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• MakaleYalnız künye2026Scopus SJRQ2/r/gumushane/13777
  Synthesis, characterization, and thermal-magnetic evaluation of novel triazine-derived polyamides and their metal complexes

  Çanakçı, Dilek; Sarıbıyık, Oğuz Yunus

  In this work, novel triazine-containing polyamide derivatives possessing thermal stability and magnetic properties were synthesized. The synthesis process involves two steps: first, the chlorination of adipic acid and succinic acid using thionyl chloride; and second, the amidation of triazine. As a result of these procedures, two different triazine-containing polyamides were synthesized. The synthesized polyamides formed complexes with Ag, Cu, and Zn ions to enhance their thermal stability and magnetic properties.The structures of the synthesized polyamides were elucidated primarily by FTIR analysis, focusing on distinctive bands corresponding to the carbonyl group. The molecular structures of the polyamides were confirmed using 1H NMR and 13C NMR spectroscopy. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX) was employed to obtain information on the morphology and elemental composition of the samples. In addition, X-ray diffraction (XRD) analysis was performed to characterize the crystal structures, unit cell parameters, and orientations of the solid-state metal complexes. The thermal stability of both the polyamides and their metal complexes was investigated using thermogravimetric analysis (TGA). The magnetization of the synthesized compounds was measured as a function of temperature under zero-field-cooled (ZFC) and field-cooled (FC) conditions using a physical property measurement system (PPMS).

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• MakaleAçık Erişim2025Scopus SJRQ1/r/gumushane/12531
  Influence of Silver Doping and Anodization Current Density on Aluminum Surface Properties and Surface Adhesion of Staphylococcus aureus and Escherichia coli

  Erbakan, Mustafa; Taşdemir, Muharrem; Şenaslan, Fatih; Sarıbıyık, Oğuz Yunus

  In this study, we investigated the influence of crystal structure, topography, and elemental composition of aluminum oxide surfaces on bacterial adhesion. The structural properties of the surfaces were systematically controlled by varying the current density (1.5, 2.0, and 2.5 A/dm2) and silver doping during the anodization process. The resulting changes in structural and morphological properties were examined by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), contact angle measurements, and profilometry. Using FE-SEM analysis, we evaluated the adhesion of model bacteria, Escherichia coli and Staphylococcus aureus, to surfaces exhibiting diverse morphologies and elemental compositions. The surface roughness and crystal size of the aluminum oxide increased proportionally with the applied current density and silver doping. According to the XRD results, the slip plane crystal structure of (311) increased proportionally to the current density but decreased with silver doping. Specifically, while stepped atomic alignment of (311) planes facilitates bacterial attachment, smoother (200) planes reduce the adhered bacteria population. Further analysis via XPS revealed that the oxide crystal structure of undoped surfaces shifted from the tetrahedral to octahedral form with increasing current density, while silver-doped surfaces exhibited the opposite trend. Additionally, increasing current density during the preparation of silver-doped surfaces diminished the ratio of ionic silver to metallic silver, suggesting a lowered propensity for bacterial adhesion. S. aureus adhesion to undoped surfaces increased 4.46-fold for surfaces prepared at 2.5 A/dm2 compared to that at 1.5 A/dm2. Moreover, E. coli adhesion was completely inhibited on silver-doped surfaces anodized at 1.5 A/dm2. Reducing the surface roughness and incorporating silver during the anodization of aluminum surfaces decrease the number of bacteria adhering to aluminum oxide surfaces.

  İncele
• MakaleYalnız künye2024Scopus SJRQ2/r/gumushane/12496
  Selective Hydrogenation of Croton Aldehyde on Pt Nanoparticles Controlled by Tailoring Fraction of Well-Ordered Facets Under Different Pretreatment Conditions

  Sarıbıyık, Oğuz Y.; Resasco, Daniel E.

