Co-precipitation Synthesis of CdTe/ ZnS, ZnSe, CdS and CdSe Core-Shell Quantum Dots
H.
Shirzadeh Derabi
Institute of Nanotechnology, University of Sistan and Baluchestan,Zahedan, Iran
author
M.
Shafiee Afarani
Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
author
A. M.
Arabi
Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology, Tehran, Iran
author
D.
Mohebbi-Kalhori
Chemical Engineering Department, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
author
text
article
2019
per
In the present work CdTe/ ZnS, ZnSe, CdS, CdSe core-shell quantum dots were synthesized via co-precipitation route. The effect of reflux intervals from 1 to 7 hours, on the CdTe cores, characteristics such as: photoluminescence properties, band gap, structure, and microstructure were studied. Results showed that synthesis with the reflux time of 1 hour led to proper CdTe core with the size of about 4nm, emission wavelength of 555 nm, and band gap of 2.25 eV. More reflux time caused to particle size enlargement, emission shift to higher wavelength values, and band gap decrease. Moreover, ZnS, ZnSe, CdS, and CdSe shells were in-situ synthesized on the CdTe cores. Formation of these shells led to emission red shift with the wavelength up to 591 nm and band gap decrease to 2.15 eV.
Journal of Color Science and Technology
Institute for Color Science and Technology with scientific cooperation of Iran Color Society
1735-8779
13
v.
2
no.
2019
89
98
https://jcst.icrc.ac.ir/article_81370_9f0a13fdba6d7635fc567caa83030fb6.pdf
Investigating the Effect of Various Pre-Processing Methods of the Spectral Data of Sugar Syrups on the Model Estimation of Sucrose Concentration in Near Infrared Region
M.E.
Bahrami
Department of Food Science and Technology, Islamic Azad University, Science and Research Branch of Tehran,Tehran, Iran
author
M.
Honarvar
Department of Food Science and Technology, Islamic Azad University, Science and Research Branch of Tehran, Tehran, Iran
author
K.
Ansari
Department of Color Imaging and Color Image Processing, Institute for Color Science and Technology, Tehran, Iran
author
B.
Jamshidi
Agricultural Engineering Research Institute, Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
author
text
article
2019
per
Using Near-infrared spectroscopy methods to create the physical and chemical properties estimation model of material has been developed and considered by the food industries in recent years. The present study was conducted to investigate the statistical effects of various pre-processing techniques such as Moving Average (MA), Multiplicative Scatter Correction(MSC), Savitzky-Golay(SG), Standard Normal Variate(SNV), First and Second derivative on the Near-Infrared spectral data of the sugar syrups on sucrose concentration estimation model. The results showed that the SNV and the Second derivative techniques could have an effective improvement in the estimation model.
Journal of Color Science and Technology
Institute for Color Science and Technology with scientific cooperation of Iran Color Society
1735-8779
13
v.
2
no.
2019
99
106
https://jcst.icrc.ac.ir/article_80499_90651ac5538e3acb0c60a7b9d20ae068.pdf
The Use of Laccase-Catalyzed Oxidation of Poly Phenolic Compounds of Weld in Wool Dyeing
M.
Nasiri Boroumand
Department of Carpet, Shahid Bahonar University of Kerman, Kerman, Iran
author
M.
Montazer
Textile Engineering Department, Amirkabir University of Technology
author
V.
Dutschk
Intelligent Fiber Fiber Products Group, Toonte University, Enschedeh, Netherlands
author
text
article
2019
per
Laccase is a biocompatible compound which is able to catalyze the oxidation of polyphenolic aromatic dyes and graft them to wool. Weld (Reseda Luteolla, L.) as a natural dye, contains polyphenolic aromatics with flavonoid structure and could be a substrate for Laccase. In this research, the effect of laccase on Weld and its use to make a covalant bond between wool and polyphenols compounds of Weld was studied. For this purpose the colourant compounds of Weld were extracted and the effect of laccase on it was studied by UV-Vis spectrophotometry, Size-exclusion chromatography and measuring the changes in the dissolved concentration of the oxygen co-reactant. Kinetic of Laccase-Catalyzed Oxidation of weld was studied and the effect of laccase on weld-dyed wool was surveyed. The results showed that Weld is a suitable substrate for laccase and the use of laccase can improve the dye fixation, and dye fastness against washing.
Journal of Color Science and Technology
Institute for Color Science and Technology with scientific cooperation of Iran Color Society
1735-8779
13
v.
2
no.
2019
107
117
https://jcst.icrc.ac.ir/article_81480_10e83fefd9230e3268f3b3d397d022a9.pdf
Removal of Direct Red 31 Dye from Aqueous Solutions Using Synthesized Nanocomposites Hydrogel
Kh.
Didehban
Department of chemistry, Payame Noor University, Tehran, Iran
author
F.
Kermajani
Department of chemistry, Payame Noor University, Tehran, Iran
author
text
article
2019
per
The aim of this study was to investigate the performance of nanocomposites hydrogel as adsorbents for removal of Direct Red 31 dye from aqueous solutions. Here, these nanocompsites were prepared from polyacrylamide (PAM) and polyacrylic acid (PAA) hydrogels in the presence of sodium montmorillonite as nanofiller. The resulting nanocomposites were well characterized by FTIR, TGA, XRD and SEM analysis. The effect of various operation factors such as nanocomposite dosage, solution pH, contact time and initial dye concentration on the adsorption process was studied. The results showed that the maximum adsorption capacity (qmax) of Direct Red 31 was obtained in acidic pH, contact time 90 min and adsorbent dosage 0.05 g which was 168.63, 108.22 and 128.9 mg/g in PAM, PAA and (PAM-co-PAA) nanocomposites respectively. The experimental data were fitted into Langmuir and Freundlich adsorption isotherms and it was found that data fitted well with Freundlich model. Kinetic studies showed that dye adsorption process followed the pseudo-second-order kinetic model.
