Ahmida el achari

Ahmida el achari
Ecole d'ingénierie et d'innovation textile | ENSAIT · ge

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56
Publications
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Publications

Publications (56)
Article
A novel colorimetric and fluorescent coumarin hydrazone probe L was prepared by condensing 7-(diethylamino)-coumarin–3-carbaldehyde and (thiophen-2-ylmethyl) hydrazine. Absorbance and emission titrations show that probe L detects Hg2+ rather than other interfering cations. The colorimetric change from yellow to red and the decrease in fluorescence...
Article
cyanide ions has been synthesized and characterized. This probe comprises two coumarin sugar units linked by an ethylenediamine spacer. The chemosensor Lg exhibits selectively a quenched fluorescence in the presence of copper(II) cations, as well as a redshift of the absorbance at 380 nm. However, in the presence of other cations, Lg exhibits a str...
Article
Magnetite-silica-chitosan-amine nanoparticles were prepared for use as an effective adsorbent for the removal of nitrate and phosphate anions from an aqueous solution. The physical and chemical properties of the prepared composite were investigated by Fourier transform infrared (FT-IR), vibrating sample magnetometry (VSM), Brünauer, Emmett & Teller...
Article
A simple colorimetric water soluble chemosensor for Cu2+ and subsequent CN− anions sensing was designed and fully characterized. The chemosensor consisted of a two sugar pyrazolidine-3,5-dione derivatives linked by an ethylenediamine spacer. Colorimetric titration experiment of the presented probe reveals high selectivity and sensitivity toward Cu2...
Article
A novel coumarin-thiol chemosensor L for sequential colorimetric and fluorescent detection of mercury (II) and cyanide ions in aqueous solution has been designed and prepared. The probe L exhibits high selectivity and sensitivity towards mercury (II) cations, and forms the complex L/Hg2+ which exhibits red-shift and fluorescence quenching. In turn,...
Article
A novel colorimetric glyco-conjugated chemosensor for sequential detection of the copper (II) and cyanide ions in water has been developed starting from lactose pyrazolin-5-one derivative. The presented chemosensor revealed a high sensitivity and selectivity toward copper (II) and cyanide ions in water under competitive conditions in real samples....
Article
Novel water soluble triazene dyes based on glyco-conjugated pyrazolone amines were synthetized by using N-propyl-2-pyrrolidonium hydrogen sulfate supported on silica-coated magnetite nanoparticle as acid catalyst. This organic–inorganic hybrid composite showed an excellent catalytic activity toward diazotization reaction of pyrazolone amines perfor...
Article
A simple dye adsorbent based on polyethylene terephthalate – PET functionalised by chitosan‘Chit-Pet-T’ was developed to remove cationic (MG, CV) and anionic (SY, DB71, AY17) synthetic dyes from aqueous solutions. In the first part of this study, the surface of the non-woven PET material was activated by using an aqueous solution of NaOH (0.5 M), a...
Article
A novel fluorescent BODIPY-modified silica-coated magnetite nanoparticles/Copper (II) complex was developed for cyanide detection in aqueous ethanol solution. The sensing abilities of the prepared fluorescent copper (II) complex towards cyanide anions was examined by fluorescence spectroscopy, and displays high selectivity and sensitivity for cyani...
Article
Polyester (PET) was pre-activated by atmospheric air plasma and coated by various inorganic oxide nanoparticles (MOx) such as titanium dioxide (TiO2), zinc oxide (ZnO), and silicon oxide (SiO2), using poly(vinylidene fluoride) (PVDF) and chitosan (CT) as binders. The resulting PET-PVDF-MOx-CT composites were thermally compressed and then characteri...
Article
This work reports the design and functionalization of new composite-based Polyethylene terephthalate (PET) fibers with high anti UV radiation. Polyethylene terephthalate fibrous nonwovens were coated by oxide materials (OM) like titanium dioxide (TiO2), zinc oxide (ZnO) and silicon dioxide (SiO2). Chitosan (CT) and polyvinylidene fluoride (PVDF) po...
