Sürdürülebilir Kalkınma Amaçları

• 4

• MakaleAçık Erişim2025Scopus SJRQ2/r/munzur/1000
  Effects of ZrN and DLC coatings on morphostructural, corrosion, cell viability, and antibacterial properties of Ti6Al4V scaffolds

  Aslan, Naim; Aksakal, Bünyamin; Cihangir, Salih; Fidan, Ferzan; Yilmazer, Yasemin

  Lightweight and functional metallic materials are consistently favored and attract significant attention in the biomedical field. This study investigates the influence of ZrN and DLC coatings on Ti6Al4V scaffolds with varying porosities (40%, 50%, 60%) for biomedical applications. PVD-deposited coatings exhibited distinct growth mechanisms: High-resolution SEM-FIB analyses revealed columnar ZrN structures due to limited adatom mobility, while DLC formed conformal, amorphous layers via high-energy carbon species. Corrosion resistance decreased in 40% porous DLC and 60% porous ZrN-coated samples, likely due to coating defects and increased electrolyte access through open pores. ZrN coatings showed superior antibacterial activity and attributed to surface reactivity and potential ion release. In contrast, the uncoated 60% porous scaffolds demonstrated highest cell viability, suggesting that excessive coating on highly porous structures may hinder cell–material interactions. Furthermore, the cytotoxicity evaluations indicated that uncoated scaffolds exhibited the highest cell viability (77.51%) at 60% porosity after 48 hours, with ZrN coatings demonstrating better efficacy compared to DLC in the 50% and 60% porosity groups.

  • 
  AtıfScopus3·WoS3·OpenAlex3

  İncele
• MakaleAçık Erişim2024/r/munzur/5695
  Effects of Porosity and Boron Reinforcement in AISI 316L Stainless Steel for Biomedical Applications

  Aslan, Naim; Aksakal, Bunyamin; Fidan, Ferzan

  AISI 316L stainless steel (SS) is one of the most widely used biomaterials in the manufacture of implants and biomaterials. It has advantages over equivalent biomaterials such as low cost, good mechanical properties and biocompatibility. The pores found in porous biomaterials provide mechanical interlock, ensuring strong attachment of the implant to the tissue. In this study, 20%, 30% and 40% by volume of polyvinyl alcohol (PVA) and Boron powder were added into 316L powder to obtain porous SS implant. To investigate the effect of porosity and boron effect on the stainless-steel implant material, the samples produced in PVA and Boron added groups, were sintered at 1180 oC under an argon atmosphere. With the evaporation of PVA in the structure, porous and boron added samples were obtained in two groups. Finally, the samples were subjected to Brinell hardness and compression tests and analyzed by SEM, EDS and XRD. As a result of the hardness tests, the highest values were measured as 37.006, 31.32, 25.28 HB. 39.5, 34.5, 26.2 MPa strengths were measured for 20%, 30% and 40% porous samples respectively.

  • 
  AtıfOpenAlex1

  İncele
• MakaleAçık Erişim2024Scopus SJRQ2/r/munzur/1830
  The influence of cold rolling and hydroxyapatite coating on the mechanostructure, corrosion resistance, cell viability, and antibacterial activity of ZnCu biodegradable implants

  Aksakal, B.; Karadogan, S.A.; Aslan, N.; Fidan, F.; Yilmazer, Y.; Sezek, S.

  Zinc (Zn) and its alloys exhibit great potential for utilization in biodegradable bone implants. Zn-1Cu biodegradable alloy was produced and were cold rolled at two different deformation rates of 47 and 61%. The samples have been bioceramic coated with the sol–gel method and microstructure-mechanical property changes, corrosion behavior and biocompatibility of the samples were investigated. They were characterized by Optical, SEM, XRD and wettability analysis. The rolled samples showed a significant increase in hardness when compared to the non-rolled samples. The unrolled and 47% rolled samples showed better corrosion resistance compared to 61% rolled samples. Antibacterial effects of the base and sol–gel-coated groups showed higher cell viability ratios than the uncoated groups. Cell viability increased significantly in 47% of the rolled samples after 24, 48, and 72 h, however decreased by up to 70% in 61% of the rolled samples. Graphical abstract: (Figure presented.).

