Özuğur Uysal, Bengü

Özuğur Uysal, Bengü

Name Variants

Özuğur Uysal, Bengü
B.,Özuğur Uysal
B. Özuğur Uysal
Bengü, Özuğur Uysal
Ozugur Uysal, Bengu
B.,Ozugur Uysal
B. Ozugur Uysal
Bengu, Ozugur Uysal
Uysal, Bengü Özuğur
Özuğur, B
Uysal, Bengü Özuğur
Uysal, Bengu Ozugur
Uysal, Bengü Özuğur

Job Title

Dr. Öğr. Üyesi

Email Address

Bozugur@khas.edu.tr

Main Affiliation

Molecular Biology and Genetics

Status

Former Staff

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Sustainable Development Goals Report Points

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Scholarly Output

28

Articles

21

Citation Count

0

Supervised Theses

5 Scholarly Output Search Results

Now showing 1 - 10 of 28

Citation - WoS: 2
Citation - Scopus: 1
Characterization of Mwcnt-Tio2 Qps and Tio2 Qds in Self-Assembled Films
(Elsevier, 2017) Akkaya Arier, Ümit Özlem; Özuğur Uysal, Bengü; Uysal, Bengü Özuğur; Molecular Biology and Genetics
In this study the solution which includes TiO2 quantum dots (QDs) was mixed with the multi-wall carbon nanotubes (MWCNTs) to prepare MWCNT-TiO2 QDs composite films. The effect of microstructures on the structural and optical properties of MWCNT-TiO2 QDs composite films was evaluated. The activation energy for crystallite growth of TiO2 QDs which are produced in brookite phases was calculated as 20.3 kJ/mol. The properties of MWCNT-TiO2 QDs composite films were characterized by X-ray diffraction (XRD) scanning electron microscopy (SEM) atomic force microscopy (AFM) and ultraviolet-visible absorption spectroscopy (UV-vis). (C) 2017 Elsevier GmbH. All rights reserved.
Citation - WoS: 9
Citation - Scopus: 9
The Ws(2)dependence on the Elasticity and Optical Band Gap Energies of Swollen Paam Composites
(Sage Publications, 2020) Evingür, Gülsen Akın; Özuğur Uysal, Bengü; Sağlam, Nafia Alara; Pekcan, Mehmet Önder; Çimen, Büşra; Uysal, Bengü Özuğur; Pekcan, Önder; Molecular Biology and Genetics
New generation nano-filler polymer composites have many applications including biomedical, electronic and maritime related applications because of their mechanical, electronic and optical properties. The properties of composites were investigated as a function of nano-filler content. Among these, tungsten disulfide (WS2) has the potential to be used as a component in electronic devices owing to its high electron mobility and easily tunable optical band gap energy. Tungsten disulfide (WS2)- Polyacrylamide (PAAm) composite was prepared using free radical co-polymerization and wet laboratory methods with WS(2)content. Composites were characterized for mechanical and optical properties using an Elasticity Instrument and UV-vis Spectrophotometer, respectively. Elastic modulus was modeled by a statistical thermodynamics model. Tauc's and Urbach's Tail model for direct transition were used to model for the optical band gap. In this study, the swelling and WS(2)effect on the optical band gap and elasticity of WS2- PAAm composites were investigated. It was observed that the elasticity presented a reversed behavior of optical band gap energies with respect to WS(2)content. For the applications of nano-filler doped polymer composites in flexible electronic devices, WS(2)content strongly influences the mechanical and optical properties.
Mos2'nin Tnbc Kanser İlaci Yükleme ve Salimina Yönelik Basit ve Yeni Peg K-carrajenan Hidrojel Üzerinde Etkisi
(2023) Hassan, Gana Sherıf; Özuğur Uysal, Bengü; Uysal, Bengü Özuğur; Molecular Biology and Genetics
