Browsing by Author "Allam, E. E"

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Eco-Friendly Technology for Textile Printing Using Innovative Self Printing Paste
(NAT INFORM & DOCUMENT CENTRE, 2011-10) Abd El-Thalouth, J. I; Allam, E. E; Nassar, S. H; Ragheb, A. A; Hebeish, A
TARA SEEDS were subjected to mechanical crushing sieving and soaking in water followed by filtration to obtain galactomannan gum. Rheological properties of this gum were investigated before and after the gum was treated with sodium hydroxide (0.5 to 10%). Experience gained from this study was used to concurrently isolate eco-friendly galactomannan gum and safety natural dye from Tara seeds in one step process. Evaluation was made of the obtained self printing paste for printing cotton, wool and silk fabrics in presence and absence of different mordants. It was found that pastes of Tara gum treated with sodium hydroxide at a range of 0.5 to 2 % exhibit non-Newtonian pseudo plastic behavior, whereas the latter is converted at higher alkali concentrations to non-Newtonian Thixotropic behavior; similar to pastes prepared from the untreated gum. The colored printing paste, which was isolated from Tara seeds, could successfully be used in printing of silk, wool and cotton fabrics without any additives, but the shade was only confined to one color. It was also found that the K/S values of silk and wool are practically equal meanwhile they are higher than that of cotton. Mordants enhance printing and create different colors, depending upon their nature. For example the K/S of printed cotton samples displays the highest value with tannic acid and the lowest with alum and follows the order: tannic acid > copper sulphate > ferrous sulphate > potassium dichromate > alum; an order which is also valid for wool and silk fabrics. Fabrics printed by the self printing paste acquire color fastness to rubbing, to washing, and to perspiration ranging from very good to excellent, besides, resistance of the prints to alkali treatment.
Fabrication of radically new colorants based on Indigo Blue Vat Dye/polymer/layered Silicate intercalated nanocomposites induced cotton prints with Batik and Denim effects
(INNOVATIVE SCIENTIFIC INFORMATION & SERVICES NETWORK, INNOVATIVE SCIENTIFIC INFORMATION & SERVICES NETWORK, 2019-06) Shaban, H. A.; Allam, E. E; Abd El-Thalouth, I; Ragheb, A. A; Shahin, A. A.; Hebeish, A. A
Our research outputs lead currently to a radically new base for innovation of a number of ultrafine colorants that are characterized by their involvement in the textile structure through mechanical trapping mechanism in addition to diffusion mechanism. These printing mechanisms are behind the high colour fastness and improved colour strength of the prints and also avoiding the lengthy steps involved in reduction and oxidation of the indigo vat dye associated with their harm effect on environment. The innovation comprises intercalation of indigo blue vat dye with the silicate layered nano-composite which is a natural clay known as Montmorillonite (MMT-K10). Four innovative hybrid nano-composites colorants are synthesized as per the following mixtures: (1) indigo vat dye/MMT-K10/chitosan mix; (2) Indigo vat dye/MMT-K10/in situ formed polyacrylamide mix; (3) Indigo blue vat dye/MMT-K10/citric acid mix and (4) Indigo blue vat dye/MMT-K10/chitosan/citric acid mix. The antibacterial ability of these ultrafine colorants to produce prints on cotton textiles as well as fastness properties and colour strength of these printed fabrics are reported.
Multifunctional Smart Nanocolorants for Simultaneous Printing and Antibacterial Finishing of Cotton Fabrics
(NATL INFORM & DOCUMENT CENTRE, 2019-04) Shaban, H. A; Shahin, A. A; Ragheb, A. A; El-Thalouth, I. Abd; Allam, E. E; Hebeish, A. A.
THE presented work studied the synthesis of a new multifunctional smart nanocolorant based on natural clay (montmorillonite K10), chitosan and metal nanoparticles (CuO, ZnO, TiO2 or Ag) using ultrasonic technology. The prepared nanocolorants were characterized for their particle size and properties. These nanocolrants were used in printing paste for application to cotton fabric before and after sonication. Surface morphology antibacterial activity and fastness properties were evaluated for treated fabrics. It is observed that fabrics printed with prepared materials after sonication acquire much smoother surface than those printed with prepared materials before sonication. The new hybrid particles are small enough to diffuse into fibers and they create high fastness properties. In addition, printed fabrics with hybrids particles are highly fixed on the fabric surface.