Sağlam, Özge

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https://hdl.handle.net/20.500.14365/6770
Name Variants
Saglam, OEzge
Saglam, Özge
Saglam, Ozge
Job Title
Email Address
ozge.saglam@ieu.edu.tr
Main Affiliation
05.10. Mechanical Engineering
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Current Staff
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ORCID ID
0000-0002-5583-3662
Scopus Author ID
55750645300
Turkish CoHE Profile ID
5709157AC71F80DD
Google Scholar ID
EsR3_uMAAAAJ
WoS Researcher ID
AAB-3878-2020
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Ozge_Saglam.jpg (9.73 KB)

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CLEAN WATER AND SANITATION6
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Documents

29

Citations

734

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12

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Documents

34

Citations

794

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Scholarly Output

20

Articles

15

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145/141

Supervised MSc Theses

3

Supervised PhD Theses

0

WoS Citation Count

169

Scopus Citation Count

127

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0

Projects

7

WoS Citations per Publication

8.45

Scopus Citations per Publication

6.35

Open Access Source

9

Supervised Theses

3

JournalCount
Colloıds And Surfaces A-Physıcochemıcal And Engıneerıng Aspects2
Chemıcal Communıcatıons1
ChemnNanoMat1
ChemPlusChem1
Colloids and Surfaces A: Physicochemical and Engineering Aspects1
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  • Thumbnail Image
    Article
    Citation - WoS: 10
    Citation - Scopus: 11
    Upconversion Properties of Tm3+-Er3+ Co-Doped Layered Perovskites and In-Vitro Cytotoxicity of Their Exfoliated Nanomaterials
    (Elsevier, 2021-03) Gunay, Bensu; Sariyar, Ece; Unal, Ugur; Karagonlar, Zeynep Firtina; Saglam, Ozge; Firtina Karagonlar, Zeynep
    The upconversion behavior of Er3+/Tm3+ co-doped Ruddlesden-Popper type K(2)Ln(2)Ti(3)O(10) layered perovskites was investigated. The lanthanide pair was selected for achieving 980 nm-driven green, red, and NIR emission. The perovskites having different dopant compositions were synthesized by a conventional solid-state procedure by substitution of La3+ ions in the host lattice. Moreover, the single nanosheets having approximately 1.8 nm thickness and 2 mu m lateral size were obtained via chemical exfoliation. The non-doped and co-doped layered materials and the nanosheets derived from these materials were characterized by X-ray diffraction, Scanning Electron Microscopy, Atomic Force Microscopy and custom-made experimental set-up of upconversion emission spectroscopy. According to the XRD profiles, the perovskites had the layered orientation and water molecules in the interlayer domain because of their hygroscopic nature. The co-doped layered perovskites presented twophoton excited green and red emissions, identified as S-4(3/2) -> (4)I(15/2 )with H-2(11/2) -> (4)I(15/2 )and F-4(9/2) -> I-4(15/2) of the Er3+ transitions with a NIR emission. The intensity of red to green ratio emission of the materials increased with respect to the co-dopant concentration. The nanosheets' upconversion emission was weak in the visible region compared to their layered morphology. On the other hand, the NIR emission based on H-3(4) -> H-3(6) transition of the Tm3+ ions was preserved despite the acid and solvent treatments to break apart the layered orientation. MTT assay and Calcein/PI staining were conducted to evaluate cytotoxicity of non-doped and Er3+/Tm3+ co-doped K(2)Ln(2)Ti(3)O(10) perovskites and their exfoliated nanosheets on HEK 293 and HepG2 cell lines. Both assays indicated that although cell viability decreases with increasing concentration, good cell viability was observed at even 100 mu g/mL. In addition to their excellent luminescent and optical features, the nanomaterials also demonstrated low cytotoxicity increasing the potential for their use in laser-based biological applications.
