Progress in Color, Colorants and Coatings
Volume:4 Issue: 1, Winter 2011

iO2 and especially its nano-metric structure have many applications for environmental proposes. It can be used in mobilized or immobilized status, but its consumption is less in immobilized form and its process is economical. In addition, the environmental problems would be minimized. There are a few methods for immobilization of nano-TiO2 inside the process. The solgelmethod is typically applied for immobilization of nano-TiO2 on Pyrex and quartz glasses, but these two glasses are expensive. To reduce the costs, two different resins have been studied for immobilization of nano-TiO2 on conventional low cost glasses, but the glass coating and its surface preparation is very critical in order to increase the stability of catalyst and its life time. In this research, the immobilization process of nano-TiO2 has been studied, and the conditions of process and critical parameters have been delineated. Different experiments have been done to characterize the properties of prepared coating, such as hardness,and water resistance measurements, and differential scanning calorimetry (DSC). Prog. Color Colorants Coat. 4(2011), 1-6. © Institute for Color Science and Technology. 1. Introduction Development of nano-technology has increased application of nano-powders and it was changed to one of important technologies on industrial wastewater treatment in 1990s. In recent works, catalyst particles have been applied in nano-sized range. The rate of reaction and decolorization has increased significantly by nano-catalysts compared to micro sized. Dispersed nano-TiO2 particles have been used in many wastewater treatment processes, but it would discharge a large amount of suspended particles to environment and requires expensive filtration system to remove nano-particles from treated wastewater. Direct discharge of these nano-particles is so harmful to environment. Therefore, immobilization of these nanoparticles on surfaces of treatment system can decrease their harmful effect [1-7]. Nano-particles of TiO2 are being directly stabilized

nionic reactive dyes used to dye nylon suffer from failures due to the poor efficiency caused by low degree of exhaustion and fixation. From the previous work, the dyeing efficiency of Procion Rubine XL+ on modified nylon was particularly week and hence offers the widest scope for an in depth investigation in to variables that affect the dyeing process. In this paper, a number of attempts were made to improve the fixation efficiency of Procion Rubine XL+ on modified nylon. The process variables were studied:(a) the effect of desalination, as well as (b) the effect of changing the counter ion from sodium to trimethyl ammonium. Consequently, reducing the electrolyte concentration and changing the counter ion resulted in reduced fixed color yield which means in all cases fixation yields generally inferior to those obtained from the commercial sample of Procion Rubine XL+. Prog. Color Colorants Coat.

lkyd resins are amongst the most important and widely used resins in coating sectors. In this communication we report on preparation of alkyd resins emulsified by grafted acrylic resins on their fatty acid moieties. Both high-shear mechanical homogenizer and ultra-sonic sonicator were used step-wise to disperse the alkyd resin and acrylic based monomers in aqueous media. The resins are of nanometric particle size (~200nm) dispersed in water in the presence of polymerization emulsifying agent. The FT-IR spectroscopy revealed the differences in the spectrum of the base resins and hybrid resin. The extraction test revealed formation of better than 99% of grafted hybrid resin. The DSC test showed that the glass-transition temperatures of the hybrid resin are very lower than that of the base alkyd and acrylic polymers which re-confirm formation of chemically grafted hybrid resin. The molecular weight of the hybrid resin was also found to be a combination of those of the base resins. The polydispersity of the base resins is about 8, whereas that of the hybrid resin locates around 32 which is resulted from differences in the molecular weight of the base resins. The films of the resulting resins were fully dried after 8 hours at room temperature without any further loss in weight or tackiness. Prog. Color Colorants Coat. 4(2011), 15-25. © Institute for Color Science and Technology.

series of monoazo disperse dyes based on naphthalimide was synthesized using N-alkylcarboxylic acid-1,8-naphthalimide as diazo component and N,N-diethylaniline derivatives as a coupling components. 4-amino-N-ethanoic (propanoic) acid-1,8-naphthalimide was synthesized from 4-nitro-1,8-naphthalic anhydride by imidation and subsequent reduction reactions. These compounds were diazotized and further coupled to substituted N, N-diethylaniline to produce dyes which give red to violet hues on polyester fabrics. The prepared dyes and their corresponding intermediates were characterized by elemental analysis, DSC, FTIR, 1HNMR and UV-Vis spectroscopic techniques. The dyed polyester fabrics showed moderate light fastnesses, very good to excellent washing, rubbing and sublimation fastnesses. Prog. Color Colorants.

n this paper, kinetics of DC electrophoretic deposition (EPD) of carbon nanotubes (CNTs) are investigated. Suspension of carbon nanotubes in pure ethanol with addition of magnesium nitrate was used as deposition media. The effect of main EPD parameters such as deposition time, applied voltage and the CNTs concentration on deposit yield were investigated. The variation of current density vs. time and the effect of magnetic stirring were also examined.The results are in good agreement with Hamaker's law and the deposit yield increases with increasing of applied voltage and CNTs concentration but there is a deviation from linear trend in longer deposition times. Stirring could compensate some of this deviation but increases the current density fluctuations. Prog.

he colorimetric error depends on the spectrophotometric inaccuracy. In this paper, a new method is introduced for determining the relationship between spectrophotometric error and colorimetric inaccuracy. The error propagation in colorimetric parameter calculation is evaluated using a linear relation between variance of reflectance spectra and CIE tristimulus values. This linear formula calculates the variance of CIE tristimulus values from the variance of reflectance spectra with sufficient accuracy. In addition, the effect of illuminants and standard colorimetric observers on the error propagation from spectral data into CIE tristimulus values is studied using the proposed relationship. The results indicate that the effect of illuminants is more than the effect of standard observer. In addition, the Standard deviation of CIE tristimulus values depends on their respective coefficients. Prog. Color Colorants Coat. 4(2011), 59-69. © Institute for Color Science and Technology.