Sürdürülebilir Kalkınma Amaçları

• 2
• 1

Yazarlar

• Bülbül, Ferhat(2)
• Bozkurt, Yusuf Burak(1)
• Demirci, Fatih(1)
• Dundar, Serkan(1)
• Ekmekci, Dursun(1)
• Emine Sukuroglu, Ebru(1)
• Ezgi, Yusuf(1)
• Faheemuddin, Muhammad(1)
• Khurshid, Zohaib(1)
• Kong, Fanbin(1)
• Ozturk, Samet(1)
• Singh, Rakesh K.(1)
• Taşdemir, Muharrem(1)
• Tekin, Bahar(1)
• Tekin, Samet(1)
• Zhang, Jin(1)
• Çelik, Ayhan(1)
• Çelik, Ilhan(1)
• Şenaslan, Fatih(1)

• MakaleAçık Erişim2024Scopus SJRQ2/r/gumushane/12000
  Effect of micro-arc oxidation coatings with graphene oxide and graphite on osseointegration of titanium implants-an in vivo study

  Tekin, Bahar; Dundar, Serkan; Tekin, Samet; Emine Sukuroglu, Ebru; Khurshid, Zohaib; Ezgi, Yusuf; Demirci, Fatih; Faheemuddin, Muhammad

  Background: This in vivo study evaluated the effect of graphene oxide and graphite coatings, coupled with the micro-arc oxidation (MAO) surface roughening technique, known for their mechanical strength, chemical stability, and antibacterial properties. The main objective was to assess the degree of improvement in osseointegration of titanium implants resulting from these interventions. Materials and methods: In this study, 32 female rats were utilized and randomly allocated into four groups (n = 8 each): machined surface titanium implants (control), those roughened by the MAO method, those coated with graphene oxide-doped MAO, and those with a graphite-doped MAO coating. Titanium implants were surgically placed in the right tibia of the rats. Rats undergoing no additional procedures during the 4-week experimental period were sacrificed at the end. Then, the implants and surrounding bone tissues were separated and embedded in acrylic blocks for reverse torque analysis. Using a digital torque device, the rotational force was applied to all samples using a hex driver and racquet until implant separation from the bone occurred, with the corresponding values recorded on the digital display. Then, statistical analysis was performed to analyze the data. Results: No statistically significant difference between the groups was observed in the biomechanical bone–implant connection levels (N/cm) (P = 0.268). Post-hoc tests were not required because no discernible differences were identified between the groups. Conclusion: Within the scope of this study, implants treated with the MAO method, along with those coated with graphene oxide- and graphite-doped MAO method, did not exhibit significant superiority in terms of osseointegration compared to machined surface titanium implants.

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  AtıfScopus9·WoS8·OpenAlex10

  İncele
• MakaleYalnız künye2023Scopus SJRQ1/r/gumushane/12756
  Enhanced wear resistance and surface properties of oxide film coating on biocompatible Ti45Nb alloy by anodization method

  Şenaslan, Fatih; Taşdemir, Muharrem; Çelik, Ayhan; Bozkurt, Yusuf Burak

  β-Titanium alloys have become increasingly popular as biomaterials because of their low modulus of elasticity and superior corrosion properties in recent years. β-titanium alloy containing niobium is also a biocompatible and non-toxic material. Among β-Ti alloys, Ti45Nb is one of the most remarkable alloys for its superior properties as a biomaterial. This alloy has superior properties due to low elasticity modulus and non-toxic elements, but its surface properties are inadequate for biomaterial applications. Therefore, various surface treatments are applied to improve the surface properties of these alloys. In this study, an oxide film layer was formed on the Ti45Nb surface under different potential conditions by the anodizing method. The effects of these factors on friction, wear, and contact angle measurements were investigated. The structural properties of the oxide film coated samples were analyzed with XRD and their surfaces and cross-sectional images were observed by SEM. Also, the surface roughness and nanoindentation tests were performed. In this regard, it was determined that oxide film thickness, surface roughness and hardness increased with the increase of anodization potential. The contact angle of the samples decreased with the increase in the anodization potential and the surface tension of the materials increased. The highest nanohardness of about 4.19 GPa was obtained from 150 TA samples. The elasticity modulus of the untreated sample was about 63 GPa, while the anodized samples ranged from an average of 31 to 83 GPa. The wear results revealed that the anodization process improved the wear resistance of the Ti45Nb alloy. As a result, the sample anodized at 200 V for 30 min exhibited optimum surface roughness, morphology and high wear resistance.