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    Master Thesis
    2d Perovskite Nanosheets for Multifunctional Device Fabrication and Biological Applications
    (İzmir Ekonomi Üniversitesi, 2021) Günay, Bensu; Sağlam, Özge; Karagonlar, Zeynep Fırtına
    Bu tezin amaçları, frekans yükseltme özelliğine sahip nanolevhalar kullanılarak yapılandırılmış çok işlevli bir cihaz tasarımı ve biyolojik uygulamalar için iki boyutlu nanolevhaların biyouyumluluğunun araştırılmasıdır. K2Ln2Ti3O10 yapıda katmanlı perovskitler frekans yükseltme ile kırmızı ışıma elde edebilmek için farklı sitokiyometrik oranlarda Tm3+/Er3+ iyonları ile katkılandırılarak sentezlenmiştir. 2.5% Tm3+-20% Er3+ ile katkılı katmanlı malzemenin yanal boyutu 300 nm ile 2.5 µm arasında elde edilmiştir. Nanolevhaların kalınlığı 2-3 nm arasında belirlenmiştir ve tek nanolevhaların başarılı bir şekilde elde edildiği gösterilmiştir. Frekans yükseltme özelliğine sahip Tm3+/Yb3+ ve Er3+/Yb3+ ile katkılı nanolevhalar katman-katman tekniği ile 20 kez kaplanmıştır ve hazırlanan filmler sırasıyla 1G4 ›3H6 geçişi ile mavi ışıma ve 4S3/2›4I15/2 ve 2H11/2›4I15/2 geçişleri ile yeşil ışımalar göstermiştir. Öte yandan, Tm3+/Er3+ ortak katkılı nanolevha yapılı filmler, frekans yükseltme işlemi sırasında kırmızı ve yeşil emisyon sergilemiştir. Er3+/Yb3+ ortak katkılı nanolevhaların biriktirilmiş filmleri durumunda, yeşil ve kırmızı frekans yükseltme emisyonlarında iki foton süreçleri yer almıştır. 60 katman ile üretilen filmler ayrıca üç farklı nanolevhalar kullanılarak hazırlanmıştır. Film oluştururken nanolevhaların kombinasyonu CIE diagramında beyaz emisyon sergilemiştir. Ayrıca nanolevhaların sitotoksisitesi HepG2 ve HEK 293 hücre hatları kullanılarak analiz edilmiştir. HEK 293 hücre hattı için Tm3+/Er3+ katkılı katmanlı malzemenin toksisitesi %45,7 iken, nanolevhaların toksisitesi %73,6 olarak belirlenmiştir.
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    Review
    Citation - WoS: 23
    Citation - Scopus: 24
    Fighting Bacterial Pathogens With Carbon Nanotubes: Focused Review of Recent Progress
    (Royal Soc Chemistry, 2023) Asaftei, Mihaela; Lucidi, Massimiliano; Cirtoaje, Cristina; Holban, Alina-Maria; Charitidis, Costas A. A.; Yang, Fang; Wu, Aiguo; Sağlam, Özge; Stanciu, Stefan G.
    The fast and global spread of bacterial resistance to currently available antibiotics results in a great and urgent need for alternative antibacterial agents and therapeutic strategies. Recent studies on the application of nanomaterials as antimicrobial agents have demonstrated their potential for the management of infectious diseases. Among the diverse palette of nanomaterials currently used in biomedical applications, carbon nanotubes (CNTs) have gained massive interest given their many valuable properties, such as high thermal and electrical conductivity, tensile strength, flexibility convenient aspect ratio, and low fabrication costs. All these features are augmented by facile conjugation with functional groups. CNTs are currently available in many configurations, with two main categories being single-walled and multi-walled CNTs, depending on the number of rolled-up