Person: KARA, ALİ
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KARA
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ALİ
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Publication Investigation of anti-pilling properties of different fabrics applied with polyvinylcaprolactam(E.U. Printing and Publishing House, 2023-01-01) Büyükkoru, Burcu; Kara, Ali; Büyükkoru, Burcu; KARA, ALİ; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0001-2345-6789; 0000-0003-2457-6314; JMK-8117-2023; IME-4534-2023Pilling is one of the most important problems in the textile industry still not confidently solved. The problem is a kind of mechanically caused fabric defect consisting by a series of roughly spherical masses of entangled fibers called pills. Many studies have been carried out to define this problem in detail, determine the pilling intensity by different methods and improve the pilling grades of fabrics. One of the most beneficial methods to improve values is chemical finishing by applying specific polymers. In this study, a specific synthesized anti-pilling polymer was used for chemical finishing by padding method. A specific polymer based on polyvinylcaprolactam (PVCL) was synthesized and applied on the fabrics. The polymer has been characterized with FT-IR, NMR, DSC, elemental analysis devices also to optimize application-parameters. Especially pilling grades of blended fabrics of natural and synthetic staple fibres are often worser then other non blended fabrics, PVCL polymer was applied on a selection of different polyester cotton blends or polyester viscose blend, which have pilling values between 2-3. PVCL-Polymer applications were carried out by using these 7 different fabrics. As a result, approximately 1.5-2 pilling degree improvement was achieved. Anti-pilling polymers applied on the fabrics used to improve pilling values often decrease hydrophilicity values of the fabrics and worsen touch. However, the specific PVCL-polymer does not lead to a loss of smooth hand neighter to a loss of smooth fabric touch. On the contrary, it improves both hydrophilicity and smooth touch not causing fabric yellowing. PCVL is distinguished from other products used for pilling improvement in the textile industry.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; 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.Publication Ph effects on reactive orange 16 adsorption of m-poly(divinyl benzene-n-vinyl imidazol) microbeads(Yıldız Teknik Üniversitesi, 2021-03-01) Kaplan, Büşra Elif; Kara, Ali; Eren, Huseyin Aksel; Kaplan, Büşra Elif; Kara, Ali; KARA, ALİ; Eren, Huseyin Aksel; EREN, HÜSEYİN AKSEL; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0003-3908-5139; AFL-4209-2022In this study, Reactive Orange 16, which is a reactive dye, was investigated by using magnetic poly (DVB-VIM) to determine the effect of pH on adsorption. For this reason, the effect of pH on adsorption has been investigated in detail in pH: 2 and pH: 12. Magnetic poly (DVB-VIM) microbeads were characterized by scanning electron microscopy (SEM), fourier-transform infrared spectroscopy (FTIR) studies and swelling studies.Publication Electrical and optical properties of photodiode structures formed by surface polymerization of P(Egdma-Vpca)-Swcnt films on n-si(Elsevier, 2019-06-20) Kirezli, B.; Gücüyener, İsmet; Kara, A.; Kaplan, H. K.; Afrailov, Muhitdin Ahmetoğlu; Kirezli, B.; GÜCÜYENER, İSMET; KARA, ALİ; KAPLAN, HÜSEYİN KAAN; Afrailov, Muhitdin Ahmetoglu; Fen Edebiyat Fakültesi; Fizik Bölümü; 0000-0003-2457-6314; 0000-0002-4144-5837; 0000-0002-9555-6903; KDM-6805-2024; A-4861-2018; AAG-6271-2019; GWV-7916-2022; FEP-7816-2022Poly (ethylene glycol dimethacrylate-1-vinyl-1H-pyrrole-2-carboxylic acid)/carbon nanotube, single-walled)/n-Si ([P(EGDMA-VPCA)-SWCNT]/n-Si) photodiode structures was fabricated by using surface polymerization method. While electrical properties were measured at different temperatures, optical properties were measured at room temperatures. Dark and light current characteristics were investigated. Spectral photoresponse measurements of the structure were realized at room temperature. They showed that the fabricated structure exhibited rectification behavior, which makes it a good nominee for optoelectronic implementation area.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; Fen Edebiyat Fakültesi; Fizik 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.Publication Physicochemical parameters of hg(ii) ions adsorption from aqueous solution by sepiolite/polyvinylimidazole)(Elsevier Sci Ltd, 2016-06-01) Tekin, Nalan; Şafaklı, Akif; Kara, Ali; KARA, ALİ; Alan, Aysu; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0003-2457-6314; AAG-6271-2019The sepiolite/Poly(vinylimidazole) (sepiolite/PVI) composite was prepared by in situ polymerization of vinyl imidazole (VIM) and sepiolite, which was not modified. Fourier Transform Infrared (FTIR) analysis, X-ray diffraction (XRD) spectra, Scanning Electron Microscopy (SEM) images and Differential Scanning Calorimetry (DSC) exhibited that sepiolite/PVI composite was successfully produced. The theoretical maximum adsorption capacity was calculated to be 345.3 mg g(-1) (concentration range of 100-1000 mg L-1) in Hg(II) solution at pH 6.5 at 298 K. The adsorption kinetics and isotherms were also investigated for the adsorption process. The adsorption isotherms data were well fitted to the Langmuir model for the adsorption of Hg(II) onto sepiolite/PVI. The thermodynamic parameters (Delta G', Delta H degrees, and Delta S degrees) were calculated which the