فهرست مطالب

Progress in Color, Colorants and Coatings - Volume:13 Issue:3, 2020
  • Volume:13 Issue:3, 2020
  • تاریخ انتشار: 1398/10/24
  • تعداد عناوین: 6
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  • R. N. Abed *, N. K. Al Sahib, A. J. N. Khalifa Pages 143-154

    Novel method doped carbon with nanoparticle Cr2O3 and thin film has been studied in much thought in wavelength range, the doping can help new excellent physical and chemical properties for carbon, this application has a semiconductor feature. Nanocomposite thin film deposited on copper and glass substrates have been created by utilizing Spray Pyrolysis method. The precursor solution for the nanocomposite (Cr2O3/C) was blended with the polyethylene glycol as a colloidal. The optical band gap is a crucial property for the nanocomposite, for instance, nanocomposite thin film of Cr2O3/C was kept by shower process on glass and copper substrates. The band gap for the nanocomposite photo-catalytic has been finished using X-ray diffraction, UV-Vis spectrometer. The assessed optical band gaps for direct and indirect transition values determined and were 3.5, 3.25 eV and photon energy 1.65 eV to carbon doped by nanoparticle Cr2O3. Thin film thickness ranging between 45-160 µm This paper achieved the doped carbon by nanoparticles of Cr2O3 for thin layer coating in flat plate collector. New coating activity may be given by novel nanocomposite Cr2O3/C structure as a semiconductor. Results showed a new nanocomposite to enhance the absorption of the solar energy light activity.This paper achieved the doped carbon by nanoparticles of Cr2O3 for thin layer coating in flat plate collector. New coating activity may additionally be given via novel Nanocomposite Cr2O3/C structure as a semiconductor. Results showed a new Nanocomposite to enhance the absorption of solar energy light activity.

