) pellets is investigated. For the first time, the flash sintering (FS) method, an environmentally friendly process, is used to make multiphase ceramic composites using B-LR under 100 V/mm at 675 degrees C. The outcomes of this study revealed that the FS process is faster and more energy-efficient than the conventional sintering (CS) methods performed at 800 degrees C for 4 h. The formation of abnormal grain growth is prevented by FS in B-LR material composition after it is exposed to a max power absorption 61.4 mW/mm3 and whole FS is completed less than 100 s. Besides, FS method does not lead to any melting on grain boundaries due to excessive joule heating, compared with the CS sample. It is noted that FS also provides better density and hardness values for this material system along with compositional integrity in this multiphase system. The significant outcome of this study is reducing lead volatility and emission by decrement on the sintering temperature. Ultimately, this study has planned the practicality of reusage and recycle of this material with green, safe, and eco-friendly methods.Other Multi-Step Femtosecond Laser-Fabricated Membranes for Regulated Migration of Biomolecules and Cells(2026) Schneider, Stephanie E.; Denduluri, Akhila Jyothy; Çetınkaya, Zeynep; Ramirez, Izaiah; Whiting, Gregory L.; Gallegos, Shantae; Gopalakrishnan, AnupamAbstract Organ-on-chip (OoC) systems enable the recapitulation of key structural and functional characteristics of human tissues within controlled micro-engineered environments. In mechanically active tissues such as musculoskeletal, cardiac, and vascular systems, the incorporation of dynamic physical forces is essential for replicating the biomechanical cues governing cellular morphology and functional responses in-vivo . Without such stimuli, OoC models may fail to capture physiologically relevant tissue behaviors. Porous and semi-permeable membranes are critical components of OoCs, facilitating selective transport of nutrients, gases, and signaling molecules between cellular compartments to support biologically accurate barrier replication. Hence, fabrication strategies that permit precise modulation of membrane permeability are desirable to accommodate for the varying needs in pore size and porosity across organ systems. This study presents a two-stage fabrication process for stretchable, microporous polydimethylsiloxane (PDMS) membranes using femtosecond (fs-) pulse laser drilling. The laser-ablated pores exhibit a characteristic conical morphology, with diameters tapering from the laser entry to exit point. By modulating laser power and number of pulses, 6-15 μm exit-end pore diameters were achieved in 50 μm thick PDMS films. The membranes demonstrated strong mechanical resilience, with a 5–12% reduction in Young’s modulus after 500 cycles of strain loading. Furthermore, membranes fabricated at lower laser powers exhibited superior retention of elasticity, highlighting the influence of processing parameters on mechanical behavior. Cytocompatibility and permeability assessments confirmed that the membranes supported sustained cell viability and proliferation over at least three days. In size-restricted membrane pore geometries, cellular migration was constrained without any inhibition of biomolecular transport. This selective permeability is critical in multilayer OoC architectures, where a balance between biomolecular diffusion and cellular compartmentalization is necessary to preserve distinct tissue interfaces and functional organization. This work presents fs-laser micro-drilling as a robust and tunable fabrication strategy for producing mechanically resilient, selectively permeable PDMS membranes for physiologically relevant OoC applications.Article Citation - WoS: 4Citation - Scopus: 4Processing Map for Touch-Free Flash Sintering of a Whiteware Ceramic(Wiley, 2024-05-02) Çetinkaya, Zeynep; Raj, RishiFlash sintering has evolved into touch-free sintering, where free-standing workpieces can be sintered without attaching electrodes. Instead, the flash is transmitted from the surface of a reactor into the workpiece with superimposition of a magnetic field. Thus, sintering now depends on two independent parameters: the current used to sustain the flash in the reactor and the current flowing through the induction coil. We present a first report on the influence of these two parameters on the quality of the sintered workpiece. The specimens were made from whiteware, consisting of aggregates of ceramic particles interspersed with particles of a glass phase. The results are presented in a map with the reactor current and the induction current as the control variables. Three regimes are identified: insufficient sintering, good sintering, and the formation of defects. The reactor current emerges as an important variable: densification is poor if it is too low, and defects form if it is too high, with high density achieved in the intermediate regime. High induction currents are needed to achieve good sintering. Touch-free flash sintering has also been shown to sinter and at the same time transform powders of elemental oxides into a single-phase