The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Virendra Prasad - One of the best experts on this subject based on the ideXlab platform.
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functional finishing in Cotton Fabrics using zinc oxide nanoparticles
Bulletin of Materials Science, 2006Co-Authors: Achchhelal Yadav, A A Kathe, Virendra Prasad, Sheela Raj, Deepti Yadav, C Sundaramoorthy, N VigneshwaraAbstract:Nanotechnology, according to the National Nanotechnology Initiative (NNI), is defined as utilization of structure with at least one dimension of nanometer size for the construction of materials, devices or systems with novel or significantly improved properties due to their nano-size. The nanostructures are capable of enhancing the physical properties of conventional textiles, in areas such as anti-microbial properties, water repellence, soil-resistance, anti-static, anti-infrared and flame-retardant properties, dyeability, colour fastness and strength of textile materials. In the present work, zinc oxide nanoparticles were prepared by wet chemical method using zinc nitrate and sodium hydroxide as precursors and soluble starch as stabilizing agent. These nanoparticles, which have an average size of 40 nm, were coated on the bleached Cotton Fabrics (plain weave, 30 s count) using acrylic binder and functional properties of coated Fabrics were studied. On an average of 75%, UV blocking was recorded for the Cotton Fabrics treated with 2% ZnO nanoparticles. Air permeability of the nano-ZnO coated Fabrics was significantly higher than the control, hence the increased breathability. In case of nano-ZnO coated fabric, due to its nano-size and uniform distribution, friction was significantly lower than the bulk-ZnO coated fabric as studied by Instron® Automated Materials Testing System. Further studies are under way to evaluate wash fastness, antimicrobial properties, abrasion properties and fabric handle properties.
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functional finishing of Cotton Fabrics using zinc oxide soluble starch nanocomposites
Nanotechnology, 2006Co-Authors: N Vigneshwara, A A Kathe, Sampath Kuma, P V Varadaraja, Virendra PrasadAbstract:Zinc oxide–soluble starch nanocomposites (nano-ZnO) synthesized using water as a solvent and soluble starch as a stabilizer is impregnated onto Cotton Fabrics to impart antibacterial and UV-protection functions. Nano-ZnO synthesized by reacting zinc nitrate with sodium hydroxide in the presence of soluble starch absorbed strongly at 361 nm due to the quantum confinement effect. The average size of ZnO nanoparticles is estimated to be 38 ± 3 nm using a transmission electron microscope (TEM); this was confirmed by x-ray diffraction analysis and the effective mass approximation method. The starch content in synthesized nano-ZnO was estimated to be 37.57% using thermo-gravimetric analysis. The nano-ZnO impregnated Cotton Fabrics showed excellent antibacterial activity against two representative bacteria, Staphylococcus aureus (Gram positive) and Klebsiella pneumoniae (Gram negative). Also, nano-ZnO impregnation enhanced the protection of Cotton Fabrics against UV radiation in comparison with the untreated Cotton Fabrics.
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functional finishing of Cotton Fabrics using zinc oxide soluble starch nanocomposites
Nanotechnology, 2006Co-Authors: N. Vigneshwaran, A A Kathe, P.v. Varadarajan, Sampath Kumar, Virendra PrasadAbstract:Zinc oxide–soluble starch nanocomposites (nano-ZnO) synthesized using water as a solvent and soluble starch as a stabilizer is impregnated onto Cotton Fabrics to impart antibacterial and UV-protection functions. Nano-ZnO synthesized by reacting zinc nitrate with sodium hydroxide in the presence of soluble starch absorbed strongly at 361 nm due to the quantum confinement effect. The average size of ZnO nanoparticles is estimated to be 38 ± 3 nm using a transmission electron microscope (TEM); this was confirmed by x-ray diffraction analysis and the effective mass approximation method. The starch content in synthesized nano-ZnO was estimated to be 37.57% using thermo-gravimetric analysis. The nano-ZnO impregnated Cotton Fabrics showed excellent antibacterial activity against two representative bacteria, Staphylococcus aureus (Gram positive) and Klebsiella pneumoniae (Gram negative). Also, nano-ZnO impregnation enhanced the protection of Cotton Fabrics against UV radiation in comparison with the untreated Cotton Fabrics.
