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。
The phonon confinement model is often used to analyze Raman scattering band shapes of porous silicon and hence to determine the size of crystallites embedded in the porous layer. We show in this paper, from backscattering Raman spectra, the importance to avoid using resonant excitation which would select a particular…
Abstract Lead‐free (1 − x )(Bi 0.5 (Na 0.85 K 0.15 ) 0.5 TiO 3 )‐ x BiAlO 3 (abbreviated as BNKT15‐BA, x = 0, 0.025, 0.050, 0.075, 0.100) piezoelectric ceramics were synthesized by a conventional solid‐state reaction method. The phase‐transition behavior in BNKT15‐BA ceramics with respect to changes in composition wer…
Abstract Transport properties, temperature‐dependent phonon‐limited electrical and thermal resistivities in the normal state of two‐dimensionally (2D) infinite‐fused zinc porphyrin with a directly meso ‐ meso ‐, β‐β‐, and β‐β‐linked array structure ZnP ∞ were theoretically calculated using linear‐response approach bas…
Abstract A novel conductivity composite from polyaniline (PANI) and layered zirconium phenylphosphonate (ZrPP) was carried out through in situ chemical oxidation polymerization by the addition of an appropriate amount of ammonium peroxodisulfate solution, and the relevant structure and properties were investigated. Th…
Abstract Graphene has attracted immense interest due to its unique electronic structure with conical bands and zero bandgap (Novoselov et al., Nature 438 , 197 (2005) 1 ), and high carrier mobility (Du et al., Nature Nanotech. 3 , 491 (2008) 2 , Bolotin et al., Solid State Commun. 146 , 351 (2008) 3 ). While field‐eff…
In this paper we present a kinetic model based on numerical simulations of a chemical vapor deposition (CVD) process. We discuss a model that is based on kinetics of the deposition rates to the material. Such a simple model can explain the experimental results. Based on experiments with Ti3SiC2 we verify our model. He…
Abstract In this work, we report the photoluminescence (PL) studies of the films produced by different methods from pristine single‐wall carbon nanotubes (SWNTs). The suspensions of CoMoCAT and HiPCO SWNTs were used to make two different types of films: the polymer films with embedded SWNTs and the SWNT films deposite…
Abstract A strategy to reduce the dependence on petroleum‐based building blocks and the disposal concerns of solid wastes was proposed by developing a novel polymer blend from bio‐based cellulose acetate butyrate (CAB) and poly(trimethylene terephthalate) (PTT). The thermodynamic immiscibility and the thermal behavior…
We developed a unified mesoscopic transport model for graphene nanoribbons, which combines the nonequilibrium Green's function (NEGF) formalism with the real-space π-orbital model. Based on this model, we probe the spatial distribution of electrons under a magnetic field, in order to obtain insights into the various s…
Abstract In this article, we report an interesting phenomenon of the glass transition temperature ( T g ) deviation of a hydrophilic polymer. Polyacrylamide (PAL) samples with different extents of chain entanglement were prepared by spray drying and solution casting. We found that the glass transition temperature incr…
Abstract The polarizabilities and first hyperpolarizabilities of nine recently synthesized compounds have been calculated ab initio to assess the effects of basis sets, of electron correlation (at the MP2 level), of frequency dispersion, and of the solvent within the polarizable continuum model, as well as to address…
Theoretical models of size effects in dielectric response according to DC bias field in submicrometer barium titanate ceramic system are discussed. The dielectric response contains two typical parts: intrinsic ferroelectric and the vibration of domain walls, and the total dielectric response is the summation of both.…
Abstract Due to pollution issue and dark color of carbon black, nonblack filler are getting more importance for reinforcing elastomer. EPDM‐kaolin composites with variable maleated EPDM concentration have been prepared by mixing on a two roll mill. Optimum cure time increases with increasing compatibilizer concentrati…
Many achiral polymers crystallize into spherulites with gigantic chirality, as is evident from spectacular images of periodic banding observed in a polarized optical microscope, arising from the twisting of the lamellae making up the spherulites. We present a new mechanism of the spontaneous chiral symmetry breaking,…
We report on several unusual properties of a graphene antidot created by a piecewise constant potential in a magnetic field. We find that the total probability of finding the electron in the barrier can be nearly one while it is almost zero outside the barrier. In addition, for each electron state of a graphene antido…
La0.67Ca0.33MnO3 thin films were epitaxially grown on miscut MgO(001) substrates by pulsed laser ablation. Electrical transport properties were studied by using an ultra high vacuum, four-probe STM system at different temperatures. Anomalous resistivity behavior and metal-insulator transition temperatures were found,…
Effects related with the attenuation and deflection suffered by an electron beam when it passes through a carbon conductive coating and an oxide film layer on the surface of bulk samples are studied by Monte Carlo simulations and energy dispersive spectroscopy with electron excitation. Analytical expressions are provi…
The crystal structures of Pb 2 Pd 3 Se 2 and superconducting Bi 2 Pd 3 Se 2 are investigated from single crystal X -ray diffraction. Thus, an enhanced view on structure trends can be given for the series Bi 2 M 3 Ch 2 and Pb 2 M 3 Ch 2 ( M = Ni, Rh, Pd, Ch = S, Se) including structure-property relations to superconduc…
Abstract Amino polysiloxanes (APSs) with different amino values and amino types were synthesized and applied to cotton fabrics. Softening and smoothening properties of the fabrics treated with APSs were investigated and evaluated by measuring wrinkle recovery angles and friction coefficients, and the morphological fea…
The surfaces of poly(urea-formaldehyde) (PUF) were modified by γ -glycidoxypropyltrimethoxy silane (KH560) in order to improve the interfacial bonding between self-healing PUF microcapsules and epoxy matrix. The modification mechanism between PUF microcapsules and KH560 was studied. X-ray photoelectron spectra (XPS) a…