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 have studied a system composed of a hydrophobic aerosil (R812) dispersed in the liquid crystal 4- n -octyl-4‘-cyanobiphenyl (8CB) using the spin probe electron spin resonance (ESR) technique, and in particular, we have determined, for different aerosil concentrations, the temperature dependence of the orientational…
X-ray diffraction, Raman scattering, and X-ray photoemission of SrBi 2 Ta 2 O 9 powder sample (the Curie temperature of 310 °C) synthesized from a precursor solution showed that the crystal structure of the SrBi 2 Ta 2 O 9 unit cell was preserved from bulk to surface, and the surface had never been covered with metall…
Abstract Functional aliphatic copolyesters of succinic acid (SA) and citric acid (CA) were synthesized via direct copolycondensation in the presence of 1,4‐butanediol, with titanium(IV) butoxide as a catalyst. The effects of the comonomer and comonomer ratio on the polycondensation and the melting and glass‐transition…
Abstract Cellulose fibers with modified properties have been prepared from cellulose solutions in N ‐methylmorpholine‐ N ‐oxide (NMMO). Poly(ethylene oxide) as a hydrophilic modifier and polyethylene as a hydrophobic modifier were added to the spinning solution. Based on microscope examination and measurements of such…
Abstract Poly(ester carbonate)s with different compositions were synthesized by bulk polycondensation of 1,4:3,6‐dianhydro‐ D ‐glucitol with diphenyl sebacate and diphenyl carbonate in the presence of zinc acetate as a catalyst. Most of the poly(ester carbonate)s as well as the corresponding polycarbonate were amorpho…
Second-harmonic generation (SHG) measurements have been conducted in the ferroelectric liquid crystalline phase of a chiral bent-core molecule, $P\ensuremath{-}8\ensuremath{-}\mathrm{OPIMB}{6}^{*}.$ Well-aligned cells were obtained by applying an electric field parallel to the substrate surfaces. In-plane anisotropy o…
We study the dynamics of spontaneously spreading drops of viscous liquids on top of porous medium made by non-interconnected pores. A model for the single pore case is proposed on a theoretical basis and validated by molecular dynamics simulations. The generalization to the multiple non-interconnected pore cases allow…
The extraordinary optical transmission of a metallic film pierced by a two-dimensional subwavelength hole array, observed by Ebbesen et al , is explained using rigorous electromagnetic analysis and a phenomenological approach. The analysis is based on Li's Fourier-modal method extended to crossed gratings, which reduc…
To shed light on the interaction in molecule-based magnetic materials, the decamethylmetallocenium hexafluorophosphates, [(C(5)Me(5))(2)M](+) [PF(6)](-) with M = Cr, Mn, Fe, Co, and Ni, as well as the tetracyanoethenides, [(C(5)Me(5))(2)M](+) [TCNE](-) with M = Cr, Mn, Fe, and Co, have been investigated in the solid s…
We report the temperature dependence of the Flory−Huggins interaction parameter for three symmetric diblock copolymer systems containing poly(cyclohexylethylene) (PCHE): poly(cyclohexylethylene- b -ethylene) (CE), poly(cyclohexylethylene- b -ethylethylene) (CE E ), and poly(cyclohexylethylene- b -ethylenepropylene) (C…
Based on the Chen-M\"obius lattice inversion and a series of pseudopotential total-energy curves, a different method is presented to derive the ab initio interionic pair potentials for $B1$-type ionic crystals. Comparing with the experimental data, the static properties of $B1$- and $B2$-type NaCl are well reproduced…
The phase diagram of a system consisting of hard spheres with an attractive Yukawa interaction is computed by Monte Carlo simulations. Upon decreasing the range of attraction, we find the following scenarios: (a) a stable fluid-fluid and fluid-solid transition, a triple point with fluid-fluid-solid coexistence, and a…
Blazed diffractive elements are currently fabricated with continuous profiles or with staircase approximations. Blazed-binary gratings are more recent diffractive elements which implement continuous phase delays through a gradient-index artificial material with subwavelength binary etches. The performance of these dif…
Monte Carlo simulations of the magnetoelectric coupling between ferroelectric order and magnetic order in ferroelectromagnets are performed based on the Janssen model in which the electric and magnetic subsystems are coupled. The simulations reveal that a weak ferromagnetic transition can be activated both by the stro…
Molecular structures of 12 porphyrin analogues, Fe(III)(EtioP)X(1(a)-1(d)), Fe(III)(EtioCn)X(2(a)-2(d)), and Fe(III)(Etio-Pc)X(3(a)-3(d)), where X = F (a), Cl (b), Br (c), and I (d), are determined on the basis of X-ray crystallography. Combined analyses using Mössbauer, (1)H NMR, and EPR spectroscopy as well as SQUID…
We extend our original parametric formulation of the Fourier modal method to the case of lamellar gratings that are periodic in two directions. We provide numerical evidence that improved convergence rates can be obtained for dielectric and metallic gratings.
A significant reduction of absorption for single gamma photons has been experimentally observed by studying M\"ossbauer spectra of $^{\mathrm{57}}\mathrm{F}\mathrm{e}$ in a ${\mathrm{F}\mathrm{e}\mathrm{C}\mathrm{O}}_{3}$ crystal. The experimental results have been explained in terms of a quantum interference effect i…
Extended duration in situ variable-temperature atomic force microscopy performed on a series of coacervating hydrophobic peptides based on human elastin revealed a novel multistage surface assembly process. Formation of epitaxially arranged peptide rods was preceded by rapid expansion of a two-dimensional film on the…
We present the synthesis and characterization of new light-harvesting arrays containing two, four, or eight perylene-monoimide accessory pigments attached to a zinc porphyrin. Each perylene is substituted with one or three 4-tert-butylphenoxy substituents. A 4,3'- or 4,2'-diarylethyne linker joins the perylene N-imide…
The size-dependent transient photoconductivity in CdSe nanoparticles (NPs) has been investigated using time-resolved THz spectroscopy (TRTS). We find that the mobility increases with an r 4 dependence for NPs in the strong confinement regime and is governed by a restricted mean free path for NPs in the weak confinemen…