A Hebeish - One of the best experts on this subject based on the ideXlab platform.
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antibacterial activities and uv protection of the in situ synthesized titanium oxide nanoparticles on Cotton Fabrics
Industrial & Engineering Chemistry Research, 2016Co-Authors: Mehrez E Elnaggar, Th I Shaheen, Saad Zaghloul, M H Elrafie, A HebeishAbstract:In situ synthesis of titanium oxide nanoparticles (TiO2NPs) on Cotton Fabrics was innovatively studied. The synthesis involved the use of titanium isopropoxide (TIP) as a source of titanium hydroxide and urea nitrate as a peptizing agent responsible for conversion of titanium hydroxide to TiO2NPs. Characterization of TiO2NPs was performed using SEM-EDX, XRD, FTIR, TEM, particle size analyzer, and zeta potential. The results obtained signify the following features. TiO2NPs are deposited in the form of coating on the surface of Cotton fibers. They are composed of aggregated nanoparticles with an average size dimension that does not exceed 50 nm. On the other hand, TiO2NPs-loaded Cotton Fabrics exhibit a bacterial reduction of more than 95%, which is sustainable even after 20 washing cycles; the bacterial reduction increases by increasing the urea nitrate concentration used in the synthesis of TiO2NPs. Cotton Fabrics coated with TiO2NPs display excellent UV protection before and after washing.
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durable antibacterial and uv protections of in situ synthesized zinc oxide nanoparticles onto Cotton Fabrics
International Journal of Biological Macromolecules, 2016Co-Authors: Th I Shaheen, Mehrez E Elnaggar, Abdelrahman M Abdelgawad, A HebeishAbstract:Herein we represent a new discovery based on amine material called hexamethyltriethylene tetramine (HMTETA). We have observed that when an aqueous solution of Zn(NO3)·6H2O was added to aqueous solution of HMTETA followed by shaking for a time, the colorless solution was converted to milky color under the alkaline medium provided by HMTETA prior to formation of uniform zinc oxide nanoparticles (ZnO NPs). The latter are in situ formed within the Cotton Fabrics without the support of capping or other stabilizing agents. Obviously, then, the new made of formation of ZnO NPs speaks of a single-stage process where Cotton fabric is immersed in a prepared solution of the new precursors through which binding of ZnO NPs into the textile Fabrics takes place. Textile Fabrics are, indeed, used as a template, which is capable of maintaining the size and surface distribution of the as-synthesized nanoparticles in a uniform domain. It is also likely that nanoparticles is confined inside the fibril and microfibrils of the Cotton fibers. World-class facilities have been employed to follow up the synthesis of ZnO NPs, their characterization and their application to confer, in particular, high durable antibacterial and UV protective function on Cotton Fabrics.
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antimicrobial effect of silver nanoparticles produced by fungal process on Cotton Fabrics
Carbohydrate Polymers, 2010Co-Authors: M H Elrafie, Th I Shaheen, A A Mohamed, A HebeishAbstract:Abstract Nanobiotechnology was used for the preparation of the silver nanoparticles colloid by making use of biomass filtrate of fungus Fusarium solani. Finishing formulation containing as low as 54 ppm nanosilver particles were prepared and applied to Cotton Fabrics with and without binder. The finished Fabrics were characterized by Scanning Electron Microscopy. The efficiency and durability of the nanosilver particles-based antibacterial finish were determined. The finish appears as deposits on the surface of the fibrils/fiber of the treated Cotton. Efficiency of the antibacterial finish on the Cotton fabric, expressed as bacterial reduction %, amounts to 97% and 91% for Staphylococcus aureus and Escherichia coli, respectively. These values are reduced to 53% and 48.7% upon exposing to laundering for 20 cycles. This problem was overcome by incorporation of a binder in the finishing formulation: Under this condition antibacterial Cotton Fabrics having bacterial reduction of 94% and 85% after 20 washing cycles could be prepared.
