The solution and interfacial behavior of surfactant mixtures was investigated using a cationic surfactant, tetradecyl trimethyl ammonium chloride (TTAC), and a nonionic surfactant, pentadecylethoxylated nonyl phenol (NP-15), with alumina as the substrate. The cationic TTAC adsorbed at the alumina-water interface as a result of electrostatic attraction at pH approximately 10 whereas the nonionic...

Control of nonspecific protein adsorption is very important for the design of biocompatible and biomimetic materials as well as drug carriers. Grafted polymer layers can be used to prevent protein adsorption. We have studied the molecular factors that determine the equilibrium and kinetic control of protein adsorption by grafted polymer layers. We find that polymers that are not attracted to th...

The differential adsorption heats of oxygen and NO, as well as catalytic oxidation behavior during NO oxidation and NO2 dissociation reactions over supported Pt-catalysts, were investigated by microcalorimetric measurements. The average heat of adsorption (∆H) of oxygen ranged from 310 kJ/mol at 200 ̋C to 289 kJ/mol at 400 ̋C. Over this temperature range formation of platinum oxides and coverag...

With a density functional theory method, we studied computationally the size dependence of adsorption properties of metal nanoparticles for CO as a probe on Pd(n) clusters with n = 13-116 atoms. For large particles, the values slowly decrease with cluster size from the asymptotic value for an (ideal) infinite surface. For clusters of 13-25 atoms, starting well above the asymptotic value, the ad...

in the present study seven synthetic polymers were used as adsorbents for the removal of cd(ii) from aqueous solution. the equilibrium studies were systematically carried out in a batch process, covering various process parameters that include agitation time, adsorbent dosage, and ph of the aqueous solution. the analyzing system was an atomic absorption spectrometer (perkin-analyst 100). it was...

With the recent development of biomaterials and biodevices with reduced dimensionality, it is critical to comprehend protein adhesion processes to nanoscale solid surfaces, especially those occurring in a competitive adsorption environment. Complex sequences of adhesion events in competitive adsorption involving multicomponent protein systems have been extensively investigated, but our understa...

The ability of purified multi-walled carbon nanotubes (MWCNTs) to adsorb diclofenac and triclosan in aqueous solutions was examined by equilibrium, kinetic, and thermodynamic parameters. The results of SEM image, BET specific surface area, XRD, TGA, and FTIR spectra indicated that the characteristics of MWCNTs were improved after purification with nitric acid. Batch experiments illustrated that...

We present a generalized crossover (GC) model for the excess adsorption of pure fluids at a flat solid-liquid interface, which reproduces scaling behavior of the excess adsorption in the critical region and is reduced to the classical, van der Waals-type analytical model far away from the bulk critical point. In developing this model, we used the density-functional theory (DFT) approach for the...