Article
Polyester (PET) was pre-activated by atmospheric air plasma and coated by various material oxide (MOx) such as titanium dioxide (TiO2), zinc oxide (ZnO) and silicon oxide (SiO2), using polyvinylidene fluoride (PVDF) and chitosan (CT) as binders. The resulting PET-PVDF-MOx-CT composites were thermally compressed and then characterized through scanni...
Article
In this work, polyester fiber (PET) were functionalized by oxides (Ox) like titanium dioxide (TiO2), zinc oxide (ZnO) and silicon dioxide (SiO2), using polyvinylidene fluoride (PVDF) as binder to obtain a PET-PVDF-Ox material. Chitosan polymer (CT) was further grafted as coating layer to improve the surface compatibility, resulting in the PET-PVDF-...
Article
A novel copper (II) chemosensor based on water soluble azoic dye with bipyrazolic tripod moiety has been synthesized. The spectroscopic data’s of the presented chemosensor and its complex formation with several metal ions are studied in water via colorimetric titrations. The obtained results show that the developed chemosensor presents a high selec...
Article
In this study, two polyester nonwovens PET1 and PET2 were functionalized and designed via grafting of PAMAM( NH⁠2)⁠4 as dendrimers (Dr) and 3-(aminopropyl)triethoxysilane (APTES) flowed by the incorporation of copper (Cu) and silver (Ag) nanoparticles, with the aims reducing toxic molecules, dissociated particles and bacteria. The obtained nonwoven...
Article
Full-text available
A novel functional polyester fabric (PF) was successfully prepared by a facile method. PF were coated by copper oxide (CuO) followed by chemical grafting of 3-chloropropyltriethoxysilane (ClPTES) and diethanolamine (DEA). The morphology and structure of the resulting material PF@CuO–Si–N(OH)2 was characterized by X-ray diffraction, scanning electro...
Article
Novel family of azoic dyes pyrazolone based were prepared by an efficient and rapid methodology through diazotization reaction of different pyrazolone amine derivatives, in the presence of acidic ionic liquid supported on silica-coated magnetite nanoparticles as acidic catalyst at room temperature and under solvent-free conditions. The attractive a...
Conference Paper
Heterocycles are an inescapable and integral feature of numerous diverse fields of chemistry. The organic dye chemistry is not an exception; heterocycles have been widely used in disperse dye chemistry. Recently, different eco-friendly synthetic methods were developed to prepare azoic dyes, and in this sense, an efficient and experimentally simple...
Article
Novel functionalized geotextiles were prepared through chemical functionalization of the polyethylene terephthalate (PET) non-woven material by chitosan by using a coating technique with sodium tripolyphosphate (TPP) as the cross-linking agent. The prepared functionalized geotextiles were characterized by using different surface analyses and they s...
Article
The present paper deals with the functionalization of polypropylene (PP) fibers with cyclodextrins (CDs) in the presence of polyacrylic acid (PAA) as a crosslinking agent. Evidence of modification was proved via the formation of a crosslinked polymer formed between PAA and CDs. This polymer physically adhered to the fiber network and was resistant...
Article
The present study focused on formation of chitosan (CS) droplets particles/microcapsules by ionic gelation method with sodium dodecylsulfate (SDS) for encapsulating linseed oil as active substance. Chitosan droplet particles with four alternate layers of CS and SDS were developed from oil in water emulsion using SDS as an anionic emulsifier. The pr...
Article
We report a simple colorimetric method based on a water soluble polymer (WSP) for the sensitive and selective detection of cyanide in a biological solution. The WSPs were prepared from a radical polymerization of a methacrylate with a cyanide chemosensor moiety based on a coumarin-dicyanovinyl derivative motif, and the polymer was then rendered wat...
Article
A novel ratiometric fluorescent sensor for copper II based on silica coated magnetite hybrid fluorescent material functionalized with boron-dipyrromethene containing a di (2-picolyl) amine was prepared and characterized. The binding abilities of the functionalized silica coated magnetite nanoparticles towards different metal ions have been examined...