Qi Zhong - One of the best experts on this subject based on the ideXlab platform.
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enhanced stain removal and comfort control achieved by cross linking light and thermo dual responsive copolymer onto Cotton Fabrics
ACS Applied Materials & Interfaces, 2019Co-Authors: Sophie Nieuwenhuis, Guangpeng Wu, Bisheng Wu, Peter Mullerbuschbaum, Min Lu, Zhikang Xu, Qi Zhong, Jiping WangAbstract:Enhanced capabilities of stain removal and comfort control are simultaneously achieved by the light and thermo dual-responsive copolymer poly(triethylene glycol methyl ether methacrylate-co-ethylene glycol methacrylate-co-acrylamide azobenzene) (P(MEO3MA-co-EGMA-co-AAAB)) cross-linked on Cotton Fabrics. P(MEO3MA-co-EGMA-co-AAAB) is synthesized by sequential atom transfer radical polymerization with a molar ratio of 8 (MEO3MA):1 (EGMA):1 (AAAB). The MEO3MA units induce a thermoresponsive behavior to the copolymer. The hydrophilicity of the copolymer films can be further improved by the light-induced trans–cis isomerization of the AAAB units with UV radiation. The copolymer is facilely immobilized onto Cotton Fabrics with 1,2,3,4-butane tetracarboxylic acid as cross-linker. Due to the immobilization of P(MEO3MA-co-EGMA-co-AAAB), the hydrophilicity of the fabric surface is increased under UV radiation. Therefore, by simply installing a UV light source in the washing machine, better capability of stain remova...
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Enhanced Stain Removal and Comfort Control Achieved by Cross-Linking Light and Thermo Dual-Responsive Copolymer onto Cotton Fabrics
2019Co-Authors: Qi Zhong, Sophie Nieuwenhuis, Peter Müller-buschbaum, Jiping WangAbstract:Enhanced capabilities of stain removal and comfort control are simultaneously achieved by the light and thermo dual-responsive copolymer poly(triethylene glycol methyl ether methacrylate-co-ethylene glycol methacrylate-co-acrylamide azobenzene) (P(MEO3MA-co-EGMA-co-AAAB)) cross-linked on Cotton Fabrics. P(MEO3MA-co-EGMA-co-AAAB) is synthesized by sequential atom transfer radical polymerization with a molar ratio of 8 (MEO3MA):1 (EGMA):1 (AAAB). The MEO3MA units induce a thermoresponsive behavior to the copolymer. The hydrophilicity of the copolymer films can be further improved by the light-induced trans–cis isomerization of the AAAB units with UV radiation. The copolymer is facilely immobilized onto Cotton Fabrics with 1,2,3,4-butane tetracarboxylic acid as cross-linker. Due to the immobilization of P(MEO3MA-co-EGMA-co-AAAB), the hydrophilicity of the fabric surface is increased under UV radiation. Therefore, by simply installing a UV light source in the washing machine, better capability of stain removal is realized for the cross-linked Cotton Fabrics. It can prominently reduce the consumption of energy, water, and surfactants in laundry. In addition, the trans-AAAB units of the copolymer cause the cross-linked P(MEO3MA-co-EGMA-co-AAAB) layer to be more hydrophobic under ambient conditions. Hence, the copolymer can more easily collapse and form a porous structure on the Fabrics. Thus, the air permeability of Cotton Fabrics cross-linked with P(MEO3MA-co-EGMA-co-AAAB) is enhanced by 13% at human body temperature as compared to P(MEO3MA-co-EGMA), giving improved comfort control during daily wear
Mehrez E Elnaggar - One of the best experts on this subject based on the ideXlab platform.
