Browsing by Author "Abd El-Aziz, E."

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Combined antimicrobial finishing and pigment printing of cotton/polyester blends
(ELSEVIER SCI LTD, 2013) Ibrahim, N. A.; Abou Elmaaty, T. M.; Eid, B. M.; Abd El-Aziz, E.
his study demonstrates the possibility of enhancing the antibacterial functionality and pigment printing properties of cotton/polyester blends (50/50 and 35/65) in one step. Inclusion of chitosan (10 g/kg), choline chloride (15 g/kg), triclosan derivative (20 g/kg), hyperbranched poly amide-amine/silver or zinc oxide nanoparticles (HBPAA/Ag-NP's hybrid or HBPAA/ZnO-NP's hybrid - 20 g/kg) into a pigment print formulation followed by printing and microwave curing at 386W for 5 min results in an improvement in antibacterial activity and pigment printability. It was further noted that, in all cases, the G+ve (S. aureus) bacteria is more susceptible to the action of the immobilized antibacterial agents than the G-ve bacteria (E. coli). The functionalized pigment prints exhibited very sufficient antibacterial activity even after 20 washing cycles. Modes of interactions were proposed, and surface modification was also confirmed by SEM and EDX analysis. (c) 2013 Elsevier Ltd. All rights reserved.
Facile Bifunctional Dyeing of Polyester under Supercritical Carbon Dioxide Medium with New Antibacterial Hydrazono Propanenitrile Dyes
(AMER CHEMICAL SOC, 2014) Abou Elmaaty, T.; El-Taweel, F.; Abd El-Aziz, E.; Okubayashi, S.
In this work, new hydrazonopropanenitrile dyes with potential antibacterial activity were applied for dyeing polyester fabrics with supercritical carbon dioxide as a dyeing medium. The experimental conditions were optimized to obtain both visibly and spectrophotometrically uniform dye uptakes in the fabric. Raman microspectroscopy firmly indicated the dye uptake through all layers of the fabric. The color strength of the fabric was evaluated by K/S measurements and proved to be higher than those of conventional dyeing. The fastness properties of the dyed fabric were evaluated and found to give excellent results. The antibacterial test was performed according to the AA-TCC method, and the results were recorded.
Functionalization of linen/cotton pigment prints using inorganic nano structure materials
(ELSEVIER SCI LTD,, 2013) Ibahim, N. A.; Eid, B. M.; Abd El-Aziz, E.; Abou Elmaaty, T. M.
The present work opens up a novel strategy for the development of new multifunctional cellulosic pigment prints. The developed process aims at modifying the solvent-free pigment printing formulations via inclusion of certain inorganic nano materials namely silver (Ag-NPs), zinc oxide (ZnO-NPs), zirconium oxide (ZrO2-NPs) or titanium dioxide (TiO2-NPs) at 20 g/kg paste followed by screen printing and microwave fixation. The imparted functional properties together with the depth of the obtained prints are governed by the type of nano additives, type of binder and the pigment colorant. The imparted antibacterial and/or UV protection properties to the pigment prints were retained with an acceptable level (>70%) of durability even after 20 washing cycles. The presence of nano materials on the surface of the obtained pigment prints was confirmed using SEM images and EDX spectra. (C) 2013 Elsevier Ltd. All rights reserved.
A smart approach to add antibacterial functionality to cellulosic pigment prints
(ELSEVIER SCI LTD, 2013) Ibrahim, N. A.; Eid, B. M.; Abou Elmaaty, T. M.; Abd El-Aziz, E.
This study was devoted to enhancing the antibacterial functionality of pigment printed cotton, linen and viscose fabrics. Ag-NP's/PVP colloid, triclosan derivatives, chitosan or choline chloride was successfully incorporated into the pigment paste followed by printing and microwave curing to impart antibacterial activity to the cellulosic prints. Results obtained demonstrate that the modified pigment prints exhibit a remarkable antibacterial activity against the G+ve (Staphylococcus aureus) and G-ve (Escherichia coli) bacteria with a noticeable durability after 20 washing cycles without adversely affecting the printing and softness properties. The extent of printability and functionality of the nominated substrates are significantly governed by the type of: bio-active ingredient, binder, pigment and substrate. TEM, SEM and EDX analysis confirmed the formation of Ag-NP's/PVP colloid, of particle size range 7-14 nm, deposition of cross-linked-binder film onto the modified pigment prints, and the existence of elementary Ag and Si loaded onto fabrics surface, respectively. (C) 2013 Elsevier Ltd. All rights reserved.