Browsing by Author "Kara, Ali"
Now showing 1 - 20 of 78
- Results Per Page
- Sort Options
Item Adsorpsiyonlu ısı pompa sistemlerinde alternatif malzemelerle gaz adsorpsiyonunun fizikokimyasal parametrelerinin belirlenmesi(Uludağ Üniversitesi, 2016-05-18) Dinibütün Katip, Nuray; Kara, Ali; Kılıç, Muhsin; Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Kimya Anabilim Dalı.Günümüzde enerji ihtiyacının hızla artması ve buna bağlı olarak enerji üretim kaynaklarının sınırlı ve enerji üretim maliyetinin yüksek olması, mevcut enerjinin etkin ve verimli bir şekilde kullanılması zorunluluğunu beraberinde getirmiştir. Bu sebeple sürdürülebilir ve yenilenebilir enerji kaynaklarının, özellikle ısıtma ve soğutma alanlarında kullanımı büyük önem taşımaktadır. Adsorpsiyonlu ısı pompası, sürdürülebilir ve yenilenebilir enerji kaynaklarının ısıtma ve soğutma amaçlı kullanımını sağlaması açısından son yıllarda dikkatleri üzerine çekmiştir. Adsorpsiyonlu ısı pompaları her türlü ısı enerjisi ile rahatlıkla çalışabilen ve elektrik enerjisi ihtiyacı oldukça az olan cihazlardır. Pompa haricinde hareketli parçası olmayan bu sistemlerde gürültü, titreşim gibi sorunlar olmadığı gibi bakımları da kolaydır. Özellikle atık ısı kaynakları, güneş enerjisi, jeotermal enerjisi veya herhangi bir ısı kaynağı doğrudan kullanılarak soğutma işleminin sağlanabilmesi bu tip ısı pompalarını cazip hale getirmiştir. Bu tip sistemler, enerjiyi depolayabilme ve daha sonra kesikli olarak kullanabilme imkanı yaratmasından dolayı da uygulamada avantaj sağlamaktadır. Adsorpsiyonlu ısı pompalarının performanslarını arttırmaya ve kullanım alanlarını genişletmeye yönelik çalışmalar artarak devam etmektedir. Adsorpsiyonlu ısı pompalarının tasarımı ve imalatı için, sistemde kullanılacak adsorbent-adsorbat çiftine ait adsorpsiyon karakteristiklerin detaylı olarak bilinmesini gerektirmektedir. Bu çalışmada adsorpsiyonlu ısı pompalarının çalışma prensipleri, detaylı bir literatür taraması, adsorpsiyon üzerine genel bilgiler, tasarlanan deney düzeneği ve sistemin deneysel sonuçları anlatılmıştır. Çalışma kapsamında mekanik soğutma sistemlerinde tercih edilen ve kullanımı yaygın olan ve düşük sıcaklık aralıklarında çalışabilmesi ve sistemde sızdırmazlık problemlerinin daha az olduğu florokarbon (HFC) tipi soğutucu akışkanlardan ilk olarak R134a ve daha sonra R404A adsorbat olarak seçilmiştir. Adsorbent olarak aktif-karbon, silika-jel, zeolit ve proje kapsamında üretilen polimerler kullanılmıştır. Daha sonra, bu düzenek üzerinde deneysel çalışmalar yapılmıştır. Bu deneyler sonucunda, aktif karbonun en iyi adsorblama performansı gösterdiği görülmüştür. Ancak silikajellerinde aktif karbona yakın adsorplama potansiyeli olduğu sonucuna varılmıştı.Item Adsorption and dielectric properties of poly(1-vinylimidazole) on sepiolite(Elsevier, 2012-03) Tekin, Nalan; Kaya, A. Uğur; Esmer, Kadir; Kara, Ali; Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Kimya Bölümü.; AAG-6271-2019; 7102824859The adsorption of poly(1-vinylimidazole) (PVI) onto sepiolite from aqueous solutions was investigated as a function of some parameters such as pH, ionic strength, and temperature. The adsorption of PVI was increased with increasing pH and with decreasing ionic strength and temperature. The Langmuir isotherm model fitted the isotherm data better than the Freundlich model. The electrophorotic mobility of sepiolite dispersions was measured at different PVI concentrations and pH. The thermodynamic parameters Gibbs free energy, enthalpy, and entropy were evaluated. The dimensionless separation factor (R-L.) revealed that sepiolite can be used for adsorption of PVI from aqueous solutions. The second-order kinetics equation best fitted the experimental data. Dielectric properties of sepiolite coated with PVI have been also investigated. The sample with adsorbed PVI at 25 degrees C has the maximum the AC conductivity and the charge carriers can move easily in comparison with other samples. The real permittivities of the PVI-adsorbed samples are quite high in comparison