Article
A novel fluorescent hybrid material for Hg2+detection using a derivative of dansyl fluorophore with azathia crown ether moiety grafted on silica nanoparticles (SiNPs) was prepared and characterized. The designed nanosensor exhibited pronounced Hg2+ selective ON–OFF type fluorescence switching upon binding. The presence of other metal ions has no ob...
Article
A novel mercury chemosensor based on water soluble fluorescent BODIPY probe with an azathia-crown ether moiety has been synthesised through condensation of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene as a fluorophore coupled at the 3-position to an azathia macrocycle via an ethenylphenyl linker. Spectroscopic properties and complex formation with se...
Article
Starch films containing a chemodosimeter probe based on a quinolinium merocyanine dye were successfully prepared and studied. Through the selective nucleophilic addition reaction between cyanide anions and the dye chromophore the film can selectively detect sub-micromolar quantities of cyanide ion by a distinct color change.
Article
Several substituted triazenes dyes were synthesized by coupling functionalized pyrazolidin-3,5-dione derivatives, to various heteroarene azides in in excellent yields (98%). Electron delocalization between the two coupled components of these triazene dyes were studied using UV-vis spectra and NMR spectroscopy. Their thermolysis were investigated an...
Article
Full-text available
The aim of this work was to improve the hemocompatibility and the selectivity according to cells of non-woven poly(ethylene terephthalate) (PET) membranes. Non-woven PET membranes were modified by a combined plasma-chemical process. The surface of these materials was pre-activated by cold-plasma treatment and poly(acrylic acid) (PAA) was grafted by...
Article
A simple water-soluble aldehyde functionalized chromone 5 was utilized as a doubly activated Michael acceptor type of chemodosimeter for cyanide in water. The water solubility of the probe 5 is due to the incorporation of two glycerol units on the starting prepared chemodosimeter. This sensory system is able to selectively distinguish cyanide among...
Article
The synthesis of two new water soluble azo dyes and their optical response to different anions is reported herein. Solution studies in water indicate that cyanide induces a colour change in these dyes, whereas no changes are observed in the presence of other anions, such as View the MathML source In the second part of the paper, we report the incor...
Article
The nucleophilic nature of cyanide is used to develop a simple, sensitive, and highly effective sensor. Azo dye 6a based on 2-(trifluoroacetamide) benzhydrol-2 (2-TFAB) as anions receptor, presents a new way to build molecular color sensors for cyanide in water. The 2-TFAB moiety of the dye 6a is used as receptor group for cyanides and linked direc...
Article
A new selective chemodosimeter probe of cyanide anions in aqueous media was developed by the introduction of a simple glyco-conjugated o-(carboxamido) aldehyde hydrazone into an azo dye as chemodosimeter that recognizes cyanide anions among other competing anions such as acetate, dihydrogen phosphate, fluoride through reversible covalent bonding. T...
Article
Full-text available
Polypropylene (PP)-knitted fabrics were finished with β-cyclodextrin (β-CD) and crosslinked with citric acid (CTR). The polyCTR–β-CD polymer-coated fibers were wash resistant. We report that the rate of immobilized CD was controlled by temperature and curing time. The weight increase of the fabrics after modification with native β-CD and CTR reache...
Article
This study describes the use of cyclodextrins (CDs) as a finishing agent of polyamide (PA) fibers used in order to obtain inguinal meshes with improved antibiotic delivery properties. The finishing process involved polymerization between citric acid and CDs, which yielded a cross-linked polymer that physically adhered to the surface of PA fibers. T...
Article
We present the study of the cyclodextrin (CDs) finishing of polyamide fibers (PA) by means of citric acid (CTR) as crosslinking agent. We observed that the mode of grafting happened by the formation of a crosslinked polymer formed between CTR and CDs. This polymer physically adhered to the fibers network and was resistant to hot water washings. Mod...
Article
Polyamide fibers were modified for the attainment of antibacterial activity using a graft copolymerization method. The fibers were grafted with monomers containing quaternary ammonium groups using sodium persulfate as initiator. Two monomers were used as vinyl monomers. The first monomer, called METAC, is methacryloyloxyethyl trimethylammonium chlo...
