Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We report that SWCNTs substantially improve the uniformity and coverage of TiO2 coatings on porous ZrO2 ceramic membrane filters. The ZrO2 filters were dip coated with 100 nm anatase TiO2, TiO2/SWCNT composites, a TiO2+SWCNT mixture, and a TiO2/MWCNT composite at pH 3, 5, and 8. Whereas the TiO2+SWCNT mixture and the…
The spinodal phase decomposition of an immiscible binary polymer blend system is investigated with numerical models in two-dimensional and three-dimensional (3D). The effect of the elastic energy is included. The mechanism of the evolution of the phase separation is studied and the characteristic length R(t) is shown…
The structural properties of ${\text{Ni}}_{2}\text{FeGa}$ Heusler alloy synthesized by melt-spinning technique have been systematically studied by means of in situ heating and cooling transmission electron microscopy. It was found that the ${\text{Ni}}_{2}\text{FeGa}$ alloy was annealed into a well-defined $L{2}_{1}$…
The studies on the structure and electronic properties of hydrogenated metal embedded Al(12) cage clusters have been performed by density functional theory calculations. We have investigated aluminum cluster hydrides with 12 and 14 hydrogen atoms, respectively. Insertion of the Mg, Ca alkali metals remarkably enhances…
A room temperature ferromagnetic Fe doped ZnO bulk sample has been synthesized by co-doping 2 at% Mn with 2 at% Fe in ZnO. The final firing temperature for the preparation of the Zn 0.96 Mn 0.02 Fe 0.02 O sample is the same as the final firing temperature for the preparation of the Zn 0.98 Mn 0.02 O sample and in this…
The conditions for carbon nanotube synthesis in the bulk of arc discharges and on plasma-exposed solid surfaces are compared to reveal the main distinguishing features of the growth kinetics and explain the striking difference between the growth of the nanotubes in both cases. It is shown that this difference is due t…
We have investigated the electronic properties of defected boron nitride nanotubes (BNNTs) for spin-up and spin-down electrons by using the first-principle density functional theory. Two types of defects have been considered, vacancy and substitution of carbon and oxygen by boron or nitrogen. The formation energy calc…
The single-chain distribution in a poly(styrene- block -isoprene) block copolymer in the bulk state was studied by the combined method of transmission electron microtomography and three-dimensional mesoscale computer simulations. The local frustration of the block chains on a nanoscale can be analyzed using the size o…
The morphology of poly(4-phthalimide) (PPI) crystals was examined by using reaction-induced crystallization of oligomers during solution polymerization. Polymerizations of alkyl 4-aminophthalates such as 1-ethyl 4-aminophthalate (1EAP), 2-ethyl 4-aminophthalate, 1-hexyl 4-aminophthalate, and 2-hexyl 4-aminophthalate w…
OBJECTIVE: To test the null hypothesis that temperature has no effect on the force, moment, and moment to force ratio (M:F) of nickel-titanium (NiTi) and titanium molybdenum alloy (TMA) T-loops. MATERIALS AND METHODS: Twelve symmetrical T-loops were constructed from NiTi and TMA rectangular wires (N = 24). For each ma…
Magnetoelectric (ME) materials being at the same time antiferromagnetic (AF) are proposed to be used in spintronic applications, e.g. for Magnetic Random Access Memory (MRAM). The main idea considers exchange coupling to a ferromagnet at the interface of the ME material and corresponding exchange bias (EB). The propos…
By using non-collinear density-functional calculations, we clarified the magnetic states of zigzag-edged graphene nanoribbons (ZGNRs). In the novel non-collinear states that were found, the angle θ between the magnetic moments at the two edges were canted , i.e., 0 <θ< 180°, which was in contrast with the case of anti…
Single phase BiFeO3 (BFO) thin films were fabricated by chemical solution deposition on Pt/Ti/SiO2/Si(100) structures. J-E (current density vs. electric field) and P-V (polarization vs. voltage) characteristics were measured at room temperature (RT). It is shown in J-E characteristics that sharp increase in the curren…
Multi-walled carbon nanotubes (MWNTs) of various diameters have been analyzed by Raman spectroscopy to clarify the influence of the diameter of MWNTs on their Raman spectra. The G-band frequency of MWNTs determined by curve fitting decreases with increasing tube diameter for diameters less than around 20 nm, beyond wh…
We investigate the structure and dynamics of biphasic colloidal mixtures composed of coexisting attractive and repulsive microspheres by confocal microscopy. Attractive gels formed in the presence of repulsive microspheres are more spatially homogeneous and, on average, are both more locally tenuous and have fewer lar…
A new class of two-dimensional (2D), pi-conjugated, skewed H-shaped co-oligomers of phenylene vinylene and phenylene ethynylene (11a- d, termed H-mers) were synthesized using Sonogashira coupling and Wittig-Horner reactions as the key steps. Electronic and spectroscopic properties of the H-mers were investigated by UV…
A recently developed ultrasound technique is evaluated by measuring the behavior of a cavitation bubble that is induced in water by a femtosecond laser pulse. The passive acoustic emission during optical breakdown is used to estimate the location of the cavitation bubble's origin. In turn, the position of the bubble w…
The influence of Two Step Sintering and Spark Plasma Sintering processes on the microstructure of three kinds of oxide ceramics was studied. Al2O3 (with initial particle size of 240 nm), ZrO2 (60 nm, stabilized with 3 mol% Y2O3) and SrTiO3 (50 nm) powders were cold isostatically pressed and pressureless sintered with…
Experiments and simulations on the scattering of hyperthermal Ar from a C(0001) surface have been conducted. Measurements of the energy and angular distributions of the scattered Ar flux were made over a range of incident angles, incident energies (2.8-14.1 eV), and surface temperatures (150-700 K). In all cases, the…
Bounded charges induced by the polarization gradient in finite-size ferroelectrics are known to produce the unfavorable depolarization electric field that suppresses the uniform ferroelectric state. To reduce the depolarization energy the non-uniform vortex (toroidal) state is formed inside ferroelectric nano-particle…