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nanocomposites based on chitosan silver clay for durable multi functional properties of Cotton Fabrics
Carbohydrate Polymers, 2018Co-Authors: Mohamed Rehan, Mehrez E Elnaggar, Hamada Mashaly, Ralph WilkenAbstract:The present work addresses an innovative approach for benign development of environmentally synthesis of chitosan-based nanocomposite. The synthesis involves the inclusion via interaction of AgNPs and clay with chitosan (Cs) giving rise to Cs/AgNPs and Cs/AgNPs/clay nanocomposites which when applied independently induce super functionalities. Comparison is made among the two nanocomposites with respect to their intimate association with the in depth Cotton fibre-fabric surfaces and the onset of this on the multi-functionalization of Cotton Fabrics. It is as well to emphasize that Cs/AgNPs/clay nanocomposites prove unequivocally that its use in one–step treatment process for Cotton Fabrics results in imparting very appreciable good technical properties which, in turn, are reflected on all the gained functionalities of Cotton Fabrics. Of these functional performance properties, mention is made of Cotton Fabrics which exhibit high strength, uniform morphology, increased thermal stability, successful deposition of the composite on the surface of Cotton Fabrics, high water absorption, antimicrobial activity, flame retardant, controlled release of fragrance and UV protection. The obtained data indicate that the treatment for Cotton Fabrics with these nanocomposite is stable against washing even after 20 washing cycles. Based on encourage data, the environmental benign synthesis of Cs/AgNPs/clay nanocomposites is considered as a promising nanocomposite for the multifunctional finishing textiles.
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surface modification of sio 2 coated zno nanoparticles for multifunctional Cotton Fabrics
Joint International Conference on Information Sciences, 2017Co-Authors: Mehrez E Elnaggar, Ahmed G Hassabo, Amina L Mohamed, Tharwat I ShaheenAbstract:A simple chemical synthetic route was designed to prepare zinc oxide nanoparticles (ZnO-NPs) by using sodium alginate as anti-agglomeration agent in the presence of sodium hydroxide as alkali. Next, surface modification of ZnO-NPs with SiO2 nanoparticles was achieved as per to sol-gel process. Further enhancing of the multifunctional properties of SiO2@ZnO-NPs was conducted successfully thanks to (aminopropyl)triethoxysilan (APTES) and vinyltriethoxysilan (VTES) which, in turns, increase the affinity of the SiO2@ZnO-NPs nanocomposite towards glycosidic chains of Cotton Fabrics. Thorough characterizations of synthesized ZnO-NPs, SiO2@ZnO-NPs, SiO2@ZnO-NPs/APTES and SiO2@ZnO-NPs/VTES were conducted by the making use of well advanced techniques such as FT-IR, XRD, TEM, DLS and SEM-EDX. The data obtained clarified the formation of an interfacial chemical bond between ZnO and SiO2 as affirmed by FT-IR and XRD analysis. In addition, the results revealed by TEM, zeta sizer and SEM-EDX techniques, declared that the amorphous layers of SiO2, APTES or VTES evenly coated the surface of ZnO-NPs. For these nanocomposites, the work was extended to render Cotton Fabrics multifunctional properties such as antibacterial and UV protection with high durability even after 20 washing cycles using pad dry cure method. Taking the advantages of the silane compounds terminated by active groups such as OH, NH2, etc., open the door for further functionalization of the Cotton Fabrics' surfaces by durable multifunctional agents applied in various applications.
