Progress in Color, Colorants and Coatings
Volume:5 Issue: 2, Summer 2012

in this paper, preparation of SrAl2O4:Eu,Dy luminescent pigment has been investigated. Coprecipitation as a low cost and facile method was selected.X-ray diffraction patterns indicated the formation of SrAl2O4 phase through calcinations process above 800 °C. Moreover, adding a few amount of silica to rawmaterials caused the structural transformation to Aluminosilicate phase during the calcination. Transparent glaze which consist of a few amount of luminescent pigment was obtained at 600 °C under different atmosphere conditions. The photoluminescence properties of luminescence glaze revealed that the firing atmosphere has significant effect on luminescence features of glaze. Although, the luminescence decay of glaze was completely eliminated in oxide atmosphere, but the green afterglow of obtained sample was remained in argon atmosphere.

n this article, statistical survey has been used to investigate effective parameters of tributyltin chloride bioaccumulation in food in one of the native fish species of Persian Gulf, Scat fish (Scatophagus argus), within a time period of 21 days at marine simulated aquarium bioassay. The Design Expert software (ver. 7) was applied for statistical analyzing the effects of biocide concentration in food and exposure time on compound concentration variations in fish tissues. Effects of concentration on the amount of absorption and accumulation of TBT were significant. The results show that there is relation between these factors. The results of the statistical analysis illustrate that exposure process is more sensible to the exposure time than to concentration ofthe biocide. The results present that body of fishes resist against biocide at limited period, and cellular metabolism controls the amount of bioaccumulation of biocide for a while, but bodies would lose their abilities and bioaccumulation would increase instantly and rapidly. The results have been improved by a modified cubic experimental model.

nowadays, natural dyes obtained from bioresources are significantly used in many applications such as textile and carpet industry. As a natural dye, saffron petals are used in this study for dyeing wool fibers. A series of dyeing formulations were prepared with saffron petals and different mordants. The mordant effect on hue, light and wash fastness of dyed fibers was investigated. The results showed that varied hues from light yellow to light brown were obtained. It was found that the best mordants in this study to improve wash and light fastness of dyed fibers were FeSO4 and Na2Cr2O7.

different industries are usually faced with computer color matching as an important problem. The most famous formula, which is commonly used for recipe prediction is based on the Kubelka-Munk (K-M) theory.Considering that spectrophotometer’s geometry and its situation influence the measured spectral values, the performance of this method can be affected by the instrument. In the present study, three spectrophotometer geometries including 45/0, d/8 with specular component included mode and d/8 with specular component excluded mode were compared in the case of recipe prediction of textile samples using K-M theory. Comparing the applied measuring situations,the color matching results obtained from d/8 geometry in SCE mode were far better than the others, while 45/0 geometry gives inferior performance which may be caused by the textured surface of textile fabrics.

in this article, the effect of potassium on the phase formation and anticorrosion properties of zinc phosphate pigments has been investigated.The co-precipitation method was selected as synthesis method of potassium zinc phosphate pigment. Then the synthesized pigment was characterized by xray diffraction (XRD), Fourier transform infrared (FTIR) and Raman spectroscopy. Morphology of the powders was investigated with scanning electron microscopy (SEM). The inhibition efficiency of this pigment was compared to the commercial zinc phosphate pigment in a 3.5 % NaCl solution by means of electrochemical impedance spectroscopy (EIS) on mild steel specimens. The surface composition and morphology of mild steel specimens after exposure to the test solutions were examined by scanning electron microscopy- energy dispersive X-ray spectroscopy (SEM-EDX). The resultsindicate the better corrosion inhibitive performance of potassium zinc phosphate in comparison with the commercial zinc phosphate.

this paper presents the influence of Hybrane H 1500 as a hyperbranched polymer on kinetic parameters of dyeing compounded fiber grade PET (polyethylene terephthalate) at boiling temperature. C.I. Disperse Red 324 was used as a disperse dye for dyeing compounded fiber grade PET. The result was compared with corresponding properties of unmodified PET. Thedyeing rate constants and diffusion coefficients as the dyeing kinetic parameters were determined. The obtained results indicated that the rate of dyeing is closely related to the diffusive behavior of dye into the fiber. The dyeing rate of modified PET was faster than that of unmodified PET. It was also found that the modified PET containing 0.5% hyperbranched polymer as additive has higher diffusion coefficient as well as dyeing rate constant comparing to unmodified PET. Small angle x-ray scattering (SAXS) was used to characterize compounded PET. SAXS measurement used to determine size and shape. It showed there exist a homogeneous dispersion of hyperbranched polymer in compounded sample.

this paper presents the influence of Hybrane H 1500 as a hyperbranched polymer on kinetic parameters of dyeing compounded fiber grade PET (polyethylene terephthalate) at boiling temperature. C.I. Disperse Red 324 was used as a disperse dye for dyeing compounded fiber grade PET. The result was compared with corresponding properties of unmodified PET. Thedyeing rate constants and diffusion coefficients as the dyeing kinetic parameters were determined. The obtained results indicated that the rate of dyeing is closely related to the diffusion behavior of dye into the fiber. The dyeing rate of modified PET was faster than unmodified PET. It was also found that the modified PET containing 0.5% hyperbranched polymer as an additive had higher diffusion coefficient as well as dyeing rate constant comparing to unmodified PET. Small angle x-ray scattering (SAXS) was used to characterize compounded PET. SAXS measurement determined the size, shape and showed a homogeneous dispersionof hyperbranched polymer in compounded sample.