Sürdürülebilir Kalkınma Amaçları
Yazarlar
Yayınlar
- MakaleAçık Erişim2025Scopus SJRQ1Green Synthesis of Multi-Walled Carbon Nanotube-Reinforced Hydroxyapatite Doped with Silver and Silver-Core Selenium-Shell Nanoparticles: Synthesis, Characterization, and Biological Activity
Unal, İlkay
Hydroxyapatite (HAp) is widely used in biomedical applications due to its biocompatibility, osteoconductivity, and bioactivity. However, its low mechanical strength, tendency toward rapid corrosion, and lack of bactericidal properties present significant limitations in applications. This study aimed to improve the properties of HAp by reinforcing it with multi-walled carbon nanotubes (MWCNTs) and doping it with silver nanoparticles (AgNPs) and silver-core selenium-shell nanoparticles (Ag@SeNPs). Ocimum basilicum extract was used as both a reducing and stabilizing agent in the synthesis of nanoparticles using an environmentally friendly and non-toxic method as an alternative to traditional methods. The synthesized HAp, HAp/MWCNT, Ag-HAp/MWCNT, and Ag@Se-HAp/MWCNT nanocomposites were characterized by TEM, SEM, XRD, Raman spectroscopy, and BET analysis. BET analysis showed a reduction in surface area from 109.4 m2/g for pure HAp to 71.4 m2/g, 47.5 m2/g, and 35.3 m2/g for HAp/MWCNTs, Ag- HAp/MWCNTs, and Ag@Se-HAp/MWCNTs, respectively. Antimicrobial activities against P. aeruginosa, E. coli, S. aureus, E. faecalis, and C. albicans were evaluated. HAp and HAp/MWCNT did not show any antimicrobial activity, while Ag-HAp/MWCNTs showed inhibition zones of 14 mm for Escherichia coli and 18 mm for Pseudomonas aeruginosa at 5 mg/mL. Ag@Se-MWCNTs/HAp exhibited superior efficacy with inhibition zones of 18 mm, 12 mm, and 20 mm for S. aureus, E. faecalis, and Candida albicans, respectively. The incorporation of Ag@SeNPs enhanced HAp’s antibacterial and antifungal properties through a synergistic mechanism.
AtıfScopus12WoS10OpenAlex12
İncele - Yüksek Lisans TeziAçık Erişim2022Hibrit biyonanokompozit malzemelerin sentezlenmesi ve sulu çözeltilerden neodimyum gideriminde kullanımının modellenmesi
Hakan Andiçi
Bu tez çalışmasında aljinat ve kitosan kaplı manyetik demir oksit (Fe3O4) nanopartiküllerin (aljinat-Fe3O4, kitosan-Fe3O4), biyosentez tekniği ile sentezlendi. Sentezlenen aljinat- Fe3O4 ve kitosan-Fe3O4 hibrit biyonanokompozitlere sabit bir kolon içerisinde Nd3+'nın adsorpsiyonu ve desorpsiyonu yanıt yüzey metodolojisi (YYM) ile kombine edilmiş bir merkezi kompozit tasarım yaklaşımı (MKT) kullanılarak ve kontrollü desorpsiyonu incelendi. Aljinat-Fe3O4 ve kitosan-Fe3O4 nanokompozitlerin karakterizasyonu UV-GB, FT-IR, TGA-DTA, XRD ve SEM-EDS kullanılarak gerçekleştirildi. Sentezlenen ve karakterize edilen söz konusu biyokompozite malzemelere, Nd3+ iyonlarının adsorpsiyonu, çözelti pH'ı, çözeltinin kolondan akış hızı ve başlangıç Nd3+ iyonları konsantrasyonunun bir fonksiyonu olarak incelendi. Nd3+'nın hem aljinat-Fe3O4 hem de kitosan-Fe3O4 hibrit biyo-nanokompozit üzerine adsorpsiyonu sabit yataklı bir kolon sistemi kullanılarak optimum koşullar pH 5.4, çözeltinin kolondan akış hızı 4.0 mL dk-1 ve Nd3+ iyonları başlangıç konsantrasyonunun 120 mg L-1 olarak belirlendi. Aljinat-Fe3O4 ve kitosan-Fe3O4 biyo-nanokompozitlerin maksimum adsorpsiyon kapasitesi ve verimliliği sırasıyla 125.01 mg g-1, %99.8; 99.99 mg g-1, % 99.8 olarak hesaplandı. Deneysel parametrelerin optimizasyonu MKT yaklaşımı ile gerçekleştirildi ve önerilen kuadratik modelden hem aljinat-Fe3O4 hem de kitosan-Fe3O4 Nd3+ iyonlarının adsorpsiyonu için birer matematiksel model elde edilerek sunuldu. Varyans analizi sonuçları sentezlenen her iki kompozit malzemenin Nd3+ iyonlarının gideriminde kullanılmasındaki belirleme katsayılarının yüksek olduğunu gösterdi.