Journal of Color Science and Technology
Institute for Color Science and Technology with scientific cooperation of Iran Color Society
1735-8779
13
v.
2
no.
2019
119
130
https://jcst.icrc.ac.ir/article_81501_e0c2a56ce55ac07d8c32999993aa6e15.pdf
Wool Dyeing with Harmal Seed as a Natural Dye: Investigation of Influencing Factors Using Response Surface Methodology
A.
Haji
Textile Engineering Department, Yazd University, Yazd, Iran
author
text
article
2019
per
Nowadays, there is an increasing interest in finding new sources of natural dyes with easy accessibility, high color strength, low cost, and high fastness properties. In this study, harmal seed has been used as a new source of natural dye on wool fibers. Harmal (Peganum Harmala) can be found extensively in several regions of Iran as a self-growing wild plant. Dyeing pH, dyeing Temperature and alum mordant concentration were chosen as the main influencing factors of this study and 25 samples were prepared according to the experimental design. The amounts of color strength of the dyed samples were measured. The results showed that the color strength was increased with increasing the dyebath pH and dyeing temperature. Increasing the concentration of alum decreased the color strength.
Journal of Color Science and Technology
Institute for Color Science and Technology with scientific cooperation of Iran Color Society
1735-8779
13
v.
2
no.
2019
131
140
https://jcst.icrc.ac.ir/article_81503_ed96dd08a005d219245bb23b91c960e6.pdf
Studying the Inhibition Action of Aqueous Extract of Cinnamomum Verum for Carbon Steel in 1 M HCl Solution
A.
Dehghani
Department of Chemical Engineering, Faculty of Engineering, Golestan University,Aliabad Katoul, Iran
author
Gh.
Bahlakeh
Department of Chemical Engineering, Faculty of Engineering, Golestan University, Aliabad Katoul, Iran
author
B.
Ramezanzadeh
Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, Tehran, Iran
author
text
article
2019
per
Corrosion inhibitors are a simple and economic method for corrosion control of metals in acidic environments. In this regard, green corrosion inhibitors based on plant extracts have received much attention as a suitable replacement to the synthetic and environmentally unsafe inhibitors. The presence of various active compounds in the aqueous extract of Cinnamomum Verum converted it to a rich source of green inhibitors for steel corrosion control. In this study, the inhibition action of Cinnamomum Verum extract was evaluated by electrochemical and surface analysis methods. The electrochemical impedance spectroscopy (EIS) results demonstrated that after 2.5 h steel immersion in 1 M HCl solution containing 800 ppm inhibitor 88% inhibition efficiency was obtained. In addition, the potentiodynamic polarization results indicated the significant reduction of corrosion current density, anodic and cathodic reactions rates. The images of scanning electron microscopy and atomic force microscopy evidenced the lower steel surface damage, indicating formation of inhibitor film over the steel surface. Furthermore, the inhibitor adsorption obeyed the Langmuir adsorption isotherm.
Journal of Color Science and Technology
Institute for Color Science and Technology with scientific cooperation of Iran Color Society
1735-8779
13
v.
2
no.
2019
141
154
https://jcst.icrc.ac.ir/article_81504_236cf492b63699d78810184a7d9a7c12.pdf
Electrocatalytic Degradation of Reactive Blue 222 Dye at Carbon Ceramic Electrode modified with Titanium Dioxide Nanoparticles and Multiwall Carbon Nanotube
F.
Jafari
Department of Textile and Polymer Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran.
author
N.
Nasirizadeh
Department of Textile and Polymer Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
author
M.
Mirjalili
Department of Textile and Polymer Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran.
author
text
article
2019
per
In this research, we are proposing carbon-ceramic electrodes containing TiO2 nanoparticles and MWCNT for the degradation of Reactive Blue 222 dyes by sonoelectrochemistry. In addition, an electrochemical nanosensor based on glass carbon electrode modified with graphene oxide and gold nanourchins was introduced to online determination of dye. Due to the special characteristics of nanoaddetive, the proposed nanosensor has unique features such as high surface area, accelerated electron transfer and high stability. The results of determination the Reactive Blue 222 dye in a concentration range of 25-900 μM with a detection limit 8 μM depict a good performance of the sensor for determined dye. The degradation process were optimized various factors affecting including the amount of potential difference, the amount of TiO2 nanoparticles, MWCNT and the solution pH by the statistical response surface method. At optimal conditions, including pH 0.8, potential difference 0.90 V on carbon ceramic electrode containing 0.2 wt% TiO2 and 3.89 wt% multiwall carbon nanotube during 120 min applying sonoelectrochemical degradation, 96% of 1.0 mM Reactive Blue 222 was degradaed and 88% of initial TOC value (121.33 ppm) was reduced.
Journal of Color Science and Technology
Institute for Color Science and Technology with scientific cooperation of Iran Color Society
1735-8779
13
v.
2
no.
2019
155
168
https://jcst.icrc.ac.ir/article_81549_0ab7cbb405284053df9de4760cacd02c.pdf