Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Publisher: search.filters.publisher.Izmir Institute of TechnologySubject: search.filters.subject.Antibacterial agents

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  • Master Thesis
    Development of Antibacterial Polymer Based Nanocomposite Materials
    (Izmir Institute of Technology, 2015) Abatay, Ezgi; Tanoğlu, Metin; Arslanoğlu, Alper; Arslanoğlu, Alper; Tanoğlu, Metin; 03.10. Department of Mechanical Engineering; 04.03. Department of Molecular Biology and Genetics; 03. Faculty of Engineering; 04. Faculty of Science; 01. Izmir Institute of Technology
    Human beings are often infected by microorganisms such as bacterium, mold, yeast, virus, etc. in the living environment. It became a requirement and a necessity to create sterile fields in areas. Composite stones are one of the main materials that can be used for the contact surfaces in indoor and outdoor places due to their being of highly resistant to abrasives, chemicals and impacts. Research has been intensive in antibacterial material containing various inorganic substances. The aim of this thesis is investigating the antibacterial effect of inorganic substances such as silver, zinc oxide, calcium oxide, titanium oxide and magnesium oxide on stone products. This study also deals with the silver doped zinc oxide powder and their antibacterial efficacies. Stone product is formed of mainly two type compound which are quartz aggregates as reinforced and filler and thermoset polyester resin as matrix. The manufacturing process begins with selection of raw quartz materials. They are crushed and blended in the ratio of 90 % quartz aggregates to 10% polyester matrix and other additives such as antibacterial agent, pigment. These united constituents are used for production of composite stones by applying those combined vacuum, vibration and pressing processes which are named as vibropress, simultaneously. Following it, they are subjected to surface preparation and polishing processes. In this study, mechanical, thermal, and morphological properties of the particles, polyester matrix and stone product were investigated. Antibacterial efficacies of these were investigated based on colony-count method against gram negative (E.coli) and gram positive (Bacillus subtilis) bacteria. Silver-containing stone samples showed best antibacterial property about ninety-nine percent reduction.
  • Master Thesis
    Effects of Chloride Ion and the Types of Oxides on the Antibacterial Activities of Inorganic Oxide Supported Ag Materials
    (Izmir Institute of Technology, 2007) Tunçer, Mert; Şeker, Erol; Şeker, Erol; 03.02. Department of Chemical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    This study deals with the silver containing oxide supported materials and their antibacterial efficacies. Major goal of this study is to prepare silver chloride nano crystals on oxide supports to provide a long.lasting protection due to the slow and controlled release of silver ions from the materials. Two oxide supports, titanium dioxide and zinc oxide . silica matrices were synthesized via a sol-gel route which allows one to easily tailor textural and chemical properties. Two approaches were followed to form AgCl containing materials; to synthesize AgCl containing materials in a single step sol . gel route and to form AgCl in the materials by HCl treatment of metallic Ag containing oxide materials. The characterization of the samples were performed by using XRD, SEM, and BET techniques. Antibacterial efficacies of the powders were investigated by disk diffusion (zone inhibition) method against Gram negative E. coli bacteria. In the antibacterial activity tests, the powders containing metallic Ag and/or AgCl nano crystals were compared with the repeated usage to study the feasibility of their long term protection. In this study, it was found that AgCl nano-crytals containing samples showed a larger zone of inhibition than Ag containing samples in the standard media whose ingredient.s inhibitory effect on the antibacterial activity is the lowest. However, in the high broth containing media, metallic Ag nano-crystals containing samples showed higher zone of inhibition than AgCl containing samples which reveals the dependence of antibacterial activity on the type of media. In ZnO . SiO2 samples, the highest antibacterial activity was found unexpectedly at the lowest ZnO concentration. Moreover, Ag containing ZnO . SiO2 was found to be more active than Ag containing TiO2 samples. As the antibacterial tested samples were investigated by XRD, it was seen that Ag crystals were formed into AgCl crystal because of the Cl ions present in the broth media. AgCl formation indicates that there is an interaction between the content of growth media and the antibacterial materials.