single-layer carbon atoms sheets making up the nanostructure. Both classes have been identified over the past years as promising antibacterial agents but the current level of understanding of their efficiency still harbors many pending questions. This mini-review surveys recent progress on the topic of antibacterial effects of CNTs and examines the proposed mechanisms of action(s) of different CNT typologies, placing the main focus on past studies addressing the antibacterial activity on Staphylococcus aureus and Escherichia coli, two prototypical Gram-positive and Gram-negative pathogens, respectively.
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    Article
    Citation - WoS: 50
    Citation - Scopus: 54
    Synthesis of Pyrene-Fused Pyrazaacenes on Metal Surfaces: Toward One-Dimensional Conjugated Nanostructures
    (Amer Chemical Soc, 2015-12-14) Jiang, Li; Papageorgiou, Anthoula C.; Oh, Seung Cheol; Sağlam, Özge; Reichert, Joachim; Duncan, David A.; Zhang, Yi-Qi
    We investigated the synthesis of one-dimensional nanostructures via Schiff base (imine) formation on three close-packed coinage metal (Au, Ag, and Cu) surfaces under ultrahigh vacuum conditions. We demonstrate the feasibility of forming pyrene-fused pyrazaacene-based oligomers on the Ag(111) surface by thermal annealing of tetraketone and tetraamine molecules, which were designed to afford cyclocondensation products. Direct visualization by scanning tunneling microscopy of reactants, intermediates, and products with submolecular resolution and the analysis' of their statistical distribution in dependence of stoichiometry and annealing temperature together with the inspection of complementary X-ray photoelectron spectroscopy signatures provide unique insight in the reaction mechanism, its limitations, and the role of the supporting substrate. In contrast to the reaction on Ag(111), the reactants desorb from the Au(111) surface before reacting, whereas they decompose on the Cu(111) Surface during the relevant thermal treatment.
  • Thumbnail Image
    Master Thesis
    A New Technique for Nanolithography Using Electrohydrodynamic Method and Argon Ion Etching Process
    (İzmir Ekonomi Üniversitesi, 2021) Döğer, Hilal; Sağlam, Özge
    Mikro ve nano yapı gerektiren cihazlar için çeşitli litografi teknikleri kullanılmaktadır. Günümüzde kullanılan litografi yöntemlerinde çok aşamalı prosesler veya yüksek maliyet sorunlarıyla karşılaşılabilmektedir. Çeşitli polimerlerden elde edilebilen ve yüksek elastikiyete sahip olan nanofiberler, cihaz geliştirmede sıklıkla kullanılmaktadır. Elektroeğirme yöntemi, nanofiberlerin istenilen kompozisyon ve çapta üretilebilmesi ve yakın mesafede kontrol edilerek desenlenebilmeleri nedeniyle, araştırmacılar tarafından sıklıkla tercih edilmektedir. Bu tezin amacı, elektrohidrodinamik yöntem ile üretilen nanofiberler ve argon iyon aşındırma işlemini kullanarak yeni bir tür nanolitografi tekniği geliştirmektir. İlk aşamada nanofiberler, termal buharlaştırma ile krom, gümüş ve altın ile kaplanmış silikon ve cam alttaşlar üzerine desenlendi. Sonrasında desenlenmiş yapılara sırasıyla argon iyon aşındırma ve polimer kaldırma işlemleri uygulanarak metalik desenler üretildi. Metalik desenlerin elektriksel karakterizasyonu, iki nokta ölçüm yöntemiyle gerçekleştirildi. Desenlerin morfolojisi, kaldırma işleminden önce ve sonra Atomik Kuvvet Mikroskobu ile elde edildi. Yapıların element analizi, Taramalı Elektron Mikroskobu-EDX ile yapıldı. Sistem parametrelerinin optimize edilmesiyle, nanofiberler ile alttaşlar üzerinde birbirine bağlı interdigitated yapıları içeren çeşitli metalik desenler başarılı bir şekilde üretildi. Sonuç olarak, nanofiberler önceki çalışmalarda kullanılmak için üretilirken, bu tezde nanofiberler bir araç olarak kullanılarak yeni bir nanolitografi yöntemi geliştirildi.
