Materials Literature
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The electroconvective instability (ECI) in nematic liquid crystals (NLCs), appearing beyond smectic C at cooling known as N with short range smecic C order, presents an unique electrooptical phenomenon due to generation and frustration of the smectic layering, which manifests inside the N temperature range. We found t…
High performance aqueous CdSe quantum dots (QDs) have been prepared by combination of Se source as vapor-phase and hydrothermal method. The main advantages of this approach included: one is to utilize H2Se vapor as a higher pure selenium source to make the prepared QDs have little other impurities, another is to obtai…
Ceramics of double perovskite RBaCo 2 O 5+ x (R = La, Nd, Gd, Y and Ho) were prepared in air at diferent annealing conditions. The samples were characterized by optical microscopy, X-ray powder difraction, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and micro-Raman spectroscopy. In the…
The vibrational modes of hydrogen bonds in CsH 5 (PO 4 ) 2 and NaH 5 P 2 O 6 compounds are analyzed via inelastic incoherent neutron scattering in a wide range of temperatures and Raman light scattering at room temperature. The energy ranges have been determined for the γ, jg, and ? bands of the vibrational modes of a…
We report the preparation of MOS2anode and solid electrolyte PVDF for the construction of three-dimensional (3D) Li-ion microbatteries based on silicon MCP. The MoS2layer anode electrode on the Ni layer exhibits a higher specific capacity compared to other anode materials. The outstanding electrochemical property of t…
Two topics are introduced from our studies on the formation mechanisms of nanochannels: thermal silicon oxidation to form silicon wire channels, and silicon-carbide thermal decomposition to form atomically thin graphene channels. Silicon emission and oxide viscous flow processes are necessary to explain thermal oxidat…
Subwavelength light focusing was demonstrated by plasmonic lenses consisting of nano-slits in an aluminium film. Lens performance agreed well with the FDTD modeling. The measured focal length and the design agreed to within 1.7%.
In the present work the effects produced by Eu 3+ incorporation into sol-gel silica (doping level range: 0.001-10 mol%) are monitored by means of Fourier transform vibrational spectroscopy in the wave number range 200-3000 cm −1 . Complementary microreflectance, TEM, and Raman spectroscopy measurements are also perfor…
A method for material fragmentation based on Lagrangian FEM with the concept of nodes separation is proposed. This method is consisted of nodes separation mechanism and elements distortion erosion. In the simulation the nodes of failure elements are separated to form crack and distorted elements are detected and elimi…
The elasticity moduli and absorption coefficients of longitudinal ultrasonic waves with a frequency of 2–50 MHz depending on the steel concentration and sintering temperature of 1400–1700°C in vacuum were studied in samples of cermet-type composites on the basis of corundum and stainless steel. The results were discus…
Monte Carlo simulations of multiple scattering contaminations in Compton scattering studies are reported. The samples used for this study are iron and tungsten with 662 KeV incident photons and 90° scattering angle.
The kinetics of indentation of a solid (viz., the dependence of the indenter intrusion depth on the time, force, and temperature), is analyzed theoretically taking into account quantum effects in the atomic dynamics of solids. The experimental study of the temperature dependence of the boron microhardness reveals qual…
The block copolymer self-assembly has the potential to form nanoscale periodic patterns on three-dimensional (3D) nanostructures and nanomaterials. However, block copolymer self-assembly processes have only been examined on two-dimensional flat plane substrates. Forming copolymer nanostructures onto 3D structures woul…
The presented article deals with a model of magnetic reversal in conducting lamination with a one central ferromagnetic layer and two outer non-ferromagnetic layers. Considering a single rigid 180 domain wall spreading through the axially magnetized ferromagnetic layer the calculation of induced eddy currents in lamin…
Mg72.5Zn26Y1.5 (at.%) quasicrystal alloys were investigated under different solidification conditions. The cooling curves were gathered by the multi-channel temperature acquiring system and the corresponding microstructures were analyzed. The morphology, microhardness and volume fraction of quasicrystals were detailed…
We present time-lapsed microscopy and EXAFS/XANES data on size selected ground ZnS:Cu,Cl and ZnS:Cu,Mn,Cl phosphors to probe long standing problems in using these phosphors in high brightness applications. The time-lapsed study shows that many of the individual emission centers on each particle degrade via large step…
A simple and reliable welding method was developed to weld carbon nanotubes with the power supply here. The carbon nanotubes were synthesized chemical vapor deposition method and Multi-walled carbon nanotubes was uesd here. Firstly, apply less than 5 V voltages between carbon nanotubes when they were in close proximit…
Three recently developed evaluation methods for the automated quantitative analysis of Xray scattering data (small-angle (SAXS) and wide-angle (WAXS)) are presented.They are applicable to extensive series of 2D patterns that are recorded in studies of polymer materials with uniaxial symmetry.The experiments comprise t…
The nanofiber plasmon effect on the two-photon polymerization (2PP) induced by a femtosecond laser is reported for the first time in this paper. The nanofibers were generated using a femtosecond laser, which was also used to construct microfeatures through two-photon polymerization of a nanofiber dispersed polymer res…
The progress in phase equilibria of polymer-solvent systems is briefly reviewed. The features of phase diagrams intended for production of fibers with high strength, deformation, and thermal properties are considered. Some attention is given to the fundamental role of S.P. Papkov in the creation and development of sci…