with those of the pure polymer as a result of interface interactions.Item Adsorption equilibrium, kinetics and thermodynamics of alpha-amylase on poly(DVB-VIM)-Cu+2 magnetic metal-chelate affinity sorbent(Springer, 2012-09) Osman, Bilgen; Kara, Ali; Demirbel, Emel; Kök, Şenay; Beşirli, Necati; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; AAG-6271-2019; ABF-4791-2020; 15221651200; 7102824859; 54681740300; 37054138900; 6507924888Designing an immobilised metal ion affinity process on large-scale demands that a thorough understanding be developed regarding the adsorption behaviour of proteins on metal-loaded gels and the characteristic adsorption parameters to be evaluated. In view of this requirement, interaction of alpha-amylase as a model protein with newly synthesised magnetic-poly(divinylbenzene-1-vinylimidazole) [m-poly(DVB-VIM)] microbeads (average diameter, 53-212 mu m) was investigated. The m-poly(DVB-VIM) microbeads were prepared by copolymerising of divinylbenzene (DVB) with 1-vinylimidazole (VIM). The m-poly(DVB-VIM) microbeads were characterised by N-2 adsorption/desorption isotherms, electron spin resonance, elemental analysis, scanning electron microscope and swelling studies. Cu2+ ions were chelated on the m-poly(DVB-VIM) beads and used in adsorption of alpha-amylase in a batch system. The maximum alpha-amylase adsorption capacity of the m-poly(DVB-VIM)-Cu2+ beads was determined as 10.84 mg/g at pH 6.0, 25 A degrees C. The adsorption data were analyzed using three isotherm models, which are the Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. The pseudo-first-order, pseudo-second-order, modified Ritchie's-second-order and intraparticle diffusion models were used to test dynamic experimental data. The study of temperature effect was quantified by calculating various thermodynamic parameters such as Gibbs free energy, enthalpy and entropy changes.Publication Adsorption of cinnabarinic acid from culture fluid with magnetic microbeads(Wiley, 2016-02-01) Sarıkaya, Aslı Göçenoğlu; Osman, Bilgen; Kara, Ali; Pazarlıoğlu, Nurdan; Besirli, Necati; GÖÇENOĞLU SARIKAYA, ASLI; OSMAN, BİLGEN; KARA, ALİ; Besirli, Necati; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü,; 0000-0002-7161-7003; 0000-0001-8406-149X; 0000-0003-2457-6314; AAC-6901-2020; ABF-4791-2020; JXW-6168-2024; AAG-6271-2019In this study, antimicrobial pigment cinnabarinic acid (CA) was produced from Pycnoporus cinnabarinus in laboratory-scale batch cultures. Magnetic poly(ethylene glycol dimethacrylate-N-methacryloyl-l-tryptophan methyl ester) [m-poly(EGDMA-MATrp)] beads (average diameter = 53-103 mu m) were synthesized by copolymerizing of N-methacryloyl-l-tryptophan methyl ester (MATrp) with ethylene glycol dimethacrylate (EGDMA) in the presence of magnetite (Fe3O4) and used for the adsorption of CA. The m-poly(EGDMA-MATrp) beads were characterized by N-2 adsorption/desorption isotherms (Brunauer Emmet Teller), X-ray photoelecron spectroscopy, scanning electron microscopy, infrared spectroscopy, thermal gravimetric analysis, electron spin resonance and swelling studies. The efficiency of m-poly(EGDMA-MATrp) beads for separation of CA from culture fluid was evaluated. The effects of pH, initial concentration, contact time and temperature on adsorption were analyzed. The maximum CA adsorption capacity of the m-poly(EGDMA-MATrp) beads was 272.9mgg(-1) at pH7.0, 25 degrees C. All the isotherm data can be fitted with the Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. The adsorption process obeyed pseudo-second-order kinetic model. Thermodynamic parameters H = 5.056kJmol(-1), S = 52.44JK(-1)mol(-1) and G = -9.424kJmol-(1) to -11.27kJmol-(1) with the rise in temperature from 4 to 40 degrees C indicated that the adsorption process was endothermic and spontaneous.Item Adsorption of Cr(VI) ions onto poly(ethylene glycol dimethacrylate-1-vinyl- 1,2,4-triazole)(Wiley, 2009-10-15) Kara, Ali; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Anabilim Dalı.; AAG-6271-2019; 7102824859Poly(ethylene glycol