فهرست مطالب

Journal of Physical Chemistry & Electrochemistry
Volume:4 Issue: 2, 2016

  • تاریخ انتشار: 1395/12/12
  • تعداد عناوین: 5
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  • Elham Eslami, Fatemeh Farjami Pages 111-117
    A carbon nanocomposite electrode has been designed by incorporation of montmorillonite nanoclay into the carbon ionic liquid electrode for the electrochemical determination of amitriptiline . The surface of the proposed electrode was characterized by scanning electron microscopy. The presence of ionic liquid as a binder is believed to be responsible for the electrocatalytic activity of the proposed electrode for oxidation of amitriptyline. Low detection limit of 24 nM for amitriptyline was achieved. High stability and reproducibility as well as the ease of preparation, low cost and surface renewal made this electrode ideal for the determination of amitriptyline in human body fluids.
    Keywords: Amitriptiline, Carbon ionic liquid electrode, Electrochemistry, Nanoclay
  • Farzaneh Ebrahimzadeh Pages 119-123
    Poly (N-bromosuccinimide) (PNBS) as a mild, efficient, non-acidic, polymeric and heterogeneous catalyst was applied for simple conversion of epoxides into thiiranes by treatment with KSCN or (NH2)2CS at room temperature. Aliphatic and aromatic epoxides converted into their corresponding thiiranes under mild conditions. All reactions proceeded in short reaction times and afforded the corresponding products in good to excellent yields. The catalyst could be recycled and reused for several times without any deterioration in its activity. Advantages such as easy preparation of the catalyst, simple work up, excellent yields of the products and recyclability of the catalyst makes this method more useful compared to the known methodologies.
    Keywords: polymer, catalyst, thiirane, epoxide, heterogeneous catalyst
  • Mohammad Bagher Limooei, Hadi Ebrahimifar, Shabnam Hosseini Pages 125-130
    Long–term stability and oxidation resistance of AISI 439 ferritic stainless steel used as interconnects in solid oxide fuel cells can be improved by use of a protective coating. In this study the pack cementation method was employed to coat AISI 439 ferritic stainless steel with manganese. Isothermal oxidation was conducted at 800 ºC for 200 hours in static air to investigate the role of coating against oxidation. Cyclic oxidation was also performed for up to 100 cycles at the oxidation temperature of 800 °C. Formation of manganese oxides (MnFe2O4, Mn3O4 and Mn2O3) during oxidation tests improved oxidation resistance. The coated samples demonstrated lower mass gain in each test, indicating the coating layer could have act as a mass barrier against the outward diffusion of cations specially Cr.
    Keywords: Oxidation, Solid oxide fuel cell, AISI 439 ferritic stainless steel, Manganese, Interconnect
  • P. Khorramzadeh, Nima Karachi, Seyyed Mostafa Hosseini Pages 131-135
    An analytical equation of state has been previously modified by Papari et al. for representing the volumetric properties of molecular fluids. However the performance of that EOS has not been yet well investigated for refrigerant fluids. This study extended that equation to 19 liquid refrigerants to predict their densities at isothermal and saturated states. Two temperature-independent parameters appearing in the modified EOS are closely related to critical point properties of refrigerant fluids. Our results showed that, the proposed EOS can predict well isothermal and saturated liquid destinies of studied refrigerants over the temperature and pressure range from 137-400 K and 0.001 1870 bar, with AADs equal to 2.16% and 2.66%, respectively.
    Keywords: Equation of state, Refrigerant, Liquid density
  • Hanieh Etezadi, Leila Baramakeh Pages 135-149
    In this work, Fe3O4-graphene oxide nanocomposite (GO-Fe3O4) was prepared as effective absorbent for magnetic solid phase extraction (MSPE) of trace quantities of cadmium ions in environmental water and rice samples using 1, 2-dihydroxy anthraquinone-3-sulphonic acid, sodium salt (Alizarin red S) and flame atomic absorption spectrometry (FAAS). The GO-Fe3O4 was characterized by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). Various parameters affecting GO-F 3O4 MSPE of cadmium have been investigated. Under the optimized experimental conditions, the limit of detection (LOD) for Cd2 in the range of 1-50 ngL-1 were 0.21 and the relative standard deviation (RSDs, c=50 ngL-1, n=7) were 3.2 %. The developed GO-Fe3O4 MSPE-FAAS method has the advantages of rapidity, simplicity, good sensitivity, and it is suitable for the analysis of trace cadmium in samples with complex matrix.
    Keywords: Graphene oxide, Fe3O4, nanocomposite, magnetic solid phase extraction, Alizarin red S, cadmium, rice, water sample