Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 11 4 2018 11 01 Epoxy Coatings Physically Cured with Hydroxyl-contained Silica Nanospheres and Halloysite nanotubes 199 207 76672 10.30509/pccc.2018.76672 EN M. Jouyandeh Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box: 81746-73441, Isfahan, Iran. O. Moini Jazani Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box: 81746-73441, Isfahan, Iran. A.H. Navarchian Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box: 81746-73441, Isfahan, Iran. M.R. Saeb Department of Resin and Additives, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran. Journal Article 2018 07 18 Epoxy coatings are usually reinforced by the use of nanofillers, but reactive nanofillers having physical tendency towards epoxide ring opening are preferable. In this work, nanosilica (SiO2) and halloysite nanotubes (HNTs) known for their hydroxyl-contained surface are used and their effects on the curing behavior of an epoxy/amine coating is compared. The spherical and tubular nanoparticles used in epoxy led to somewhat different crosslinking. Epoxy/amine systems containing equivalent amount of silica spherical and halloysite nanotube particles were compared for their cure characteristics, i.e. temperatures of starting and ending of curing reaction (TONSET and TENDSET), the exothermal peak temperature (Tp), the temperature range among which curing reaction was completed (∆T= TENDSET - TONSET) and the total heat of curing reaction (∆H). Fourier-transform infrared spectrophotometry and scanning electron microscopy analyses were used to assess formation of SiO2. Nonisothermal differential scanning calorimetry was performed at different heating rates and cure characteristics together with values of glass transition temperature of two kinds of systems containing SiO2 and HNTs were calculated, where both nanofillers revealed accelerating role in epoxy curing reaction.

https://pccc.icrc.ac.ir/article_76672_6e0b6668889394d04aba93b66174d98c.pdf

Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 11 4 2018 11 01 Synthesis, Characterization and Investigation of Photocatalytic Activity of transition metal-doped TiO2 Nanostructures 209 220 76671 10.30509/pccc.2018.76671 EN M. Hosseini-Zori Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran. Z. Mokhtari Shourijeh Department of Environmental Research, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran. Journal Article 2018 07 13 In this work, M-doped TiO2 nanostructures (M: Fe, Co and Ni) were synthesized by reverse microemulsion method. The as-prepared products were analyzed by different techniques such as scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). The effect of various dopants (Fe, Co and Ni) on band gap and photocatalytic properties of TiO2 was investigated. The decolorization abilities of the as-prepared M-TiO2 nanostructures (M = Fe, Co and Ni) under UV and visible irradiation were investigated using three dyes: Acid Red 1, Reactive Blue 21 and Indigo Carmine. The role of pH value and reaction time on photocatalytic performance of products was also studied. The results showed that the degradation of dyes in lower pH is more and photocatalytic performance Fe-doped TiO2 is better than the others. Kinetic investigation of the photodegradation illustrated reactions were following the Langmuir-Hinshelwood mechanism.

https://pccc.icrc.ac.ir/article_76671_1c0c8cf13f3a69c0017709447834a310.pdf

Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 11 4 2018 11 01 Synthesis of Fe-Doped Titanite and Quasi-Titanite Structures and Studying the Effect of Doping on Physical and Optical Properties 221 231 76670 10.30509/pccc.2018.76670 EN S.Y. Vaselnia Nano Pigments and Coatings Laboratory, Department of Physics, Yazd University, P.O. Box: 89195-741, Yazd, Iran. M. Khajeh Aminian Nano Pigments and Coatings Laboratory, Department of Physics, Yazd University, P.O. Box: 89195-741, Yazd, Iran. R. Dehghan Banadaki Color and Paint Laboratory, Eefa Ceram Company, P.O. Box: 89551-65833, Yazd, Iran Journal Article 2018 09 03 Fe-doped titanite (TiCaSiO5) and quasi-titanite (Ti0.5CaSi1.5O5) compositions were synthesized by the ceramic method. For each structure, two samples with 0.1 mol% and 0.2 mol% Fe were used. The synthesized samples were homogenized using a planetary ball mill in 2-ethylhexyl stearate solvent and then printed on the ceramic with screen printing system. The samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), dynamic light scattering (DLS), UV-Vis spectroscopy and CIE L*a*b*colorimetry methods. XRD results showed that more iron has entered to the titanite structure relative to the quasi-titanite structure with different crystal parameters. The SEM images of the powder and the printed ceramic as well as DLS results showed that the particle size of the quasi-titanite structure is smaller than that of titanite structure. The results of colorimetry and reflection spectra showed that the color of the synthesized quasi-titanite structure was beige and yellowish beige while that of titanite structure was beige and brown beige, according to the RAL color system.