    Keywords: characterization of catalyst, spray pyrolysis coating, semiconductor synthesis, XRD measurements, FT-IR measurements
  • F. Abdollahi, M. M. Foroughi, M. Shahidi Zandi *, M. Kazemipour Pages 155-165
    Inhibition effects of meloxicam drug on mild steel corrosion in 1 M HCl and 0.5 M H2SO4 solutions have been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The inhibition efficiency (IE) was found to increase with increasing the inhibitor concentration in HCl solution. However, the IE was increased in H2SO4 solution with increasing the meloxicam concentration up to 200 ppm and then it was decreased. Maximum inhibition efficiency of 92 and 95% has been achieved at 400 and 200 ppm meloxicam in 1M HCl and 0.5M H2SO4, respectively. Adsorption of meloxicam on the surface of mild steel follows Langmuir isotherm. Potentiodynamic polarization measurements indicated that meloxicam is a mixed-type inhibitor. The effect of temperature on the corrosion rate of mild steel was studied in acidic media both in the absence and presence of meloxicam drug. Some thermodynamic parameters were computed from the effect of temperature on the inhibition process.
    Keywords: Meloxicam, Environment-friendly inhibitor, electrochemical impedance spectroscopy, Potentiodynamic, polarization, Mild steel
  • F. Tahmasb Pour Afshar, N. Ramezanian *, M. Behzadpour Pages 167-175
    The main purpose of this study was to investigate the effects of different types and concentrations of mineral extenders on some major properties of long oil alkyd paint with the main pigment of titanium dioxide (TiO2). To this end, a fraction of TiO2 was replaced with extenders including kaolinite, talc, dolomite, and barite. Moreover, adhesion, bending test, and coating quality were measured once the given extenders were added to the formulation. The results revealed that adding these extenders to the formula had led to no significant changes in adhesion, bending test, as well as coating quality. In addition, drying time, reflection, total solvent used, milling time, and hiding power were considered as some parameters monitored during the use of different types of extenders. The findings also confirmed that replacing 5 and 7 wt.% of TiO2 with different extenders could have an adverse effect on reflection and hiding power. However, milling time and total solvent used had increased. Moreover, samples such as kaolinite + calcium carbonate (CaCO3) (H-1), kaolinite + talc (H-2) and kaolinite + nano clay (NC) (H-3) were prepared to investigate the effect of hybrid extender content on major properties of the paint. The results revealed that milling time and solvent weight had augmented and the paint including kaolinite + NC (H-3) showed the highest level of milling time (420 min) and solvent weight (63.9 g) among others. However, drying time and reflection did not show any significant difference. In addition, the findings confirmed the positive effect of the hybrid extender system on abrasion properties of the long oil alkyd paint.
    Keywords: Alkyd Paint, pigment, Extender, Titanium dioxide, Kaolinite
  • M. Hosseinnezhad *, M. Ghahari, H. Shaki, J. Movahedi Pages 177-185
    In this paper, we selected three organic dyes based on 1,8-naphthalimide as photosensitizers for DSSCs preparation. The organic dyes were sensitized from acenaphthene as the starting material by standard reactions. Na-doped TiO2 was prepared via one step hydrothermal method for preparation of dye-sensitized solar cells. Spectrophotometric measurements of the organic photosensitizers in DMF and on Na-doped TiO2 substrate were carried out in order to study their maximum absorption wavelength. The maximum absorption wavelength for Dyes 1, 2 and 3 in DMF are 427, 434 and 435 nm and on TiO2 films are 442, 446 and 446 nm, respectively. Finally, the proposed dyes were used as photosensitizer in a dye solar cell structure in the presence of Na-doped TiO2 and their photovoltaic properties were investigated. The conversion efficiencies for the synthesized Dyes 1, 2 and 3 are 1.09%, 1.37% and 1.32%, respectively.
    Keywords: Dye-sensitized solar cells, Organic photosensitizer, Photovoltaic materials, Power conversion efficiencies, Na doped TiO2
  • R. Jafari *, M. Safi Pages 187-197
    There are many factors affecting the tolerance values of instrumentally measured color differences, including variety of industries, type of products to be matched with the original samples, the need of customers, etc. Regarding the insufficiency of various color difference formulae to deal with the acceptability of color matching of reproduced samples with the target, some researchers tried to present an instrumental color tolerance limit in accordance with the results of visual assessment experiments. Considering the specific colorimetric attributes of achromatic samples (with low lightness and chroma values), it was tried to set an instrumental tolerance limit based on the measured and visually perceived color differences between 20 filament black yarns and the reference one. The results showed that determining the color tolerance value based on various color difference formulae, i.e. ΔEa*b*, CIE94, CIE2000 and CMC (2:1), results in different instrumental wrong decisions, while the ΔE*ab color difference equation with the color tolerance value of 0.5 for filament black yarns showed the minimum number of wrong decisions.
    Keywords: Color difference, black yarn, tolerance limit, Visual assessment
  • N. Khorrammaslack, S. M. Seyedahmadian, Kh. Farhadi * Pages 199-212
    The inhibitory behavior of Ponceau 4 R (an important industrial food dye) on the corrosion of copper surface in 3.5% NaCl solution was studied using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and Fourier transform infrared (FT-IR) spectroscopy. Polarization curves indicated that the self-assembled monolayer of Ponceau 4 R acts as a mixed inhibitor. The adsorption of inhibitors was well fitted to the Langmuir isotherm and the thermodynamic parameters (Kads, ∆G0) were also calculated and discussed. The inhibition efficiency of ponceau 4 R film reached 99.5% under optimized conditions and the standard Gibbs energy of 31.1 kJ/mol indicated that the adsorption mechanism of the self-assembled monolayer of Ponceau 4 R on copper was a mixed mode of physical and chemical adsorption. The obtained results revealed that other food dyes containing functional groups such as hydroxyl, sulfonyl, aromatic rings and especially azo groups can act as green inhibitor for corrosion of copper in neutral sodium chloride solutions.
    Keywords: Ponceau 4 R, Self assembled monolayers, Copper, electrochemical impedance spectroscopy, Inhibitor