Browsing by Author "Ibrahim, N. A"

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Single-stage process for bifunctionalization and eco-friendly pigment coloration of cellulosic fabrics
(TAYLOR & FRANCIS LTD, 2016) Abou Elmaaty, T. M; Eid, B. M; Abd El-Aziz, E; Ibrahim, N. A
A facile single-stage process for enhancing the antibacterial activity and UV-shielding property of cotton and viscose pigment prints was reported. Results indicated that both the functional and coloration properties of the obtained pigment prints were improved significantly by incorporation of TiO2 nano sol (average molecular size approximate to 5 nm, 15 g/kg) into the solvent-free pigment printing pastes. Differences in the imparted antibacterial activity and UV-blocking properties as well as in the depth of the modified pigment prints were attributed to the differences in the type of cellulosic substrate, efficiency of the used binding agent, extent of loading, and immobilizing both the TiO2-NPs and pigment particles during the microwave-fixation step as well as on the type of pigment colorant. Also, the obtained results demonstrated that the modified pigment prints, i.e. TiO2-NPs-loaded pigment prints, showed durable antibacterial efficacy and UV-shielding capacity even after 15 washing cycles, regardless of the used substrate. The scanning electron microscope images and EDX spectra of selected samples were also reported.
Smart options for simultaneous functionalization and pigment coloration of cellulosic/wool blends
(ELSEVIER SCI LTD, 2013) Ibrahim, N. A; Khalil, H. M.; El-Zairy, E. M. R.; Abdalla, W. A.
The present innovative research work deals with the individual use of chitosan (2.5 g/kg), Aloe vera (10 g/kg), triclosan (10 g/kg), TiO2-nanoparticles (TiO2-NP's, 10 g/kg), silicon micro-emulsion (20 g/kg) or a water/oil-repellent agent (40 g/kg) for modifying the pigment print paste to produce functionalized cotton/wool and viscose/wool pigment prints in one step process. The imparted functional properties such as antibacterial, antibacterial/UV-protection, soft-handle or water/oil-repellency together with the change in the printing properties were evaluated. Some of the obtained pigment prints were characterized by scanning electron microscope (SEM), and energy dispersive X-rays (EDX) to confirm deposition of certain functional additives on printed fabrics. The wide-range of imparted functional properties together with the depth of the obtained pigment prints were maintained over 80% even after 15 consecutive laundering cycles. The extent of retention in functional and pigment printing properties is influenced by the type of functional additive as well as the kind of substrate. (C) 2013 Elsevier Ltd. All rights reserved.
Union disperse printing and UV-protecting of wool/polyester blend using a reactive beta-cyclodextrin
(ELSEVIER SCI LTD, 2009) Ibrahim, N. A; El-Zairy, E. M. R.
Pretreatment of wool/polyester blend fabric with monochlorotriazinyl beta-CD was carried out for modifying the wool component to be able to form "host-guest" inclusion complexes with disperse dyes during the subsequent disperse printing step thereby leading to union disperse printing. The optimum sequence/conditions of treatment based on the data obtained were: padding of the blend fabric with an aqueous formulation composed of monochlorotriazinyl beta-CD (60 g/L), Fixapret (R) ECO (20 g/L), citric acid (5 g/L), PEG-600 (10 g/L), wet-pickup (70%), thermofixing at 120 degrees C/5 min, thoroughly washing, drying, followed by postprinting with disperse dyes and finally steaming at 140 degrees C for 30 min. Our experimental results reveal that fixing of the used monochlorotriazinyl beta-CD onto and/or within the wool component has modified its structure thereby increasing its ability to pick-up, adsorb as well as to retain the guest disperse dye vapors into its grafted hydrophobic cavities, which in turn resulted in attaining union-disperse printing with deeper shades and remarkable fastness properties. As a result of inclusions, the obtained prints exhibit excellent UV-protecting functions. The surface morphology has been studied using SEM micrographs. (C) 2008 Elsevier Ltd. All rights reserved.