dimethacrylate-1-vinyl-1,2,4-triazole) [poly(EGDMA-VTAZ) beads (average diameter = 150-200 mu m) were prepared by copolymerizing ethylene glycol dimethacrylate (EGDMA) with 1-vinyl-1,2,4-triazole (VTAZ). Poly(EGDMA-VTAZ)] beads were characterized by swelling studies and scanning electron microscope (SEM). The adsorption of Cr(VI) from solutions was carried at different contact times, Cr(VI) concentrations, pH, and temperatures. High adsorption rates were achieved in about 240 min. The amount of Cr(VI) adsorbed increased with increasing concentration and decreasing pH and temperature. The intraparticle diffusion rate constants at various temperatures were calculated. Adsorption isotherms of Cr(VI) onto poly(EGDMA-VTAZ) have been determined and correlated with common isotherm equations such as Langmuir and Freundlich isotherm models. The Langmuir isotherm model appeared to fit the isotherm data better than the Freundlich isotherm model. The pseudo first-order kinetic model was used to describe the kinetic data. The study of temperature effect was quantified by calculating various thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy changes. The dimensionless separation factor (R-L) showed that the adsorption of metal ions onto poly(EGDMA-VTAZ) was favorable. It was seen that values of distribution coefficient (K-D) decreasing with Cr(VI) concentration in solution at equilibrium (C-e) indicated that the occupation of activate surface sites of adsorbent increased with Cr(VI).Item Adsorption of polyvinylimidazole onto kaolinite(Academic Press, 2006-04-15) Nalan, Tekin; Kadıncı, Emine; Demirbaş, Özkan; Alkan, Mahir; Kara, Ali; Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Kimya Bölümü.; AAG-6271-2019; 7102824859The adsorption of polyvinylimidazole (PVI) onto kaolinite from aqueous solutions has been investigated systematically as a function of parameters such as calcination temperature of kaolinite, pH, ionic strength, and temperature. According to the experimental results, the adsorption of PVI increases with pH from 8.50 to 11.50, temperature from 25 to 55 degrees C, and ionic strength from 0 to 0.1 mol L-1. The kaolinite sample calcined at 600 degrees C has a maximum adsorption capacity. Adsorption isotherms of PVI onto kaolinite have been determined and correlated with common isotherm equations such as Langmuir and Freundlich isotherm models. The Langmuir isotherm model appeared to fit the isotherm data better than the Freundlich isotherm model. The physical properties of this adsorbent are consistent with the parameters obtained from the isotherm equations. Furthermore, the zeta potentials of kaolinite suspensions have been measured in aqueous solutions of different PVI concentrations and pH. From the experimental results, (i) pH strongly alters the zeta potential of kaolinite; (ii) kaolinite has an isoelectric point at about pH 2.35 in water and about pH 8.75 in 249.9 ppm PVI concentration; (iii) PVI changes the interface charge from negative to positive for kaolinite. The study of temperature effect has been quantified by calculating various thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy changes. The dimensionless separation factor (R-L) has shown that kaolinite can be used for adsorption of PVI from aqueous solutions.Item Akrilonitril bütadien (nbr) kauçuğunun ve yapıştırıcısının sentezi, karakterizasyonu ve demir metaline yapıştırılması(Bursa Uludağ Üniversitesi, 2019-09-11) Sevinç, Ümit; Kara, Ali; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Fizikokimya Anabilim Dalı.; 0000-0002-8488-9032Bu çalışmada bir elastomer türü NBR (Akrilonitril Bütadien) kauçuğunun ve yapıştırıcısının sentezi, karakterizasyonu ve demir metaline yapışması araştırılmıştır. NBR kauçuğunun formülasyonunun oluşturulması, üretim aşamaları incelenmiştir ve daha sonra bu kauçuğun reolojik özellikleri, mekanik özellikleri, şişme testleri ve termal analizleri incelenmiştir. Sentezlenen kauçuğa uygun kauçuk-metal yapıştırıcısının formülasyonunun oluşturulması, sentezlenmesi incelenmiştir ve daha