Article
Full-text available
Graft copolymerisation of methacryloyloxyethyl trimethyl ammonium chloride monomer {H 2 C=C(CH 3)CO 2 CH 2 CH 2 N(CH 3) 3 Cl} (METAC) onto polyamide knitted fabrics using sodium persulfate as initiator has been investigated. The contents of METAC (quaternary ammonium groups) on polyamide fabrics are extremely valuable for further surface modificati...
Article
The reactivity under UV light and at room temperature of two series of photo-crosslinkable silicone polymers containing pendant cinnamic or α-cyano-β-styrylacrylic† (CSA) esters was examined by means of UV spectroscopy. Two types of behaviour were evidenced on the basis of qualitative spectrum observation and quantitative measurements of reaction r...
Article
The Hofmann modification of polyacrylamide to yield vinylamine homo- or copolymers was reinvestigated in order to determine the real scope of a procedure of great potential interest in polymer chemistry. The conditions of the treatment by sodium hypochlorite followed by concentrated sodium hydroxide at low temperature (0°C) were adjusted to avoid o...
Article
Grafting polyester monofilaments with perfluorooctyl-2 ethanol acrylic monomer (C8F17–C2H4–O–CO–CHCH2)/ stearyl methacrylate monomer (CH3(CH2)17–O–CO–(CH3)CCH2) mixture was carried out with the aim of improving water and oil repellency and soil resistance. The percent grafting and the grafting rate depended upon the monomer concentration, the ini...
Article
Polyamide-6 (PA-6)/clay (modified montmorillonite) hybrid was synthesized by melt blending at high shear stress. 27Al-NMR of solid state shows that the clay is not modified after melt blending. Using wide-line 1H-NMR and TEM, it is demonstrated that the nanocomposite exhibits mainly an exfoliated structure. It is shown that the modified montmorillo...
Article
Graft copolymerisation of perfluorooctyl-2 ethanol acrylic monomer/stearyl methacrylate monomer mixture onto poly(ethylene terephthalate) fibers using benzoyl peroxide as initiator was carried out in order to improve water repellency. By characterising the surface free energy, the degree of water repellency can be evaluated. In this article, the Wi...
Article
This part of the series presents an analysis of stick-slip motion during sliding of two crossed, sized, glass fibers on the basis of experiments with an electronic microbalance as described in Part I. The vertical movement of a fixed horizontal fiber generates a discontinuous or stick-slip motion of the vertical fiber linked to the microbalance. A...
Article
Lateral force microscopy (LFM) and an electronic microbalance method are used for a friction force analysis of sized glass fibers, which are generally used to reinforce com posite materials. Friction coefficients of glass fibers A and E, coated with sizes containing a starch and an epoxy film former, respectively, are determined. Friction force val...
Article
Full-text available
By using atomic force microscopy (AFM)/lateral force microscopy (LFM), a comparative study of the topography as well as the tribological properties (at a micrometer scale) of sized E-glass fibers was done. Normal and lateral deflection signals are recorded when an AFM tip scans a fiber surface. Friction force data were obtained from the forward and...
Article
This study has been achieved on industrial products (glassfibres coated with different sizings). Contact angle measurements and contact angle hysteresis were obtained with three liquids (glycerol, tricresylphosphate and mineral oil). Fibres are perfectly wetted with tricresylphosphate and mineral oil contrary to glycerol. For this last liquid a lar...
Article
Vinylamine copolymers prepared by the Hofmann reaction were functionalized by amidification with cinnamoyl chloride. The resulting photosensitive polymers, which are the nitrogen analogues of poly(vinylcinnamate), can be prepared with various contents of cinnamamide side groups. The polymers exhibit a marked hydrophilicity and undergo efficient cro...
Article
To better understand certain physical behaviors of glass fibers used to reinforce a polymer matrix (in composite materials), it is necessary to know their topography. In this paper, E glass fibers are studied using atomic force microscopy (AFM) and scanning electronic microscopy (SEM). To compare three different kinds of fibers (uncoated or virgin...

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