Browsing by Author "Khalil, H. M."

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Cellulosic/wool pigment prints with remarkable antibacterial functionalities
(ELSEVIER, 2015) Ibrahim, N. A.; Eid, B. M.; Khalil, H. M.
Several bio-active agents namely choline chloride, triclosan derivative, PEG-600 and 4-hydroxybenzophenone were successfully included into solvent-free pigment formulations, in a single-stage process, followed by screen printing and microwave-fixation to obtain antibacterial functionalized cellulosic/wool pigment prints. Results obtained signify that both the improvement in functionalization and coloration properties are governed by type of antibacterial agent, kind of substrate as well as pigment colorant. The imparted antibacterial activity of the loaded bio-active agents follows the decreasing order: G+ve (Staphylococcus aureus) > G ve (Escherichia coli), keeping other parameters constant. The imparted functional and coloration properties showed no significant decrease even after 15 washings. Mode of interactions among the nominated substrates, the pigment paste constituents and the bioactive agents were also proposed. (C) 2014 Elsevier Ltd. All rights reserved.
A cleaner production of ultra-violet shielding wool prints
(ELSEVIER SCI LTD, 2015) Ibrahim, N. A.; Khalil, H. M.; Eid, B. M.
There is an urgent need to reduce the environmental impacts of textile wet processes taking in consideration product and environmental quality as well as economic concerns. Substitution of hazardous chemicals at the source and/or shortening the production steps are potential options which could be used to move towards cleaner production process and to cope with ever-increasing demands for eco-friendly textile products. In this research the possibility of enhancing both the ultra-violet shielding and coloration properties of wool fabric in a single-stage using beta-cyclodextrin or monochlorotriazinyl beta-cyclodextrin as well as certain ultra violet absorbers or blockers as additives to other environmentally benign printing paste components was investigated. The modified one-step coloration and functionalization method, using safer textile auxiliaries, less energy, and water consumption, proved to have positive impacts on the depth of the obtained prints and their fastness properties as well as on their ability to shield the harmful ultra-violet B-radiation without seriously affecting the environment. The enhancement in the imparted properties is governed by type of cydodextrin, degree of fixation onto/ within the wool structure, type and extent of immobilization of the used ultra violet protector, type of dye and its mode of interaction, as well as degree of interactions among the nominated printing paste components and the wool active sites during the steam fixation step. The imparted ultra-violet protection properties to the modified wool prints show obviously improved durability to wash compared to the unmodified ones. (C) 2014 Elsevier Ltd. All rights reserved.
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.
Enhancing disperse printing and ultraviolet protecting of polyester-containing fabrics via pretreatment with chitosan/polyethylene glycol/dimethylol dihydroxyethylene urea
(SAGE PUBLICATIONS LTD, 2013) Ibrahim, N. A.; El-Zairy, E. M. R.; El-Zairy, M. R.; Khalil, H. M.
Pretreatment of polyester-containing fabrics with chitosan, polyethylene glycol along with N-methylol crosslinking agent (ArkofixA NDW, DMDHEU) in the presence of MgCl2. 6H2O/citric acid as a mixed catalyst was carried out for enhancing their printability with disperse dyes as well as upgrading their ultraviolet-protecting properties. The results showed that the changes in the depth of the obtained prints are governed by the type of substrate, chitosan concentration and steaming conditions. On the other hand, incorporation of polyethylene glycol in the pretreatment bath results in a remarkable improvement in the depth of the post-printed fabric samples. Scanning electron microscope images showed the presence of chitosan-based deposits firmly attached to the surface of the pretreated fabric samples. The mechanism of surface modification via loading of chitosan with its amino groups along with polyethylene glycol moieties onto and/or into the finish/fabric matrix was proposed.
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.