Production of Smart Cotton-nickel Blend Fibers Using Functional Polymers Comprising Ammonium Polyphosphate and Silicone Rubber

Mehrez E. El-Naggar,Ola A. Abu Ali,Dalia I. Saleh,K. M. Abu-alnja,Abd-allah M. Mnsour,Mohammed A. Abu-Saied,Tawfik A. Khattab 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6

Despite the fact that Pyrovatex is widely used as a commercial flame-retardant, the release of toxic formaldehyderemains a serious problem. Fluorine-based compounds, on the other hand, have been employed to impart hydrophobic textilesurfaces, although they are exceedingly costly and poisonous. Based on those difficulties, we describe a simple one-stepmethod for coating electrically conductive cotton-nickel (Cot-Ni) blend fabric providing flame-retardant and water-repellentcharacteristics. A nickel ribbon was firstly bent around a cotton yarn as a core, and then woven into an electrically conductiveCot-Ni blend fabric, which was created by weaving the cotton-nikel hybrid threads with regular cotton yarns. The conductivefabric was coated with a composite consisting of silicone rubber (RTV) and ammonium polyphosphate (APP). The strongbinding of RTV with both APP and cotton fibres increased the flame-retardant action of cotton, according to the findings. Asa result, varied concentrations of APP were used in the composite to show that only 100 g/l of APP combined with RTVimproved the fire-retardancy. Depending on the concentration of APP, distinct hierarchical morphologies appeared on thesurface of the coated Cot-Ni fabrics. RTV also improved the hydrophobic character of the blend surface. Measurements of airpermeability, surface roughness, and stiffness were used to investigate the comfort qualities of the coated Cot-Ni blends. Eventually, those multifunctional (Cot-Ni)/RTV-APP textiles might be used in a variety of applications, such as grain storagecontainers, car seat mats, and firefighters' uniforms.

Synthesis, characterization and biological activity of colloidal silver nanoparticles stabilized by gemini anionic surfactants

Nabel A. Negma,Salah M. Tawfik,Ali A. Abd-Elaal 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

Here in, the new gemini anionic surfactants with different alkyl chain length were synthesized (C8A,C12A, C16A and C18A). The chemical structure of the synthesized surfactants was confirmed using infraredspectroscopy (IR) and proton nuclear magnetic resonance spectroscopy (1H NMR). Silvernanoparticles colloidal solution of 20–25 nm diameters was prepared using trisodium citrate asreducing agent. The nanostructure of the synthesized surfactant with silver nanoparticles withdiameters ranging from 6.3 to 23.2 nm was prepared and characterized using ultra violetspectrophotometer (UV), transmission electron microscope (TEM), dynamic light scattering (DLS)and energy dispersive X-ray (EDX). The results declare formation and stabilization of silver nanoparticleusing synthesized anionic surfactants. Antimicrobial activity of the synthesized anionic surfactants andtheir nanostructure with silver nanoparticles were evaluated against pathogenic bacteria and fungi. Theantimicrobial activity showed the enhancement in the antimicrobial activity of the synthesized geminianionic surfactants in the nanostructures form.

Degradation of reactive dyes wastewater supplemented with cationic polymer (Organo Pol.) in a down flow hanging sponge (DHS) system

A. Tawfik,D.F. Zaki,M.K. Zahran 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

Decolourization of reactive dyes wastewater supplemented with 1 mg/l cationic polymer (Organo Pol.) in a down flow hanging sponge (DHS) system was investigated at different HRTs and OLRs. The results obtained revealed that, increasing the HRT from 1.7 to 5 h, significantly increased the removal efficiencies of color and COD i.e. at a HRT of 5 h, and OLR not exceeding 2.8 g COD/l d, the reactor achieved removal efficiencies of 66.5 ± 7.07% for COD t and 90.12 ± 3.13% for color. However, at longer HRT of 6.0 h, the decolorization process was substantially dropped, due to high salinity content in the influent.

