ZnO applications and challenges

Oprea, Ovidiu | Andronescu, Ecaterina | Ficai, Denisa | Ficai, Anton | Oktar, Faik N | Yetmez, Mehmet

Article | 2014 | Current Organic Chemistry18 ( 2 ) , pp.192 - 203

Metal oxide nanoparticles represent a new class of important materials that are increasingly being developed for use in research and health-related applications. Although the in vitro antibacterial activity of zinc oxides and some other zinc compounds has been known for quite some time, only in the last few years nanoparticles of ZnO have been investigated for their antibacterial activity, the knowledge about it remaining deficient. The antimicrobial activity of ZnO nanoparticles is strongly influenced by some factors such as size and the presence of light. The potential applications include, but are not limited to, topic drugs, cos . . .metics or component for agents that control the spread of bacterial strains (antibacterial paint in hospitals, antibacterial coatings for fabrics, antibacterial packaging for food, etc). The current review aims to present the level of knowledge accumulated on the antibacterial and antifungal activity of ZnO. © 2014 Bentham Science Publishers Daha fazlası Daha az

Sintering behavior and mechanical properties of biphasic calcium phosphate ceramics

Yetmez, Mehmet

Article | 2014 | Advances in Materials Science and Engineering2014 , pp.192 - 203

The sintering behavior and the mechanical properties of a mechanical mixture of hydroxyapatite and tricalcium phosphate (BCP) ceramics with the composition of 30% HA and 70% TCP are experimentally investigated in the temperature range between 1000°C and 1300°C. The results show that consolidation, grain growth, and Vickers hardness generally increase with increasing sintering temperature up to 1200°C. However, microstructure observation indicates that cracks are formed along the grain boundaries as well as in the bulk of the grains after sintering at 1200°C. Moreover, the best values of compressive strength, modulus of elasticity, a . . .nd toughness are achieved in the samples sintered at 1100°C. These properties at 1100°C decay with sintering at 1200°C and increase again after sintering at 1300°C. © 2014 Mehmet Yetmez Daha fazlası Daha az

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