National Institute Of Materials Physics - Romania

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5714 articles found

2121. Sm:HAp Nanopowders Present Antibacterial Activity against Enterococcus faecalis

Authors: Ciobanu, CS; Popa, CL; Predoi, D

Published: 2014, JOURNAL OF NANOMATERIALS, 2014, DOI: 10.1155/2014/780686

The synthesis of nanoparticles with inhibitory and bactericidal effects represents a great interest in development of new materials for biological applications. In this paper we present for the first time the synthesis of Ca10-xSmx(PO4)(6)(OH)(2) nanoparticles at low temperature and primary tests concerning the adherence of Enterococcus faecalis ATCC 29212 (gram-positive bacteria). All the XRD peaks were indexed in accordance with the hexagonal HAp in P63m space group. The EDAX spectrum and elemental mapping of O, P, Ca, and Sm demonstrate that all the elements were homogeneously distributed in Ca Sm-10-x(x).(PO4)(6)(OH)(2) with x(Sm) = 0.03. The peaks at 347.3 eV, 532.1 eV, and 133.8 eV in the XPS spectra can be attributed to the binding energy of Ca 2p, O is, and P 2p. The peak at 1084.4 eV observed in Ca Sm-10-x(x)(PO4)(6)(OH)(2) was attributed to the Sm 3d(5/2). Bacterial adhesion was reduced on Ca Sm-10-x(x)(PO4)(6)(OH)(2) sample when compared to pure HAp (x(Sm) = 0) and significant differences in bacterial adhesion on pure HAp (x = 0) and Sm:HAp (x(Sm) = 0.01,x(Sm) = 0.03, and x(Sm) = 0.1) were observed. The bacterial adhesion decreased when the samarium concentrations increased. Finally, we demonstrate that the Sm: HAp nanopowder with x(Sm) > 0 showed high antibacterial activity against Enterococcus faecalis ATCC 29212.

2122. Correlation between Microstructure and Magnetic Properties on MnZn Ferrite with Bi2O3 Increasing Addition

Authors: Branzei, M; Cristea, I; Ciuca, I; Bibis, A; Feder, M

Published: 2014, ADVANCED MATERIALS AND STRUCTURES V, 216, 28, DOI: 10.4028/www.scientific.net/SSP.216.23

The aim of this paper is quantitative characterization of a MnZn ferrite with Bi2O3 increasing addition using the Image-Pro Plus software from Media Cybernetics. The sample matrix is a ferrite with the following chemical composition: Mn0.54Zn0.37Fe2.06O4. We applied the conventional ceramic technology in order to obtain the samples. Thus, the raw materials, i.e. alpha Fe2O3, Mn3O4, and ZnO, in a molar ratio 53:28:19 were mixed in suitable proportions in a steel ball-mill using demineralized water. The mixture was burn off at 800 degrees C for 1 hour, in air. The pre-sintered powder was milled in steel ball-mill with increasing addition of Bi2O3 (0.00, 0.01, 0.03, 0.05, 0.07, 0.10, 0.30, 0.50 wt %). For quick references, the sample without bismuth ions was denoted and the samples with increasing concentrations were numbered from "1", "7".

2123. Synthesis and exceptional thermal stability of Mg-based bimetallic nanoparticles during hydrogenation

Authors: Krishnan, G; Negrea, RF; Ghica, C; ten Brink, GH; Kooi, BJ; Palasantzas, G

Published: 2014, NANOSCALE, 6, 11970, DOI: 10.1039/c4nr03885a

Here we report the extraordinary thermal stability of Mg rich bimetallic nanoparticles (NPs), which is important for hydrogen storage technology. The enhanced NP stability is accomplished because of two critical improvements: (i) no void development within NPs (nanoscale Kirkendall effect) during their formation and (ii) suppressed Mg evaporation and NP hollowing during Mg hydrogenation at elevated temperature. The mechanism leading to the improved thermal stability of Mg-based bimetallic NPs is shown to be due to MgH2 hydride formation before evaporation can take place. These findings were tested for various compositions of Mg with Ni, Cu, and Ti, which are interesting combinations of materials for hydrogen storage systems. To achieve this we first demonstrate the synthesis mechanism of Mg-Ni and Mg-Cu NPs, which is well controlled at the single particle level, in order to accomplish multi-shell, alloy and intermetallic structures of interest for hydrogen storage tests. Aberration corrected transmission electron microscopy was carried out to unravel the detailed atomic structure and composition of the bimetallic NPs after production, processing, and hydrogenation. Finally, a simple and effective methodology is proposed for tuning the composition of the Mg-based bimetallic NPs based on the temperature-dependent nucleation behavior of NPs in the gas-phase.

2124. Structural Characterization of Impurified Zinc Oxide Thin Films

Authors: Trinca, LM; Galca, AC; Stancu, V; Chirila, C; Pintilie, L

Published: 2014, ELECTROCERAMICS XIV CONFERENCE, 1627, 128, DOI: 10.1063/1.4901669

Europium doped zinc oxide (Eu:ZnO) thin films have been obtained by pulsed laser deposition (PLD). 002 textured thin films were achieved on glass and silicon substrates, while hetero-epilayers and homo-epilayers have been attained on single crystal SrTiO3 and ZnO, respectively. X-ray Diffraction (XRD) was employed to characterize the Eu:ZnO thin films. Extended XRD studies confirmed the different thin film structural properties as function of chosen substrates.

