The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Many textiles have been often used in marine environments for a wide variety of purposes. Consequently, effective and clean methods to prevent biofouling in these textiles are needed. In this study, a nylon mesh doped with AgI was examined for its antifouling performance. The nylon mesh was iodinated with an iodine–potassium iodide aqueous solution and subsequently immersed in silver nitrate solution...
Partially substituted birnessite with Fe, Co, Ni and Cu for Mn was exfoliated to form nanosheet colloid and then their electrochemical properties were examined. The partially substituted birnessite can be exfoliated by tetrabutylammonium hydroxide acetonitrile solution. The electrodeposited films was grown from the exfoliated acetonitrile solution. The electrochemical capacitance of the films once...
To understand the relationship of molecule structure and dispersion mechanism, the influence of linear polycarboxylate-type superplasticizers on the adsorption properties and rheological behavior of ceramic suspension were carried out in this study. Experiments, measuring the static and dynamic viscosity of different polyelectrolytes and their rheological behavior in concentrated ceramic slurry, were...
The effect of pH, temperature and shear on the coagulation dynamics of a wood resin suspension destabilized by salt additions was investigated. Stability of wood resin colloids was measured as a function of time using a photometric dispersion analyser (PDA) upon the step addition of salt solutions. Colloidal stability upon salt addition was found to be a function of pH (directly related to colloidal...
Non-“seed-mediated” room temperature synthesis of gold multispiked nanoparticles has been successfully achieved by adding NaOH acting as an accelerator for the reduction of gold ions in ethylene glycol without adding any external reducing agent. The multispiked nanoparticles are obtained in high yield and good monodispersity with a mean diameter of 75±10nm. The absorption spectra of multispiked nanoparticles...
Population balance equation (PBE) models of emulsification processes allow the prediction of the drop size distribution, a critical determinant of emulsion properties. While many PBE models that account only for drop breakage have been developed for model emulsion systems with relatively low oil-to-surfactant ratios, industrial practice is to minimize surfactant use to reduce manufacturing costs and...
In this study, we systematically investigated the effects of sulfuric acid treatment on the physico-chemical and pore characteristics of halloysite. XRD results indicate that sulfuric acid will destroy the crystal structure of halloysite and finally turn it into amorphous silica. The acid will react with halloysite nanotubes from both inner and outer surfaces, dissolve the [AlO 6 ] octahedral...
We have investigated the formation of a viscoelastic wormlike micellar solution with natural-sourced materials such as sucrose monopalmitate (C 16 SE) and fatty acid (FA). Zero-shear viscosity of 10wt% aqueous solutions of C 16 SE and lauric acid (LA) increased with the increase in the C 16 SE fraction to a certain level but it decreased after a maximum value. Viscous solutions...
A sensitive electroanalytical method for determination of flutamide in pharmaceutical formulations has been investigated on the basis of the enhanced electrochemical response at polymer film modified carbon paste electrode in the presence of cetyltrimethylammonium bromide (CTAB). The reduction peak current increases in the presence of CTAB. The modified electrode exhibits catalytic activity, high...
During studying the distribution of pollutants between the aqueous and particulate phases, an anomalous C s -effect phenomenon, namely, the experimentally measured partition coefficient (K p ) value of a given system decreased with increasing the sorbent concentration (C s ), was observed in a number of adsorption systems. Classical Langmuir model cannot predict the C s...
Mixed Langmuir and Langmuir-Blodgett films of dissimilar components, arachidic acid and a phthalocyanine of zinc, have been investigated. These compounds form mixed films with phase separation, with domains at the sub-micro scale which are detected by AFM in LB films but not observed by BAM. These domains present different contrast in the surface potential images obtained with SP-AFM and in the friction...
The interaction between an Al 2 O 3 colloid and c-sapphire surface (0001) was investigated in an aqueous solution containing citrate ion, Cl − , NO 3− or Br − using the colloidal probe method. The force curve measured in electrolyte solutions at pH=4 showed a good agreement with the force curve predicted by the Derjaguin–Landau–Vervey–Overbeek theory at...
The yield stress and enthalpy of the wetting of silica–paraffin and kaolin–paraffin dispersions were measured as a function of the volumetric concentration θ of the dispersed colloidal powders after having performed a careful analysis of their macro–meso microstructure. The evolution and stability of the corresponding microstructure units is strongly linked to the shape of the τ 0 versus θ...
The influence of the bolaform salts in aqueous subphase, ethanediyl-α,ω-bis(ethyldimethylammonium bromide) (Bola2Et), alkanediyl-α,ω-bis(methyl dimethylammonium bromide) (Bolan, n=4, 6, 8) and alkanediyl-α,ω-bis(benzyldimethyl ammonium bromide) (Bolanph, n=2, 4, 6, 8), on the monolayer behavior of sodium hexadecyl sulfate (SHS) has been studied by Langmuir film balance technique. The NMR measurements...
In order to improve the dispersion of silica powder in polyurethane (PU), hyperbranched PU was introduced onto particle surface with coupled NCO-groups by one-pot condensation reaction of “A 2 +CB n ” monomers, a combination of commercially available 4,4-diphenylmethane diisocyanate (MDI) and diethanolamine (DEOA) or tris-(hydroxymethyl)aminomethane (TOAM). The incorporation of polymers...
The surface dilational rheological behaviors of two anionic surfactants with aromatic group in branch, sodium N-2-(phenoxy)-tetradecanolytaurinate (12+B-T) and sodium N-2-(2-naphthoxy)-tetradecanolytaurinate (12+N-T), were expounded by oscillating bubble method and interfacial tension relaxation method. The foam properties of both surfactants were also investigated by air flowing method. The results...
Interactions in aqueous solutions between a tetrameric naphthenic acid in sodium salt (BP10Na 4 ) and divalent Mg 2+ and Ca 2+ cations were investigated by isothermal titration calorimetry (ITC) and dynamic light scattering (DLS). Colloidal aggregation of the tetrameric sodium naphthenates to vesicles and micelles enhances its binding with divalent cations. In vesicle systems,...
Triglyceride surfaces were prepared by solidification from the melting of binary mixtures of trimyristin (MMM) and tripalmitin (PPP) with different mole fraction (x PPP ) to further investigate the formation mechanism of such super water-repellent surfaces. The hydrophobicity change of the MMM/PPP surfaces was monitored by the measurements on time-dependent contact angle. It has been found...
Aqueous mixtures containing a non-ionic surfactant (tetraethylene glycol monododecylether, C 12 E 4 ), an amphiphilic polymer (poly(sodium acrylate) hydrophobically modified with azobenzene groups randomly attached along the chains, HMPA) and 0.3M NaNO 3 were studied regarding the associations between macromolecules and surfactant assemblies (micelles or lamellar phases) at...
In this study we explored a possibility for enhancing aqueous sorption of humic substances (HS) onto hydroxylated surfaces (e.g., silica gel) by increasing modification rate of their most abundant functional groups – carboxyls with mineral-adhesive alkoxysilyl moieties. The synthesis included treatment of dried humic material with 3-aminopropyl trimethoxy silane (APTS) capable of forming amide bonds...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.