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Öğe Antimicrobial activity of colloidal silver nanoparticles prepared by sol-gel method(2011) Lkhagvajav N.; Yaşa I.; Çelik E.; Koizhaiganova M.; Sari O.In this study, the antimicrobial activity of colloidal silver nanoparticles prepared by the sol-gel method was investigated, and the turbidity, viscosity and pH of the colloidal solutions were determined. The size of the silver nanoparticles was measured by Atomic Force Microscopy (AFM). The minimum inhibitory concentration (MIC) value of the colloidal solution resistance to test microorganisms Escherichia coli, Staphylococcus aureus, Candida albicans, Bacillus subtilis, Salmonella typhimurium, Pseudomonas aeruginosa and Klebsiella pneumoniae was carried out by the Broth Microdilution Method. It was found that the silver nanoparticles inhibited the growth and multiplication of the tested microorganisms, including the fungus C. albicans. The antimicrobial activity was observed against all tested microorganisms at a very low concentration of 2-4 µg/ml of nano silver.Öğe Assessment of antibacterial activity of lining leather treated with silver doped hydroxyapatite(Elsevier Ltd, 2015) Koizhaiganova M.; Yaşa I.; Gülümser G.In this study, silver doped hydroxyapatite (Ag-HA) prepared by the microwave method was applied as the finishing agent to leather, and its antibacterial effect was investigated. The structural properties of the Ag-HA treated leather were determined using Fourier Transform Infrared Spectroscopy (FTIR) and Raman Spectroscopy. In the Raman and FTIR results, the presence of the PO43- band of HA clearly indicated the application of 0%-5% Ag-HA to the surface of the finished leathers, and xMeO (Ag2O) peaks showed that silver was present in the film on the leather surface. The antibacterial activity of the leathers were assessed by means of the parallel streak method (qualitative) and the test of percentage of microbial reduction (quantitative). According to the results of these tests, leather treated with Ag-HA containing 2% or more of silver (Ag) showed good antibacterial activity, and it was decided that Ag doped hydroxyapatite could be used as an antibacterial agent on lining leathers. © 2015 Elsevier Ltd.Öğe Assessment of antimicrobial activity of nanosized Ag doped TiO2 colloids(2012) Yaşa I.; Lkhagvajav N.; Koizhaiganova M.; Çelik E.; Sari Ö.In the present research, the antimicrobial effects of nanosized silver (Ag) doped TiO2 colloidal solutions prepared using a sol-gel technique were investigated. In order to determine the solution characteristics, the turbidity, viscosity and pH of the colloidal solutions were measured. Differential thermal analysis-thermogravimetry equipment was used to determine the chemical structures and reaction types of the films formed from these solutions. The morphology of Ag doped TiO2 nanoparticles was evaluated by atomic force microscopy. The disc diffusion method was employed to explore antimicrobial activity, and the Broth Microdilution method was used to obtain MIC values of nanosized Ag doped TiO2 colloidal solutions against the test microorganisms Escherichia coli, Staphylococcus aureus,Candida albicans, Bacillus subtilis, and Salmonella typhimurium. It was found that the silver doped TiO2 nanoparticles inhibited the growth and multiplication of the test microorganisms, including the fungus C. albicans. Antimicrobial activity was observed against all tested microorganisms at a very low concentration of 1. 125-2. 81 µg/ml of nano silver in 1-25 % Ag-TiO2 solutions. © 2012 Springer Science+Business Media B.V.Öğe Assessment of the antifungal activity of lining leather treated with silver doped hydroxyapatite(Ege Universitesi, 2015) Koizhaiganova M.; Yaşa I.; Gülümser G.In this study, silver doped hydroxyapatite (Ag-HA) prepared by the microwave method was applied to leather in the finishing composition and its antifungal effect was investigated. The surface morphology of treated leathers was observed using Scanning Electron Microscopy (SEM). The Ag content in leather samples was identified with inductively coupled plasma optical emission spectrometry (ICP-OES). The antifungal activities of the control leather and the 0%-5% Ag doped hydroxyapatite treated leather samples on the test fungi Aspergillus Niger TEM and Trichoderma viride TEM were evaluated according to ASTM D 4576-08:2008 Standard Test Method for Mold Growth Resistance of Wet-Blue Leather. According to the results of the study, the antifungal performances of the treated leather were increased by increasing the concentration of Ag in hydroxyapatite. Moreover, the leather treated with Ag doped hydroxyapatite containing 2% or more of silver showed strong antifungal activity and it was decided that Ag doped hydroxyapatite could be used as an antifungal agent on leathers.