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In this paper we propose, characterize and test a surfactant formulation, consisting of a branched polyoxyethylene type commercial non-ionic surfactant (Igepal CA520), n-hexane and water, for use in CO 2 dry-cleaning to enhance the removal of particulate soil. In the formulation lamellar mesophases L α coexist in an L 2 microemulsion (reverse micellar) phase. We hypothesize...
A facile method to prepare metallic platinum doped ordered mesoporous titania–silica materials (Pt–TiO 2 /SiO 2 ) was demonstrated by using P123 as the soft template. The materials exhibited anatase and rutile biphase with the ratio of 63:37; meanwhile, they possessed 2D hexagonal p6mm structure with large pore size and high surface area. Pt–TiO 2 /SiO 2 materials were...
Van der Waals (vdW) and electrostatic double layer (EDL) interactions between a sphere and a cylinder are determined using the surface element integration (SEI) technique. Compared with Derjaguin approximation, the SEI technique gives more accurate predictions for the EDL interaction between a sphere and a cylinder. However, the SEI technique slightly overestimates the vdW interaction compared with...
The unique physicochemical properties of silver nanoparticles (AgNPs) give them the potential to be useful in various applications such as sensors, catalysts, and sterilizers. Among the nano-consumer products registered in Woodrow Wilson Center (i.e., inventory of nanotechnology-based consumer products), AgNPs are the most applicable material in the commercial market. To apply AgNPs in nano-consumer...
Microbial fuel cells (MFCs) as one type of “green” energy source are drawing great attention among researchers. Anode performance is an important factor limiting the power output of MFCs for practical application. In this paper, the gold nanoparticles (Au NPs) modified carbon paper electrode was successfully constructed by layer-by-layer assembly technique for the first time. UV–vis spectroscopy was...
The interaction between negatively charged nanocrystalline cellulose (NCC) and a cationic surfactant, tetradecyl trimethyl ammonium bromide (TTAB) was examined by isothermal titration calorimetry (ITC), conductometric and potentiometric titrations and surface tensiometry. The interaction is controlled by electrostatic and hydrophobic interactions. ITC and surface tension measurements confirmed the...
Kinetics of the interfacial step polymerization in direct miniemulsion between 1,6-hexanediol and isophorone diisocyanate, at different temperatures and with different organic solvents as dispersed phase was investigated. Despite the complexity of the reaction system due to the specific experimental conditions, the profiles of consumption of the isocyanate groups and diisocyanate monomer, and the...
This study presents the fabrication and characterization of novel cerium oxide–titanium dioxide (Ce 2 O 3 –TiO 2 ) composite nanofibers and their bactericidal activity. The utilized Ce 2 O 3 –TiO 2 nanofibers were prepared by electrospinning of a sol–gel composed of cerium nitrate hexahydrate, titanium isopropoxide and poly(vinyl acetate). The physicochemical...
The synthesis of colloidal SiO 2 nanoparticles was achieved via the base-catalyzed hydrolysis and polycondensation of tetraethyl orthosilicate (TEOS) in an alcoholic medium with the careful variation of the concentrations of water, ammonia and TEOS. In this study, we investigated the influence of experimental parameters on the average size of nanoparticles by means of a multivariate statistical...
In this paper, it is proposed to study the deposition of nanoparticles by electrophoretic deposition (EPD) inside a porous anodic aluminum oxide film. Despite the presence of a highly resistive barrier layer at the metal-anodic film interface, porous anodic films on AA 1050A were successfully filled by 16-nm, surface modified silica particles. During this study it was shown that both the colloidal...
The interfacial behavior and micellization of the mixture of surfactin (a powerful biosurfactant) and a commonly used synthetic surfactant, sodium dodecylbenzenesulphonate (SDOBS), have been investigated. The adsorption of the two surfactants from the liquid phase into the air–liquid interface resulted in the formation of a mixed interfacial monolayer with a mole fraction of the biosurfactant as 0...
Due to the special properties of nano particles for applications in textile processing and concern of wool fineness, a novel method is introduced in this research to modify the coarse wool fineness along with synthesis of nano silver to impart antibacterial properties on wool. Moreover, two diverse reducing agents with various concentrations are employed with different concentrations of silver nitrate...
Herein we report colloidal dispersibility of concentrated suspensions containing fatty acid-capped iron nanoparticles and its influence on the static and dynamic magnetorheological (MR) response. The amount of fatty acid absorbed on the surface controls the non-field dispersion state as well as weakly and strongly flocculated structure of the nanoparticles. Both yield stress at B=0.5T of an applied...
The interaction of sodium carboxymethylcellulose (NaCMC) and cationic gemini surfactants (16-s-16, s=5, 6)/conventional surfactant (CTAB) in aqueous solutions is investigated by conductivity, fluorescence and viscosity techniques. Electrostatic and hydrophobic interactions play a dominant role in such systems. The conductivity results showed that the geminis interact strongly with NaCMC as compared...
Shape evolution of gold nanoparticles in seeding approach in which 25nm citrate capped gold dots were used as the seeds and the mixtures of tetrachloroauric acid and sodium citrate as the growth solutions was investigated systematically and quantitatively. The citrate capped gold nanoparticles presented shape evolution from dot-shaped to tadpole-like, dumbbell-shaped and rod-like along the reaction...
Seven chemically designed monolayer compounds were synthesized and investigated with comparison to the properties and water evaporation suppression ability of 1-hexadecanol and 1-octadecanol. Increasing the molecular weight and polarity of the compound headgroup drastically altered the characteristics and performance of the monolayer at the air/water interface. Contrary to the common expectation the...
This study investigates the effect of two alkali metal cations (Li + , K + ) on the adsorption of high-molecular-weight, nonionic polyacrylamide on glass surfaces using a colloidal force probe. The effect of two different anions (Cl − , NO 3− ) on polymer adsorption is also presented. There is a general consensus that hydrogen bonding is the main mechanism by which...
We report the development of a method of the breath figures self-assembly, allowing manufacturing of micro-scaled porous hydrophobic/oleophilic polymer surfaces. The stainless steel gauzes were used as carrying frameworks for polymer honeycomb reliefs resulting from the breath figures self-assembly. Two very different kinds of polymer reliefs arose from non-woven large aperture and micro-scaled woven...
Properties of polyelectrolyte–surfactant complexes obtained by template polymerization of an ionic monomer in a micellar solution of an oppositely charged surfactant were studied using nephelometric turbidity measurement, polyelectrolyte titration and dynamic light scattering. It was shown that their properties differ from properties of polyelectrolyte–surfactant complexes obtained by mixing of solutions...
Hybrid multilayer films composed of poly(ethylenimine) and sandwich-type silicotungstates, K 13 [Ln(SiW 11 O 39 ) 2 ] (Ln(SiW 11 ) 2 ), Ln 3+ =Eu, Tb, Dy, were prepared on glassy carbon electrodes, quartz and glass slides using the electrostatic LbL self-assembly method. The film build up, monitored by electronic spectroscopy, showed a regular...
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