- MakaleAçık Erişim2022Scopus SJRQ2Synergistic effect of boron nitride and graphene nanosheets on behavioural attitudes of polyester matrix: Synthesis, experimental and Monte Carlo simulation studies
Başgöz, Öyküm; Güler, Seval Hale; Güler, Ömer; Canbay, Canan A.; Zakaly, Hesham M.H.; Issa, Shams A.M.; ALMisned, Ghada; Tekin, H.O.
We report the synergistic effects of boron nitride and graphene nanosheets on physical, structural, and nuclear radiation attenuation properties of polyester matrix-incorporated nanocomposites. Some critical material properties are thoroughly evaluated for several types of synthesized samples. Polyester is employed to strengthen graphene and boron nitride nanolayers, and their characteristics are investigated in detail. Additionally, we report the gamma-ray and fast neutron attenuation characteristics of synthesized nanocomposites to get a better understanding of the reinforcing effect as a function of material type and weight percentage. Thermal analysis findings indicate that adding graphene lowers the decomposition temperature but co-adding graphene and BNNS enhances thermal decomposition in comparison to graphene itself. Tensile tests showed that the inclusion of both GRP and GRP/BNNS strengthens the material. Among the polyester composite samples analyzed, the G3 sample with the most GNP reinforcement had the lowest HVL values throughout the broadest range of energy levels investigated. The recent findings may be beneficial to the scientific community in terms of incorporating these reinforcing types and ratios into polyester materials for a variety of applications, including industrial and research purposes.
AtıfScopus22OpenAlex19İncele - MakaleAçık Erişim2022Scopus SJRQ1Synthesis and structural, electrical, optical, and gamma-ray attenuation properties of ZnO-multi-walled carbon nanotubes (MWCNT) composite separately incorporated with CdO, TiO2, and Fe2O3
Basgoz, Oykum; Guler, Omer; Evin, Ertan; Yavuz, Cagdas; ALMisned, Ghada; Issa, Shams A.M.; Zakaly, Hesham M.H.; Tekin, H.O.
In this study, Fe2O3, TiO2, and CdO semiconductor metal oxides were separately incorporated into the ZnO-MWCNT composite at different weight percentages. Accordingly, several experimental analyses on electrical, optical, and radiation shielding characteristics of coupled semiconductor metal oxides nanocomposites were performed to determine their monotonic impact on the investigated material properties. Moreover, gamma-ray shielding properties of these novel materials were determined using MCNPX general-purpose Monte Carlo code. At 5% oxide addition, the maximum electrical conductivity was found in all groups for all temperatures. Moreover, 5% oxide reinforcement resulted in the maximum reflection characteristics in all groups. Among the CdO doped materials, the CZnOCd5 sample exhibits the highest electrical conductivity behaviour at room and high temperatures. The Eg value calculated for the CZnOCd5 sample was 3.284 eV. The CZnOCd2.5 and CZnOCd5 samples had the greatest Eg values when compared to the pure sample and the samples from other groups. The CZnOCd5 sample has the highest reflectance value in the CZnOCd group's reflectance graph. On the other hand, the maximum gamma-ray attenuation properties were reported for CZnOCd5 sample. Among the analysed samples, the CZnOCd5 sample's characteristics provide a preliminary motivation for a more comprehensive analysis of this material and assessment of potential radiation protection applications.
AtıfScopus29OpenAlex28İncele