  This study focuses on the influence of pretreatment conditions and surface structures of well-tuned Pt nanoparticles on the selective hydrogenation of α-β unsaturated crotonaldehyde. The surface binding site preferences of the reactant during catalytic conversions are strongly influenced by the configuration of the nanoparticles’ surface fraction exposed. Since the orientation of the well-ordered surfaces are significantly affected by the pretreatment conditions, we have attempted to obtain relationships between morphology changes and catalytic activity by controlling the fraction of facets with ordered structures. Pt nanoparticles exhibit different types of exposed surfaces, namely Cubic (Cub) (100) and Cuboctahedra (CubOc) (111) + (100). These different surface structures play a crucial role in the preferential hydrogenation of the model molecule. Additionally, we investigated the impact of the pretreatment condition on the catalytic selectivity of the well-shaped nanoparticles. We employed various techniques such as high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), transmission electron microscopy (TEM), and room temperature carbon monoxide adsorption Fourier transform infrared spectroscopy (RT-CO-FTIR) to determine the reconstructions of the particles under different pretreatment conditions. The results indicate that both the well-ordered surface fraction and pretreatment conditions of Pt nanoparticles had a moderate influence on both catalytic activity and selectivity. Overall, this study highlights the importance of analyzing the surface morphology and pretreatment conditions of nanoparticles in order to optimize catalytic activity and selectivity in reactions involving well-tuned surface structures. Graphical Abstract: (Figure presented.).

  AtıfScopus4·WoS5·OpenAlex5

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• MakaleAçık Erişim2023Scopus SJRQ2/r/gumushane/12635
  The effect of the surface morphology of the aluminium oxide layer on the physical and bacterial attachment behavior

  Kaya, Şevval; Sarıbıyık, Oğuz Yunus

  Coating of the metal surface for different fields such as corrosion resistance, hydrophobic surface, and conductivity properties enhance the material quality for different application. Furthermore, controlling the morphological structures and the size of the coating materials is one of the most important factors for designing their functionality. The new approaches to the effect of surface properties at the atomic level on bacterial adhesion offer new perspectives on this subject. In this study, the effect of the different current densities on the morphological microstructural features, microhardness properties, and bacterial attachment behavior of the protective aluminum oxide layer was investigated by using different analytical and instrumental methods. The Staphylococcus aureus was used as a model bacteria for attachment tests. The result presented in the current study exhibited that the crystal morphology, microhardness, and bacterial adhesion features have changed depending on the applied current density. Increasing the current density from 1.5 to 1.7 raises the microhardness from 88 to 126 (Vickers) and causes higher surface roughness by 56 nm, 114 nm and 124 nm respectively. The high number of the attached bacteria were determined on the more roughness surface during the study.

  AtıfScopus3·WoS2·OpenAlex3

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• MakaleYalnız künye2023Scopus SJRQ3/r/gumushane/11623
  Investigation of the effect of liquid phase of digested biomass on Phaseolus vulgaris L. var. ellipticus Mart under NaCl stress

  Çiftçi, Fida; Acet, Tuba; Saribiyik, Oǧuz Yunus

  The factors such as global warming, wild irrigation, and synthetic fertilisers pollute the soil and increase salinity. The salinity is defined as salt stress for plants, and plants have developed various tolerance mechanisms to survive under salt stress conditions. Therefore, efforts to increase the tolerance of salt sensitive plants such as beans (Phaseolus vulgaris) are considered important. Additionally, considering problems that appear depending on global warming, understanding the tolerance mechanisms, and activating them by using natural and sustainable solutions are important for plant growth and preventing lower agricultural productivity. In this study, the effect of biofertiliser obtained from a small-scale bioreactor on a plant exposed to salt stress on the development of morphological, physiological, and biochemical properties of the model plant, Phaseolus vulgaris L. var. ellipticus Mart (Pve) were investigated. The biofertiliser application increased the amount of chlorophyll, flavonoids, anthocyanin, and proline while the amount of hydrogen peroxide and lipid peroxidation decreased in the plant. This change enhanced the enzyme activities of catalase (CAT), superoxide dismutase (SOD), and ascorbate peroxidase (APX) and the plant formed tolerance to the salt stress. As a result, the biofertiliser application to the plant may activate the tolerance mechanism against salt stress.