Molecularly Imprinted Cellulose Sensor Strips for Selective Determination of Phenols in Aqueous Environment

Tawfik A. Khattab,Meram S. Abdelrahman,Hanan B. Ahmed,Hossam E. Emam 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10

The surrounding environment is largely contaminated with phenols, and consequently qualitative and quantitativedetermination of phenols in water is of interest. In the current report, a low cost, naked-eye, portable and disposable cellulosicstrips-based sensor was fabricated to detect phenols in aqueous media. The cellulosic filter paper was molecularly imprintedwith Fe(III) to prepare strips sensor of Fe(III)-imprinted filter paper. The prepared strips were characterized by X-raydiffraction, scanning electron microscopy, energy-dispersive X-ray analysis and Fourier-transform infrared spectroscopy. Thesensitivity performance of Fe(III)-imprinted filter paper strips was monitored for a series of phenolic compounds. Thecolorimetric detection of gallic acid was selectively studied herein due to its greatest sensibility. The chromogenic Fe(III)-imprinted filter paper strips provided an instant color shift from yellow to purple upon binding to Gallic acid in an aqueousenvironment, as visually noted and instrumentally detected by absorption spectral and coloration measurements. The changein color of strips attributing to sensing of Gallic acid was readout at quite low limit (0.1 ppb). This sensor performance wasrationalized on formation of coordination complex between phenol and Fe+3. The facile fabricated molecularly imprintedfilter paper strips could be easily used as sensor in rapid potential for colorimetric detection of phenols.

Role of expanded clay aggregate, metakaolin and silica fume on the of modified lightweight concrete properties

Tawfik Taher A.,AlSaffar Doha M.,Tayeh Bassam A.,Metwally Khaled Ali,ElKattan Ibrahim M. 한국자원공학회 2021 Geosystem engineering Vol.24 No.3

This investigation aimed to assess the effect of micro-cementitious materials on the mechanical properties and sulphate resistance of modified eco-efficient lightweight concrete (MDLWC). A modified lightweight concrete (MDLWC) was produced by mixing Light-expanded clay aggregate (LECA) with normal coarse aggregate (dolomite cushed rock). The impact of using different percentage of micro-cementitious materials which was micro silica fume (5–20%) and metakaolin(10–35%) on the mechanical properties (compressive strength, splitting tensile and flexural strength), waves transmission velocity of the ultrasonic pulses and sulphate resistivity of MDLWC was studied. The overall results illustrated that the use of micro-cementitious materials in MDLWC caused an enhancement on MDLWC properties. However, the MDLWC specimens containing micro silica fume showed better results than metakaolin. The best results were observed while using samples containing 10% micro silica fume and 30 % metakaolin individually or combined. In addition, the usage of combined mixture of 10% micro silica fume and 30% metakaolin MDLWC mix showed the best improvement rate in compressive, splitting tensile and flexural strengths by 25, 53.3 and 66.6%, respectively, compared to control MDLWC specimens. On the other hand, the direct empirical equations were proposed on the basis of strong and nonlinear regression analysis using the test data to predict the mechanical properties of MDLWC relationships, rationally. Experimental tests were conducted on ultrasonic pulses velocity, which showed good correlation equation strength of MDLWC. Scanning electron microscopy illustrated that the pores of concrete is smaller for SF and MK individually or combined with MDLWC compared to the control concrete, demonstrating an enhancement within the interfacial microstructure with the pozzolanas incorporation. The previous difference could be explained due to the concrete strength and sulphate penetrability to an extent.

An Eco-Friendly Multifunctional Nano-Finishing of Cellulose/Wool Blends

Nabil A. Ibrahim,El-Amir M. Emam,Basma M. Eid,Tawfik M. Tawfik 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4

A new approach for an eco-friendly multi-functionalization of cotton/wool (C/W) and viscose/wool (V/W) blended fabrics was investigated. In this study, Ag-nanoparticle (Ag-NP) and/or ZnO-nanoparticle (ZnO-NP) functional agents were incorporated into the finishing bath along with citric acid (CA) or succinic acid (SA) as ester-crosslinking or esterifying agent, and sodium hypophosphite catalyst using the padding technique. The obtained results indicated that the extent of multi-functionalization expressed as antibacterial activity, UV-blocking functionality and wrinkle recovery ability were determined by kind of nanomaterial, nature of carboxylic acid, i.e., bi- or tri-functional and type of substrate. The results also demonstrated that blended fabrics finished with Ag-NP/ZnO-NP/CA/SHP nano-finishing formulation exhibited outstanding durable multi-functional properties even after 10 washing cycles. In addition, the change in surface morphology and the existence of Ag and/or Zn onto the selected V/W fabric surfaces have been confirmed by SEM and EDX analysis respectively.