2125. SYNTHESIS AND CHARACTERIZATION OF GLASS-CERAMIC SUPERCONDUCTORS IN (Pb, B)-DOPED Bi-Sr-Ca-Cu-O SYSTEM

Authors: Fruth, V; Tanase, G; Atkinson, I; Pandele Cusu, J; Aldica, G; Zaharescu, M

Published: JUN-JUL 2014, REVUE ROUMAINE DE CHIMIE, 59, 383, DOI:

Glass-ceramic superconductors in the Bi-Sr-Ca-Cu-O system were prepared by melt-quenching method in the presence of some additives (Pb, B). The studied glasses were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (DTA/TGA) and differential scanning calorimetry (DSC). On the crystallized ceramics obtained by the annealing the glasses, transport resistance and XRD measurements were also done. The glass transition temperatures (T-g) was found to range in the 380-430 degrees C domain, followed by a set of exothermal effects that could be assigned to the crystallization of the superconducting phases. The nucleation and growth of the crystals is influenced by both the nature of the oxides used as additives and by their ratio. So, the samples doped with low amount of B (x=0.1 and 0.2) present obvious transitions at about 110 K, highlighting the presence of the 2223 phase in highest amount and well interconnected.

2126. Stress Influenced Trapping Processes in Si Based Multi-Quantum Well Structures and Heavy Ions Implanted Si

Authors: Ciurea, ML; Lazanu, S

Published: 2014, INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2014 (ICCMSE 2014), 1618, 63, DOI: 10.1063/1.4897674

Multi-quantum well structures and Si wafers implanted with heavy iodine and bismuth ions are studied in order to evaluate the influence of stress on the parameters of trapping centers. The experimental method of thermostimullatedcurrents without applied bias is used, and the trapping centers are filled by illumination. By modeling the discharge curves, we found in multilayered structures the parameters of both 'normal' traps and 'stress-induced' ones, the last having a Gaussian-shaped temperature dependence of the cross section. The stress field due to the presence of stopped heavy ions implanted into Si was modeled by a permanent electric field. The increase of the strain from the neighborhood of I ions to the neighborhood of Bi ions produces the broadening of some energy levels and also a temperature dependence of the cross sections for all levels.

2127. Zinc Oxide and Polysaccharides: Promising Candidates for Functional Nanomaterials

Authors: Preda, N; Enculescu, M; Zgura, I; Socol, M; Florica, C; Evanghelidis, A; Matei, E; Enculescu, I

Published: 2014, SIZE EFFECTS IN NANOSTRUCTURES: BASICS AND APPLICATIONS, 205, 136, DOI: 10.1007/978-3-662-44479-5_5

Recently, ZnO and natural polysaccharides have received more and more attention as interesting components for designing complex functional nanomaterials, key elements being their high occurrence and low-cost. In this chapter are presented possibilities for tailoring the ZnO properties by using polysaccharides in the synthesis process as well as reports on the functionalization of cellulose-based natural fabrics with ZnO. In both cases, in the preparation step were used only simple and scalable wet chemical methods. The resulting materials with suitable characteristics, e.g. dependence of the ZnO nanostructures optical properties on their morphology or high-UV blocking and superhydrophobicity for ZnO-functionalized fabrics, can find applications in domains where such qualities are required.

2128. Boundary conditions effect on states and transitions in a quantum-well - nanobridge - quantum dot structure

Authors: Goray, LI; Racec, PN

Published: 2014, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON 2014 DAYS ON DIFFRACTION (DD), 95, DOI:

We consider a varied-dimension InGaAs/GaAs structure of quantum well - nanobridge (NB) - quantum dot embedded in a "virtual" cylinder Omega. Electron and hole eigenstates are computed for the whole system using the finite volume method and effective mass approximation. Hybrid states and significant oscillator strength changes appear in the combined system at small values of the NB length under the Dirichlet boundary conditions imposed on the boundaries of Omega.

2129. High-Order Modes in High Permittivity Cylindrical Dielectric Resonator Antenna Excited by a Wide Microstrip Line

Authors: Avadanei, OG; Banciu, MG; Nedelcu, L

Published: 2014, 2014 10TH INTERNATIONAL CONFERENCE ON COMMUNICATIONS (COMM), DOI:

The aim of the paper is to identify the modes that can be excited by a wide microstrip line, in a cylindrical DRA situated symmetrically above it, to study the radiating performances of these modes and to present their radiating patterns. We managed to identify thirteen high-order modes; among these modes, four of them: HEM112, TMme(311), TEme(112), and TEme(121) have high transmission performances.

2130. DRUG DELIVERY STUDY OF SINGLE-WALL CARBON NANOTUBES COVALENT FUNCTIONALIZED WITH CISPLATIN

Authors: Ciobotaru, CC; Damian, CM; Polosan, S; Prodana, M; Iovu, H

Published: APR-JUN 2014, DIGEST JOURNAL OF NANOMATERIALS AND BIOSTRUCTURES, 9, 868, DOI:

Carbon nanotubes are widely studied components for drug delivery systems due to their high surface area and low chemical reactivity. The research presented in this paper deals with the synthesis of drug delivery systems based on single walled carbon nanotubes (SWCNTs) and the well-known cancer treatment drug Cisplatin. The new nanomaterials obtained through covalent bonding between carboxyl groups from the SWCNTs surface and amino groups from the Cisplatin structure were characterized from structural point of view. To evaluate the content of drug released the Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was employed. The releasing profile shows a slow rate in the beginning followed by a spectacular increase after 180 minutes which means that this type of system could be used for prolonged release.