Kap, Özlem
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Kap, O.
Kap, Ozlem
Kap, Ö.
Kap, Ö
Kap, O
Kap, Ozlem
Kap, Ö.
Kap, Ö
Kap, O
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03.09. Department of Materials Science and Engineering
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Former Staff
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Sustainable Development Goals
1NO POVERTY
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2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
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7AFFORDABLE AND CLEAN ENERGY
3
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
2
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10REDUCED INEQUALITIES
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11SUSTAINABLE CITIES AND COMMUNITIES
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
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13CLIMATE ACTION
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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Documents
12
Citations
215
h-index
8
This researcher does not have a WoS ID.
Scholarly Output
6
Articles
5
Views / Downloads
5057/2616
Supervised MSc Theses
0
Supervised PhD Theses
1
WoS Citation Count
72
Scopus Citation Count
82
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0
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0
WoS Citations per Publication
12.00
Scopus Citations per Publication
13.67
Open Access Source
5
Supervised Theses
1
| Journal | Count |
|---|---|
| Journal of Physical Chemistry C | 2 |
| Applied Surface Science | 1 |
| Journal of Materials Science: Materials in Electronics | 1 |
| Turkish Journal of Chemistry | 1 |
Current Page: 1 / 1
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6 results
Scholarly Output Search Results
Now showing 1 - 6 of 6
Article Citation - WoS: 31Citation - Scopus: 34Dual Remediation of Waste Waters From Methylene Blue and Chromium (vi) Using Thermally Induced Zno Nanofibers(Elsevier, 2020) Elhousseini, Mohamed Hilal; Isık, Tuğba; Kap, Özlem; Verpoort, Francis; Horzum, NesrinElectrospun zinc oxide (ZnO) nanofibers have been significantly improved via a simple heat treatment modification. The present work reports an intriguing cost-effective microstructure tuning, by drastically dropping the temperature of the calcined sample during the cooling period, to get highly photocatalytically active ZnO nanofibers. The calcination temperatures are deducted from thermogravimetric analysis, the phase and purity are confirmed by X-ray diffraction, while the morphology and texture have been revealed by field emission scanning electron microscopy and high-resolution transmission electron spectroscopy. X-ray photoelectron spectroscopy was conducted to get further insight on the surface composition and oxidation states, while N-2-adsorption isotherms were analyzed using the Brunauer-Emmet-Teller methodology. The crystallinity, surface area, and porosity of the ZnO nanofibers, as well as the exposure of active sites, have been enhanced by the rapid cooling method. Photodegradation activity toward methylene blue was improved from 88% to 94%, and 85% to 97%, for free cooled and rapid cooled samples calcined at 300 degrees C and 500 degrees C respectively. The adsorption of chromium (VI) was also tested and reached around 85 mg/g at 100 ppm without being saturated, thereby highlighting one of the most cost-effective performance-enhancing modifications so far that could be extended on different metal oxide nanomaterials.Article Citation - WoS: 11Citation - Scopus: 11Structural Stability of Physisorbed Air-Oxidized Decanethiols on Au(111)(American Chemical Society, 2020) Kabanoy, Nikolai; Tsvetanova, Martina; Klaysyuk, Andrey L.; Zandvliet, Harold J. W.; Sotthewes, Kai; Kap, Özlem; Varlıklı, CananWe have studied the dynamic behavior of decanethiol and air-oxidized decanethiol self-assembled monolayers (SAMs) on Au(111) using time-resolved scanning tunneling microscopy at room temperature. The air-oxidized decanethiols arrange in a lamellae-like structure leaving the herringbone reconstruction of the Au(111) surface intact, indicating a rather weak interaction between the molecules and the surface. Successive STM images show that the air-oxidized molecules are structurally more stable as compared to the nonoxidized decanethiol molecules. This is further confirmed by performing current-time traces with the feedback loop disabled at different locations and at different molecular phases. Density function theory calculations reveal that the diffusion barrier of the physisorbed oxidized decanethiol molecule on Au(111) is about 100 meV higher than the diffusion barrier of a chemisorbed Au-decanethiol complex on Au(111). A two-dimensional activity map of individual current-time traces performed on the air-oxidized decanethiol phase reveals that all the dynamic events take place within the vacancy lines between the air-oxidized decanethiols. These results reveal that the oxidation of thiols provides a pathway to produce more robust and stable self-assembled monolayers at ambient conditions.Article Citation - WoS: 8Citation - Scopus: 13Anticorrosion Coating for Magnesium Alloys: Electrospun Superhydrophobic Polystyrene/Sio2 Composite Fibers(TUBITAK, 2018) Horzum Polat, Nesrin; Kap, Özlem; Farzaneh, AmirSuperhydrophobic nanocomposite coatings for magnesium surfaces with remarkable corrosion resistance were fabricated by electrospinning in the