Претраживање
Приказ резултата 1-10 од 21
The role of surface defects in HOPG on the electrochemical and physical deposition of Ag
(Journal of the Serbian Chemical Society, 1999)
The role of defects on a substrate surface during the initial stages of nucleation and growth of Ag deposited electrochemically and physically on highly oriented pyrolytic graphite (HOPG) has been observed ex situ by ...
Conditioning of the filament for diamond deposition by hot-filament chemical vapour deposition method
(Journal of the Serbian Chemical Society, 1998)
A tungsten filament, 0.12 mm in diameter, was conditioned by heating in a mixture of methane and hydrogen of three different concentration ratios. The filament was heated by an electric current. The procedure was carried ...
Cretaceous-Tertiary boundary layer at Stevns Klint (Denmark): copper and copper(II) porphyrins
(Journal of the Serbian Chemical Society, 1999)
High concentrations (up to 4000 ppm) of copper(rr) porphyrins have been detected in the kerogen of the Cretaceous/Tertiary (KT) boundary informal type sediment, the Fish Clay, at Stevns Klint, Denmark. These pigments have ...
Influence of sodium dodecyl sulfate on the reaction between Nile Blue A and hydrogen peroxide
(Journal of the Serbian Chemical Society, 1999)
The influence of the anionic surfactant sodium dodecyl sulfate on the rate of the reaction between the cationic form of Nile Blue A and hydrogen peroxide was investigated in the pH range from 5 to 8.5. A retardation of the ...
Influence of the radioactive concentration of the in vitro stability of Tc-99m(Sn)-pyrophosphate
(Journal of the Serbian Chemical Society, 1999)
The in vitro stability of Tc-99m(Sn)-pyrophosphate solution was examined in dependence on the preparation conditions of the samples, the radioactive concentration of Tc-99m in the kit and the time elapsed after labeling. ...
Sol-gel derived silicon nitride powders
(Journal of the Serbian Chemical Society, 1999)
The sol-gel synthesis of silicon nitride powders has been studied. The precursor gels were prepared from a colloidal dispersion of silicon dioxide and sucrose, with mole ratios of reactants, C/SiO2, ranging from 2 to 4. ...
Vanadyl porphyrins in sedimentary kerogens/asphaltenes: Estimation of the concentration
(Journal of the Serbian Chemical Society, 1999)
A new, rapid method for determining the concentration of vanadyl porphyrins (VO2+-P) associated with the kerogen of bituminous sedimentary rocks, using electron spin resonance (ESR) is described. The method is simple, ...
Determination of cesium, rubidium and lithium by stabilized DC arc plasma emission spectrometry
(Journal of the Serbian Chemical Society, 1998)
Optimization of the conditions for the analytical application of a vertical argon stabilized DC are plasma, seeded by an easily ionizable element, potassium, is described. Such a plasma is used as an excitation source for ...
Ammonia adsorption on chemically modified activated carbon cloth
(Journal of the Serbian Chemical Society, 1998)
The effect of CuCl2, CuSO4, and H2SO4 impregnation of activated carbon cloth on ammonia adsorption at 303 K were examined. Cellulose based activated carbon cloth of various activities were used as the starting materials. ...
On the mechanism of strontium incorporation into calcium phosphates
(Journal of the Serbian Chemical Society, 1998)
The results of coprecipitation and sorption of strontium by amorphous and crystalline hydroxyapatite are presented. Coprecipitation experiments, performed over a wide range of experimental conditions, have confirmed that ...