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Polymer Blends Containing Liquid Crystalline Component Cholesteryl Palmitate-containing Blends

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光散射学报 2005年第3期17卷 231-233页

作者： maria-cristina popescu Cornelia Vasile Daniela Filip Doina Macocinschi Gh.Singurel Romanian Academy "Petru Poni"Institute of Macromolecular Chemistry41 A Grigore Ghica Voda AlleyIasiRomania "Al.I.Cuza"University Faculty of PhysicsOptics and Spectroscopy Department11 Blvd.Carol IIasiRomania

Physical blends containing macromolecular compounds and low molecular weight liquid crystals(LCs)have important *** are used as reinforcements for amorphous polymers or in display *** addition of LCs to amorphous polymers determines improvements in the mechanical properties of polymeric *** to their mechanical anisotropy,which results from molecular alignment,the LC molecules may orient themselves in the shear field of a processing *** cooling,this orientation may impart to the composites some improvements in the mechanical properties similar with that found with fibrous reinforcements,but with the advantage that the additive acts also as a *** glass transition temperature and the viscosity of the blend are lower than those of the starting polymer.

关键词： reinforcements Physical containing

Beneficial use of mussel shell as a bioadditive for TPU green composites by the valorization of an aqueous waste

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Waste Disposal and Sustainable Energy 2024年第1期6卷 123-137页

作者： SedefŞişmanoğlu Yasin Kanbur Carmen-Mihaela popescu Diana Kindzera Ümit Tayfun Department of Chemistry Karabuk University78050KarabukTurkey Petru Poni Institute of Macromolecular Chemistry of the Romanian Academy 700487IasiRomania Department of Chemical Engineering Lviv Polytechnic National UniversityLviv79013Ukraine Department of Basic Sciences Bartin University74110BartinTurkey

Scientific studies have focused on environmentally friendly solutions as effective as the reuse of crop products owing to plastic-waste problems in recent *** issue is the main driving force for upcoming academic research attempts in waste valorization-related ***,we integrated an aqua-waste,mussel shell(MS),as a bioadditive form into green thermoplastic polyurethane(TPU)green *** of the MS surface was performed to achieve strong adhesion between composite *** surface functionalities of MS powders were evaluated via infrared spectroscopy and scanning electron microscopy(SEM)*** samples were prepared by melt-compounding followed by injection molding *** was confirmed by morphological analysis that relatively better adhesion between the phases was achieved for composites involving surface-modified MS compared to unmodified *** strength and Young’s modulus of surface-modified MS-filled composites were found to be higher than those of unmodified MS,whereas the elongation at break shifted to lower values with MS *** shore hardness of TPU was remarkably improved after being incorporated with silane-treated MS(AS-MS).Stearic acid-treated MS(ST-MS)additions resulted in an enhancement in the thermal stability of the ***-mechanical analysis showed that the storage moduli of composites were higher than those of unfilled ***-MS additions led to an increase in the characteristic glass transition temperature of *** flow index(MFI)of neat TPU was highly improved after MS loading regardless of modification *** to the wear test,surface modification of MS displayed a positive effect on the wear resistance of *** the water absorption data of the composites were evaluated,the TPU/AS-MS composite yielded the lowest water *** silane layer on MS inclusion promoted water repellency of composites due to the hydrophobicity of *** results of the biodegradation

关键词： Aqua-waste Polyurethane Mussel shell Green composites Sustainability Waste valorization

Electrochemical Study and Electrodeposition of Copper（I） in Ionic Liquid-reline

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Chemical Research in Chinese Universities 2013年第5期29卷 991-997页

作者： popescu Ana-maria COJOCARU Anca DONATH cristina CONSTANTIN Virgil Laboratory of Molten Salts "Hie Murgulescu" Institute of Physical Chemistry of Romanian Academy Bucharest 060021 Romania Department of Applied Physical Chemistry and Electrochemistry University Politehnica of Bucharest Bucharest 010737 Romania