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• MakaleAçık Erişim2022/r/gumushane/17346
  Biyogazla Birlikte Oluşan Diğer Ürünlerin Araştırılması

  Saribiyik, Oguz Yunus

  Gelişmekte olan ülkelerin enerji tüketimindeki yükselme atmosfere karbondioksit salınımını artırarak küresel ısınmaya sebep olmaktadır. Küresel ısınmaya bağlı olarak ortaya çıkan doğal afetler insanların yaşamlarını olumsuz yönde etkilediklerinden dolayı atmosfere karbondioksit salınımının kontrol altına alınıp sürdürülebilir hale getirilmesi gerekmektedir. Bu sebeple fosil kökenli yakıtlara alternatif kaynaklarının araştırılması zorunlu hale gelmektedir. Rüzgâr enerjisi, biyodizel vb. gibi alternatif biyoyakıtlar içerisindeki alternatif enerji üretim yöntemlerinden birisi de biyogaz üretimidir. Biyogaz üretiminde uygun organik atıklar kullanılarak %35-45 CO2, %55-65 CH4 oranlarda biyogaz karışımı üretilirken eser miktarda CO, H2S, NH3 gibi diğer ürünlerde ortaya çıkmaktadır. Yapılan bu çalışmada biyogaz üretiminde kullanılan sıvı fazda bulunan toplam karbon miktarı, fenolik içerik miktarları, Azot(N), Fosfor(P2O5), Potasyum(K2O), pH, Hümik asit, Fülvik asit ve iletkenlik gibi değerlerin değişimi biyogaz üretimi öncesi ve sonrasında test edilerek belirlenmiştir. Elde edilen sonuçlara göre N, P, K miktarlarında herhangi bir değişim ortaya çıkmazken pH değerinde yükselme, fenolik içerik, toplam karbon içeriği, iletkenlik, Hümik ve Fülvik asit içeriklerinde biyogaz üretim süreci sonrasında artış meydana geldiği gözlemlenmiştir.

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  İncele
• MakaleAçık Erişim2021/r/gumushane/17627
  Fotobiyoreaktörde Işığın ve Beslemenin Alglerin Büyümeleri Üzerine Etkilerinin Araştırılması

  Aygün, Cemalettin; Saribiyik, Oguz Yunus; Sert, Batuhan; Uçmaz, Nergiz

  Dünya nüfusunun çoğalmasına bağlı olarak gıda ve enerji ihtiyaçları da artmaktadır. Enerji ve gıda tüketimi karbondioksit salınım miktarının yükselmesi ile yakından alakalıdır. Karbondioksit miktarının artması Sera gazı etkisi göstererek küresel ısınmaya sebep olmakta böylece doğal afetler yaşanmaktadır. Sera gazı etkisinin azaltılması için fosil kaynaklara alternatif enerji kaynakları bulunmalı ve atıkların sürdürülebilir şekilde kontrol edilerek geri dönüşüme kazandırılması gerekmektedir. Alternatif enerji kaynakları olarak biyogaz, biyodizel, güneş enerjisi gibi yenilenebilir enerji kaynakları yoğun şekilde araştırılmaktadır. Algler, alternatif gıda ve enerji ihtiyacını karşılamak için araştırılan kaynaklar arasında yer almaktadır. Bu canlılar, genel olarak ökaryotik fotosentez yapabilen canlıların genel tanımlamasıdır ve bu sınıf içerisinde çok farklı alt türleri bulunmaktadır. Yapılan çalışmalarda, 1 kg kuru alg oluşumu sırasında 1.83 kg CO2 tükettiği, yağ protein kaynağı ve organik gübre olarak kullanılabildiği görülmüştür. CO2 tüketim miktarının yüksek olması, alternatif besin ve yenilenebilir enerji kaynağı gibi farklı amaçlar için kullanılma potansiyelinden dolayı Alglerin uygun yaşam alanlarının belirlenmesi gerekmektedir. Yapılan bu çalışmada, hava karıştırmalı kolon tipi pilot fotobiyoreaktör imalatı yapılmıştır model alg üzerinde, ışığın ve beslenmenin büyüme üzerine etkileri araştırılmıştır. Model alg olarak ‘’Cladhopora glomerata’’ kullanılmıştır. Besleme için, inorganik tuzlar, %17’lik doğal kaynaklardan elde edilen amino asit çözeltisi ve 425 nm dalga boyuna sahip ışığın alglerdeki kütle artışı üzerine etkileri araştırılmıştır. Elde edilen sonuçlar, alglerin 425 nm dalga boyundaki (mor ışık) kütle artışı gün ışığındaki ışığa göre kıyaslandığında daha fazla kütle artışı gözlemlenmiştir. Bunun dışında alglerin kütle artışı beslemelerine göre kıyaslandığında %17 lik doğal amino asit kaynağı ile besleme yapıldığında inorganik tuzlara göre kütlece artışının daha fazla olduğu gözlemlenmiştir.