sonra bu sentezlenen kauçuk-metal yapıştırıcısının reolojik özellikleri ve termal analizleri incelenmiştir. Kauçuğun yapıştırıldığı metalin yüzey hazırlığı proseslerinin incelenmesi ve yüzey geriliminin ölçülmesi incelenmiştir.Item Alanine containing porous beads for mercury removal from artificial solutions(Wiley, 2006-04-15) Şenel, Serap; Karabakan, Abdülkerim; Denizli, Adil; Kara, Ali; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; AAG-6271-2019; 7102824859N-methacryloyl-(L)-alanine (MALA) was synthesized by using methacryloyl chloride and alanine as a metal-complexing ligand or comonomer. Spherical beads with an average diameter of 150-200 mu m were obtained by suspension polymerization of MALA and 2-hydroxyethyl methacrylate (HEMA) conducted in an aqueous dispersion medium. Poly(HEMA-MALA) beads were characterized by SEM, swelling studies, surface area measurement, and elemental analysis. Poly(HEMA-MALA) beads have a specific surface area of 68.5 m(2)/g. Poly(HEMA-MALA) beads with a swelling ratio of 63%, and containing 247 mu mol MALA/g were used in the removal of H g(2+) from aqueous solutions. Adsorption equilibrium was achieved in about 60 min. The adsorption of Hg2+ ions onto PHEMA beads was negligible (0.3 mg/g). The MALA incorporation into the polymer structure significantly increased the mercury adsorption capacity (168 mg/g). Adsorption capacity of MALA containing beads increased significantly with pH. The adsorption of Hg2+ ions increased with increasing pH and reached a plateau value at around pH 5.0. Competitive heavy metal adsorption from aqueous solutions containing Cd2+, Cu2+, Pb2+, and Hg2+ was also investigated. The adsorption capacities are 44.5 mg/g for Hg2+, 6.4 mg/g for Cd2+, 2.9 mg/g for Pb2+, and 2.0 mg/g for Cu2+ ions. These results may be considered as an indication of higher specificity of the poly(HEMA-MALA) beads for the Hg2+ comparing to other ions. Consecutive adsorption and elution operations showed the feasibility of repeated use for poly(HEMA-MALA) chelating beads.Item Antimicrobial effect of PEG-PLA on food-spoilage microorganisms(Korean Society Food Science & Technology-Kosfost, 2017-06-24) Şahan, Yasemin; Gürbüz, Ozan; Goncagül, Gülşen; Kara, Ali; Özakın, Cüneyt; Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; Uludağ Üniversitesi/Tıp Fakültesi/Mikrobiyoloji ve Enfeksiyon Hastalıkları Anabilim Dalı.; 0000-0001-7871-1628; 0000-0001-5428-3630; ABE-6748-2020; K-1499-2019; AAK-6555-2021; AAG-8392-2021; 25629856600; 8528582100; 8350555500; 7102824859; 57200678942Polyethylene glycol (PEG) and polyethylene glycol-polylactic acid (PEG-PLA) have an organic structure and no negative effect on human health. The present study compares the antimicrobial effectiveness of PEG and PEG-PLA on microbial growth. The following pathogens and fungi were examined: seven bacteria strains and 10 fungi (four yeasts and six molds). PEG, a non-modified polymer, exhibited no inhibition effect on all test microorganisms. However, the antimicrobial effect increased with the concentration of PEG-PLA. Bacteria showed more sensitivity to PEG-PLA compared with the other microorganisms used in this study. Enterobacter ATCC 19434 was found to be the most resistant bacteria. Molds and yeasts were more resistant than bacteria against PEG-PLA. MIC and MFC could not be determined on the tested fungi owing to the level of concentrations used, with the exception of the yeast Candida albicans and the molds Penicillium expansum and Aspergillus parasiticus.Item Assesment of dimethyl phthalate removal from aqueous phase using barium hexaferrite containing magnetic beads(Academic Press Inc Elsevier Science, 2012-07-15) Osman, Bilgen; Özer, Elif Tümay; Kara, Ali; Güçer, Şeref; Beşirli, Necati; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0003-0610-2019; AAI-3137-2021; ABF-4791-2020; 15221651200; 37047586000; 7102824859; 36849130600; 6507924888The barium hexaferrite (BaFe12O19) containing magnetic poly (ethylene glycol dimethacrylate-vinyl pyridine; mag-poly [EGDMA-VP]) beads (average diameter = 53-212 mu m) were synthesized and characterized. Their use as an adsorbent in the removal of dimethyl phthalate (DMP) from an aqueous solution was investigated. The mag-poly (EGDMA-VP) beads were prepared by copolymerizing of 4-vinyl pyridine (VP) with ethylene glycol dimethacrylate (EGDMA). The mag-poly (EGDMA-VP) beads were characterized by N-2 adsorption/desorption isotherms (BET), vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), elemental analysis, scanning electron microscope (SEM), and swelling studies. At a fixed solid/solution ratio, the various factors affecting the adsorption of DMP from aqueous solutions such as pH, initial concentration, contact time, and temperature were analyzed. The maximum DMP adsorption capacity of the mag-poly (EGDMA-VP) beads was determined as 96.2 mg/g at pH 3.0, 25 degrees C. All the isotherm data can be fitted with both the Langmuir and the Dubinin-Radushkevich isotherm models. The pseudo-first-order, pseudo-second-order, Ritch-second-order, and intraparticle diffusion models were used to describe the adsorption kinetics. The thermodynamic parameters obtained indicated the exothermic nature of the adsorption. The DMP adsorption capacity did not change after 10 batch successive reactions, demonstrating the usefulness of the magnetic beads in applications.Item Çapraz bağlı polimerlerin sentezi ve iyon seçimliliklerinin incelenmesi(Uludağ Üniversitesi, 2004-12-17) Kara, Ali; Beşirli, Necati; Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Kimya Anabilim Dalı.Bu doktora tezi dört bölümden oluşmaktadır. İlk bölümde, makroçaprazbağlayıcılar (MCR) sentezlenmiş ve sürenin polimerizasyonunda kullanılarak, çapraz bağlı polimerik mikroküreler sentezlenmiştir. Çapraz bağlayıcı olarak kullanılan MCR'lerin mol kütlelerine bağlı olarak polimer dönüşüm oram, çapraz bağlanma dereceleri ve denge şişme oranlan belirlenmiştir. İyon değiştirici reçinelerin sentezlenmesi için, dumanlı sülfürik asit (oleum) kullanılarak, çapraz bağlı polimerik mikrokürelere sülfo grupları takılmıştır. Polimerik ürünlerin karakterizasyonunda FTIR, NMR ve elementel analiz yöntemleri kullanılmıştır. İkinci bölümde, N-Vinil imidazol (N-VİM) ve çapraz bağlayıcı olarak etilenglikol dimetakrilat (EGDMA) kullanılarak, süspansiyon polimerizasyon yöntemiyle çapraz bağlı poli (etilenglikol dimetakrilat-N-vinil imidazol) [poli(EGDMA-N-VİM)] kopolimer mikroküreler sentezlenmiştir. Bu polimerin karakterizasyonunda FTIR, elementel analiz ve SEM yöntemlerinden yararlanılmıştır. Üçüncü bölümde, sentezlenen iyon değiştiricilerin Cr(III), Cu(II), Zn(II) ve K(I) metal iyonlarına karşı seçimlilikleri incelenmiş, seçimlilik sırasının Cr(III) > Cu(II) > Zn(II) > K(I) şeklinde olduğu belirlenmiştir. Dördüncü bölümde, poli(EGDMA-N-VİM) çapraz bağlı kopolimer mikrokürelerin Cr(III), Cu(II), Zn(II) ve K(I) metal iyonlarına karşı seçimlilikleri incelenmiş ve seçimliliğin Cu(II) > Zn(II) > Cr(III) > K(I) sırasında olduğu belirlenmiştir. Bu sonuçlar, reçinelerin iyon değişimi (toplam adsorpsiyon) özellikleri ile karşılaştırılmıştır.Item Çeşitli oksimlerin sentezi ve özelliklerinin incelenmesi(Uludağ Üniversitesi, 1995) Kara, Ali; Sümengen, Doğan; Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Kimya Anabilim Dalı.Amidoksimlerin teknolojide pekçok uygulama alanı vardır. Birkaç aromatik amidoksimin yağ devir sisteminde korrozyonu önlediği bilinmektedir. Amidoksimler başlıca polimer kimyasında kullanılırlar. Deniz suyundan uranyum elde edilişindeki önemi nedeniyle bu alanda ciddi araştırmalar yapılmakta olup, poliakriloamidoksimler en iyi adsorbanlar arasında yer almaktadır. Bu çalışmada birkaç yeni amidoksim hidroksimik asid klorürlerinin primer veya sekonder aminlerle reaksiyonundan elde edildiler. Bu bileşiklerin yapıları İR, NMR ve kütle spektrumları ile belirdendiler.Item Determination of the energy, mass flow and temperature parameters in combustion systems of agricultural biomass residues(Triveni Enterprises, 2017-06-28) Ünal, Halil; Kara, Ali; Uludağ Üniversitesi/Ziraat Fakültesi/Biyosistem Mühendisliği Bölümü.