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    Wyświetlanie 1-5 z 5
    Tytuł:
    Electrical Characterization of Interdigitated Humidity Sensors Based on CNT Modified Calixarene Molecules
    Autorzy:
    Özbek, C.
    Culcular, E.
    Okur, S.
    Yılmaz, M.
    Kurt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400035.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    66.30.je
    65.40.gp
    65.40.gk
    65.40.gd
    64.70.fm
    64.10.+h
    51.10.+y
    Opis:
    In this study, we report on the optimization and characterization of chloroform soluble calix[4]arene derivative as a humidity sensor based on electrical properties. Due to the fact that calix[4]arene molecules are nonconductive, we modified the calix[4]arene molecules with carbon nanotubes with electrostatic bond in order to increase the conductance of calix[4]arene molecule (5,11,17,23-tetra-ter-butyl-25,27-dehydrazinamidcarbonilmetoxy-26,28-dehydroxy-kalix[4]aren). Using photolithography technique, we fabricated interdigitated gold electrodes with 3 micrometers separation to investigate the electrical properties of carbon nanotubes modified calix[4]arene molecule where we used dropcast method to form a thin film of carbon nanotubes modified calix[4]arene molecule on the gold electrodes. Our reproducible experimental results indicated that the chloroform soluble carbon nanotubes modified calix[4]arene films have great potential for humidity sensing applications at room temperature operations.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 461-463
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gas Sensing Properties of Carbon Nanotubes Modified with Calixarene Molecules Measured by QCM Techniques
    Autorzy:
    Mermer, Ö.
    Okur, S.
    Sümer, F.
    Özbek, C.
    Sayın, S.
    Yılmaz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491414.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    66.30.je
    65.40.gp
    65.40.gk
    65.40.gd
    64.70.fm
    64.10.+h
    51.10.+y
    Opis:
    This study focuses on the characterization and optimization of calixarene modified carbon nanotube thin films for gas detection. Calixarene molecules were synthesized individually by considering their functional groups to attract the gas. Calixarene modified carbon nanotube based sensors were fabricated using drop-casting method on a quartz crystal microbalance gold electrode. Carbon monoxide, carbondioxide, oxygen and dry air were used as active gases for adsorption process, while high-purity nitrogen gas was used for desorption process. The selectivity and sensitivity of calixarene modified carbon nanotube are investigated in detail. Our experimental results show that functional calixarene modified carbon nanotube coated quartz crystal microbalance sensors are very sensitive and selective to gas of $CO_2$ at room temperature operation.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 240-242
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear Behavior of DIN 1.2210 Steel Modified by a Pulse Plasma Technique
    Autorzy:
    Özbek, Y.
    Gökkaya, T.
    Yavaşcan, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398727.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Fg
    Opis:
    The microstructure and wear properties of pulse plasma treated AISI 4140 steel was investigated. The surface properties of the materials have been improved by modifying the surfaces of the DIN 1.2210 steel with pulse plasma technique. The sample surfaces have been modified by pulse plasma with C₃H₈, nitrogen and O₂ gases. Two different distances between the sample and nozzle and three different numbers of pulse were determined for modification process and the surface process was implemented by using tungsten electrode with 800 µF battery capacity. The optical images were taken of the materials which the surfaces were improved by using pulse plasma technique. The surface modified samples were subjected to X-ray diffraction analysis. Wear tests were performed in a linear wear test machine with 0.15 m/s constant sliding speed under 5 N loads for 200 m sliding distance. The wear rate was changed in accordance with process parameters. The wear resistance increased in the surface modified specimens was compared to that of non-modified ones. Worn surfaces of specimens were studied by scanning electron microscope and energy dispersive spectroscopy analyses techniques. It is determined that the thickness of modification layer changes regarding to the amount of new phases and sample-nozzle distance. It is approved the increase on wear resistance related to wolfram diffusion.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 588-591
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Web-Based Virtual Experiment in Material Science: Tensile Test Laboratory Application
    Autorzy:
    Kiraz, A.
    Kubat, C.
    Özbek, Y.
    Uygun, Ö.
    Eski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182894.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.10.Lw
    Opis:
    Virtual laboratories have a very important place for distant education which has real applications of laboratory tests and experiment applications. It is fact that virtual laboratories necessity is inevitable because of the requirements of materials, place, staff and above all, time and financial requirements for establishment of real laboratories. The main concept of virtual laboratory is to replace real machines with their virtual simulations. Real investigative equipment is not often available for students, researchers, and practitioners as users in addition to their expensive costs in usage. Virtual laboratories are cheap and safe in use because all mistakes can be easily erased by web-based application or simulation reset without any consequences. Furthermore users can easily make many tests regardless of place in any time on the web. In this study AISI 4140 steel was used, since AISI 4140 steel is the most well-known type of steel used in industries. Tensile test of the steel was examined regarding to different tensile speeds. The study aimed to design the web-based virtual tensile test laboratory. The uniqueness of this study is generating an artificial neural network model by using the values of the material which is stressed in different speeds. Thanks to this model, intermediate speed values were predicted. Besides that, this model was used to design web-based virtual tensile test laboratory application. With the help of this application, users can easily realize the yield strength, ultimate strength and fracture strength on stress-strain diagram.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 310-312
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Evaluation of Cu-B₄C Composites Manufactured by Powder Metallurgy
    Autorzy:
    Yener, T.
    Altinsoy, I.
    Yener, S.
    Celebi Efe, G.
    Ozbek, I.
    Bindal, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401279.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    81.20.Ev
    72.80.Tm
    Opis:
    In this study, the influences of B₄C ratios on some mechanical and physical properties such as relative density, microhardness and electrical properties of cold pressed Cu-B₄C composites were investigated. Curve fitting is applied for the estimation of electrical conductivity. Commercial copper powders with 40 μm particle size were reinforced with B₄C, with particle size of 40 μm, at ratios of 1, 2, 3 wt.%, for improving mechanical properties of copper used as electrical conductor. Cu-B₄C composites have been fabricated by powder sintering process at a temperature of 900°C for 2 h. The presence of Cu and B₄C, which are dominant components in the sintered composites, were confirmed by X-ray diffraction analysis technique and SEM-EDS. Scanning electron microscope (SEM-EDS) has shown that B₄C particles are distributed homogenously in the copper matrix. The relative densities of Cu and Cu-B₄C composites, sintered at 900°C, ranged from 95.7 to 91.6%. Microhardness of composites ranged from 84.5 to 94.6 HB. It was observed that cold pressed Cu-1 wt.% B₄C composites revealed promising physical properties. Results of electrical conductivity measurement of Cu-B₄C composite material are compared to the results of the model and the overall accuracy level above 96% is obtained.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1045-1047
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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