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antibacterial activities and uv protection of the in situ synthesized titanium oxide nanoparticles on Cotton Fabrics
Industrial & Engineering Chemistry Research, 2016Co-Authors: Mehrez E Elnaggar, Th I Shaheen, Saad Zaghloul, M H Elrafie, A HebeishAbstract:In situ synthesis of titanium oxide nanoparticles (TiO2NPs) on Cotton Fabrics was innovatively studied. The synthesis involved the use of titanium isopropoxide (TIP) as a source of titanium hydroxide and urea nitrate as a peptizing agent responsible for conversion of titanium hydroxide to TiO2NPs. Characterization of TiO2NPs was performed using SEM-EDX, XRD, FTIR, TEM, particle size analyzer, and zeta potential. The results obtained signify the following features. TiO2NPs are deposited in the form of coating on the surface of Cotton fibers. They are composed of aggregated nanoparticles with an average size dimension that does not exceed 50 nm. On the other hand, TiO2NPs-loaded Cotton Fabrics exhibit a bacterial reduction of more than 95%, which is sustainable even after 20 washing cycles; the bacterial reduction increases by increasing the urea nitrate concentration used in the synthesis of TiO2NPs. Cotton Fabrics coated with TiO2NPs display excellent UV protection before and after washing.
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durable antibacterial and uv protections of in situ synthesized zinc oxide nanoparticles onto Cotton Fabrics
International Journal of Biological Macromolecules, 2016Co-Authors: Th I Shaheen, Mehrez E Elnaggar, Abdelrahman M Abdelgawad, A HebeishAbstract:Herein we represent a new discovery based on amine material called hexamethyltriethylene tetramine (HMTETA). We have observed that when an aqueous solution of Zn(NO3)·6H2O was added to aqueous solution of HMTETA followed by shaking for a time, the colorless solution was converted to milky color under the alkaline medium provided by HMTETA prior to formation of uniform zinc oxide nanoparticles (ZnO NPs). The latter are in situ formed within the Cotton Fabrics without the support of capping or other stabilizing agents. Obviously, then, the new made of formation of ZnO NPs speaks of a single-stage process where Cotton fabric is immersed in a prepared solution of the new precursors through which binding of ZnO NPs into the textile Fabrics takes place. Textile Fabrics are, indeed, used as a template, which is capable of maintaining the size and surface distribution of the as-synthesized nanoparticles in a uniform domain. It is also likely that nanoparticles is confined inside the fibril and microfibrils of the Cotton fibers. World-class facilities have been employed to follow up the synthesis of ZnO NPs, their characterization and their application to confer, in particular, high durable antibacterial and UV protective function on Cotton Fabrics.
A A Kathe - One of the best experts on this subject based on the ideXlab platform.
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Functional finishing of Cotton Fabrics using silver nanoparticles.
Journal of nanoscience and nanotechnology, 2007Co-Authors: N. Vigneshwaran, A A Kathe, P.v. Varadarajan, R.p. Nachane, R.h. BalasubramanyaAbstract:We have reported a novel in situ synthesis protocol for silver nanoparticles onto Cotton Fabrics. Here, Cotton fabric immersed in silver nitrate solution is autoclaved at 15 psi, 121 degrees C for 15 min. At this temperature and pressure, the aldehyde terminal of starch (residual size material on Cotton fabric) reduced the silver nitrate to silver metal and simultaneously stabilized the nanoparticles on fabric itself. The UV-visible absorption spectrum of both Cotton Fabrics and bath solution showed a typical absorption peak at 420 nm corresponding to the surface plasmon resonance of silver nanoparticles. With the help of transmission electron micrographs, the average size of the dislodged silver nanoparticles in water is calculated to be 20.9 +/- 13.7 nm. This silver nanoparticles impregnated Cotton Fabrics showed excellent antibacterial activity against Staphylococcus aureus and bacteriostasis activity against Klebsiella pneumoniae. Also, silver nanoparticles impregnated Fabrics expressed significant UV-protection capability in comparison with the untreated Fabrics.
