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.
We have reported the synthesis of mesoporous titania with crystalline walls using hexadecyltrimethylammonium bromide (CTAB), a typical cationic surfactant, as a template and titanium sulfoxide as a reactant in aqueous solution (Shibata et al., 2005 [1]). In this study, the removal method of CTAB from the mesopores without calcination or collapsing the ordered porous structure is described. First,...
Four novel thiourea-based non-ionic surfactants, 1-decanoyl-3-phenylthiourea, 1-decanoyl-3-ethylthiourea, 1-butyl-3-decanoylthiourea and 1-cyclohexyl-3-decanoylthiourea were synthesized from readily available synthetic building blocks in high yield. The compounds were characterized by 1 H NMR, 13 C NMR, FTIR and UV–Visible spectrophotometry. These surfactants show very low solubility...
Palladium nanotubes were prepared by using silver nanowires as the template, which were prepared in a modified polyol reduction process. The morphology and structure of silver nanowires and palladium nanotubes were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electrochemical experimental data showed that palladium nanotubes...
We developed an environmentally friendly, one-pot strategy toward preparation of Ni nanoparticles-decorated reduced graphene oxide (Ni-RGO) hybrids, through the use of ethylene glycol as both solvent and reducing agent under solvothermal conditions. Several analytical techniques were used to characterize the resulting Ni-RGO hybrids, which showed that the monodispersed Ni nanoparticles with average...
The effects of pH on the initial shear thinning and subsequent thickening behaviors of fumed silica suspensions with increased shear rate were investigated. The critical shear stress observed at the onset of the shear thickening of suspensions can be tuned through the pH of added aqueous solutions. The increase in pH of the addition shifts the onset of shear thickening to higher shear stresses. This...
Measurements of the surface tension of the aqueous solutions of sodium dodecylsulfate (SDDS) and p-(1,1,3,3-tetramethylbutyl)phenoxypoly(ethylene glycol) (Triton X-100 or TX-100) mixture with methanol, ethanol or propanol were carried out in the whole range of alcohol concentration and in the range of the surfactant mixture concentration from 1×10 −5 to 5×10 −3 M. On the basis of the...
The properties of Langmuir monolayers and Langmuir–Blodgett as well as Langmuir–Schaefer films formed by two open-cage polyhedral oligomeric silsesquioxanes (POSS): 1,3,5,7,9,11,14-hepta-isooctyltricyclo [7.3.3.15,11] heptasiloxane-endo-3,7,14-triol (TSiO-POSS) and 1,3,5,7,9,11-octaisobutyltetracyclo [7.3.3.15,11] octasiloxane-endo-3,7-diol (DSiB-POSS) were studied. Both compounds were shown to form...
A robust rough titanium dioxide (TiO 2 ) surface was prepared by acid treatment of a Ti plate and mesh. By ultraviolet (UV) irradiation, the surface exhibited superhydrophilicity and superoleophilicity in air and underwater superoleophobicity. Due to the rough surface, the underwater superoleophobicity was observed, even after dark storage for 1 week under the ambient atmosphere. The robust...
The self-aggregation (micellization) of surfactants in the bulk in relation to their adsorption at the air/water interface has been analyzed and discussed. In this respect, the thermodynamic rationales of Traube, and Rosen and Aronson have been considered and analyzed at length. The first deals with adsorption at low surface pressure, the second hypothetically deals with concentration close to the...
Streaming potential measurement is one of the most frequently used characterization methods of polyelectrolyte multilayer films. In most cases, the adsorption of a polyelectrolyte occurs up to an overcompensation of the surface charge. Herein, we generalize previous findings that the obtained streaming potential (transformed into a relative ζ potential) is dependent on the history of the measurement...
In the presence of graphene oxide (GO) substrate, nanostructured graphene-SnO 2 -polyaniline (GSP) ternary composite is synthesized via one-pot method, including that GO is reduced by Sn 2+ and tiny SnO 2 nanoparticles are homogeneously distributed on the graphene sheets and following that polyaniline (PANI) is in situ synthesized on the surface of graphene-SnO 2 (GS)...
Magnetofluorescent nanocomposites (MFNCs) providing a single nanoscale platform with multimodal properties are gaining momentum in biological manipulation, biomedical imaging and therapies. In this work, we report the preparation of MFNCs integrating MnFe 2 O 4 magnetic nanoparticles (MNPs), CuInS 2 /ZnS quantum dots (QDs) and poly(ethylene glycol)-b-poly(lactide-co-glycolide)...
Hybrid-silica materials containing octyl, phenyl and urea-propyl functional groups were reported. These functionalized silicas were prepared by a via one-pot synthesis method through co-condensation of tetraethyl ortosilicate with organosilanes co-precursors. The obtained materials were analyzed by a number of techniques including scanning electron microscopy, Fourier transform infrared spectroscopy,...
Swelling/deswelling properties of core–shell nanoparticles play an essential role in determining the stability of colloidal suspensions. Desolvation of polymers chains induced by variation of pH, temperature and/or ionic strength increases their lyophobicity favoring aggregation. Knowledge of the hydrophilic character of the surface layer against external stimuli enables the prediction of the aggregation...
Nanographite oxide prepared by a chemical oxidation method was characterized by SEM, XRD, FT-IR, zeta potential and BET surface area. The use of nanographite oxide as an adsorbent to remove p-nitrophenol from aqueous solutions was investigated. Adsorption experiments were carried out as a function of the contact time, initial p-nitrophenol concentration, pH, adsorbent dosage, and temperature. It was...
Rheological behavior of carrot oil emulsions thickened with variable concentrations of carboxymethylcellulose at dynamic and oscillatory have been investigated. Among the prepared materials, the emulsion containing 0.6wt.% of thickener was found to be most stable as confirmed by minimal changes of dispersion index within the examined storage period and by rheological tests. Emulsions with uniform...
Biocompatible non-aqueous emulsions, stabilized by a well-defined poly(butadiene)-poly(2-vinylpyridine)-poly(ethylene oxide) (PBut-P2VP-PEO) triblock copolymer, were developed for the system glycerine ester (Miglyol 812) dispersed in polyethylene glycol (PEG 400). One of the most attractive features of this copolymer is its capacity to form, by hydrogen bonding, thermoreversible micellar systems in...
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.