The authors made the electrochemical studies on the electrode processes during copper electrodeposition with ionic liquids-reline as an electrolytic medium. Reline is a commercial name for a eutectic mixture of choline chloride and urea（1：2, molar ratio）. This new proposed method of copper deposition is an ecological one because the ionic liquids are recyclable, non-volatile and non-toxic. Cyclic voltammetry investigations were conducted at 343 and 353 K in choline chloride-urea（Reline） deep eutectic solvent with single salt CuCl（generally in 0.05--0.38 mol/L concentration range）. Electrochemical impedance spectroscopy investigations were conducted in choline chloride- urea ionic liquid with CuCI（0.05 mol/L）. We investigated both cathodic and anodic processes of Cu＋ ions at different sweep rates in this new electrolytic system based on choline chloride. We have proposed by this an alternative to the classical copper electrodeposition. Coefficient of diffusion, Do, for the system Reline-CuCl is presented and the value of D0 is 1.22× 10^-8 cm2/s.

关键词： Ionic liquid Reline Electrodeposition Cu(I) Coefficient of diffusion

Oxygen-evolving SnO_(2)-based Ceramic Anodes in Aluminium Electrolysis

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Chemical Research in Chinese Universities 2014年第5期30卷 800-805页

作者： popescu Ana-maria Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy 060021-Bucharest Romania

This study deals with SnO2-based ceramic anodes doped with Sb203 and CuO, aiming at contributing new data regarding their electrochemical behavior in cryolite melts. The performances of the anodes were evaluated by anodic polarization, cyclic voltammetry, and current efficiency and corrosion measurements. The investigation proves that the anodic process of SnO2-based inert anodes occurs at a low overvoltage and the oxygen discharge takes place in one step with an exchange of two electrons. The current efficiency and corrosion were proved to be dependent on the electrolysis parameters and composition of electrolysis bath. For a long term electrolysis, the dissolution of the anode in the cryolite-alumina melt produced small aluminium contamination（ca. 0.2%, mass fraction）.

关键词： Inert anode Aluminium electrolysis Polarization Voltammetry

Determination of Metal Content in Soil and Wheat Plant by Inductively Coupled Plasma Mass Spectrometry

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Journal of Agricultural Chemistry and Environment 2024年第3期13卷 300-311页

作者： Iubu (Badea) Anişoara Ion V. popescu Claudia Stihi Ioana Daniela Dulama Doctoral School of Physics University of Bucharest Magurele Romania Faculty of Science and Arts Valahia University of Targoviste Targoviste Romania Academy of Romanian Scientists Bucharest Romania Institute of Multidisciplinary Research for Science and Technology Valahia University of Targoviste Targoviste Romania

This study aims to investigate the level of soil pollution and the grade of accumulation of metals and heavy metals by wheat plants from the soil in different parts of the crop: root, stem, leaf, spike and grain. Sampling campaigns took place in February, April and July when wheat plants were at different growth stages. A number of eight soil samples and eight wheat plant samples were collected. The sampled wheat plant was taken at the same time and from the same place as the soil. Concentrations of Al (aluminium), Cr (chromium), Mn (manganese), Fe (iron), Ni (nickel), Co (cobalt), Cu (copper), Zn (zinc), Sr (strontium), Cd (cadmium) and Pb (lead) were determined by inductively coupled plasma mass spectrometry. Bioconcentration and translocation factors were calculated for the samples analysed.

关键词： Soil Wheat Plant Heavy Metals Translocation Factor

Recovery of Metals from Anodic Dissolution Slime of Waste from Electric and Electronic Equipment（WEEE） by Extraction in Ionic Liquids

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Chemical Research in Chinese Universities 2018年第1期34卷 113-118页

作者： Ana maria popescu Kazimir YANUSHKEVICH Vasile SOARE cristina DONATH Elena Ionela NEACSU Virgil CONSTANTIN "Ilie Murgulescu" Institute of Physical Chemistry of Romanian Academy Laboratory of Electrochemistry and Corrosion Splaiul lndependentei 202 Bucharest 060021 Romania Scientific-Practical Materials Research Centre National Academy of Belarus P. Brovki 19 str. 220072 Minsk Belarus National R&D Institute for Nonferrous and Rare Metals-IMNR 102 Biruintei Blvd. Pantelimon Ilfov County Romania