Öğe Determination of abrasion resistance of automobile upholstery leathers [Determinarea rezistentei la abraziune a pieilor pentru tapiteria automobilelor](2011) Isik N.O.; Cireli I.; Koizhaiganova M.In recent years, as a result of increasing customer demands such as natural appearance and handle, comfort, luxury and prestige, parallel to technologic improvements in automotive industry, a new trend for using leather in coating and upholstering the interior elements of autos has raised. Leathers and leather goods used in automotive sector are in the leather article group with high performance expectations. However; there has been no consensus about criteria for performance characteristics of automobile upholstery leathers, thereby, each car manufacturer wants to buy leathers according to their own requirements. It is inevitable phenomena that in progressing time material aging would cause lacking in performance and at the same time the diverse effects (but in most cases negatively) in properties and the setbacks in comfort. In particular, proceeding possible chemical decomposition depending on interior conditions of a car is of importance enabling both the lacking of material properties and decreasing the comfort of driving as well as health risks of drivers. In this study, one of the expected performance characteristics of automobile upholstery leathers-the abrasion resistance was determined by Taber Abraser.Öğe New gelatin-hydroxyapatite nanocomposite films containing nano silver: Synthesis, and, mechanical and antimicrobial properties(2011) Koizhaiganova M.; Lkhagvajav N.; Ya¸sa I.; Çelik E.A new gelatin-hydroxyapatite (GHA) nanocomposite with different amounts of nanosilver (nAg) has been obtained by a colloidal chemical route. The AFM results revealed that the particle size of nAg particles was less than 20 nm. The morphology of the prepared hydroxyapatite (HA) powder was investigated by X-ray diffraction (XRD). The nanocomposite films were characterized by FT-IR spectroscopy, showing the interaction of the GHA with nAg. Mechanical properties and antimicrobial effects against the test microorganisms, bacteria E.coli and S. aureus and fungi C. albicans, A. niger and T. viridae, were also studied. The results obtained showed that the antimicrobial effects of the nanocomposite films as well as their mechanical properties like tensile strength and elongation at break are improved by increasing the amount of nano Ag from 10 to 50 ppm. Therefore, this material is a promising biomaterial to use in food, pharmaceutical and medical applications, etc. Copyright © 2011 American Scientific Publishers.Öğe TiO2-SiO2-GLYMO nanocomposite prepared by sol-gel processing for leather finishing(International Union of Leather Technologists and Chemists Societies (IULTCS), 2015) Koizhaiganova M.; Aslan A.; Göde C.; Meyer M.TiO2 is one of the most studied due to its unique characteristics: non-Toxicity, good chemical stability, strong mechanical properties, low cost, and excellent photocatalytic performance. SiO2 has high thermal stability, excellent mechanical strength and helps to create new catalytic active sites due to interaction between TiO2 and SiO2. GLYMO (y-glycidoxypropyltrimethoxysilane) is an organically modified alkoxide, whose organic group contains an epoxide ring that can be cross-linked to form a poly(ethylene oxide) chain and acts as network former. In this work, we propose to prepare TiO2-SiO2 nanocomposite with addition of GLYMO at ambient temperature via sol-gel method. In this context, in order to reveal the characteristics, turbidity, viscosity and pH of the nanocomposite were measured. The chemical structure of the nanocomposite was evaluated by means of Fourier Transform Infrared Spectroscopy (FTIR). Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) were employed to characterize the surface properties of composite film. In summary, the TiO2-SiO2-GLYMO nanocomposite was successfully synthesized using the sol-gel method. The turbidity value of the nanocomposite was 9.93 ntu. The nanocomposite was mildly acidic with a pH value of 4.80. It was determined that the viscosity of the nanocomposite was approximately equal to 2-5 mPa.s. The particles sizes were approximately 10.5 nm. The thin and transparent coating obtained from the nanocomposite was evenly distributed. From the results obtained it was revealed that the TiO2-SiO2-GLYMO nanocomposite can be used in leather finshing.
