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>

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.

Surface, thermodynamic and biological activities of some synthesized Gemini quaternary ammonium salts based on polyethylene glycol

AHMED SALAH MAHMOUD TAWFIK,Ali A. Abd-Elaal,새미사반,A.A. Roshdy 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-

Quaternary ammonium salts are frequently used as antimicrobial agents that disrupt cell membranethrough the binding of their ammonium cations to anionic sites in the outer tissue of bacteria. This articledescribes the synthesis of Gemini quaternary ammonium salts (G600Br, G1000Br and G1500Br). Thechemical structures of synthesized Gemini quaternary ammonium salts were confirmed using FT-IR and1HNMR spectra. The surface activity of the synthesized surfactants were determined from the surfaceand interfacial tension measurements. The surface parameter including: the critical micelleconcentration (CMC), effectiveness (pcmc), efficiency (Pc20), maximum surface excess (Gmax) andminimum surface area (Amin), were calculated from the surface tension measurements, also, the foamingand emulsification power were measured. The thermodynamic parameters of micellization andadsorption showed their tendency towards adsorption at the interfaces and also micellization in the bulkof their solutions. Screening tests of the synthesized compounds showed that the compounds exhibit aneffective antimicrobial activity on a variety of bacteria including Gram-positive bacteria (Bacillus subtilisand Micrococcus luteus), Gram-negative bacteria (Bordetella pertussis and Escherichia coli) and Fungi(Candida albicans and Aspergillus niger).

Zinc(II) modified carbon paste electrodes based on self-assembled mercapto compounds-gold-nanoparticles for its determination in water samples

Tamer Awad Ali,E.M.S. Azzam,M.A. Hegazy,A.F.M. El-Farargy,Ali A. Abd-Elaal 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

In the present study newly developed potentiometric sensors for determination of zinc(II) are presented. The proposed potentiometric method was based on the fabrication of modified carbon paste (MCPE; electrode X) and modified gold nanoparticles-carbon paste (GNPs-CPE; electrode IX) sensors. A mercapto compound of 1,4-bis(5-mercaptopentyloxy)-benzene (BMPB) alone or self-assembled on gold nanoparticles was used as modifier to construct electrode (X) and electrode (IX) sensors, respectively. The prepared electrodes exhibit Nernstian slope of 29.93 ± 0.4 and 26.0 ± 1.02 mV decade-1 towards Zn(II) ion over a wide concentration range of 6.8 × 10-10 to 2.9 × 10-2 and 1.0 × 10-7 to 1.0 × 10-2 mol L-1 for electrode (IX) and electrode (X) sensors, respectively. The limit of detection of the electrode (IX) and electrode (X) sensors was found to be 6.8 × 10-10 and 1.0 × 10-7 mol L-1, respectively. The potentiometric response of the electrode (IX) and electrode (X) based on GNPs-BMPB and BMPB are independent of pH of test solution in the pH range of 2.5–8.1 and 3–7 with a response time of 6 and 8 s for electrode (IX) and electrode (X) sensors, respectively. The proposed sensors showed fairly good discriminating ability towards Zn(II) ion in comparison with many hard and soft metal ions. Finally, the proposed electrodes were successfully used as indicator electrodes in potentiometric titration of zinc ion with sodium tetraphenylborate (NaTPB) and in direct determination of Zn(II) ion in some water samples. The results obtained compared well with those obtained using atomic absorption spectrometry.