  • Thumbnail Image
    Article
    Citation - WoS: 11
    Citation - Scopus: 11
    Isomerism Control of Diethylstilbestrol by Metal Surface Induced O-H Cleavage
    (Royal Soc Chemistry, 2018) Oh, Seung Cheol; Lloyd, Julian A.; Fischer, Sybille; Saglam, OEzge; Papageorgiou, Anthoula C.; Diller, Katharina; Duncan, David A.
    Diethylstilbestrol (DES) is studied on Ag(111) and Cu(111) surfaces using X-ray photoelectron spectroscopy (XPS) and scanning tunnelling microscopy (STM). We find that DES molecules on the silver surface adsorb intact and adopt a trans-conformation. On the more reactive copper surface, O-H bond cleavage results in molecular adsorption in the cis-conformation, thus providing the means of obtaining different adsorption geometries. The difference in isomerism is reflected in the observed self-assemblies which exhibit room-temperature stability.
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    Master Thesis
    2d Oxide Dielectric Nanosheets Structured Nanofilms for Ultrathin, Flexible, Transparent Capacitor Fabrication and Biological Applications
    (İzmir Ekonomi Üniversitesi, 2024) Küçükcan, Begümnur; Sağlam, Özge; Gördeşli̇ Duatepe, Fatma Pınar; Duatepe, Fatma Pınar Gördesli
    Bu tezde, Dion-Jacobson (DJ) tipi KCa2NaNb4O13 katmanlı malzemeler katı hal yöntemi kullanılarak sentezlenmiştir. KCa2NaNb4O13 katmanlı malzemelerinin kimyasal pullandırma yöntemi ile 2.4 nm kalınlığında ve 3.5 µm yanal boyutlarında Ca2NaNb4O13 nanolevhaları içeren kolloidal solüsyonlar elde edilmiştir. Bu kolloidal solüsyonlar arasında TBA+:H+ oranı 1:16 olan solüsyon nanolevha üretimi için kullanılmıştır. Bu nanolevhalar, Langmuir-Blodgett (LB) kaplama yöntemi kullanılarak indiyum kalay-oksit – polietilen tereftalat (ITO-PET), Si, Ti/Au-Si, Ti/Au-cam ve ITO-cam alttaşları üzerine kaplanmıştır. Ek olarak, 10, 15 ve 20 katmanlı nanofilmler ITO-PET alttaşları üzerine kaplanmış ve optik litografi tekniği kullanılarak desenlenmiştir. Bu desenler, 75 nm kalınlığında ITO ile kaplanarak, 250 x 250 µm2' den 75 x 75 µm2' ye kadar değişen boyutlarda şeffaf ve esnek kapasitörler üretilmiştir. 10, 15 ve 20 katmanlı nanofilmlerini içeren kapasitörlerde, dielektrik katman sayısındaki artış, kaçak akım değerlerini azalttığı gözlemlenmiştir. Ayrıca, Si, Ti/Au-Si, Ti/Au-cam ve ITO-cam alttaşları üzerindeki nanofilmler, elektron demet litografisi (EBL) ile desenlenmiş ve 15/20 nm kalınlığında Ti/Au ile kaplanmıştır. Ti/Au-Si, Ti/Au-cam ve ITO-cam alttaşlar üzerinde de 20 x 20 µm2' den 250 x 250 nm2' ye kadar değişen boyutlarda Ti/Au elektrotlar da üretilmiştir. C-AFM ölçümleri ile bu elektrotların I-V analizleri yapılmıştır. Öte yandan, Ca2NaNb4O13 nanolevhaları ile üretilmiş nanofilmlerin Si ve ITO-PET alttaşları üzerindeki polar ve apolar yüzey gerilimleri, adezyon çalışmaları, yüzey termodinamiği temelli matematiksel modelleme ile hesaplanmıştır. Böylece, nanofilm ile ITO-PET arasındaki artan polar bağlanma, suda daha güçlü bir adezyona sebep olduğu tespit edilmiştir. Hem kaplanmamış hem de nanofilm kaplanmış Si ve ITO-PET alttaşlar üzerindeki bakteriyel biyofilm oluşumu, kristal viyole (CV) boyama yöntemi ile analiz edilmiştir.
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    Article
    Citation - WoS: 12
    Tuning the Ease of Formation of On-Surface Metal-Adatom Coordination Polymers Featuring Diketones