İki boyutlu inorganik bir molekül olan molibden disülfür (MoS2), ayırt edici özellikleri nedeniyle son zamanlarda tıbbi araştırmalarda farmasötiklerin taşınması açısından incelenmiştir. Oluşturulacak biyobozunur bir polimer sistemi, MoS2 ilavesiyle kanser ilacı dağıtımında uygulanabilir. Bu yazıda MoS2 miktarının yeni jel karışımımızın özellikleri ve performansı üzerindeki etkisini araştırıyoruz. Üçlü negatif meme kanseri (TNBC) ilaç taşıyıcı sisteminde uyarana duyarlı polimerik hidrojel olarak taşıyıcı olarak kullanılma potansiyeline sahip olduğu düşünülen MoS2 katkılı polietilen glikol ile yeni bir jel karışımının hazırlanması amaçlandı. PEG)/k-karagenan kombinasyonunun ilk özelliklerinin verilmesi. Bu 2D malzeme, polimerik jelin normal MoS2 içermeyen yapısına kıyasla geçirgenlik, şişme ve elastikiyet performansını artırarak hidrojeli etkiledi. Polimer karışımı özellikleri esas olarak UV-VIS spektrofotometresi ve gravimetrik analiz kullanılarak test edildi. Bu jel karışımlarının çeşitli özellikleri beş farklı kütlede araştırıldı. 5 mg MoS2, yeni ve basit malzeme kombinasyonumuza MoS2 eklenmesinin hidrojel özelliklerinin iyileştirilmesiyle sonuçlandığını gösteren verilere göre esneklik açısından araştırılan en iyi örnekti. Araştırmanın sonuçları, kanser ilaçlarının kesin olarak hedeflenmiş ve düzenlenmiş dağıtımı için ilaç yükleme ve ilaç salma kinetiğine kadar genişletilebileceğini gösterdi. Yakın gelecekteki bu hedefe yönelik ön veriler oluşturmak amacıyla doksorubisin ilacının üretilen jele yüklenme ve salınma mekanizmaları incelendi. Anahtar Kelimeler – Molibden Disülfür, geçirgenlik, şişme, K-Karragenan, Polietilen Glikol
Biyomedikal Uygulamalara Yönelik 3d Baskılı Kitosan Esaslı Kompozitlerin Sentezi ve Karakterizasyonu
(2023) Alayoubı, Oubadah; Özuğur Uysal, Bengü; Uysal, Bengü Özuğur; Molecular Biology and Genetics
Bu çalışmanın amacı, biyomedikal uygulamalarda kullanılmak üzere mevcut üç boyutlu yapılara alternatif olabilecek poli (vinil alkol) (PVA), aljinik asit ve poli (laktik asit) (PLA) içerikli İki boyutlu (2D) tungsten disülfür (WS2) ile katkılandırılmış Kitosan biyouyumlu kompozitlerin oluşturulmasıdır. Kitosan, Chitin'in lineer bir polisakkarit ve deasetillenmiş türevidir. Kitosanın benzersiz yapısal ve kimyasal özellikleri, onu çok yönlü biyolojik özelliklerinden yararlanan çeşitli biyomedikal endüstrilerde yaygın olarak kullanılan bir bileşen haline getirmektedir. WS2, antimikrobiyal etkiye sahip ve nihai ürünün mekanik özelliklerini artıran biyouyumlu bir malzemedir. Üç tip kompozit üretilmiştir: PLA/Kitosan, Aljinik asit/Kitosan ve PVA/Kitosan. Kompozit karışımlara çeşitli WS2 miktarları (0,5 mg, 1,0 mg, 1,5 mg, 2,0 mg) eklenmiştir. Ölçülen geçirgenlik ve sıcaklık testlerinin sonuçları karşılaştırılarak WS2 konsantrasyonunun kompozitlerin optik geçirgenlik ve şişme çalışmalarına etkisi araştırıldı. Geçirgenlik deneyleri, jelleşme modellerini tespit etmek ve her bir kompozit tipinin jel haline gelmesi için gereken süreyi hesaplamak için UV-vis spektrofotometresi kullanılarak gerçekleştirildi. Sonuçlar, jelleşme işlemi sırasında kompozitlerin geçirgenlik yeteneğinin yanı sıra sıcaklığın da düştüğünü gösterdi. Ayrıca, WS2'nin eklenmesi polimer kompozitin elastikiyetini arttırdığı ve şişme özelliğini etkilediği gözlendi. Sonuç olarak CS/PVA/WS2, CS/Aljinik Asit/WS2 ve CS/PLA/WS2 kompozitleri üstün mekanik özelliklere ve biyouyumluluğa sahip olabilir ve bu da onları doku mühendisliği alanında oldukça uygulanabilir hale getirebilir.
Citation - WoS: 8
Citation - Scopus: 8
The Electrochromic Performances of Single Phase Vo2 Nanoparticled Films
(Elsevier Science SA, 2016) Akkaya Arier, Ümit Özlem; Özuğur Uysal, Bengü; Uysal, Bengü Özuğur; Molecular Biology and Genetics