The recovery of metals from a multi-component alloy obtained by crushing, melting and anodic dissolution of waste from electric and electronic equipment（WEEE） was investigated. The anodic dissolution of the alloy was carried out in an electrolysis cell with one copper cathode and a central cast anode, immersed in the electrolyte formed by choline chloride-ethylene glycol-iodine. The temperature of the electrolyte during the process was 343 K. Depending on the electrolysis parameters（current density and cell voltage）, cathodic deposits of Sn, Pb and Zn of 〉99% purity were obtained. Cyclic voltammetry was used in order to determine the deposition potentials of the studied metals. The obtained metallic deposits were subject of determination of XRD, SEM/EDX and AFM in order to evidence the deposits structure and morphology. The experiments performed demonstrated the possibility of separating/selective recovery of metals from the multi-component alloy resulted from the waste from electrical and electronic equipment by anodic dissolution in ionic liquids.

关键词： Metals recovery Ionic liquid Waste from electric and electronic equipment(WEEE)

Structure and heat capacity of the NaCeF_4 compound

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Journal of Rare Earths 2013年第9期31卷 911-915页

作者： Virgil Constantin Ana-maria popescu "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy Splaiul Independentei 202 st.060021BucharestRomania

This work continued our general research program on obtaining metallic cerium by electrodeposition from NaCeF4 dis-solved in different molten fluorides. The structure of NaCeF4 （cubic or hexagonal depending on the way of preparation） was estab-lished by DTA analysis, IR spectra and X-ray diffraction. The heat capacity （Cp） of NaCeF4 was measured by differential scanning calorimetry in the temperature range of 300-1093 K using the“step-method”. The Cp was fitted by an equation with a satisfactory re-sult. Heat capacity was compared with that calculated from the Neumann-Kopp rule （NKR） and the deviations observed were consis-tent with the stability of the NaCeF4 compound.

关键词： cerium compounds structure heat capacity NaCeF4 rare earths

Current Efficiency, Corrosion and Structural Changes in SnO2-Sb2O3-CuO Inert Anodes for Aluminium Electrolysis

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Chinese Journal of Chemical Physics 2014年第3期27卷 368-372页

作者： Ana-maria popescu Virgil Constantin Ilie Mur&ulescu Institute of Physical Chemistry of the Romanian Academy Splaiul Independentei 202060021 Bucharest Romania

A systematic study was conducted on current efficiency （CE）, corrosion and structural changes in SnO2-based inert anodes （made of 96wt%SnO2＋2wt%Sb2O3＋2wt%CuO） on a laboratory Hall-Heroult aluminium cell. The influence of operating parameters and electrolyte composition on the CE and corrosion process were evaluated. The CE was found to be more than 90% and catastrophic corrosion took place at low percent of Al2O3, high percent of LiF, low cryolite ratio and high current densities. From all the structural changes that took place in the SnO2-based inert anodes, we assumed that the most important contribution was due to the migration of CuO towards the outer limits of the constituent grains of SnO2 based ceramic. The complex process occurred during the formation of various phases and their sintering ability both directly depended on Cu/Sb molar ratio.

关键词： Inert anode Aluminium electrowinning Current efficiency

Synthesis, Characterization and Thermophysical Properties of Three Neoteric Solvents-Ionic Liquids Based on Choline Chloride

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Chemical Research in Chinese Universities 2014年第1期30卷 119-124页

作者： popescu Ana-maria CONSTANTIN Virgil Laboratory of Molten Salts llie Murgulescu Institute of Physical Chemistry of the Romanian Academy Bucharest 006021 Romania

The authors prepared,characterized and preliminary studied the properties of some neoteric solvents-ionic liquids based on choline chloride,i.e.,three ionic liquids based on the eutectics of choline chloride（2-hydroxyN,N,N-trimethylethanaminium chloride） with,respectively,urea,malonic acid and citric *** obtained mixtures were clear and colorless ionic liquids at room *** thermophysical properties,namely,density,viscosity,and electrical conductivity of these mixtures were investigated as a function of temperature within a range of 298-353 *** for the temperature dependence of the measured properties were generated and discussed in terms of Arrhenius *** the electrochemical windows of the eutectic liquids were determined.

关键词： Neoteric solvent Ionic liquid Choline chloride Malonic acid Citric acid Density Viscosity Conductivity