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functional finishing in Cotton Fabrics using zinc oxide nanoparticles
Bulletin of Materials Science, 2006Co-Authors: Achchhelal Yadav, A A Kathe, Virendra Prasad, Sheela Raj, Deepti Yadav, C Sundaramoorthy, N VigneshwaraAbstract:Nanotechnology, according to the National Nanotechnology Initiative (NNI), is defined as utilization of structure with at least one dimension of nanometer size for the construction of materials, devices or systems with novel or significantly improved properties due to their nano-size. The nanostructures are capable of enhancing the physical properties of conventional textiles, in areas such as anti-microbial properties, water repellence, soil-resistance, anti-static, anti-infrared and flame-retardant properties, dyeability, colour fastness and strength of textile materials. In the present work, zinc oxide nanoparticles were prepared by wet chemical method using zinc nitrate and sodium hydroxide as precursors and soluble starch as stabilizing agent. These nanoparticles, which have an average size of 40 nm, were coated on the bleached Cotton Fabrics (plain weave, 30 s count) using acrylic binder and functional properties of coated Fabrics were studied. On an average of 75%, UV blocking was recorded for the Cotton Fabrics treated with 2% ZnO nanoparticles. Air permeability of the nano-ZnO coated Fabrics was significantly higher than the control, hence the increased breathability. In case of nano-ZnO coated fabric, due to its nano-size and uniform distribution, friction was significantly lower than the bulk-ZnO coated fabric as studied by Instron® Automated Materials Testing System. Further studies are under way to evaluate wash fastness, antimicrobial properties, abrasion properties and fabric handle properties.
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functional finishing of Cotton Fabrics using zinc oxide soluble starch nanocomposites
Nanotechnology, 2006Co-Authors: N Vigneshwara, A A Kathe, Sampath Kuma, P V Varadaraja, Virendra PrasadAbstract:Zinc oxide–soluble starch nanocomposites (nano-ZnO) synthesized using water as a solvent and soluble starch as a stabilizer is impregnated onto Cotton Fabrics to impart antibacterial and UV-protection functions. Nano-ZnO synthesized by reacting zinc nitrate with sodium hydroxide in the presence of soluble starch absorbed strongly at 361 nm due to the quantum confinement effect. The average size of ZnO nanoparticles is estimated to be 38 ± 3 nm using a transmission electron microscope (TEM); this was confirmed by x-ray diffraction analysis and the effective mass approximation method. The starch content in synthesized nano-ZnO was estimated to be 37.57% using thermo-gravimetric analysis. The nano-ZnO impregnated Cotton Fabrics showed excellent antibacterial activity against two representative bacteria, Staphylococcus aureus (Gram positive) and Klebsiella pneumoniae (Gram negative). Also, nano-ZnO impregnation enhanced the protection of Cotton Fabrics against UV radiation in comparison with the untreated Cotton Fabrics.
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functional finishing of Cotton Fabrics using zinc oxide soluble starch nanocomposites
Nanotechnology, 2006Co-Authors: N. Vigneshwaran, A A Kathe, P.v. Varadarajan, Sampath Kumar, Virendra PrasadAbstract:Zinc oxide–soluble starch nanocomposites (nano-ZnO) synthesized using water as a solvent and soluble starch as a stabilizer is impregnated onto Cotton Fabrics to impart antibacterial and UV-protection functions. Nano-ZnO synthesized by reacting zinc nitrate with sodium hydroxide in the presence of soluble starch absorbed strongly at 361 nm due to the quantum confinement effect. The average size of ZnO nanoparticles is estimated to be 38 ± 3 nm using a transmission electron microscope (TEM); this was confirmed by x-ray diffraction analysis and the effective mass approximation method. The starch content in synthesized nano-ZnO was estimated to be 37.57% using thermo-gravimetric analysis. The nano-ZnO impregnated Cotton Fabrics showed excellent antibacterial activity against two representative bacteria, Staphylococcus aureus (Gram positive) and Klebsiella pneumoniae (Gram negative). Also, nano-ZnO impregnation enhanced the protection of Cotton Fabrics against UV radiation in comparison with the untreated Cotton Fabrics.