In the present work pure phase vanadium oxide VO2 nanoparticled films were synthesized using acetate based sol-gel precursors. The effect of the water: Vanadyl acetylacetonate ratio on electrochemical and structural properties of nanostructured vanadium oxide films was examined. The X-ray diffraction studies indicated that very strong crystallization of the VO2 monoclinic phase occurred for the as-deposited films at the annealing temperature of 500 degrees C. According to the atomic force microscopy and scanning electron microscopy measurements the size and morphology of the granular structured film depend on the water: Vanadyl acetylacetonate ratio. I-V curve spectra were used to compute several characteristics of the films coated on indium tin oxide substrates such as the optical density color efficiency and diffusion coefficient. Even though water: Vanadyl acetylacetonate ratio of 0.1 is expected to give the highest color efficiency value (33 cm(2)/C) higher diffusion coefficient (3.15 x 10(-12) cm(2)/s) is observed in the ratio of 0.01. As a result the correlation between the ratios and electrochromic properties of the films was established. (C) 2016 Elsevier B.V. All rights reserved.
Citation - WoS: 3
Citation - Scopus: 4
Tungsten Disulfide (ws2) Doped Polyacrylamide (paam) Composites: Gelation and Optical Studies
(Elsevier Gmbh, 2021) Nayir, Sseyma; Özuğur Uysal, Bengü; Kivrak, Sena; Pekcan, Mehmet Önder; Kara, Iirem; Uysal, Bengu Ozugur; Pekcan, Oonder; Molecular Biology and Genetics
The organic Acrylamide (AAm) copolymerization in various contents of inorganic WS2 has been reported. The aim was to investigate the effect of the WS2 amount on the obtained morphology and the gelation process of the AAm composites. It was found that during gelation process the photon intensity of transmission decreased significantly above some critical time, called the gel point, tg. The decrease in the photon intensity of transmission was related to the increase in the intensity of scattered light from the gel attributable to the production of microgel that occurs while copolymerization held in AAm with Bis-Acrylamide (BIS). Gel points were found to be increased by increasing WS2 content. Time-dependent scattering of composites manifests the growth mechanism, the greater microgel particles, as in agreement with Rayleigh's equation of scattering. It is determined that concentration of microgels is inversely proportional to the WS2 content. The composite rate constants of gelation, kr were produced and observed that it is proportional to WS2 content. It is understood that inclusion of WS2 in AAm system during gelation delays the process at early times but then contributes to increase the gelation process by increasing the rate of polymerization. Besides less compact PAAm gels are produced in the presence of WS2 atoms. It is also shown that the microgel growth mechanism and gel point of PAAm composite incorporated with WS2 can be significantly tailored by the amount of WS2. Tunable growth mechanism and critical gelation point is crucial for flexible electronic applications.
Citation - WoS: 14
Citation - Scopus: 14
2d Materials (ws2, Mos2, Mose2) Enhanced Polyacrylamide Gels for Multifunctional Applications
(Mdpi, 2022) Uysal, Bengu Ozugur; Özuğur Uysal, Bengü; Nayir, Seyma; Acba, Melike; Citir, Betul; Durmaz, Sumeyye; Kocoglu, Sevval; Yildiz, Ekrem; Molecular Biology and Genetics
Multifunctional polymer composite gels have attracted attention because of their high thermal stability, conductivity, mechanical properties, and fast optical response. To enable the simultaneous incorporation of all these different functions into composite gels, the best doping material alternatives are two-dimensional (2D) materials, especially transition metal dichalcogenides (TMD), which have been used in so many applications recently, such as energy storage units, opto-electronic devices and catalysis. They have the capacity to regulate optical, electronic and mechanical properties of basic molecular hydrogels when incorporated into them. In this study, 2D materials (WS2, MoS2 and MoSe2)-doped polyacrylamide (PAAm) gels were prepared via the free radical crosslinking copolymerization technique at room temperature. The gelation process and amount of the gels were investigated depending on the optical properties and band gap energies. Band