ORIGINAL_ARTICLE
Application of azo dye as sensitizer in dye-sensitized solar cells
An 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.pdf
2015-11-01
259
265
10.30509/pccc.2015.75864
Dye
sensitized solar cells
Sensitizers
Photovoltaic materials
Conversion efficiencies
Azo dye
Sh.
Rouhani
rouhani@icrc.ac.ir
1
Center of Excellence for Color Science and Technology,Department of Organic Colorants, Institute of Color Science and Technology
AUTHOR
M.
Hosseinnezhad
hosseinnezhad-mo@icrc.ac.ir
2
Center of Excellence for Color Science and Technology,Department of Organic Colorants, Institute for Color Science and Technology
AUTHOR
ORIGINAL_ARTICLE
Preparation, Characterization and Abrasion Resistance Property of Melamine Formaldehyde / Montmorillonite Nanocomposite Coatings
This 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.pdf
2015-11-01
267
281
10.30509/pccc.2015.75865
Montmorillonite
Melamine Formaldehyde
Nanocomposite
morphology
Abrasion resistance
H.
Resalati
hnresalati@yahoo.com
1
Department of pulp and paper technologies, Gorgan university of agricultural sciences and natural resources
AUTHOR
A.
Hatam
abhatam@yahoo.com
2
Department of Pulp and Paper Technology, Gorgan University of Agricultural Sciences and Natural Resources
AUTHOR
M.R.
Dehghani Firouzabadi
m_r_dehghani@mail.ru
3
Department of pulp and paper technologies, Gorgan university of aggricultural sciences and natural resources
AUTHOR
ORIGINAL_ARTICLE
Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution
Adsorption 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.pdf
2015-11-01
283
294
10.30509/pccc.2015.75866
Adsorption
EIS
Corrosion inhibitor
Corrosion Product
Quantum Chemistry
M.
Mahdavian
mahdavian-m@icrc.ac.ir
1
Department of Surface Coating and Corrosion, Institute for Color Science and Technology
AUTHOR
M. M.
Attar
attar@aut.ac.ir
2
Department of Polymer Engineering and Color Technology , Amirkabir University of Technology
AUTHOR
F.
Shiran
fabo356@yahoo.com
3
Laboratory, Valoriza Water Australia
AUTHOR
ORIGINAL_ARTICLE
Optimization mechanical properties of polyurethane/Sio2 nanocomposite on Polypropylene substrate for automotive clear coating by Taguchi method
The 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.pdf
2015-11-01
295
307
10.30509/pccc.2015.75867
Polyurethane
clearcoat
nano silica
Taguchi method
Sh.
Pashapour Yeganeh
shahrzad_pashapour@yahoo.com
1
Department of Polymer Engineering, Islamic Azad University, Tehran South Branch
AUTHOR
M.
Kalaee
kalaee@qut.ac.ir
2
Department of Polymer and Chemical Engineering, South Tehran Branch, Islamic Azad University
AUTHOR
ORIGINAL_ARTICLE
Synthesis and Application of Two Organic Dyes Based on Indoline in Dye-Sensitized Solar Cells
In 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.pdf
2015-11-01
309
315
10.30509/pccc.2015.75868
Synthesis and Application of Two Organic Dyes Based on Indoline in Dye
sensitized solar cells
M.
Hosseinnezhad
hosseinnezhad-mo@icrc.ac.ir
1
Center of Excellence for Color Science and Technology,Department of Organic Colorants, Institute for Color Science and Technology
AUTHOR
S.
Moradian
moradian@aut.ac.ir
2
Faculty of Polymer and Color Engineering,Amirkabir University of Technology, Center of Excellence for Color Science and Technology,Institute for Color Science and Technology
AUTHOR
K.
Gharanjig
gharanjig@icrc.ac.ir
3
Center of Excellence for Color Science and Technology,Department of Organic Colorants, Institute for Color Science and Technology
AUTHOR
ORIGINAL_ARTICLE
Naphthalene-based azo dyes: Synthesis, characterization and dyeing performance on polyester fibers
In 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
2015-11-01
317
327
10.30509/pccc.2015.75869
Azo dye
Solvatochromism
Polyester fiber
dyeing
Antioxidant activity
A.
Mohammadi
a_mohammadi@guilan.ac.ir
1
Department of Chemistry,Faculty of Sciences, University of Guilan
AUTHOR
F.
Gholshahi
golshahi.fatemeh@yahoo.com
2
Department of Chemistry , University of Guilan
AUTHOR
H.
Ghafoori
h.ghafoori@guilan.ac.ir
3
Department of Chemistry, University of Guilan
AUTHOR