Materials Literature
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The crystal structure of BaMn 0.4 Fe 0.6 O 2.73, a recently identified oxygen-deficient 10H-type hexagonal perovskite in the system BaMn 1 - x Fe x O 3 - y, has been established by a combination of electron microdiffraction and neutron diffraction. The structure (space group P 6 3 / mmc, a = 5.74435(5) Å, and c = 24.0…
Optical properties of Pr3+ doped TeO2–PbO glass were investigated by resonant excitation of H43→D21 transition at ∼586nm. The decay time of D21 level, the energy transfer (ET) rates from the D21 level to other Pr3+ states, and the frequency upconversion process which leads to emission at 484nm (P03→H43 transition) wer…
This work presents a study of the thermal lens technique to quantify the thermo-optical coefficients d s /d T (optical path change with temperature), thermal diffusivity and conductivity of tellurite glasses doped with Yb 3+ . The glasses present binary, ternary and quaternary compositions. Yb 3+ ions allow the determ…
The liquid crystal phase gratings were prepared using a polarization holographic exposure on poly(vinyl cinnamate) or photocross-linkable polymer liquid crystal (PCLC) films. Anchoring strength between the photoalignment layer and low-molar-mass liquid crystal is a very important role to realize the liquid crystal gra…
Recently, it has been argued [N. M. Pugno and R. S. Ruoff, J. Appl. Phys. 99, 024301 (2006)] that available carbon-nanotube (CNT) tensile strength data do not obey the “classical” Weibull statistical model. In this paper we formulate Weibull’s theory in a manner suitable for assessing CNT fracture-strength data and de…
In this work we show that a reparametrized Tersoff potential accurately reproduces the bond length variations observed in ternary Ga1−xInxAs mixed crystals. The reparametrization is based on accurate first-principles electronic structure calculations. Previous parametrizations of the Tersoff potential for GaAs and InA…
Abstract The preparation of a series of novel homopolymers and copolymers containing bisazobenzene chromophores with side‐on structure in the side chains via atom transfer radical polymerization (ATRP) were presented. UV–vis spectra of the thin films of these polymers under irradiation of 488 nm Ar + laser suggested t…
A new solid solution of (1−x)Ba(Zn1∕3Nb2∕3)O3−xPbTiO3 [(1−x)BZN−xPT] has been synthesized in the form of ceramics by solid state reactions and characterized by means of x-ray diffraction, dielectric spectroscopy, and ferroelectric measurements. A partial solid state phase diagram of the binary system is established. I…
The synthesis and photopolymerization of alkaline-developable hyperbranched polyurethane (HBPUMA-COOH) were examined. The reaction of dicyclohexylmethane 4,4‘-diisocyanate (CMDI) and trimethylolpropane (TMP) in the presence of 2-methacryloyloxyethyl isocyanate (MOI) was carried out to give the soluble hyperbranched po…
Hydrogenated germanium carbides have been produced by x-ray activated–chemical vapor deposition from germane/ethyne or germane/allene systems. The chemical composition and structure of the reaction products as a function of the hydrocarbon percentage in the irradiated mixture and of the solid annealing temperature hav…
In this Letter we study electron interference in nanotube loops. The conductance as a function of the applied voltage is shown to oscillate due to interference between electron beams traversing the loop in two opposite directions, with slightly different velocities. The period of these oscillations with respect to the…
Nitrogen-doped single-walled carbon nanotubes (N-SWNTs) are directly grown on SiO 2 /Si substrates at 450 °C with methane and ammonia gases by water-plasma chemical vapour deposition. The strongest radial breathing mode peak in Raman spectra of the grown N-SWNTs, probed with a 633 nm laser excitation, was assigned to…
Ultrasonic pulse velocity testing was carried out to perform nondestructive quality control of refractory plates used as substrates in fast firing of porcelain whiteware. Two cordierite‐mullite refractory compositions characterized by different microstructure morphologies and crack propagation behavior were investigat…
The modification of periodic mesoporous silica with organic groups following an optimized metalorganic route is described. Organolithium and Grignard reagents ( n -butyllithium and allyl-magnesium bromide) were used to directly substitute silicon atoms with organic moieties in the channel walls of the silica host. A d…
We report in this work the optical properties of Er3+-doped Y2O3, deposited by radical enhanced atomic layer deposition. Specifically, the 1.53μm absorption cross section of Er3+ in Y2O3 was measured by cavity ring-down spectroscopy to be (1.9±0.5)×10−20cm2, about two times that for Er3+ in SiO2. This is consistent wi…
Abstract A series of amide‐plasticized soy protein isolate materials were prepared by hot compression‐molding techniques at 140°C and 20 MPa. The plasticizing efficiency of amides was in the order of formamide > acetamide > acrylamide resulting from scanning electron microscopy, optical transmittance and differe…
Abstract A new kind of dendronized polymer brush with metallo‐supramolecular polymer side chains was fabricated by a combination of macromonomer and graft‐to approach. The alternating copolymers of maleic anhydride and styryl macromonomers pendant with Fréchet‐type dendrons of three generations were reported previousl…
Continuous nanofibres fabricated by the electrospinning technique have found increasing applications (e.g. nanofibre composites, nanofibre devices, bioengineering tissue scaffolding, etc). For a nanofibre network subjected to a small external perturbation, the fibre segments within the network may deflect and stick to…
The interaction of crystallographic twin boundaries with an external magnetic field as a mechanism for shape deformation is analyzed theoretically and applied to the alloy Ni2MnGa. A defect, modeled as a Gaussian strain distribution interacting elastically with the twin boundary, is localized in one of the two variant…
We study experimentally and numerically the transmission properties of the multilevel dendritic structures. This kind of structure produces one electric resonance and multiple magnetic resonances in different frequencies. In the case of dendritic structure alone, we can tune the magnetic resonance peak into the negati…