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0003-2457-6314; AAH-4410-2021; 55807866400; 7102824859Aim : This study was carried out to determine the energy, mass flow and temperature computations of agricultural biomass. Methodology : The feasibility of the technique which enable to formulate a balanced chemical equation using the parameters of biomass moisture content and excess air utilized in combustion was determined for agricultural biomass residues (corn cob and hazelnut shell). The chimney gas composition was calculated assuming that carbon dioxide and water were completely consumed. The combustion temperature was obtained with an energy balance. Results : Because of the error value of corn cob was negative, accepted combustion heat of this fuel was determined high (1400 degrees K) and concluded. It should have been reduced down to feasible value of this temperature. On the other hand, because of the error value for hazelnut shell was positive, raising the combustion heat is recommended. Feasible combustion heats for corn cob and hazelnut shell were 1389 degrees K and 1437 degrees K, respectively. While heat of combustion of corn cob in dry basis was 1436 degrees K for excess air parameter 1.0, the heat of combustion in 0.5 moisture level was 1132 degrees K with 27% reduction. The hazelnut shell combustion heat was also determined as 1205 degrees K with about 23% reduction. The net heats of combustion of corn cob and hazelnut shells in wet basis were determined as 13,109 and 15,775 kJ kg(-1), respectively. Interpretation : The biomass moisture, excess air and heat losses from system were in accordance with each other.Item Diethyl phthalate removal from aqueous phase using poly(EGDMA-MATrp) beads: Kinetic, isothermal and thermodynamic studies(Taylor & Francis, 2015-07-03) Özer, Elif Tümay; Osman, Bilgen; Kara, Ali; Demirbel, Emel; Beşirli, Necati; Gücer, Şeref; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0002-5225-0146; 0000-0001-8406-149X; 0000-0003-2457-6314; AAI-3137-2021; ABF-4791-2020; AAG-6271-2019; ESF-6302-2022; CGK-8659-2022; GAV-3362-2022; 37047586000; 15221651200; 7102824859; 54681740300; 6507924888; 36849130600In this study, poly(ethylene glycol dimethacrylate-N-methacryloyl-l-tryptophan methyl ester) [poly(EGDMA-MATrp)] beads (average diameter = 106-300 mu m), which were synthesized by co-polymerizing of N-methacryloyl-l-tryptophan methyl ester (MATrp) with ethylene glycol dimethacrylate (EGDMA), were used for diethyl phthalate (DEP) adsorption. The various factors affecting the adsorption of DEP from aqueous solutions such as pH, initial concentration, contact time and temperature were analysed. Adsorption behaviour of DEP on the poly(EGDMA-MATrp) beads was investigated by varying pH values of solution, contact time, initial concentration and temperature. An optimum adsorption capacity of 590.7 mg/g for DEP was obtained at 25 degrees C. The present adsorption process obeyed a pseudo-second-order kinetic model. All the isotherm data can be fitted with the Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. Thermodynamic parameters Delta H = 7.745 kJ/mol, Delta S = 81.92 J/K/mol and Delta G = -16.69 kJ/mol to -18.31 kJ/mol with the rise in temperature from 25 degrees C to 45 degrees C indicated that the adsorption process was endothermic and spontaneous.Item Doğal ve sentetik uyuşturucu maddeler, suça sürüklenen çocuklar ve çocuk suçlarının kriminal açıdan modellemesinin yapılması(Bursa Uludağ Üniversitesi, 2022-06-24) Altınsoy, Ercan; Kara, Ali; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Kriminalistik Anabilim Dalı.; 0000-0003-3114-3613Ülkemizde ve dünyada çocuk suçluluğunun nedenleri üzerine birçok araştırmalar yapılmıştır. Bunun temel nedeni çocukların suça sürüklenmesinin engellenmesi aynı zamanda suçla mücadelenin bir parçası olarak görülmesidir. Çünkü küçük yaşlarda suç işleyen bireylerin ileriki yaşlarda suç kariyerini artırdığı, bu alanda çalışan tüm araştırmacılar tarafından kabul edilen bir