Improving the hydrogen ab- and desorption kinetics in complex hydrides is essential if these materials are to be used as reversible hydrogen storage media in the transport sector. Although reductions in particle size and the addition of titanium based compounds have been found to improve the kinetics significantly, the physical understanding remains elusive. Density functional theory is used to...

Sorption-desorption and moisture accumulation tests are simple and quick methods for the in vivo functional analysis of stratum corneum hydration kinetics. The aim of this study was to evaluate the hydration dynamics of the uninvolved and affected skin of children with atopic dermatitis and to compare them with the skin of healthy children. The study investigated 45 children. The dynamic tests ...

The previously-obtained and characterized hybrid pectin-based beads containing agar-agar and guar gum, as well as sole pectin beads (P, for comparison) were examined for zinc ions sorption and desorption properties. The sorption kinetics and equilibrium in the studied system was described by two kinetic models (pseudo-first- and pseudo-second-order) and two isotherms (Langmuir and Freundlich), ...

Isotherms for the adsorption of KCl in PVOH-borate hydrogel was studied at 303 K by determining the amount of potassium and chloride ions adsorbed in PVOH-borate hydrogel using ion exchange chromatography and potentiometric titrations respectively. Experimental data was tested for Frendulich’s, Langmuir’s, Temkin’s and Dubinin–Radushkevich isotherms equations. The adsorption data follows isothe...

CO2 sorption–desorption cycles with a methyldiethanolamine (MDEA)/piperazine (PZ) blend have been performed rotoevaporator. Similar to other separation technologies, the heating involved in MDEA/PZ solvent regeneration is most energy-intensive step overall process. Thus, this study investigated desorption kinetics under low-pressure (<200 mbar) and low-temperature conditions range from 308 3...

The behaviour of E.coli are expressed in several conditions, the kinetics of E.coli are expressed by the formation characteristics in the study location, the rate of retardation are not left behind, it is express in the system, because it has a reflection on the formation variation in the study area.. Retardation factor are considered because of it influences from formation characteristic in th...

[1 ] D.A. Edwards, H. Brenner, Darsh T. Wasan, Interfacial transport processes and rheology. Butterworth { Heinemann Boston, 1991. [2 ] Ivan Ivanov, Interfaces, foams and emulsions, Course notes, 1994 (unpublished). [3 ] A.K. Malhatori and D.T. Wasan, E ect of surfactant adsorption { desorption kinetics and interfacial rheological properties on the rate of drainage of foam and emulsion lms. Che...

We carried out a molecular modeling study of an important reaction in the combustion of nitrogen-containing chars, the evolution of nitric oxide, (CNO)!NO+(C*). Density functional theory at the B3LYP level was used to provide potential energy surface information and transition state theory was used to provide temperature dependant rate constants. Desorption of NO from nitrogen-containing carbon...

general results a r e similar : The characteristic lengths of helicity a r e larger than those of the energy, and the helicity again oscillates between positive and negative values at all smaller scales. The data at 1 AU were taken in a s t ream interaction region13 and included both slow stream and fast stream intervals. Thus these results suggest that there is nothing atypical in the data sho...

Adsorption and desorption kinetics of Hg(II) on four soils at pH 6 were investigated to discern the mechanisms controlling the retention and release reaction rates of Hg(II) on soil. A stirred-flow method was employed to perform experiments. Apparent adsorption and desorption rate coefficients were determined by a one-site second-order kinetic model. Both adsorption and desorption were characte...