Shear behaviour of thin-walled composite cold-formed steel/PE-ECC beams

Ahmed M. Sheta,Xing Ma,Yan Zhuge,Mohamed A. ElGawady,Julie E. Mills,El-Sayed Abd-Elaal 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.1

The novel composite cold-formed steel (CFS)/engineered cementitious composites (ECC) beams have been recently presented. The new composite section exhibited superior structural performance as a flexural member, benefiting from the lightweight thin-walled CFS sections with improved buckling and torsional properties due to the restraints provided by thinlayered ECC. This paper investigated the shear performance of the new composite CFS/ECC section. Twenty-eight simply supported beams, with a shear span-to-depth ratio of 1.0, were assembled back-to-back and tested under a 3-point loading scheme. Bare CFS, composite CFS/ECC utilising ECC with Polyethylene fibres (PE-ECC), composite CFS/MOR, and CFS/HSC utilising high-strength mortar (MOR) and high-strength concrete (HSC) as replacements for PE-ECC were compared. Different failure modes were observed in tests: shear buckling modes in bare CFS sections, contact shear buckling modes in composite CFS/MOR and CFS/HSC sections, and shear yielding or block shear rupture in composite CFS/ECC sections. As a result, composite CFS/ECC sections showed up to 96.0% improvement in shear capacities over bare CFS, 28.0% improvement over composite CFS/MOR and 13.0% over composite CFS/HSC sections, although MOR and HSC were with higher compressive strength than PE-ECC. Finally, shear strength prediction formulae are proposed for the new composite sections after considering the contributions from the CFS and ECC components.

Synthesis and evaluation of silver nanoparticles loaded with Gemini surfactants: Surface and antimicrobial activity

Nabel A. Negma,Ali A. Abd-Elaal,Dalia E. Mohamed,Ahmed. F. El-Farargy,Sara Mohamed 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-

Silver nanoparticles loaded by three Gemini cationic surfactants having different spacer chain length were prepared and characterized using ultraviolet–visible (UV–vis) absorption spectroscopy and transmission electron microscope (TEM) analysis. TEM analysis showed the homogeneity and stability of the formed silver nanoparticles in the presence of the Gemini surfactants. The results showed increased activity of the silver nanoparticles in the presence of the Gemini cationic surfactants. Antimicrobial results of inhibition zone diameter and minimum inhibitory concentration were correlated to Gemini surfactants and their nanoparticles including surface activity and tendency toward adsorption at interfaces

Enhancement the detection of Ni2+ and Zn2+ ions using nanostructure of synthesized dithiol surfactants with gold nanoparticles

E.M.S. Azzam,A.F.M. El-Farargy,Ali A. Abd-Elaal 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

Here in, the nanostructure of dithiol surfactants were synthesized with gold nanoparticles (AuNPs). The nanostructure of these surfactants was investigated using FTIR, UV, XRD, and TEM techniques. The surfactants under investigation show good ability for assembling on AuNPs. The alkyl chain length shows strong effect on the stabilization of the nanostructure of these surfactants. The detection of Ni2+ and Zn2+ ions in water solution was investigated using UV spectrophotometer. The data show that the sensitivity of the nanostructure of surfactants towards the detection of Ni2+ and Zn2+ ions is more than that of the individual surfactants.

Corrosion inhibition and Biocidal effect of some cationic surfactants based on Schiff base

새미사반,Atef Saied,AHMED SALAH MAHMOUD TAWFIK,A. Abd-Elaal,Ismail Aiad 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6

The three cationic surfactants based on Schiff base were laboratory prepared, (E)-decyl-4-[(2-hydroxyethylamino) methyl]-N,N-dimethyl benzenaminium bromide (I), (E)-dodecyl-4-[(2-hydroxyethylamino)methyl]-N,N-dimethyl benzenaminium bromide (II) and (E)-hexadecyl-4-[(2-hydro-xyethylamino)methyl]-N,N-dimethyl benzenaminium bromide (III) were evaluated as corrosion inhibitors for carbon steel in acid medium and antimicrobial agents against sulfate reducing bacteria,SRB. Three techniques were used for the corrosion inhibition evaluation, namely; weight loss,polarization and electrochemical impedance. The serial dilution method was used to evaluate the inhibiting effect of these compounds on the sulfate reducing bacteria growth. The results showed that the prepared compounds have good antimicrobial activities against the SRB as well as they have high efficiency as corrosion inhibitors for carbon steel in 1 M HCl.