gerçektir. Çocukların suça sürüklenmesine neden olan en önemli faktör uyuşturucu bağımlılığıdır. Türkiye’de kırsal bölgede 0-18 yaş arası çocukların suça sürüklenmesi ile uyuşturucu arasında anlamlı bir bağ olup olmadığı, ayrıca çocukların suça sürüklenmesine etki eden faktörlerin neler olduğunun ortaya çıkartılması amacı ile Jandarma Olaylar Bilgi Sisteminden alınan 2018, 2019, 2020 yıllarına ait veriler IBM SPSS 21.0 istatistik paket programı kullanılarak analiz edilmiştir. Yapılan çalışmalar neticesinde uyuşturucu kullanımı ile çocukların suça sürüklenmesi arasında anlamlı bir bağ olduğu bulunmuştur. Ayrıca kırsal bölgede çocukların suça sürüklenmesine etki eden faktörler ortaya konulmuş ve yorumlanmış, suçun cinsi, nedeni ve suç işlenen mekânın özelliği gibi hususlar da incelenerek suçun işlenmesine etki eden diğer faktörlerin de neler olduğu saptanmıştır. Bu araştırma neticesinde elde edilen bulguların çocukların suça sürüklenmesini engellemeye katkı sağlayacağı aynı zamanda suçla mücadeleye de destek vereceği görülmüştür.Item Effect of chemical modification with 4-vinylpyridine on dyeing of cotton fabric with reactive dyestuff(Springer, 2018-11) Toprak, Tuba; Anis, Pervin; Kutlu, Egemen; Kara, Ali; Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0001-8475-3197; 0000-0003-2457-6314; B-5740-2017; AAH-3948-2021; JKA-6533-2023; AAG-6271-2019; 57191611318; 6505864579; 57203903282; 7102824859Cotton fabrics were pre-treated with 4-vinylpyridine before dyeing to increase dye uptake. Various treatments for the application of monomers to fabrics were tried in different combinations and after dyeing the best result was obtained with alkali impregnation and monomer exhaustion. After decisions had been made on the processes to be applied before dyeing, different amounts of monomer, dyestuff and salt were used in reactive dyeing baths at different pHs. The results were evaluated in terms of color coordinates, color strength, FT-IR and fastness to washing, rubbing and perspiration. The best results were obtained with 3ml of 4-vinylpyridine dissolved in 10ml of alcohol, in the presence of 25g L-1 of salt and in neutral medium at 5% dyestuff concentration. Color strength from this dyeing process was higher than from the conventional dyeing at the same dyestuff concentration. FT-IR analysis demonstrated the presence of monomer on the surface of the fabric. Fastness values showed that this method could be used as an alternative to the conventional method.Item The effect of polyacrylamide (PAM) applications on infiltration, runoff and soil losses under simulated rainfall conditions(Academic Journals, 2011-04-11) Tümsavaş, Zeynal; Kara, Ali; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Anabilim Dalı.; Uludağ Üniversitesi/Ziraat Fakültesi/Toprak Bilimi ve Bitki Besleme Bölümü.; AAG-6271-2019; 6507710594; 7102824859One of the major causes of soil degradation throughout the world is water erosion. Anionic polyacrylamide (PAM) application to soils is an effective soil conservation practice for reducing runoff and soil losses caused by erosion. It also increases the infiltration rate of soils. The objective of this study was conducted to determine effects of different application rates of PAM (0 (control), 1.667, 3.333 and 5.000 kg.ha(-1)) on infiltration rate, runoff and soil losses. Polyacrylamide was sprayed on the surface of the experimental soils with different textures. The PAM treated soils were introduced to simulated rainfall at 61 mm/h intensity for an hour. The results indicated that, PAM applications significantly reduced surface runoff and soil losses, but increased infiltration rates. The effectiveness of PAM was higher in clay and clay loam soils than that of sandy clay loam soil. The most effective applications rates of PAM on reducing surface runoff and soil losses and increasing infiltration rates were found to be 3.333 and 5.000 kg.ha(-1). By considering the price and application cost of PAM, It was suggested that 3.333 kg.ha(-1) PAM is the most suitable application rate. As