Materials Literature
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Multicolor fluorescent containers: A silica coating procedure has been devised for the preparation of multifluorescent dye-loaded zeolite L crystals with luminescent anisotropic cores and isotropic shells. The method comprises a combination of the polyelectrolyte layer-by-layer technique and Stöber synthesis (see sche…
The orthophosphate phosphors, Ba3La(PO4)3 activated with Dy3+ and Gd3+-Dy3+ ions, were prepared by a solid reaction technique at high temperature. Their spectroscopic properties were investigated in the vacuum ultraviolet (VUV)-visible range. We found that the introducing of Gd3+ greatly enhances the Dy3+ luminescence…
In the present paper, we report a simple approach for creating a nanocrystalline layer on the surface of stone wool fibers (SWFs) with a basalt‐like composition. The approach is based on a preoxidation process of the SWFs in atmospheric air at a temperature around the glass transition temperature ( T g ) for various d…
YNbO 4 and YNbO 4:RE (RE = Er 3+, Sm 3+, Tb 3+, and Tm 3+ ) nanophosphors have been prepared using a citrate-gel combustion procedure. The results of X-ray diffraction reveal that the YNbO 4 samples crystallized in both monoclinic and tetragonal phases in the investigated temperature range. The excitation spectra of t…
The purpose of this study was to compare the frictional properties of four self-ligating metal brackets, Speed, Damon 2, In-Ovation, and Time, with those of three conventionally ligated metal brackets, Time, Victory Twin, and Discovery. The self-ligating Time bracket can also be used as a conventionally ligated bracke…
Abstract Chitosan–poly(acrylic acid) polyelectrolyte complex nanoparticles were prepared by coacervation under mild experimental conditions without the use of any organic solvents or surfactants. The influence of some experimental parameters such as the pH of the polyelectrolyte solutions, their concentrations, and th…
Abstract A photosensitive epoxy resin was synthesized from bis(4‐hydroxy ‐3‐methoxy benzylidene) acetone and epichlorohydrin using solution polycondensation method. The prepared epoxy resin was characterized by UV, IR, 1 H NMR, and 13 C NMR spectroscopy. The thermal stability of the epoxy resin was assessed by thermog…
High quality films of polythiophene with different alkyl side chains were successfully synthesized by a novel method in the presence of sodium dodecylbenzenesulonate (SDBS) under N 2 atmosphere on the PTFE (polytetrafluorethylene) substrate. The as-prepared films were characterized by scanning electron microscopy (SEM…
Multiwalled carbon nanotubes (MWCNTs) are considered to be ideal multifunctional materials for biorelated applications, but there is still some controversy regarding their toxicity. In addition, the poor dispersibility of MWCNTs in either water or organic solvents has limited their practical applications. Therefore, o…
Trimethylsilylation of cellulose in different 1,3-dialkylimidazolium ionic liquids (IL) with hexamethyldisilazane (HMDS) as a silylating agent was investigated. Trimethylsilyl (TMSi) cellulose with a degree of substitution (DS) greater than 1 is insoluble in the IL. The maximum DS obtained depends on the nature of the…
The fracture toughness of four different silicon carbides was measured using single‐edge precracked beam (SEPB) and indentation/strength techniques. Two were development grades with similar microstructures and chemistries, and yet exhibited different fracture modes. The grade that exhibited a predominantly intergranul…
Abstract The local structure of Ba(Ti 0.70 ,Sn 0.30 )O 3 (BSnT) was investigated using micro Raman spectroscopy from 80 to 500 K, which indicated three local phase sequences. The dielectric spectroscopy studies illustrated freezing of polar nano‐regions (PNR) below 95 K, merger of frequency dispersion at 220 K, and th…
Temperature-dependent reflectivity spectra of a multiferroic hexagonal ${\text{YMnO}}_{3}$ single crystal were measured with polarized light in the ferroelectric phase. The phonon parameters for both $E\ensuremath{\parallel}c$ and $E\ensuremath{\perp}c$ polarizations are obtained by fitting the dielectric function to…
The geometrical, electronic and optical properties of alpha,alpha'-quater(3,4-ethylenedioxythiophene) (4EDOT) and alpha,alpha'-quater(thiophene) (4T) are studied by quantum-chemical calculations; the computed vibronic spectra at low and room temperature (RT) are compared to experiment. Our results suggest that the bet…
A study has been undertaken on the thermal stability and dispersion behavior of nanostructured Ce x Zr 1− x O 2 mixed oxides over anatase-TiO 2 support, synthesized by a deposition coprecipitation method and subjected to heat treatments at different temperatures. An unsupported Ce x Zr 1− x O 2 mixed oxide was also sy…
Glasses, supercooled liquids and proteins share common properties, in particular the existence of an energy landscape and the presence of two types of fluctuations, α and β. While the effect of α fluctuations on proteins has been known for a few years, the effect of β fluctuations has not been fully understood. By com…
Nanoscale surface patterning is of great importance for applications ranging from catalysts to biomaterials. We show the formation of ordered nanoscale dimple arrays on titanium, tungsten, and zirconium during electropolishing, demonstrating versatility of a process previously only reported for tantalum. This is a rar…
The article deals with the modelling of dynamic hysteresis loops. The modelling is carried out within the framework proposed by D. Jiles and D. Atherton. The dynamic effect of eddy currents is taken into account using G. Bertotti's approach. A satisfactory agreement between the measured and the modelled dynamic hyster…
The electronic structures of the compounds K[(5-Brsalen)(2)(H(2)O)(2)-Mn(2)M(III)(CN)(6)].2H(2)O (M(III) = Co(III), Cr(III), Fe(III)) have been determined by inelastic neutron scattering (INS) and magnetic susceptibility studies, revealing the manganese(III) single-ion anisotropy and exchange interactions that define…
A terahertz time-domain spectroscopic study was carried out as an effective measure to analyze the mechanism that induces superior properties in polyamide-6 nanocomposites. The peak frequency of dielectric loss appearing at about 3.0 THz shifts to a lower frequency by the presence of clay nanofillers, while it is inde…