Zamora Iordache P.,Scientifical Research Center for Defence and Ecology |
Lungu R.M.,Scientifical Research Center for Defence and Ecology |
Epure G.,Scientifical Research Center for Defence and Ecology |
Muresan M.,Scientifical Research Center for Defence and Ecology |
And 6 more authors.
Journal of Optoelectronics and Advanced Materials | Year: 2011
The obtaining of intelligent materials requires strict control of physical and chemical parameters that characterize them. In most cases, especially in the case of the nano- or microcomposite structures, the parameters to be controlled and quantified are of morphological and topological nature. This is a direct consequence of the fact that the chemical and physical properties of the nanoparticles and composite materials are strongly dependent on the geometric dimensions. In order to obtain certain material structures a strict control and conditioning of the nanostructured morphology and topology elements entering the composition of the material base is required. By controlling these parameters one may change the surface physical and chemical properties of the component structural elements (electrical and magnetical polarizability, interface free energy, etc.) so as to set a series of phase equilibria that should favour the obtaining of the desired structural properties. This paper proposes an analytical model for solving the morphology and topology which characterises the functionalized nanostructures. This model allows the establishment of analytical connections between real morphological and topological parameters, and the optoelectronically acquired data. Also, the analytic model allows the finding of its own values which characterize the morphological and topological structure of the nanostructure elements.
Cirjaliu-Murgea M.,Polytechnic University of Bucharest |
Ionita A.D.,Polytechnic University of Bucharest |
Iordache P.,Scientifical Research Center for Defence and Ecology |
Filipescu L.,Polytechnic University of Bucharest
Revista de Chimie | Year: 2011
A new approach of the foliar nutritive fluids formulation as emulsions and their properties design was grounded on the last illuminations in the mechanism and kinetics of the foliar nutrition. Emulsified organic and inorganic phases are bearing extended multifunctional biological activities - nutrition, growth enhancing and fungi repelling. Selection of the overbasic potassium salts of naphthenlc and oleic acids as organic phase carrier entrusted leverage control of the foliar required properties through their overbasicity, hydrolysis and hydrolysis pH, as well as through the mixed organic!inorganic hydrolysates particle size distribution inside the film formed at the foliage surface. Aqueous phase may accommodate variable formula of NPK macronutrients and regular contents of micronutrients under suited restrictions called by the emulsion stability. Due to the both phases reactivity, at the foliage level the diluted fluid leaves a matrix made up by organic hydrolysates, grafting the entire mineral charge as an amorphous phase ready to dissolve at high rate. All new bom biological active entities are released by organic matrix as nanoparticulate amorphous matter, as well as nacelles charged with amorphous nanoparticulate at a rate close to plant demands, preventing overdosing and eventual plant harms. All nutritive fluid components are biodegradable or non harmful for environment The sorption mechanism-property correlations are illustrated by property-composition diagrams, pH monitoring during organic matrix precipitation and reaction with air carbon dioxide, dynamic particle size distribution in hydrolyzing emulsions, and film morphology in correlation with nutrients concentration distribution in layered film.