composite could be considered as a spontaneous, endothermic and mainly physical adsorption process. The equilibrium parameter (R-L) indicated that sepiolite/PVI composite was useful for Hg(II) removal from aqueous solutions.Publication Synthesis and characterization of polyvinylimidazole and investigation of its antipilling effect on different fabrics(E.U. Printing and Publishing House, 2021-09-30) Büyükkoru, Burcu; Kara, Ali; Büyükkoru, Burcu; KARA, ALİ; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0003-2457-6314; 0000-0002-3399-9899; CIH-1820-2022; AAG-6271-2019Pilling is one of the major concerns in textile industry. To improve pilling values of the fabrics, some methods have been reported. One of which is chemical finishing. In this study, these chemical finishing methods have been used. A key differentiator of this study is that the polymer employed as an anti-pilling agent was synthesized by the researchers of this study and does not negatively affect the hydrophilicity and brightness of fabrics. As most anti-pilling chemicals, polyvinylimidazole (PVIM) was synthesized and applied to fabrics to reduce the pilling tendency. 1.5-2 degrees improvement was observed in the pilling values ranged 4.5-5.0, which means there were no pills on the fabric surface. It has also been proven that PVIM can be used as an anti-pilling agent without negative effects on fabrics in terms of hydrophilicity, brightness and hand. The PVIM was named RUCO-PLAST EPG 18042 to be included in Rudolf-Duraner's product list.Publication Investigation of the pilling properties of polyvinyl phosphonic acid treated fabrics(Gazi Üniversitesi, 2022-01-01) Büyukkoru, Burcu; Kara, Ali; Büyukkoru, Burcu; KARA, ALİ; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0003-2457-6314; CIH-1820-2022; AAG-6271-2019Pilling is an important quality problem in the textile industry and is defined as a fabric defect consisting of a tangle of fibers on the fabric surface. To define this problem, to determine the pilling values with different methods and to improve the pilling values, many studies have been conducted and reported in the literature. This work is about improving the pilling values of fabrics. One of the most effective methods used is chemical finishing. Polyvinyl phosphonic acid (PVPA) is synthesized and characterized to be applied to fabrics in order to reduce the pilling of the fabrics. PVPA was applied to 5 different fabrics by using foulard method in different solution concentrations. Blended fabrics such as polyester, cotton blend or polyester, viscose blend with pilling values between 2-3 were generally chosen, since the pilling values of these blended fabrics are worse and difficult to improve. PVPA effectively led to an improvement of about 1.5-2 degrees of pilling on all fabrics. As the concentration of PVPA increased, pilling and hydrophilicity values improved. It differs from other products to reduce pilling, especially in that it also increases hydrophilicity and is effective in various fabrics such as viscose, polyester, and blended fabrics.Publication Electrical and optical properties of photodiode structures formed by surface polymerization of [p (egdma-vpca)-swcnt] films on n-gaas(Elsevier Science Bv, 2019-09-15) Kirezli, Burcu; Ahmetoglu (Afrailov), Muhitdin; AHMETOĞLU, MUHİTDİN; Kara, Ali; KARA, ALİ; Fen Edebiyat Fakültesi; Fizik Bölümü; 0000-0003-2457-6314; AAG-6271-2019; KDM-6805-2024Poly (ethylene glycol dimethacrylate-1-vinyl-1H-pyrrole-2-carboxylic acid)/carbon nanotube, single-walled)/n-GaAs ([P (EGDMA-VPCA)-SWCNT]/n-GaAs) photodiode structures were fabricated by using surface polymerization method. Electrical and optical properties were measured at several temperatures. Dark and light current characteristics were investigated. Spectral photoresponse measurements of the structure were made at room temperature. The maximum open circuit voltage (Voc) and short-circuit current (Isc) values for the diode under 20 mW/cm(2) were obtained to be 0.52 V and 54.63 mu A respectively. That showed that the fabricated structure exhibited rectification behavior that makes it a good candidate for optoelectronic device applications.Publication Synthesis and characterization of polymer microspheres and its application for phenol adsorption(Desalination Publ, 2019-08-01) Özdemir, İnci; Kara, Ali; Tekin, Nalan; Olgun, Asim; KARA, ALİ; OLGUN, ASİM; Fen Sanat Fakültesi; Kimya Bölümü; 0000-0003-2457-6314; AAG-6271-2019; ABD-2316-2020This paper reports synthesis of the poly(ethylene glycol dimethacrylate-n-vinyl imidazole) ([poly(EGDMA-VIM)]) microspheres by suspension polymerization for the removal of phenol from an aqueous solution. The synthesized [poly(EGDMA-VIM)] microspheres were characterized by various analysis techniques. The [poly(EGDMA-VIM)] microspheres possessed a high specific surface area (304.4 m2 g(-1)). It was found that the pseudo-second-order kinetic and Freundlich isotherm models could well define the phenol adsorption process. The maximum capacity of the [poly(EGDMA- VIM)] microspheres was calculated to be 34.7441 mg g(-1) at 298 K and natural pH from Langmuir isotherm. The adsorption thermodynamics revealed that the adsorption of phenol was an exothermic and spontaneous process. The [poly(EGDMA-VIM)] microspheres were easily regenerated by using a 0.01 M NaOH solution, and were repeatedly used for at least 5 cycles without losing the adsorption capacity. The experimental results suggest that the [poly(EGDMA-VIM)] microspheres can be implemented as a promising adsorbent for phenol removal from wastewater.