Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21348420151101Application of azo dye as sensitizer in dye-sensitized solar cells2592657586410.30509/pccc.2015.75864ENSh.RouhaniCenter of Excellence for Color Science and Technology,Department of Organic Colorants, Institute of Color Science and TechnologyM.HosseinnezhadCenter of Excellence for Color Science and Technology,Department of Organic Colorants, Institute for Color Science and TechnologyJournal Article19700101An azo dye used as photosensitizers in Dye-sensitized solar cells DSSCs. Azo dyes economically superior to organometallic dyes because they are color variation and cheap. The spectrophotometric evaluation of an azo dye in solution and on a TiO2 substrate show that the dye form J-aggregation on the nanostructured TiO2 substrate. Oxidation potential measurements for used azo dyes ensured an energetically permissible and thermodynamically favourable charge transfer throughout the continuous cycle of photo-electric conversion. The performance of dye-sensitized solar cells based on azo dyes have been studied. The results illustrate that the dye containing acetic acid and sulfonic acid as the acceptor group gave the maximum conversion efficiency 3.52 and 3.17 in the presence and absence of anti-aggregation agent, respectively.https://pccc.icrc.ac.ir/article_75864_6635afa75063e224f46e40ef6ced9520.pdfInstitute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21348420151101Preparation, Characterization and Abrasion Resistance Property of Melamine Formaldehyde / Montmorillonite Nanocomposite Coatings2672817586510.30509/pccc.2015.75865ENH.ResalatiDepartment of pulp and paper technologies, Gorgan university of agricultural sciences and natural resourcesA.HatamDepartment of Pulp and Paper Technology, Gorgan University of Agricultural Sciences and Natural ResourcesM.R.Dehghani FirouzabadiDepartment of pulp and paper technologies, Gorgan university of aggricultural sciences and natural resourcesJournal Article19700101This study investigates preparation of melamine formaldehyde / montmorillonite nanocomposite coatings and evaluates its abrasion resistance property as a new material for wood based panel products. The ultrasonicated MF resin/clay blends with different clay loadings were applied in the form of coatings to the saturated decorative paper to prepare thermoset prepregs. Morphology and structure of nanocomposite coatings were characterized using X-ray diffraction and field emission scanning electron microscopy FE-SEM. Then viscoelastic properties of resultant prepregs were investigated using DMTA method. Tensile strength test was employed to determine tensile modulus and toughness of different prepregs. To evaluate abrasion resistance property of cured nanocomposite coatings, Taber abrasion test was performed on panels laminated with prepregs. The results showed that although modulus of storage stiffness and tensile strength of intercalated nanocomposite containing 4 clay was lower than that of partially exfoliated nanocomposite at 1 clay, its toughness and abrasion resistance property was amazingly better. This result of Taber abrasion test suggests the contribution of nanocomposite morphology to improving the abrasion resistance property in MF/montmorillonite nanocomposites instead of stiffness and strength. It was also found that there must be a relation between clay intercalated morphology in the nanocomposite structure and improving its toughness property. However, further research is needed to gain an in-depth understanding on its affecting mechanism.https://pccc.icrc.ac.ir/article_75865_d55e774d05fa83f7a4749037be80f4ce.pdfInstitute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21348420151101Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution2832947586610.30509/pccc.2015.75866ENM.MahdavianDepartment of Surface Coating and Corrosion, Institute for Color Science and TechnologyM. M.AttarDepartment of Polymer Engineering and Color Technology , Amirkabir University of TechnologyF.ShiranLaboratory, Valoriza Water AustraliaJournal Article19700101Adsorption of benzimidazole, 2-methylbenzimidazole and 2-aminobenzimidazole on mild steel in 3.5 NaCl solution was studied using density function theory DFT calculations. In this regard, charge transfer resistance Rct and double layer capacitance Cdl obtained by electrochemical impedance spectroscopy EIS were used to calculate surface coverage and to build prediction models. When prediction models were only based on quantum chemical parameters of imidazoles, the most effective parameters were frontier orbital energies meaning that dominant mechanism of adsorption was chemisorption. However, models based on imidazoles and iron quantum chemical parameters revealed that the most effective parameter is dipole moment meaning that dominant mechanism of adsorption is physisorption. Prediction models based on inhibitor-FeOH2H2O4 and inhibitor-FeOH3H2O3 systems presented dipole moment and electron donating