presence of fluorosilane-functionalized silica (SiO2) nanoparticles. The effects of surface-modified silica (mod-SiO2) nanoparticles on the superhydrophobicity and corrosion resistance of polystyrene (PS)/mod-SiO2 fiber coatings were evaluated. The incorporation of the SiO2 nanoparticles endows PS fibers with rough surfaces exhibiting a water contact angle (WCA) of 165◦. The surface wettability, corrosion resistance, and their relation to the inorganic content in the PS fibers and the contact angle of the composite coatings were explored. Analysis of the corrosion results confirmed that the PS/mod-SiO2 coating protected the Mg surface from corrosion. In addition, PS fibers containing mod-SiO2 nanoparticles showed improved hydrophobicity, and excellent corrosion resistance was achieved with PS fibers containing 4 wt% SiO2 nanoparticles.Article Citation - WoS: 12Citation - Scopus: 12Ordering of Air-Oxidized Decanethiols on Au(111)(American Chemical Society, 2018) Sotthewes, Kai; Kap, Özlem; Wu, Hairong; Thompson, Damien; Huskens, Jurriaan; Zandvliet, Harold J. W.Self-assembled monolayers (SAMs) of alkanethiols on gold are a commonly used platform for nanotechnology owing to their ease of preparation and high surface coverage. Unfortunately, the gold-sulfur bond is oxidized at ambient conditions which alters the stability and structure of the monolayer. We show using scanning tunneling microscopy and X-ray photoelectron spectroscopy that decanethiolate molecules oxidize into decanesulfonates that organize into a hitherto unknown striped phase. Air-exposed SAMs oxidize, as can be determined by a shift of the S 2p peak and the appearance of O 1s photoelectrons as part of the decanethiol monolayer transforms into a lamellae-like decanesulfonate structure when exposed to air. The herringbone structure of the Au(111) surface is preserved, indicating that the interaction between the molecules and the surface is rather weak as these findings are substantiated by density functional theory calculations.Doctoral Thesis Structural and Electronic Properties of Organic Layers on Au(111)(Izmir Institute of Technology, 2018) Kap, Özlem; Varlıklı, Canan; Çelebi, CemSelf-assembled monolayers (SAMs) have attracted attention due to their chemical and structural properties providing numerous new applications such as molecular electronics and electrochemistry. SAMs were optimized by experimental techniques including Scanning Tunneling Microscope (STM), Scanning Tunnelling Spectroscopy (STS), X-Ray Photoelectron Spectroscopy (XPS), Polarization-Modulation Infrared Reflection-Absorption Spectroscopy (PM-IRRAS), Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS). The first part of this dissertation deals with the dynamic behaviour of decanethiol SAMs. The dynamic behaviour alkanethiols SAM is unique for its configuration giving indirect evidence for the structural ordering within the formation. Structural stability of decanethiol (decanesulfonates) SAMs were investigated by space- and time- resolved STM. Decanesulfonate phase shows less dynamic behaviour and is structurally more stable compared to the decanethiol phases. The second part of this dissertation describes the binding properties of alkyne molecules adsorbed on gold. Alkyne oxidation occurs at ambient conditions but it is found that unlike thiols, ordered alkyne SAM structure has still chemical bonding between carbon and gold. Alkyne SAMs are good candidates for the ambient molecular electronics application. The last part of this dissertation presents the study of a monolayer of a Ru(II) complex which is prepared on gold substrate. With the help of STM and XPS methods, the ordered structure and binding properties of the CS28 molecules were characterized by providing a deeper insight into the carboxyl and sulfur groups binding affinity to gold substrate. CV and EIS methods were used to compare the adsorption properties and charge transfer process with the bare gold substrate and SAMs.Article Citation - WoS: 10Citation - Scopus: 12Li-Ion Battery Cathode Performance From the Electrospun Binary Licoo2 To Ternary Li2coti3o8(Springer Verlag, 2020) Kap, Özlem; İnan, Alper; Er, Mesut; Horzum, NesrinMetal oxide nanofibers are prepared by electrospinning and are developed to be the electrodes for lithium-ion batteries (LIBs). The effect of calcination temperature and the Li:Co mole ratio of LiCoO2 nanofibers was investigated on the electrochemical cathode performance in a coin cell battery. The higher temperature calcination and Li:Co mole ratio have improved the electrochemical performance of the nanofibers. Lithium cobalt oxide (LiCoO2) nanofibers obtained at 400 and 700 degrees C retain 65% and 90% of the initial capacity, respectively, after the high-current test and the C-rate reverted to 0.1 C. When doubling the mole ratio of Li:Co (2:1), an increase in specific capacity values from 78 to 148 mAh g(-1) has been provided. Additionally, colloidal titania nanoparticles (TiO2 NPs)-doped LiCoO2 nanofibers were obtained and investigated as a cathode material. While the increment in calcination temperature results in higher crystallinity and stability of the LiCoO2 phase, in the presence of the TiO2 NPs causes a transformation of binary (LiCoO2/TiO2) to ternary Li-based transition metal oxide (Li2CoTi3O8/TiO2). An initial discharge capacity of 82 mAh g(-1) was found at 0.1 C for the Li2CoTi3O8/TiO2 nanoparticles and the capacity retention was 83% when returned to 0.1 C after 25 cycles.