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1
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Fabrication and Investigation of the Charge/Discharge Characteristics of Zinc/PVA-KOH/Carbon Cell

100%
Saleem M., Sayyad M., Karimov K., Ahmad Z.
Acta Physica Polonica A
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2009
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vol. 116
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issue 6
1021-1024
EN
Electrochemical properties of a zinc/polyvinyl alcohol-potassium hydroxide/carbon cell have been investigated. In this cell, PVA-KOH gel has been used as an electrolyte with PVA/KOH wt.% ratio of 60:40, while zinc and carbon rods served as electrodes. The cylindrical glass vessel of length 3.0 cm and of diameter 2.0 cm has been used as a cell compartment. The current-voltage characteristics and open circuit voltage-time, charge voltage/current-time and discharge voltage/current-time studies have been done. The open circuit voltage has been observed for 160 h. It has been found that the cell shows stability and is rechargeable, too.
2
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Basic Electrochemical Behavior of Ti-7Cu Alloys for Medical Applications

100%
Tsao L.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
561-564
EN
The aim of this study was to investigate the effects of two different treatments, as-cast setup and solution heat treatment, on the general electrochemical corrosion resistance of Ti-7Cu alloy samples immersed in a 0.9 wt% NaCl solution at 25°C. The microstructure was examined by scanning electron microscopy and X-ray diffractometry. Corrosion behavior was tested by potentiodynamic polarization curves. Finer α' martensite and Ti_2Cu intermetallic particles were provided by casting and heat treated processes, respectively. The results indicated that only corrosion potential is significantly more noble in the heat treated sample, but other characteristics are only slightly different.
3
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Electrochemical Behaviour of V_{2}O_{5} Xerogel and V_{2}O_{5} Xerogel/C Composite in an Aqueous LiNO_{3} and Mg(NO_{3})_{2} Solutions

88%
Stojković I., Cvjetićanin N., Marković S., Mitrić M., Mentus S.
Acta Physica Polonica A
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2010
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vol. 117
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issue 5
837-840
EN
We synthesized both the V_{2}O_{5} xerogel and the composite V_{2}O_{5} xerogel/C starting from the solution of V_{2}O_{5} in hydrogen peroxide. After the characterization by XRD, thermal (TGA-DTA), SEM methods and by particle size analysis, the investigation of Li^{+} and Mg^{2+} intercalation/deintercalation reactions in an aqueous solutions of LiNO_{3} and Mg(NO_{3})_{2} were performed by cyclic voltammetry. The composite material V_{2}O_{5} xerogel/C displayed relatively high intercalation capacity, amounting to 123 mA h g^{-1} and 107 mA h g^{-1}, in lithium and magnesium salt solutions, respectively.
4
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Gas Sensing Properties of Carbon Nanotubes Modified with Calixarene Molecules Measured by QCM Techniques

75%
Mermer Ö., Okur S., Sümer F., Özbek C., Sayın S., Yılmaz M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
240-242
EN
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.
5
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Odor Adsorption Kinetics on Modified Textile Materials Using Quartz Microbalance Technique

75%
Sarıışık M., Okur S., Asma Ş.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
243-246
EN
In this study, a functional product with aromatic oil and vitamins for use at aromatherapy and spa centers or personal care has been designed to improve life quality of users by using multifunctional products with good odor, moisturizing, relaxation, anti-aging effects. For this purpose, commercial berry berry oil was capsulated in β-cyclodextrin, and then applied to 100% cotton towel fabric. Quartz crystal microbalance sensors were used to investigate odor adsorption kinetics on modified textile materials for the first time. The frequency responses vs. time plot shows clear linear step responses to the change in the concentration of odor molecules coming from the container filled with berry berry applied textile. The results also reveal that TiO_2 coated quartz crystal microbalance sensors can be used as e-nose to sense odor from textile coated with berry berry oil containing β-cyclodextrin capsules.
6
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Electrical Characterization of Interdigitated Humidity Sensors Based on CNT Modified Calixarene Molecules

75%
Özbek C., Culcular E., Okur S., Yılmaz M., Kurt M.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
461-463
EN
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.
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