Materials Literature
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We show how the phase modulation depth in twisted nematic liquid crystal displays (TNLCDs) can be increased dramatically by selecting a polarization configuration with a reduced mean intensity transmission. This phenomenon, which we have validated with various devices, is shown here for a device that presents a phase-…
A rotating magnetic field (RMF) is used in crystal growth applications during the solidification process in order to improve the crystal quality. Its influence on the convective flows in molten metals and on their stability is studied here in the case of a horizontal infinite cylindrical channel subjected to a longitu…
NiO nanoparticles have been successfully prepared by dissolution-reprecipitation of micro-sized NiO powder from aqueous ammonium hydrogencarbonate solution in the presence of urea followed by calcination at 400°C for 1 h. The products were characterized by simultaneous thermal analysis (TG-DTA), X-ray diffraction (XRD…
The CdTe quantum dots (QDs) are synthesized at room temperature in a record minimum time of 5 min by mechanical alloying the stoichiometric mixture of Cd and Te powders under Ar in a high energy planetary ball mill. Microstructure characterization of ball milled CdTe powders by x-ray diffraction employing the Rietveld…
Although conventional ionomers have been studied for more than 40 years, reports of ionomers prepared using aqueous core–shell nanoparticle dispersions are lacking. In this study we examine the structure and properties of new soft core–shell elastomeric nanoparticles and ionomer films. The nanoparticles consist of a s…
The electronic and magnetic properties of pure and Mn-doped armchair and zigzag ZnO nanotubes were studied using density functional theory with the generalized gradient approximation. The calculated results show that all of the pure ZnO nanotubes are nonmagnetic and have relatively uniform band gap of 1.66 eV at Γ-poi…
Abstract Micron‐sized fibers of UHMWPE reinforced with CNT were fabricated by the electrospinning process. Conditions for a metastable mutual solution of UHMWPE and CNTs were found at elevated temperature. These solutions were used for electrospining using a device having controlled temperature and gaseous environment…
We study theoretically behavior of thermal massless Dirac fermions inside graphene-based Ferromagnetic |Insulator| d-wave/s-wave superconductor (F|I|d and F|I|S) junctions in the ballistic regime. We employ Dirac–Bogoliubov–de Genne formalism and use Dirac–BdG wave functions within the ferromagnetic, normal, and super…
Nearly monodisperse core–shell Fe 3 O 4 /SiO 2 microspheres have been prepared via a glycol reduction method followed by a modified Stöber process. The thickness of the silica shells can be tuned in the range 33–53 nm by varying the amount of tetraethyl silicate (TEOS) during syntheses. The magnetic composite microsph…
We study the effect of electron beam irradiation on the bending modulus of multiwall carbon nanotubes grown by chemical vapor deposition. Atomic force microscopy observations of the nanotube deflection in the suspended-beam geometry suggest an internal, reversible stick-slip motion prior to irradiation, indicating pre…
The phase state of Pb0.97La0.02(Zr0.42Sn0.40Ti0.18)O3 (PLZST2) ceramics was studied by transmission electron microscopy analysis as well as polarization versus electric field (P-E) hysteresis loops. The initial state of this PLZST2 composition is ferroelectric (FE) and it transforms into antiferroelectric (AFE) as tem…
Hyperbranched polymers (HBPs) formed by the self-condensing vinyl polymerization (SCVP) or self-condensing ring-opening polymerization (SCROP) of monomer AB activated by stimuli with various reactivities were investigated by the generating function method. Two different cases were discussed: in case I, the concentrati…
Two new high-pressure phases of LiGaO2 have been discovered by direct compression of orthorhombic wurtzite-type LiGaO2 at pressures between 7 and 22 GPa and the temperatures of 25–2000 °C by means of the multianvil apparatus. The new intermediate phase recovered above 13 GPa at room temperature has been determined as…
The ferromagnetic-metal (FM) to antiferromagnetic-insulator (AFI) transition, near 250 K, has been induced in epitaxially shear-strained La0.67Ca0.33MnO3/NdGaO3(001) films, although they are doped for a FM ground state. We showed that for these films the phase diagram can feature the five regions of paramagnetic-insul…
“3ω” experiments aim at measuring thermal conductivities and diffusivities. Data analysis relies on integral expressions of the temperature. In this paper, we derive new explicit analytical formulations of the solution of the heat diffusion equation, using Bessel, Struve, and Meijer-G functions, in the 3ω geometry for…
The paper analyzes constitutive behavior of phase-transforming materials and metal powders loaded by shock waves. A two-phase material model developed earlier is extended to the case of materials with strength. Available experimental free surface velocities of iron samples under the α-ε phase transition and shock velo…
Supramolecular cationic structures of (CHDA 2+ )(DCH[18]crown-6) 2 were introduced into [Ni(dmit) 2 ] − salts (where CHDA 2+, DCH[18]crown-6, and dmit 2− represent cis -cyclohexane-1,4-diammonium, meso -dicyclohexano[18]crown-6, and 2-thioxo-1,3-dithiole-4,5-dithiolate, respectively). The crystal polymorphs of (CHDA 2…
Photoinduced refractive index changes are investigated as a function of composition in Ge–As–Se chalcogenide glass by measuring the formation of Bragg reflectors photo-imprinted in polished glass discs. It is shown that the glass network connectivity has a strong effect on the photostructural changes which decrease dr…
Poly(N,N-dimethylacrylamide) (PDMA) brushes are successfully grown from unplasticized poly(vinyl chloride) (uPVC) by well-controlled surface-initiated atom transfer radical polymerization (SI-ATRP). Molecular weights of the grafted PDMA brushes vary from ≈ 35,000 to 2,170000 Da, while the graft density ranges from 0.0…
Finished leather waste resulting from footwear production is mainly managed by landfilling, thus wasting the contained resources. Recycling by incorporating these wastes in new composites would be a more sustainable option. In this work, styrene butadiene rubber and acrylonitrile butadiene rubber based compounds were…