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The kinetics of gelation and flow properties of fumed silica suspensions were investigated in pure water and a water/glycerol mixture, as a function of temperature and pressure. In pure water, the gelation time was determined by following the evolution of the storage and loss moduli versus time at several frequencies and temperatures between 18 and 35°C. Increasing the temperature increased the aggregation...
The adsorptive voltammetric behaviour of tinidazole onto the HMDE was investigated and validated in solubilized system and biological fluids by CV, SWCAdSV and DPCAdSV. Addition of CTAB to the solution containing drug enhanced the peak current while anionic and non-ionic surfactants showed an opposite effect. The electrode process is irreversible and adsorption controlled. Various chemical and instrumental...
Different chemical reagents (phosphoric acid, boric acid, ammonium citrate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, disodium hydrogen phosphate and trisodium phosphate) were employed to develop activated carbon cloths (ACC) by chemical activation of a lyocell precursor, in an attempt to explore their effect on main physico-chemical characteristics and electrical behaviour of the...
Sorption of Eu(III) by silica from aqueous solutions of varying pH (4.0–8.0), fixed ionic strength of 0.1M (NaClO 4 ) and at room temperature has been studied by batch sorption experiments as well as time resolved fluorescence spectroscopy (TRFS). The percentage sorption of Eu(III) (5.0×10 −5 M) by silica was found to increase with the pH of the suspension and remaining close to 100%...
Coagulation is an effective pre-treatment process in membrane filtration for recycling spent filter backwash water (SFBW). To optimize the operation of the coagulation/filtration process for SFBW recycling, it is important to understand the critical role of coagulation mechanism on membrane filtration. In this study, SFBW samples were coagulated with polyaluminum chloride (PACl), followed by a dead-end...
The photocatalytic degradation of hazardous dye Tropaeoline 000 has been investigated over anatase TiO 2 photocatalyst irradiated with a UV light. The effect of operational parameters i.e. dyes concentration, catalyst concentration, pH, temperature and electron acceptor hydrogen peroxide (H 2 O 2 ) on the degradation rate of aqueous solution of dye has been examined. Results...
Colloidal multilayer structures of silica microspheres have been developed on the quartz substrates using vertical deposition technique and effect of annealing on optical properties of samples was investigated using UV–Visible spectroscopy. It is noticed that forbidden photonic band gap is a function of annealing temperatures and annealing times. Morphology of particles was characterized using scanning...
Surfactant–alcohol systems are not uncommon in colloidal chemistry, what is rare is a specific emphasis on the environmental sensitive behaviour of 1-butanol (C 4 OH) in different surfactant solutions. Intermediate solubility of C 4 OH (in between totally soluble short chain alcohol and partially miscible long chain alcohol) has prompted us to study its partitioning between bulk and...
Reliable prediction of the heterogeneous solid adsorbents pore size distribution (PSD) is the key element in the design and operation of all adsorption processes. Direct measurement of PSD is usually expensive and in many practical applications may not be feasible. Complex theories and sophisticated models are required to obtain a faithful estimation of PSD from a set of noisy measured isotherms....
Polyaniline–silver (polyaniline/Ag) nanocomposite was prepared by an ultrasound assisted in situ miniemulsion polymerization of aniline along with different loading of silver nanoparticles. Colloidal silver nanoparticles were synthesized by reduction of silver nitrate (AgNO 3 ) with sodium borohydride (NaBH 4 ) using sodium dodecyl sulfate (SDS). Films of Polyaniline/Ag were casted...
Extended Langmuir model is a model which correlates the surface tension data with bulk composition. One of main objectives of this model is considering the surface as a thin layer of finite depth. In the present work by combination of the Gibbs equation with extended Langmuir model and making some assumptions a new and simple equation was derived for estimating the depth of surface thin layer of dilute...
The structure of Gemini surfactants makes them potentially useful candidates in terms of their performance, particularly in mixed micelles for different surfactant applications. We have studied mixed micellization and surface properties of binary mixtures of cationic Gemini pentanediyl-1,5-bis(dimethylcetylammonium bromide) (G5, 16-5-16) with conventional cationic cetylpyridinium chloride (CPC), anionic...
Tunable poly(4-vinylpyridine) (p(4-VP)) nanoparticles were synthesized in an oil-in-water emulsion using ethylene glycol dimethacrylate (EGDMA) as the cross-linker and ammonium persulfate (APS) as the initiator. The modification of p(4-VP) particles with N-alkyl quaternization was carried out through reacting with various quaternization agents containing carbon chains of various lengths, such as HCl,...
The study of the aging of synthetic pyrogenic silicas, in the presence of a water containing atmosphere was led on two pyrogenic silicas, having respectively a specific surface area of around 200m 2 /g (N20) and 300m 2 /g (T30) were aged under a relative humidity (RH) of 94% at 25°C. The evolution of their surface properties was followed by gravimetry and immersion microcalorimetry...
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