Influence of thiourea synthesis with silica fume on the corrosion rate of reinforcement concrete

Tawfik Taher A.,El-Yamani Magdy A.,Serag Faried A.,Mohammed Shimaa M.,AbdEl-Hafez Gh.M. 한국자원공학회 2020 Geosystem engineering Vol.23 No.3

The examination of corrosion rate for steel reinforcement existent in concrete was carried out in the presence of silica fume and thiourea. The ordinary Portland cement (OPC) replacement was conducted with silica fume material at 5 and 10% by cement weight for concrete production, in addition to that using various percentage of thiourea (1, 2, 3 4 and 5%) added to concrete. Monitoring and estimating the corrosion rate for reinforcing steel existent in concrete with and without silica fume and thiourea was held with the usage of corrosion test cell. Besides, compressive and splitting tensile strength submerged in fresh and salty water of hardened concrete with and without silica fume and thiourea that were considered in the study. The immersion for all the samples of steel reinforcement with salty water (tap water with 1.5% of calcium sulphate and 3% of sodium chloride) for about 90 days of exposure were studied. The best results for the lowest corrosion rate were obtained when a mixture of silica fume with thiourea is used with concentrations of 10 and 3%, respectively compared with the ordinary concrete.

Highly selective fluorescent probe based on new coordinated cationic polyvinylpyrrolidone for hydrogen sulfide sensing in aqueous solution

Abd-Elaal, Ali A.,Tawfik, Salah M.,Lee, Yong-Ill Elsevier 2017 Journal of molecular liquids Vol.247 No.-

<P>A cationic polyvinylpyrrolidone derivative (Cat-PVP) was prepared via Claisen-Schmidt condensation in KOH media (1.0 mM) and characterized using FT-IR and H-1 NMR spectroscopy. The prepared Cat-PVP was utilized to prepare a stable fluorescent copper coordinate Cat-PVP with outstanding properties. The Cu-Cat-PVP was successfully used to detect hydrogen sulfide ( H2S) due to the strong affinity between sulfur and copper. The quenching effect on the fluorescence intensity of the Cu-Cat-PVP probe showed very good linearity with H2S concentrations in the range of 1-40 mu M, with a detection limit as low as 0.13 mu M. The promising probe displayed high selectivity toward H2S over anions and bio-thiols and was successfully applied for detecting H2S in real samples such as human serum and water. (C) 2017 Published by Elsevier B.V.</P>

Porosity and Liquid-phase Adsorption Characteristics of Activated Carbons Prepared From Peach Stones by H₃Po₄

Amina A.Attia,Badie S.Girgis,Nady A.F.Tawfik 한국탄소학회 2005 Carbon Letters Vol.6 No.2

Application of MCT-βCD to Modify Cellulose/Wool Blended Fabrics for Upgrading Their Reactive Printability and Antibacterial Functionality

Nabil A. Ibrahim,Heba M. Khalil,Basma M. Eid,Tawfik M. Tawfik 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8

Pre-loading of monochlorotriazinyl β-Cyclodextrin (MCT-βCD) onto/within viscose/wool (V/W) and cotton/wool (C/W) blended fabrics provide hosting cavities that can form host-guest inclusion complexes with reactive dyes in postprinting as well as with triclosan derivative or silver nanoparticles/hyperbranched polyamide-amine (AgNPs/HBPAA) composite in subsequent final antibacterial finishing step. Coloration properties, antibacterial activity against (S. aureus) and (E. coli) pathogenic bacteria, durability of the obtained products, according to the above mentioned route, to wash, surface morphology and composition of selected samples were investigated. Results obtained signify that premodification of the nominated substrates with MCT- βCD (10 g/l), followed by reactive printing with mono-or bifunctional reactive dye (20 g/l), and subsequent post-finishing with triclosan derivative or AgNPs/HBPAA composite (15 g/l each) is an efficient treatments sequence for attaining reactive prints with significant antibacterial efficacy and noticeable durability to wash. Surface depositions of selected active ingredients were also confirmed using SEM and EDX analysis.