https://pccc.icrc.ac.ir/article_76670_e8403150d1373c46a06a4c191cff6695.pdf

Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 11 4 2018 11 01 Scratch Resistance of Paints Degraded by Arid Saharan Environments 233 240 80027 10.30509/pccc.2018.80027 EN Z. Madaoui Department of Mechanical Engineering, Institute for Technology, Hassiba Benbouali University, City Essalem, Chlef, Algeria M. Mendas Department of Mechanical Engineering, Institute for Technology, Hassiba Benbouali University, City Essalem, Chlef, Algeria H. Zahloul Department of Mechanical Engineering, Institute for Technology, Hassiba Benbouali University, City Essalem, Chlef, Algeria S. Benayoun Laboratory of Tribology and Systems Dynamics (LTDS), Ecully, Department of Mechanical Engineering, Institute for Technology, Lyon, France Journal Article 2018 12 09 In the vast Algerian Sahara, the climate is typically desert, characterized by heat and dryness all year, which contributes to a very pronounced aridity. The aim of this study is to investigate the impact of this arid environment on automotive paints. Four paint samples with different durations of use were tested. Initially, a visualization of the surface condition by optical microscopy and microhardness tests was used. Then, microscratch tests with a progressive loading at a constant sliding speed were carried out to determine the adhesion of the paints. The obtained scratches were analyzed by scanning electron microscopy (SEM). The results show that the microhardness and microscratching resistance of the paints increased to maximum values corresponding to duration of five years. Beyond this duration, an inverse tendency of these characteristics was observed. Compared to the three years sample, the microscratch of this one leads to damage without the delamination of the paint.

https://pccc.icrc.ac.ir/article_80027_9716b4dd3095f928642c833467cc1a46.pdf

Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 11 4 2018 11 01 Synthesis and Investigation on Viscoelastic Properties of Urethane Acrylate- Polyaniline 241 252 80275 10.30509/pccc.2018.80275 EN J. Mohammadian Department of Chemical Engineering, Abadan Branch, Islamic Azad University, Abadan, Iran B. Shirkavand Hadavand Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran S. Khajenoori Department of Chemistry, Payame Noor University, Tehran, Iran Journal Article 2018 12 16 The aim of this research is to investigate the viscoelastic behavior and determination of cross-link density of thin conductive coatings of urethane acrylate-polyaniline. For this purpose, polyaniline and urethane acrylate resin were synthesized. Nanocomposites with different percentages of polyaniline (1, 3, and 5%) were prepared and cured by ultraviolet irradiation. The viscoelastic properties of prepared thin films were evaluated by dynamic mechanical thermal analysis under stresses with a certain frequency at different temperatures. Also, cross-link density of nanocomposites was measured after ultraviolet curing. The results indicated that the glass transition temperature decreases and the cross-link density increases with the amount of polyaniline.

https://pccc.icrc.ac.ir/article_80275_7af67113caab3fc8ececa500e5fdc465.pdf

Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 11 4 2018 11 01 Investigation of Photovoltaic Properties of 1,8-Naphthalimide Dyes in Dye-sensitized Solar Cells 253 258 80276 10.30509/pccc.2018.80276 EN M. Hosseinnezhad Department of Organic Colorants, Institute for Color Science and Technology, P.O. Box 16656118481, Tehran, Iran Center of Excellence for Color Science and Technology, Institute for Color Science and Technology, P.O. Box 16656118481, Tehran, Iran H. Shaki Department of Chemical Engineering, Golestan University, P. O. Box: 49138 – 15759, Gorgan, Iran. Journal Article 2018 12 16 In this paper we selected two metal-free dyes (Dye 1 and Dye 2) based on 1,8-naphthalimide. The proposed dyes were sensitized from acenaphthene as the starting material by standard reactions. Spectrophotometric measurements of the organic dyes in DMF and on TiO2 substrate were carried out in order to assess changes in the status of the dyes. Maximum absorption wavelengths for Dye 1 and Dye 2 in solution are 427 nm and 434 nm and on TiO2 films are 451 nm and 455 nm, respectively. Finally, the proposed dyes were used as sensitizer in a home-made dye solar cell structure and their photovoltaic properties were investigated. The conversion efficiency for Dye 1 and Dye 2 are 1.19 % and 1.34 %, respectively.

https://pccc.icrc.ac.ir/article_80276_f8c8d5379272d2b854edb748346e4060.pdf