multicomponent ceramic.Other Safety Studies of Contact with Zro2-Sno2-Zrsno4 Composite Nanofibers on the Model Organism: Life Span and Biochemical Effects(2024) Çetınkaya, Zeynep; Güneş, EdaArticle Citation - WoS: 19Citation - Scopus: 21Investigation of Biochemical Properties of Flash Sintered Zro2–sno2 Nanofibers(Elsevier Ltd, 2023-01-01) Çetinkaya, Zeynep; Güneş, Eda; Şavklıyıldız, İlyas; Gunes, EdaZrO2–SnO2 nanocomposition were produced in nanofibers (NFs) form with three various mixing volume ratio by electrospinning technique. The microstructure and morphological characterization of NFs reveals the ternary system of ZrO2–SnO2–ZrSnO4. Furthermore, Band gap structure of NFs was varied with the composition ratio which consequently affect the Flash sintering (FS) event. The FS experiments were utilized under thermal (844–878 °C) and electric field (420 V/mm) with 3.77 mA/mm2 current cutoff. Highly dense nanocomposition were obtained in less than 80secs with a max power absorption of 1.58 W/mm3. Thanks to low sintering temperature and time, nanostructured surface morphology were acquired which is crucial for biochemical properties of nanocompositions. Drosophila melanogaster food was covered with sintered nanocompositions and the control food. The toxicity of the nanomaterial in the insect, survival rate(%), development time(days) were investigated. In order to support the results, biochemical analyzes (total oxidative level-TOS, total antioxidant level-TAS and oxidative stress index-OSI) were performed in adults. In addition, antimicrobial activity was evaluated with Escherichia coli and Staphylococcus aureus. It was determined that the nanomaterials had an antimicrobial effect along with non-toxic effect on the insect. Besides, it did not change the survival rate of the insect in all groups. Although there was a one-day difference in development times, it did not cause a statistical change in the OSIs of female and male individuals. We believe that the synthesized nanocompositions can be used as a valid candidate in the healthcare system, such as dental implants, due to its antimicrobial effect and non-toxicity in the model organism. © 2022 Elsevier B.V.Article Citation - WoS: 1Citation - Scopus: 2Investigation of Reusing Copper Converter Slag Residue With the Flash Sintering Method(Springer, 2023-10-16) Çetınkaya, Z.For the first time, flash sintering (FS), an economical, fast, and environmentally friendly process, was conducted and suggested for reusing copper converter slag (CCS) to produce multi-phase ceramics under the 12.5 V/mm, 25 V/mm, 50 V/mm, and 75 V/mm. The effect of the electric field used for FS on grain growth, hardness, and density of CSS was investigated. FS was faster and employed at lower temperatures (431.3°C) compared with the conventional processes (1250°C). The increment of applied voltage during FS significantly improved the density of the CCS samples along with impinged grain growth. FS, completed in approximately 30–60 s after the current draw, is observed through the sample. Besides, the superior hardness and density values of the CCS pellets are acquired when the electric field is 50 V/mm. FS also triggers the formation of new phases, which is not the case for conventional sintering. Overall, FS can be used as a green processing by reducing sintering time and temperature in this materials system. © 2023, The Minerals, Metals & Materials Society.Article Reusing Cast Iron Slag Waste as a Material Development by Flash Sintering(Springer, 2025-04-07) Cetinkaya, Zeynep; Arici, Gokhan; Ozturk, BenginurThe materials sintered with FS are determined by considering temperature, time, energy, cost, environmental pollution, and human health. In this study, cast iron slag wastes (CISW) were utilized in powder form and sintered using flash sintering (FS). The outcomes of both FS and conventional sintering (CS) processes were assessed regarding their physical, chemical, and mechanical properties. The CS process was performed at 1000 degrees C for 4 h. FS experiments were conducted under 20, 25, and 30 V/mm electric fields. CISW was sintered using the FS method resulting in lower temperatures and shorter processing times, thus yielding energy savings. Through this method, it was observed that the interatomic spaces narrowed due to the electric field and temperature applied to the sample. Physical, chemical, and mechanical tests (3-point bending and hardness) were carried out on all sintered materials. Experimental results indicated that the sample sintered under the 20 V/mm electric field at 517 degrees C for 15 s exhibited better mechanical properties compared to CS. On the other hand, the sample flash sintered under 30 V/mm electric field had lower temperatures (478 degrees C) compared to all FS processes that were carried out with perfect intergranular interactions. However, the mechanical properties were lower than the others because the structures may have passed into the liquid phase. Consequently, it has been proven that this product obtained from CISWs can be used in floor and wall tiles according to ISO10545-4 and BS-EN14411:2016 standards. It has better