science
SERIA B
Chimie și Știința Materialelor
Excelență în Cercetare
Din 1929
Arhiva Online
Ani
Assessment of matrix materials and techniques available for conditioning aluminum radioactive waste
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Nicoleta Deneanu, Mirela Dulama, Ion Teoreanu
At national level, there are aluminum radioactive wastes produced in the decommissioning of the nuclear facilities. A method for the conditioning of aluminum radioactive wastes consists in making metallic aluminum to react with an alkali solution in order to generate hydrogen gas, and mixing the...
Proton exchange membranes from polyelectrolytes based on cellulose-containing composites
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Nicoleta Doriana Stanciu, Ana-Maria Albu, Dumitru Mircea Vuluga, Mircea Teodorescu
Our study reveals the possibility of preparing low cost polyelectrolyte membrane films from cellulose composites and polymers or copolymers of methacrylic acid. The complex precipitation simultaneously with the in situ polymerization leads to a thin continuous film with the matrix of the same...
ZnO:Mn submicron wires prepared by electrochemical synthesis
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Mariana Sima, Teodor Viºan, Marian Sima, Eugeniu Vasile
Electrodeposition of manganese doped ZnO submicron wires into polycarbonate membrane pores from aqueous solutions containing Zn(NO3)2+Mn(NO3)2 was investigated using linear sweep voltammetry and electrochemical impedance spectroscopy (EIS). The precipitation of ZnO:Mn semiconductor in the pores...
Thermodynamic properties of some chloro-fluoro-hydrocarbons from cubic equations of state
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Viorel Feroiu, Dan Geanã, Catinca Secuianu
Thermodynamic properties, including pressure – volume – temperature (PVT), were predicted along the saturation curve for refrigerants R22 (Chlorodifluoromethane), R124 (2-chloro-1,1,1,2-tetrafloroethane) and R142b (1-chloro-1,1-difluoroethane). Three cubic equations of state (EOS)...
Methodology of in vitro characterization of human uroliths
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Anton Ficai, Ecaterina Andronescu, Georgeta Voicu, ªtefan Pall
The purpose of this study is the compositional and morphological characterization of human uroliths. The uroliths were characterized from the compositional point of view by XRD, FTIR while the morphological characterization was made by SEM. It is important to mention that the uroliths extracted...
Improvements in the confirmation of stanozolol abuse in doping control
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Valentin Pop, Ileana Vâjialã, Mirela Zorio, Gabriel-Lucian Radu
The usual method used by doping control laboratories to prove stanozolol abuse in sport has been based for many years on the detection of its urinary metabolites 3’-hydroxy- and 4β-hydroxy-stanozolol by gas chromatography coupled to low or high resolution mass spectrometry. This...
Electrochemical evaluation of polyphenols preservative effect against lipoperoxidation
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Simona-Carmen Litescu, Andreia Tache, Sandra Ana-Maria V. Eremia, Camelia Albu, Gabriel-Lucian Radu
This paper presents a new developed electro-analytical tool – gold modified electrode with low-density lipoprotein – able to mimic the biological response of cellular wall against the oxidative damage induced by free radicals attack. Results obtained when applying this tool in the...
Reflectance spectroscopy as a useful tool for monitoring apricot fruit quality and ripening
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Cristina Petriºor, Gabriel-Lucian Radu, Viorica Bãlan, Gheorghe Câmpeanu
Fruit visual appearance is one of the first quality determinants, and encouraging consumers to buy them. Often the fruit appearance, especially color, is the most critical factor in the initial sale. In the past, the evaluation of apricot color has been subjective and based on visual ratings....
Structural investigations of scandia - doped zirconia nanopowders obtained by sol-gel method
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Bogdan ªtefan Vasile, Ecaterina Andronescu, Daniel Florea, Cristina Ghiþulicã
The aim of this work is the preparation and characterization of cubic zirconia nanopowders stabilised with 10 mol % scandia. The sol-gel method was employed for the preparation of the nanopowders, using zirconium propoxide and scandium chloride/oxide as precursors.\r\nThe nanopowders were...
Treatment of Acid Blue 25 containing wastewaters by electrocoagulation
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Alexandra-Raluca Miron, Cristina Modrogan, Oanamari Daniela Orbuleþ, Cristina Costache, Iustina Popescu
In this study, the electrocoagulation of the Acid Blue 25 dye in aqueous solution using aluminium as sacrificial anode was investigated. Experiments were carried out with 5۰10-5M initial concentration. The performance of the electrocoagulation process was analyzed in terms of...
Model studies of NOx and SOx reactions in flue gas treatment by electron beam
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Anca Mihaela Bulearcã, Ioan Cãlinescu, Vasile Lavric
The main objective of this paper is to realize a model for the SO2 and NOx removal process from flue gases by electron beam irradiation. Different compositions were studied: from NO in N2 to NO in a complex mixture of NO and SO2 from a gas that contains N2, O2, water, CO2 and NH3, having similar...