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  AtıfTR Dizin1

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• MakaleYalnız künye2021/r/gumushane/17529
  The Investigation of the Waste Effect on Biogas Production

  Uçar, İrfan Ruhi; Özer, Zekeriya; Saribiyik, Oguz Yunus

  The amount of the energy consumption rate are directly related to the such a parameters the welfare level and industrial revoluation. Additionally to those reason, the energy utilization intensively rises depending on the increasing world population and higher welfare level standarts. Carbon based fuels are not renewable and environmentally unfriendly therefore many of the research group and university have been working on renewable and sustainable energy sources such as hydrogen, solar, wind, geothermal, wave, biodiesel and biogas. Biogas production has been preferred beacuse of those reasons, easy construction and transportation, sustainability and also fermantated biomass is very effective fertiliser for agriculture in farms. The type of the reactor, the fermantation conditions, the feeding of the bacteria has increased the biogas production from different waste sources. In this study, 50 liter lab scale pilot reactor was designed and the fermantation conditions, and the effect of the different wastes such as vegetable waste, organic industrial waste and etc. were investigated on the biogas production yield. The results showed that fermentation condition and feeding play an important role for biogas production that tea dreg decrease the biogas while mulberry dreg and other vegetable sources increase the biogas production.

  AtıfTR Dizin4

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• MakaleAçık Erişim2021/r/gumushane/17503
  The Investigation of the Alternative Fuel Biogas Potential for Model Town

  Saribiyik, Oguz Yunus; Kılıç, Rahman

  The investigations have been intensively continuing for responding of energy and food demand depending on the world populationincrease and the development of the industrial progression. The energy necessities eliminate by using fossil fuels based sources suchas natural gas, coal and petrol. However, the amount of the fossil fuels is limited and they create the green houses gas problems,therefore, many of the researches have been focusing on new sustainable alternative energy sources, such as wind power, biodiesel,biogas, solar and biomass. The methane which is released by the methanogen bacteria is occupy a places in green gases which arecarbon dioxide and methane. Biogas as an alternative biofuel has higher impact in alternative fuels because of its applicability,sustainability, low production cost, keep the greenhouse gases in balance and produces bio-fertilizer after digestion processes. In thosepurposes, the biogas investment and investigation increases for all over the world however the potential of biomass conversion andthe examination for bio gas production have paid less concern in our country.In this study, the potential biomass and the amount of the biogas depending on the biomass potential have been investigated on one ofthe model town, Şiran in Gümüşhane. According to obtained results, it is seen that the biomass potential and the amount of the biogasproduction are highly enough for model town for natural gas demand and using bio fertilizer which is produced after digestion ofbiomass can be decreased by the utilization of the synthetic inorganic fertilizer, causing for soil pollution.

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  AtıfTR Dizin1

  İncele
• MakaleYalnız künye2021Scopus SJRQ3/r/gumushane/13000
  The effect of metalation processes on polymer morphology and conductivity properties

  Sarıbıyık, Oğuz Yunus; Gönül, İlyas; Ay, Burak; Karaca, Serkan

  In this work, an insoluble three dimensional (3D) porous polymeric structure and their metal complexes were synthesised by the condensation reactions of meta(m)-phenylenediamine, para(p)-phenylenediamine and glutaraldehyde. The morphological and spectral features of the porous polymeric structures were determined using different analytical and spectroscopic methods, including field emission scanning electron microscopy, four-point probe electrical conductivity, photoluminescence spectroscopy, Fourier-transform infrared spectroscopy, surface area Brunauer–Emmett–Teller and magnetic and thermal behaviours. According to the obtained data, the shape, size and photoluminescence properties of the compounds, especially the conductivity, were clearly changed after the metalation processes.

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