mechanical strengths than all other sintering processes with FS under 20 V/mm electric field.Article Citation - WoS: 7Citation - Scopus: 10Flash Sintering Effect on Fly Ash Microstructure(Gazi Univ, Fac Engineering Architecture, 2021-11-10) Cetinkaya, ZeynepIn this study, densification of fly ash, (FA, industrial waste glass ceramic material) powder is carried out by electric field assisted flash sintering method. FA obtained from Tuncbilek Thermal Power Plant (Kutahya, Turkey). During the flash sintering experiment, 450 V/mm electric field is applied on sample with 0.85 amp current cutoff value. Flash sintering is accomplished in 70 sec at approximate to 1137 degrees C. According to XRD analysis, glassy phase, quartz, hematite, magnetite, magnesioferrite and mullite structures are in the structure. Based on the results of chemical analysis (XRF), reported in the literature, the sintering of ceramic materials formed by SiO2, Al2O3 and Fe2O3 individually or all together occurs at temperatures of 1500 degrees C and above. By electric field assisted flash sintering technique, the sintering temperature is decreased from 1500 to 1137 degrees C along with a decrement in sintering time from 3 hours to 70 seconds. The sintering process with this method was performed at a lower temperature and in a shorter time than traditional sintering methods. With the SEM micrographs, it has been proven that fly ash flash sintering processes have a denser structure compared to the conventional sintering.Article Citation - WoS: 21Citation - Scopus: 22In Situ Reduction of Chloroauric Acid (haucl4) for Generation of Catalytic Au Nanoparticle Embedded Triazine Based Covalent Organic Polymer Networks(ROYAL SOC CHEMISTRY, 2019) Dursun, Sami; Yavuz, Emine; Çetinkaya, ZeynepCovalent-organic polymer networks (COPNs) have been used as catalyst supports due to their stable and favorable structure. Herein, a simple synthetic route was applied to generate Au@COPN-1 hybrids via in situ reduction of gold ions with no additional reducing agent. Synthesized novel COPN-1 was mixed with different concentrations of HAuCl4 which resulted in Au@COPN-1 with varying sizes of Au nanoparticles in a controlled manner. The microstructural and morphological features of COPN-1 and Au@COPN-1 were characterized in detail using FT-IR, C-NMR, elemental analysis, UV-Vis, XRD, TEM, BET, and TGA. It is noteworthy that the red-shifted LSPR peaks of Au nanoparticles produced with increasing concentrations of HAuCl4 indicated an increase in the particle size of the Au nanoparticles as justified by TEM images. The optimum catalytic activity of Au@COPN-1 was obtained when 4.6 x 10(-3) mM HAuCl4 was used, which led to the complete reduction of 4-nitrophenol within 16 minutes with excellent recyclability for more than 5 catalytic cycles, giving yields over 94%. Moreover, the non-aggregation of nanoparticles in the reused catalyst further confirmed the stability of the prepared catalysts. Consequently, these results indicated that in situ synthesis of AuNPs inside the COPN-1 matrix produces a promising catalyst platform for the reduction of aromatic nitro compounds, for example, for the degradation of one of the most common persistent organic pollutants 4-nitrophenol, as shown here. In addition, the Au@COPN-1 hybrid system showed good biocompatibility at appropriate doses confirmed by a dynamic real-time cell analysis system which can be used in various medical applications, such as drug delivery, in the future.
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Research Topics
Domains
Physical SciencesSocial Sciences
Fields
Materials ScienceEngineeringArts and HumanitiesSocial Sciences
Subfields
Ceramics and CompositesMechanical EngineeringPhilosophyEducationBiomaterials
Specific Research Areas
Advanced ceramic materials synthesis
Advanced materials and composites
Education Practices and Challenges
Educational Methods and Analysis
Electrospun Nanofibers in Biomedical Applications
Sustainable Development Goals
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
7AFFORDABLE AND CLEAN ENERGY
2
Research Products
3GOOD HEALTH AND WELL-BEING
2
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
6CLEAN WATER AND SANITATION
1
Research Products
Documents
17
Citations
82
h-index
5
Documents
16
Citations
73
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 18 |
| University of Colorado Boulder | 6 |
| Selçuk University | 4 |
| Necmettin Erbakan University | 3 |
| University of Colorado System | 1 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| International Journal of Applied Ceramic Technology | 3 |
| JOM | 2 |
| Materials Chemistry and Physics | 2 |
| JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY | 1 |
| Journal of Pharmaceutical Innovation | 1 |
Current Page: 1 / 4
Scholarly Output
21
Articles
18
Views / Downloads
52/31
Supervised MSc Theses
1
Supervised PhD Theses
0
WoS Citation Count
74
Scopus Citation Count
82
Patents
0
Projects
0
WoS Citations per Publication
3.52
Scopus Citations per Publication
3.90
Open Access Source
9
Supervised Theses
1
Scopus Quartile Distribution
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