Published in Materials Science-Poland
Using the molecular dynamics (MD) technique, we have investigated a nano droplet composed of twenty mesogene molecules 4-n-alkyl-4-cyanobiphenyl (9CB). The geometry of the 9CB molecule was calculated with the DFT method. We treat 9CB molecules as rigid bodies, the intermolecular interaction is taken to be the full site-site pairwise additive Lennar...
Published in Materials Science-Poland
Pure bone material obtained from cow meat, as apatite-rich material, and TiO2-bone composite materials are prepared and studied to be used for heavy metal ions separation from waste water solutions. Meat wastes are chemically and thermally treated to control their microstructure in order to prepare the composite materials that fulfill all the requi...
Published in Materials Science-Poland
The effect of processing conditions on the phase, microstructure and dielectric properties of SrCa4Nb4TiO17 and Ca5Nb4TiO17 microwave ceramics was investigated. The ceramics processed via solid state mixed-oxide route were characterized using XRD, Raman spectroscopy and SEM for phase, molecular vibrational modes and microstructural analysis respect...
Published in Materials Science-Poland
The study of carrier transport in granular nanocomposite films consisting of ferromagnetic Fe45Co45Zr10 alloy nanoparticles embedded in a low-conductive Pb81Sr4(Na5Bi5)15(Zr57.5Ti42.5)O3 matrix has been performed. Real part of the impedance of the nanocomposites was studied as a function of composition, temperature and frequency, for the samples wi...
Published in Materials Science-Poland
Four different hybrid organic-inorganic materials based on TiO2-SiO2 matrices with organic additives and doped with rare-earth metal ions (III) from the group of europium, cerium, terbium, neodymium, dysprosium and samarium, were synthesized by sol-gel method. Tetraethyl orthosilicate, titanium (IV) isopropoxide and organic compounds, such as butyl...
Published in Materials Science-Poland
A facile process was developed for synthesizing vanadium dioxide (VO2) by pyrolyzing ammonium metavanadate (NH4VO3) in nitrogen flow. The process was designed on the base of thermodynamic modeling of chemical reaction and thermal analyzing of NH4VO3 pyrogenation in N2 gas, and optimized by experiments. X-ray diffraction (XRD), scanning electron mic...
Published in Materials Science-Poland
NH4H2PO4 nano-composite antiferroelectric materials in porous glass have been studied by means of dielectric and dilatometric investigations. Dielectric spectroscopy measurements in a wide frequency range are reported here for the first time, for both the antiferro- and paraelectric phases of ammonium dihydrogen phosphate (ADP) embedded in a porous...
Published in Materials Science-Poland
Carbon monoliths prepared from hard coal precursors were obtained. The porous structure of the monoliths was evaluated on the basis of nitrogen adsorption — desorption equilibrium data. The investigated monoliths have a well-developed microporous structure with significant specific surface area (SBET). Equilibrium studies of methanol vapour adsorpt...
Published in Materials Science-Poland
The structure and diffusion in SiO2 and Al2O3 liquids under pressure have been studied by molecular dynamics simulation. We show that although different states of considered liquids differ significantly in the number of TOx units and OTy linkages (T = Si, Al; x = 4, 5, 6; y = 2, 3, 4), their partial bond angle distributions (BAD) are identical. Fur...
Published in Materials Science-Poland
The crystallization morphologies, thermal behaviors and mechanical properties of PP/PTT/nanoclay blends nanocomposite fibers were investigated. Polypropylene/poly (trimethylene terephthalate) blends containing montmorillonite (MMT) were prepared using a twin screw extruder followed by fiber spinning process. The melt intercalation of PP and PPT all...