  AtıfScopus33·WoS32·OpenAlex32

  İncele
• MakaleAçık Erişim2020Scopus SJRQ1/r/gumushane/14799
  Effect of cellulose nanofiber-based coating with chitosan and trans-cinnamaldehyde on the microbiological safety and quality of cantaloupe rind and fresh-cut pulp. Part 1: Microbial safety

  Zhang, Jin; Ozturk, Samet; Singh, Rakesh K.; Kong, Fanbin

  This study aimed to evaluate the effect of cellulose nanofiber (CNF)-based coating containing chitosan (CHI) and trans-cinnamaldehyde (TC) on microbial growth of foodborne pathogens and spoilage microorganisms on cantaloupe rind and fresh-cut pulp. Coated/uncoated cantaloupe rind and pulp samples were inoculated with Salmonella enterica, Escherichia coli O157:H7 and Listeria monocytogenes and subsequently subjected to storage for 20 d at 4 °C or 12 d at 22 °C. Results showed that coating with only CNF (0.5%, dry-base) was effective in the elimination of S. enterica and E. coli O157:H7. Adding CHI (1%, w/w) and TC (1%, w/w) into CNF-based coating enhanced film formation on the surface and increased the antimicrobial activity on rind sample, but the reduction effect was less significant on pulp samples. The CNF (0.5%, dry-base) +CHI (1%, w/w) +TC (1%, w/w) coating resulted in 2.23, 2.43 and 3.22 log10 CFU/cm3 reduction of S. enterica, E. coli O157:H7 and L. monocytogenes, respectively, on pulp samples after 20 d at 4 °C. The formulation also significantly inhibited the growth of natural spoilage microorganisms, and no growth was observed up to 18 d at 4 °C. Results indicated that CNF-based coating significantly improved microbial safety of cantaloupe rind and fresh-cut pulp during storage by forming a physical barrier reducing activities of oxygen-dependent microorganisms.

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  AtıfScopus13·WoS9·OpenAlex10

  İncele
• MakaleAçık Erişim2015Scopus SJRQ2/r/gumushane/12073
  Preparation and characterization of electroless Ni-B/nano-SiO2, Al2O3, TiO2 and CuO composite coatings

  Ekmekci, Dursun; Bülbül, Ferhat

  Ni-B/SiO2, Al2O3, TiO2 and CuO composite coatings were successfully obtained by the electroless plating technique. Dispersible SiO2, Al2O3, TiO2 and CuO nanoparticles were co-deposited with electroless Ni-B coating onto AISI-304 steel substrates. Deposits were characterized for its structural properties by X-ray diffraction (XRD). XRD results showed a broad peak of Ni-B and low intensity composite nanoparticle peaks. The surface and cross-section morphology of samples were analysed using a scanning electron microscope (SEM). Surface analysis showed that the incorporation in Ni-B matrix of nano-SiO2, Al2O3, TiO2 and CuO particles increases the nodularity of composite coatings. The deposits are composed of a columnar structure grown along the vertical direction of the substrate surface. The results also show that electroless nanocomposite coatings tend to have greater microhardness compared with the coating without nanoparticles. The increase in the microhardness of the nanocomposite coatings reported in this study is attributed to an effect of dispersion strengthening of ceramic particles in the Ni-B matrix.

  AtıfScopus51·WoS46·OpenAlex59

  İncele
• MakaleYalnız künye2014Scopus SJRQ2/r/gumushane/15914
  EFFECT OF HEAT TREATMENT ON STRUCTURE OF ELECTROLESS Ni-B COATED PURE TITANIUM

  Bülbül, Ferhat; Çelik, Ilhan

  Pure titanium has a very large potential for use industrially due to its low weight, however, its usage continues to be limited because it possesses some disadvantages such as low hardness and wear resistance, weak corrosion resistance in high temperatures and high cost. In order to strengthen these weaknesses of pure titanium, electroless Ni-B deposition process, may be an alternative solution. In this study, the Ni-B coatings were deposited on pure titanium and annealed at the temperatures of 450 degrees C, 650 degrees C and 850 degrees C. The non-heat treated and heat treated coatings were structurally characterized via SEM (scanning electron microscope) and XRD (x ray diffraction). These coatings transformed from amorphous structure to a pronounced crystalline structure depending on heat treatment.

  AtıfWoS9·TR Dizin2

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