gap energies of composite gels containing different amounts of TMD were calculated and found to be in the range of 2.48-2.84 eV, which is the characteristic band gap energy range of promising semiconductors. Our results revealed that the microgel growth mechanism and gel point of PAAm composite incorporated with 2D materials can be significantly tailored by the amount of 2D materials. Furthermore, tunable band gap energies of these composite gels are crucial for many applications such as biosensors, cartilage repair, drug delivery, tissue regeneration, wound dressing. Therefore, our study will contribute to the understanding of the correlation between the optical and electronic properties of such composite gels and will help to increase the usage areas so as to obtain multifunctional composite gels.
Citation - WoS: 4
Citation - Scopus: 4
Effects of Precursor Parameters on the Optical and Electrical Properties of Azo Nano-Composite Films
(Elsevier GMBH Urban & Fischer Verlag, 2016) Akkaya Arier, Ümit Özlem; Özuğur Uysal, Bengü; Uysal, Bengü Özuğur; Molecular Biology and Genetics
Al doped ZnO (AZO) nano-composite films were synthesized on glass substrates with the sol gel spin coating method at the room temperature. The activation energy of AZO nano-composite films was calculated to be 49 kj/mol for the particles growth. The electrical structural and optical properties of AZO films were determined by changing ZnO:water and ZnO:Al ratios. ZnO:water and ZnO:Al ratios play an important role in controlling the electrical conductivity of the AZO nano-composite films. The optimum doping ratio of Al was found to be 2% in terms of the lowest resistivity and above 2% Al-doping concentration the surface resistivity of AZO nano-composite films starts to increase. The optical highest transmittance of the films of 86% in visible region and low surface resistivity of 70 Omega/square can be obtained for the optimum doping ratio of Al. (C) 2016 Elsevier GmbH. All rights reserved.
Citation - WoS: 0
Citation - Scopus: 0
Investigation of Structural and Antibacterial Properties of Ws₂-doped Zno Nanoparticles
(Amer Chemical Soc, 2024) Beytur, Sercan; Eşsiz, Şebnem; Essiz, Sebnem; Özuğur Uysal, Bengü; Uysal, Bengu Ozugur; Molecular Biology and Genetics
ZnO nanoparticles, well-known for their structural, optical, and antibacterial properties, are widely applied in diverse fields. The doping of different materials to ZnO, such as metals or metal oxides, is known to ameliorate its properties. Here, nanofilms composed of ZnO doped with WS2 at 5, 15, and 25% ratios are synthesized, and their properties are investigated. Supported by molecular docking analyses, the enhancement of the bactericidal properties after the addition of WS2 at different ratios is highlighted and supported by the inhibitory interaction of residues playing a crucial role in the bacterial survival through the targeting of proteins of interest.
Citation - WoS: 2
Citation - Scopus: 2
Cosmic Ray Intensity Variation During a Cme
(Pergamon-Elsevier Science Ltd, 2002) Kandemir, Gulcın; Özuğur Uysal, Bengü; Geçkinli, Melih; Fırat, Coşkun; Yılmaz, Melek; Özuğur, B; Molecular Biology and Genetics
The June 6 2000 coronal mass ejection was an exceptional full halo which made it possible to measure cosmic ray (CR) decrease with a simple experimental set-up. Variation in the local secondary cosmic ray density has been investigated by means of gamma rays. The experiment site was located in Istanbul (41.1N 29.0E). CR electrons and slow gamma rays have been eliminated. The CR density has dropped drastically starting on June 8 2000. The counts have been compared with the pre-shock levels and some other cases of CMEs. During strong solar modulation the local counts of secondary CR intensity values dropped down as much as 24%. (C) 2002 Elsevier Science Ltd. All rights reserved.