    (Royal Soc Chemistry, 2018) Papageorgiou, Anthoula C.; Li, Jiang; Oh, Seung Cheol; Zhang, Bodong; Sağlam, Özge; Guo, Yuanyuan; Reichert, Joachim
    We use pyrene-4,5,9,10-tetraketone molecules with substituents of varying bulkiness in the 2,7 positions to probe the generality and versatility of the previously reported on-surface coordination of two diketones with a single metal atom, leading to one-dimensional coordination polymers. Three different low index surfaces of group 11 metals (Cu, Ag and Au) are used to provide both the support and the metal atoms for metal-organic coordination. By real space visualisation with single molecule resolution employing scanning tunnelling microscopy we investigate the molecular self-assembly and show how this can be substantiated with the formation of metal-organic linear and cyclic oligomers, depending on the employed substrate.
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    Article
    Citation - WoS: 16
    Dynamics of Spatially Confined Bisphenol a Trimers in a Unimolecular Network on Ag(111)
    (Amer Chemical Soc, 2016-02-05) Lloyd, Julian A.; Papageorgiou, Anthoula C.; Fischer, Sybille; Oh, Seung Cheol; Saglam, Ozge; Diller, Katharina; Duncan, David A.
    Bisphenol A (BPA) aggregates on Ag(111) shows a polymorphism between two supramolecular motifs leading to formation of distinct networks depending on thermal energy. With rising temperature a dimeric pairing scheme reversibly converts into a trimeric motif, which forms a hexagonal superstructure with complex dynamic characteristics. The trimeric arrangements notably organize spontaneously into a self-assembled one-component array with supramolecular BPA rotors embedded in a two-dimensional stator sublattice. By varying the temperature, the speed of the rotors can be controlled as monitored by direct visualization. A combination of scanning tunneling microscopy and dispersion corrected density-functional tight-binding (DFTB-vdW(surf)) based molecular modeling reveals the exact atomistic position of each molecule within the assembly as well as the driving force for the formation of the supramolecular rotors.
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    Article
    Citation - WoS: 21
    In Vacuo Porphyrin Metalation on Ag(111) Via Chemical Vapor Deposition of Ru-3(co)(12): Mechanistic Insights
    (Amer Chemical Soc, 2016-04-18) Papageorgiou, Anthoula C.; Diller, Katharina; Fischer, Sybille; Allegretti, Francesco; Klappenberger, Florian; Oh, Seung Cheol; Saglam, Ozge
    Porphyrin molecules offer a very stable molecular environment for the incorporation of numerous metal ions inside their cavity, which enables a plethora of applications. The fabrication and characterization of surface confined metal organic architectures by employing porphyrins are of particular interest. Here, we report on a comprehensive study of chemical vapor deposition (CVD) of triruthenium dodecacarbonyl as metal precursor for the on-surface metalation of different porphyrin species with Ru under ultrahigh vacuum conditions. By employing synchrotron radiation X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption fine structure (NEXAFS), and scanning tunneling microscopy (STM), we investigated the metalation process and particularly the role of the support: the close packed Ag(111) surface. It was found that the surface is active in the metalation process under the employed conditions: it decomposes the metal precursor and delivers metal centers to the porphyrin macrocycles. The generality of the metalation process is illustrated for tetraphenylporphyrin, its high temperature derivatives, and porphine.