power as the most effective parameters for θR and θC based calculations, respectively. Such a behavior could be attributed to chemical interaction of inhibitors with FeOH2H2O4 and FeOH3H2O3 on the mild steel surface resulting in a porous thick layer which could not effectively block the surface but could decrease double layer capacitance.https://pccc.icrc.ac.ir/article_75866_32043795ee56268b4a70930366783409.pdfInstitute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21348420151101Optimization mechanical properties of polyurethane/Sio2 nanocomposite on Polypropylene substrate for automotive clear coating by Taguchi method2953077586710.30509/pccc.2015.75867ENSh.Pashapour YeganehDepartment of Polymer Engineering, Islamic Azad University, Tehran South BranchM.KalaeeDepartment of Polymer and Chemical Engineering, South Tehran Branch, Islamic Azad UniversityJournal Article19700101The effect of different parameters including: nano silica content, curing temperature, type of hardener, and flash-off time on mechanical and optical properties of polyurethane PU based clearcoat was investigated via standard Taguchi L9 method. Dispersion of nano silica in the resultant nanocomposites was explored by scanning electron microscopy SEM. SEM images showed a fine dispersion through the nanocomposites at different loadings. All PU nanocomposites showed gloss in the range of 91-94 which confirms the presence of nano silica did not have an adverse impact on optical properties. Moreover, the most significant factor contributed in the hardness of samples was the nano silica content. It was shown that using high amount of nano silica 5 wt reduced hardness of clearcoats due to interrupting curing process. The clearcoats performance after carwash test indeed showed that sample containing 2 nano silica cured at 85oC with a mixture of hardener 50 biuret, 50 trimer after flash-off time of 5 min had the optimum physical and optical properties.https://pccc.icrc.ac.ir/article_75867_41f294047c545ea6ee99e13c136eac72.pdfInstitute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21348420151101Synthesis and Application of Two Organic Dyes Based on Indoline in Dye-Sensitized Solar Cells3093157586810.30509/pccc.2015.75868ENM.HosseinnezhadCenter of Excellence for Color Science and Technology,Department of Organic Colorants, Institute for Color Science and TechnologyS.MoradianFaculty of Polymer and Color Engineering,Amirkabir University of Technology, Center of Excellence for Color Science and Technology,Institute for Color Science and TechnologyK.GharanjigCenter of Excellence for Color Science and Technology,Department of Organic Colorants, Institute for Color Science and TechnologyJournal Article19700101In this paper we sensitized two new organic days dye 1 and dye 2 based on thioindigo with phenothiazine as the electron donor group. We used acrylic acid and cyanoacrylic acid as the electron acceptor anchoring group in dye 1 and dye 2 respectively. The proposed dyes were sensitized from phenothiazine as the starting material by standard reactions and characterized by different techniques such as melting point, FTIR, 1HNMR, elemental analysis and UV-Visible spectroscopy after purification. Spectrophotometric measurements of the syntesised dyes in solution and on a TiO2 substrate were carried out in order to assess changes in the status of the dyes. The wavelength of maximum absorption for dye1 and dye 2 in solution are 499 nm and 505 nm and on TiO2 films are 523 nm and 527 nm, respectively. Finally, the proposed dyes used as sensitizer in a dye solar cell structure and their photovoltaic properties investigated. The Conversion efficiency for dye 1 and dye 2 are 2.34 and 3.07, respectively.https://pccc.icrc.ac.ir/article_75868_81c2ad3557535cefbcc05004571b5b53.pdfInstitute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21348420151101Naphthalene-based azo dyes: Synthesis, characterization and dyeing performance on polyester fibers3173277586910.30509/pccc.2015.75869ENA.MohammadiDepartment of Chemistry,Faculty of Sciences, University of GuilanF.GholshahiDepartment of Chemistry , University of GuilanH.GhafooriDepartment of Chemistry, University of GuilanJournal Article19700101In the present study, five naphthalene-based azo dyes were obtained using classical azo coupling reactions. The structure of the dyes was characterized and confirmed by the UV-vis, FT-IR, 1H NMR and 13C NMR analyses. The solvatochromic behavior of the dyes was studied in a set of 10 solvents with different polarity and considerable results were obtained. The dyes were applied as disperse dyes to polyester fiber and their dyeing properties were evaluated. The fastness properties of the dyed fabrics such as wash, light and rubbing fastness degrees were measured by standard methods. Additionally, the prepared dyes were evaluated for antioxidant activity by ferric reducing antioxidant power FRAP method.https://pccc.icrc.ac.ir/article_75869_91b95e66c57d7b33654834e92e3ab78d.pdf