National Research Development Institute For Nonferrous and Rare Metals IMNR

Pantelimon, Romania

National Research Development Institute For Nonferrous and Rare Metals IMNR

Pantelimon, Romania
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Radu A.-L.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Sarbu A.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Motoc S.,Metallurgical Research Institute | Mara L.,National Research Development Institute for Nonferrous and Rare Metals IMNR | And 6 more authors.
Materiale Plastice | Year: 2010

Mesoporous silica was obtained by the acid attack of a serpentinite rock. This material was soaked with acrylonitrile (containing azobisisobutyronitrile as initiator) and the radical polymerization led to the obtaining of polymer inorganic-organic nanocomposites. The polymer nanocomposites were transformed in carbonsilica nanocomposites by the cyclization and graphitization of the carbon chain polymer. Heating the carbonsilica nanocomposite in nitrogen atmosphere allowed the synthesis of silicon nitride, a raw material for special ceramics.


Gheorghita M.,National Research Development Institute For Nonferrous and Rare Metals IMNR | Sirbu E.,National Research Development Institute For Nonferrous and Rare Metals IMNR | Purcaru V.,National Research Development Institute For Nonferrous and Rare Metals IMNR | Mirica N.,National Research Development Institute For Electrochemistry and Condensed Materials INCEMC | And 2 more authors.
Revista de Chimie | Year: 2011

Using cyclic voltammetry method (CV), the electrochemical behaviour of Ga and Al like compounds, present in synthetic alkaline solutions with concentrations similar to sodium aluminates solutions resulted from Bayer process of bauxite processing, it was reported. This paper describes the electrochemical behaviour of Ga in NaOH, under the form of sodium galate, NaGaO 2 the electrochemical behaviour of Al like aluminium hydroxide, and also the electrochemical behaviour of Ga and Al in known concentrations of NaOH solutions. These investigations achieved by cyclic voltammetry were aimed to monitor the cementation process of gallium on gallium-aluminium alloy, by identifying the electrode potentials at which should be monitored the cementation process for a maximum yield in gallium recovery by proposed method.

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