Browsing by Author "Abdalla, W. A."

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Combined UV-protecting and reactive printing of Cellulosic/wool blends
(ELSEVIER SCI LTD, 2013) Ibrahim, N. A.; El-Zairy, E. M. R.; Abdalla, W. A.; Khalil, H. M.
A novel approach for attaining reactive Cotton/wool and Viscose/wool prints with outstanding UV-protection functions was achieved via inclusion of certain UV-absorbers namely 4-hydroxybenzophenone and UV-SUN (R) or UV-blockers like ZnO-NPs and TiO2-NPs along with MCT-beta CD, as a reactive additive, in the printing paste formulation using Na-alginate as a thickening agent. Experimental results reveal that the inorganic UV-blockers exhibit better UV-protection functions compared with the used UV-absorbers, and the improvement in the imparted UV-protection capacity follows the decreasing order: ZnO-NPs >TiO2-NPs > 4-hyroxybenzopherone >= UV-SUN (R) >> none > untreated. The enhancement in UV-protection functionality is governed by the type of substrate, cotton/wool > viscose/wool, extent of modification and loading of the used nano-metal oxides or organic absorbers onto the fabric surface as well functionality and ability of the used reactive dyes to absorb the hazardous UV-B radiation. The obtained functional prints exhibited outstanding UV-protection efficiency even after 15 washing cycles. (C) 2012 Elsevier Ltd. All rights reserved.
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.
Utilization of monochloro-triazine beta-cyclodextrin for enhancing printability and functionality of wool
(ELSEVIER SCI LTD, 2013) Ibrahim, N. A.; Abdalla, W. A.; El-Zairy, E. M. R.; Khalil, H. M.
Monochloro-triazine [beta-cyclodextrin (MCT-beta CD) was successfully utilized to modify the wool fabric structure. The modified wool exhibited better post-printing, using different dyestuffs, and outstanding antibacterial activities most probably due to the remarkable capacity of grafted beta CD moieties to form guest-host inclusion complexes in addition to the positive role of wool's active sites. The following treatment sequence: pre-modification, post-printing, followed by after-treatment with Ag-NP's colloid or triclosan derivatives was investigated. The extent of improvement in the aforementioned properties is governed by the degree of pre-modification, type of dyestuff and extent of fixation, type of antibacterial agent, its mode of interaction and extent of loading onto the modified printed wool. The imparted antibacterial functionalities were retained, more than 75%, even after 15 washing cycles. (C) 2012 Elsevier Ltd. All rights reserved.