Palladium nanoparticles synthesis with controlled morphology by polyol method
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Daniela Berger, Gina Alina Trãistaru, Bogdan ªtefan Vasile, Ioana Jitaru, Cristian Matei
The paper deals with the synthesis of Pd nanoparticles with controlled morphology by polyol method at 140 °C, using different palladium precursors (PdCl2 and K2PdCl4) and stabilizers (polyvinylpyrrolidone, PVP, and cetyl trimethyl ammonium bromide, CTAB). Pd nanoparticles synthesized from PdCl2...
Leaching behavior of cement-based solidified wastes containing hexavalent chromium
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Constantin Bobiricã, Liliana Bobiricã, Rodica Stãnescu, Ionel Constantinescu
Characterization of the leaching behavior of doped cement specimens with hexavalent chromium in distilled water used as leachant was investigated. Dynamic leaching tests on monolithic specimens were carried out to determine the fraction of contaminant release as a function of leaching period and...
Synthesis, characterization and antibacterial activity of new Ni(ii), Co(ii) and Cu(ii) complexes with N,N’-diacylhydrazines
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Mãdãlina Veronica Angeluºiu, Tudor Roºu, Maria Negoiu, ªtefania-Felicia Bãrbuceanu, Gabriela Laura Almãjan
The present paper describes the new ligand, N’-[4-(4-chloro-phenyl-sulfonyl) benzoyl]-2-oxoimidazolidine-1-carbohydrazide (L) which has been prepared by the reaction of 4-(4-chlorophenylsulfonyl)benzoic acid hydrazide and 2-oxoimidazolidine-1-carbonyl chloride. Also, the complexes...
Lead pre-concentration using solid phase extraction
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Alina Culeþu, Alina Catrinel Ion, Ion Ion, Constantin Luca
Lead is recognized worldwide as a poisonous metal, due to its negative effects. Thus, the determination of this element is often required in environmental and food samples. However, these analyses are difficult because such samples contain lead at trace level, which may be lower than the...
Modelling mesoscale diffusion processes in a bioartificial membrane
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Mariana Ioniþã, Nicoleta Donisan, Ioan Viorel Brânzoi
This study describes our current efforts to establish a protocol based on bead-spring approach encoded in Dissipative Particle Dynamics (DPD) to investigate Gentamicin diffusion through Chitosan-PVA membranes. Chitosan-PVA-Gentamicin mesoscale computational bulk models of 10*10*10 reduced units...
Obtaining nanoparticles by electrolytic method
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Vasile-Sorin Mãnoiu, Angel Aloman
This paper contains experimental results on obtaining silver nanoparticles by an electrolytic method using two electrodes of pure silver. Two different sets of experiments were conducted: one using high tensions (kilovolts) and another one using low tensions (volts,) with different electrolysis...
Thermodynamic study of binary Pb-Sb system using the POSS model
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Florentina Pereþeanu, Dragoº Taloi, Ion Constantin
The partial ordonated subsubregular solutions model (POSS) has been applied to interpret the experimental thermodynamic data in the Pb-Sb system at 923K. A very good agreement has been obtained between experimental and calculated activity values for both components Pb and Sb in the whole...
Melt spun Fe-Co-Cr-B-Si alloys electrical, magnetic and thermal properties characterization
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Iulia Solomon, Nicolae Solomon
The amorphous alloys are materials with superior magnetic and electrical properties. These properties are influenced by the chemical composition, the heat treatment state, the surface condition, the production technology, etc \r\nThe goal of this paper is to present the research results of the...
Structural characterization of TiN/HAp and ZrO2/HAp thin films deposited onto Ti-6Al-4V alloy by magnetron sputtering
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Alina Molagic
Radio frequency (RF) magnetron sputtering is a promising deposition technique that can produce dense and well-adhered films. This technique was applied to deposit thin TiN/HAp and ZrO2/HAp films on titanium implants. The TiN interlayer plays an important role in improving adhesion of HAp to...
Experimental characterization of two stainless steel explanted Ender pins
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Octavian Trante
This paper presents the comparison of two explanted Ender pins. The pins were studied regarding their chemical composition, their structure, mechanical properties and corrosion resistance. The tests and the evaluation of results were according to ASTM and ISO standards. An important aspect is...
Synthesis and microstructural observations during ball milling in Fe88Zr7B4Cu1 nanostructured alloys
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Vasile Dãnuþ Cojocaru, Radu Nicula, Manuela Stir, Eberhard Burkel
The aim of the present work is to study the ball milling synthesis and microstructural changes in particles morphology during ball-milling. NANOPERM alloy powders were prepared by high-energy ball-milling. The as-milled alloys consist of an iron-based nanocrystalline solid solution. The...