Cengiz Kaya - Academia.edu (original) (raw)

Papers by Cengiz Kaya

Journal of Clean Energy Technologies, 2013

Disinfection process by chlorine has been applying effectively in drinking water treatment proces... more Disinfection process by chlorine has been applying effectively in drinking water treatment processes; nevertheless it causes the formation of THMs which are thought to be carcinogen. Restrictions of THMs had been imposed by organizations in most of the countries. In Istanbul, these limit values were not exceeded in present time, but organic content of drinking water supplies is accreted by the increment pollution on occasion of population growth. This will lead to investigate and apply an extra treatment unit for THM removals. In this study, application of nanoparticle was researched in THM removal from tap water. Nanoparticle used in the process was sintered into zeolite in coin form. The results were promising. It was observed that unsintered form was more effective on removal of THMs than sintered form of α-Fe 2 O 3. Furthermore, nanoparticles in zeolite form advanced the adsorption capacity of zeolite.

Materials Discovery, 2017

Pure TiO2, Ag-containing TiO2 and B-containing TiO2 nanoparticles and nanotubes were synthesized ... more Pure TiO2, Ag-containing TiO2 and B-containing TiO2 nanoparticles and nanotubes were synthesized using hydrothermal and sol-gel procedures as shown in the figure. As a boron precursor, very reactive amorphous B was used instead of boron oxide which is typically the most preferred in literature. All nanoparticles and nanotubes were investigated using a number of characterization methods. SEM and TEM analyses were helpful in order to understand the nanostructures in detail, whereas XRD was used to determine all of the phases present. An antimicrobial efficiency of the nanostructures MTT test was carried out against leishmanias. It was proven that doping both TiO2 nanoparticles and nanotubes with Ag and B-, increase their antileishmanial effect.

Materials

In this study, boron carbide powders consisting mainly of nano/micro fibers or polyhedral-equiaxe... more In this study, boron carbide powders consisting mainly of nano/micro fibers or polyhedral-equiaxed particles were synthesized via the sol–gel technique, and the influence of particle morphology on electrochemical performance of boron carbide electrodes was investigated. Thermal decomposition duration of the precursors played a determinant role in the final morphology of the synthesized boron carbide powders. The morphology of boron carbide powders successfully tuned from polyhedral-equiaxed (with ~3 µm average particle size) to nano/micro fibers by adjusting the thermal decomposition duration of precursors. The length and thickness of fibers were in the range of 30 to 200 µm and sub-micron to 5 µm, respectively. The electrochemical performance analysis of boron carbide powders has shown that the particle morphology has a considerable impact on the boron carbide electrodes electrochemical performance. It was found that the synergetic effects of polyhedral-equiaxed and nano/micro fibe...

SN Applied Sciences

Antimicrobial ɑ-Fe 2 O 3 nanoparticles were synthesized using hydrothermal method (HS) at 150 °C ... more Antimicrobial ɑ-Fe 2 O 3 nanoparticles were synthesized using hydrothermal method (HS) at 150 °C for 12 h. FeCl 3 and urea were used to have ɑ-Fe 2 O 3 nanostructures with the help of appropriate amount of surfactants to control the morphology. Stable colloidal suspensions were prepared using synthesized nanoparticles and then 3-D metallic filters were coated using electrophoretic deposition under definite voltage and time. It was shown that the obtained particles were effective to eliminate S. Aureus Bacterias.

Journal of the European Ceramic Society, 2004

... The water-based paste was prepared using a very fine boehmite powder (Pural SB, Condea Chemie... more ... The water-based paste was prepared using a very fine boehmite powder (Pural SB, Condea Chemie GmbH, Germany) with an average particle size of 50 nm and a cellulose ether based binder (Methocel K15M, Dow Deutschland Inc., Germany). ...

Ceramics International, 2002

ABSTRACT

British Ceramic Transactions, 1998

KRENKEL:HIGH.TEMP.CERAMIC O-BK, 2001

ABSTRACT SummaryA combined processing technique comprising in-situ electrophoretic deposition (EP... more ABSTRACT SummaryA combined processing technique comprising in-situ electrophoretic deposition (EPD) and pressure filtration (PF) was applied in order to produce mullite fibre-reinforced porous mullite composites suitable for high temperature applications. Hydrothermally synthesised sinter-active (monophasic) mullite+5 wt% zirconia powders were used as starting materials for the matrix. Woven Nextel™ 720 mullite fibres were coated with laboratory prepared NdPO4 using dip-coating. Coated fibre mats were then used in an in-situ EPD cell as the deposition electrode in order to infiltrate the very tight inter/intra fibre tow regions with the nano-size mullite particles. Finally, eight layers of infiltrated fibre preforms were placed in a high load pressure filtration assembly, leading to formation of consolidated compacts with high green densities. After sintering at 1200°C for 3 h, the compacts had a density of 86.4 % of theoretical density and showed damage-tolerant behaviour up to 1300 °C with 4-point bend strengths values of 235 MPa and 230 MPa at room and 1300 °C, respectively.

Journal of Materials Science Letters, 1997

Abstracts are not published in this journal

Key Engineering Materials, 2008

A combined technique comprising electrophoretic deposition (EPD) and low-pressure infiltration wa... more A combined technique comprising electrophoretic deposition (EPD) and low-pressure infiltration was used for the fabrication of multi-layer woven mullite ceramic fabric reinforced alumina ceramic matrix composites (CMCs) for high temperature applications. Two different interface materials, NdPO4 and ZrO2 were synthesised and used for coating the woven ceramic fibres by EPD. The manufactured CMC components with suitable interface material are targeted for use at 1300-1400 oC in an oxidising atmosphere and have shown very good mechanical properties in multi-layer plate forms. Damage mechanisms, such as debonding, fibre fracture, delamination and matrix cracking within the composite plates subjected to flexural loading are analysed. It is shown that the composites with NdPO4 interface and 40 vol.% fibre loading have better mechanical properties in terms of strength and damage-tolerant behaviour. The final components produced are considered to be suitable for use as shroud seals and insu...

MRS Proceedings, 2001

ABSTRACTBy reinforcing glass and glass-ceramic matrices with ceramic or metallic fibres, advanced... more ABSTRACTBy reinforcing glass and glass-ceramic matrices with ceramic or metallic fibres, advanced composite materials with improved mechanical properties can be fabricated. These composites were originally developed as model systems for laboratory-scale experiments. Due to their remarkable thermomechanical properties, however, the materials are candidate for a variety of technical applications. The present contribution is based on an extensive review of the available literature on these materials, accumulated in the last 30 years, focusing on manufacturing techniques. The literature analysis reveals that several challenges related to the composites fabrication remain for future developments. In particular, it is shown that relative limited R&D work has been carried out so far in the area of manufacturing of engineering components and structures having complex geometry and large dimensions. The application of electrophoretic deposition techniques in order to manufacture three-dimensi...

Key Engineering Materials, 2010