  • 
  AtıfScopus2·WoS2·OpenAlex2

  İncele
• MakaleAçık Erişim2023Scopus SJRQ3/r/munzur/2151
  Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications

  Fidan, Ferzan; Aslan, Naim; Koç, Mümin Mehmet

  Hydroxyapatite (HA) is a unique material that has the potential to be used to replace bones and teeth in the field of orthopedics and dentistry since HA exhibits quite similar biological and chemical characteristics to human bone. Hydroxyapatite ceramics are bioactive materials used to repair damaged human tissue. The pores in the porous hydroxyapatite ceramics provide a mechanical interlock, enabling a solid bond and fixation between the implant and bone. In this study, 0.5wt%, 1wt%, and 1.5wt% graphene oxide (GO) reinforced porous HA structures were obtained using the space-holder method to increase the strength of hydroxyapatite with low mechanical strength. NaCl was used as a spacer, and PEG 400 as a binder. Scaffold structures with 40% porosity rates were sintered at 1000 °C under vacuum. Finally, a compression test was applied to the samples which were previously analyzed by SEM, EDS and XRD. The compressive strengths of 0.5%, 1%, and 1.5% graphene oxide reinforced porous HA samples were determined between 8.04 and 31.14 MPa. The highest compressive strength was recorded as 31.14 MPa in the 1% GO added sample, and the lowest compressive strength was recorded as 8.04 MPa in the 1.5% GO added sample. In addition, it was understood that the mechanical properties did not increase regularly with the increase of graphene oxide reinforcing.

  • 
  AtıfScopus4·OpenAlex3

  İncele
• Yüksek Lisans TeziAçık Erişim2020/r/munzur/7111
  Dikdörtgen-çentikli plaka ile bir silindir üzerindeki direnci düşürme

  Ferzan Fidan

  Literatürde önceki araştırmacılar tarafından küt cisim direncini düşürmek için birçok akışa ters yönde konumlanmış küçük parçalar önerilmiş olmasına rağmen, bu araştırmaların hiçbirinde bir akışa ters yöndeki parça ve bir küt cisimden oluşan sistemin direncini düşürmek için üç-boyutlu bir parça kullanılmamıştır. Bu çalışmada, çeşitli dikdörtgen-çentikli plakalı sistemlerin aerodinamik performansı deneysel olarak test edilmiştir. Deneyler kapalı-çevrim rüzgar tünelinde gerçekleştirilmiştir. Tüm zaman-ortalamalı direnç, , ölçümlerinde, silindir çapına (D) bağlı Reynolds sayısı (Re) 12000 civarıdır. Bir dairesel silindir ve onun önündeki çentikli plakalardan meydana gelen sistemlerin (P01, P02, P03 ve P04 durumları) sonuçları, tek silindirinki (TS durumu) ve bir dairesel silindir ve onun önündeki düz plakadan meydana gelen sisteminki (P00 durumu) ile kıyaslanmıştır. Ön kısımdaki plakanın tipine bakılmaksızın, sistemlerin 'leri TS'ninkinden daha düşüktür. İki cisim arasındaki çok düşük boyutsuz mesafelerde, 0 düşürme bakımından en iyi performansı P00 durumu göstermiştir. g/D>0,25 için, P04 durumunun performansı P00'ınkine çok benzemektedir. Bununla birlikte, olası en düşük g/D'de 'yi minimuma düşürmede, P03'ün etkinliği en yüksek durum olduğu tespit edilmiştir. g/D=0,75 olduğu durumda, P03 sisteminin 'si, TS'ninkinden ve P00 sistemininkinden, sırasıyla, %37 ve %11 daha düşüktür.

  İncele