compared with the control, it was obtained that PAM application with a rate of 3.333 kg.ha(-1) reduced surface runoff and soil losses by 23.1 and 18.5%, respectively and increased infiltration rate by 24%.Item Effect of polyethylene glycol coating on Salmonella enteritidis in artificially contaminated eggs(Taylor & Francis, 2012) Goncagül, Gülşen; Şahan, Yasemin Bengü; Gürbüz, Ozan; Kara, Ali; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0001-7871-1628; ABE-6748-2020; AAK-6555-2021; K-1499-2019; 8350555500; 25629856600; 8528582100; 7102824859This experimental infection study focuses on a specific Salmonella micro-organism commonly found inside hens' eggs. It outlines the application of polyethylene glycol-based films on hens' eggs and microbial growth introduced via transovarian contamination. Three molecular weights of polyethylene glycol ( PEG) were studied: ranging from 1000 g/mol to 3000 g/mol. PEG coating ratios averaged a PEG film thickness of 0.014 +/- 0.006 mm and average eggshell thickness was 0.32 +/- 0.022 mm. The effects of molecular weight of PEG coating and storage time on the growth of Salmonella enteritidis of PEG-coated eggs were evaluated during 30 days of incubation in 37 degrees C storage. The initial concentration of 8 log(10) CFU/mL was achieved by inoculation. The lowest level of S. enteritidis at the end of 30-day incubation period was 5.07 +/- 0.03 log(10) CFU/mL, giving an inhibition efficiency of 33.83%. This level was achieved with a PEG coating of 1.0449 +/- 0.005 density and 0.02 +/- 0.01 film thickness.Item Electrical properties of poly(ethylene glycol dimethacrylate-n-vinyl imidazole)/single walled carbon nanotubes/n-Si schottky diodes formed by surface polymerization of single walled carbon nanotubes(Elsevier Science, 2012-01-01) Tekin, Nalan; Beyaz, Saadet; Koçkar, Hakan; Ahmetoğlu, Muhitdin; Kara, Ali; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; AAG-6271-2019; 16021109400; 7102824859In this paper we report the electrical characteristics of the Schottky diodes formed by surface polymerization of the Poly(ethylene glycol dimethanylate-n-vinyl imidazole)/Single Walled Carbon Nanotubes on n-Si The Single Walled Carbon Nanotubes were synthesized by CVD method. The main electrical properties of the Poly(ethylene glycol dimethanylate-n-vinyl imidazole)/Single Walled Carbon Nanotubes/n-Si have been investigated through the barrier heights, the ideality factors and the impurity density distribution, by using current-voltage and reverse bias capacitance voltage characteristics. Electrical measurements were carried out at room temperature. Poly(ethylene glycol dimethacrylate-n-vinyl imidazole)/Single Walled Carbon Nanotubes/n-Si Schottky diode current-voltage characteristics display low reverse-bias leakage currents and average barrier heights of 0.61 +/- 0.02 eV and 0.72 +/- 0.02 eV obtained from both current-voltage and capacitance-voltage measurements at room temperature, respectively.Publication Electrochemically characterized energy storage properties of Ni foam/poly (EGDMA-Co-VPCA)/SWCNT composite electrode produced by surface polimerization method(Elsevier, 2021-05-21) Yıldırım, Hasan; Tokgöz, Seyit Rıza; Peksöz, Ahmet; Kara, Ali; Yıldırım, Hasan; TOKGÖZ, SEYİT RIZA; PEKSÖZ, AHMET; KARA, ALİ; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0001-6552-1112; 0000-0003-4050-4222; 0000-0001-9135-1508; 0000-0003-2457-6314; AHB-9353-2022; HRA-2244-2023; IXW-9711-2023; A-8113-2016Poly (EGDMA-co-VPCA)/SWCNT composite film is successfully synthesized on Ni foam substrate by surface polymerization technique. Energy storage properties of Ni foam/poly (EGDMA-co-VPCA)/ SWCNT composite electrode are investigated via cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The as-prepared Ni foam/poly (EGDMA-co-VPCA)/ SWCNT composite electrode exhibits high specific capacitance of 100 F/g at 5 A/g, high power density of 3285.0 W/kg at 8.5 Wh/kg energy density, capacitive retention of 77.7% after 5000 charge-discharge cycles and excellent chemical stability.