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。
Structures for realizing hole-doped MgB$_2$ without appealing to chemical substitutions are proposed. These structures which consist of alternating MgB$_2$ and graphene layers have small excess energy compared to bulk graphite and MgB$_2$. Density functional theory based first-principles electronic structure calculati…
Abstract The pyrolysis of an epoxy resin and the fire behavior of corresponding carbon fiber‐reinforced composites, both flame‐retarded with either 10‐ethyl‐9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene 10‐oxide or 1,3,5‐tris[2‐(9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene 10‐oxide‐10‐)ethyl]1, 3,5‐triazine‐2,4,6(1H,3H,5H)‐t…
In this work, we study the electrodynamics of metamaterials that consist of resonant non-magnetic inclusions embedded in an epsilon-near-zero (ENZ) host medium. It is shown that the inclusions can be designed in such a way that both the effective permittivity and permeability of the composite structure are simultaneou…
Ring-a-ring o'rods: Hybrid gold/polymer core–shell nanorods spontaneously organize into ringlike arrays when a drop of their solution is dried on a substrate. The process is highly reproducible and generates thousands of well-defined rings of nanorods in a matter of seconds (see TEM image). Studies revealed that water…
Colloids have increasingly been used to characterize or mimic many aspects of atomic and molecular systems. With confocal microscopy these colloidal particles can be tracked spatially in three dimensions with great precision over large time scales. This review discusses equilibrium phases such as crystals and liquids,…
Abstract SiO 2 /Poly(3‐aminophenylboronic acid) (PAPBA) composites were synthesized under different experimental conditions, using ultrasonic irradiation method. Polymerization was carried out in the presence of sodium fluoride and D ‐fructose to anchor 3‐aminophenylboronic acid groups on to SiO 2 surface. The SiO 2 /…
Single-crystalline copper sulfide (beta-Cu2S) nanocrystals (NCs) were grown in situ on multiwalled carbon nanotubes (MWCNTs) by the solvothermal method. The morphology of the Cu2S NCs was varied from spherical particles (av size=4 nm) to triangular plates (av size=12 nm) by increasing the concentration of the precurso…
As-prepared, single-crystalline bismuth ferrite nanoparticles show strong size-dependent magnetic properties that correlate with: (a) increased suppression of the known spiral spin structure (period length of approximately 62 nm) with decreasing nanoparticle size and (b) uncompensated spins and strain anisotropies at…
The nonstoichiometric Al-rich single-crystal mullite nanocolumns were prepared by sol-gel method through the self-catalyzed growth process. The rectangular nanocolumns are straight and uniform with a width of 100–150 nm and length of 3–4 μm. Detailed structural characterizations suggested that the growth of this novel…
Abstract Miscibility studies have been conducted on solutions of blends of polyacrylamide (PAAm) and polyethylene glycol (PEG) over an extended range of concentrations in water. The ultrasonic velocity, viscosity, density, and refractive index of the blends have been measured for different compositions viz., 0/100, 10…
Deep level transient spectroscopy measurements were performed to investigate the effect of Nb2O5 and Cr2O3 on the electronic states of SnO2-based varistors. Two electron traps, Ec−0.30(±0.01)eV and Ec−0.69(±0.03)eV, were identified in both SnO2–CoO–Nb2O5 and SnO2–CoO–Nb2O5–Cr2O3 varistors. These two traps could be ass…
Abstract The magnetic structure of the olivine type Mn 2 GeSe 4 is investigated by powder neutron diffraction between 2 K and ambient temperature. Based on a number of “magnetic reflections” occurring below T c = 66 K a model for the magnetic structure of the Mn 2+ ions (d 5 ) is derived by structure refinements based…
Abstract Electropolymerization of poly‐( o ‐phenylenediamine) (PoPD) film was performed in a micellar aqueous solution containing sodium dodecyl benzene sulfate (SDBS) by cyclic voltammetry at conducting glass electrode. The experimental results showed that the anionic micelle, i.e., SDBS, can greatly catalyze the ele…
Abstract Rubbery polymer scaffolds for tissue engineering were produced using templates of the pore structure. The last step in the fabrication process consists of dissolving the template using a solvent that, at the same time, swells the scaffolding matrix that was a polymer network. Sometimes the polymer matrix is s…
Abstract Rachford-Rice iterations are widely used in equation-of-state (EOS) flash calculations to determine phase equilibrium compositions from constant equilibrium ratios (K-values). The method, however, can be slow to converge and in some cases may not converge at all. This paper presents a simpler and more robust…
We report on a thermodielectric bistability in dual frequency nematic liquid crystals (LCs) caused by the anisotropic nature of dielectric heating and director reorientation in an electric field. The bistability is a result of the positive feedback loop: director reorientation --> anisotropic dielectric heating --> di…
We report a comparison of the specific-heat measurements on isoelectronic Cu-Zn-Al shape-memory alloys in the parent cubic phase $(L{2}_{1})$ and in the close-packed martensitic phase $(18R)$. Measurements were made by thermal-relaxation calorimetry over the temperature range $1.9\ensuremath{\leqslant}T\ensuremath{\le…
The light-emission and current-voltage properties of n-type nanoporous silicon (n-NPS) with a hole assistance of buried p layer are explored. The influences of anodic current density on the formation, morphology, and properties of n-NPS are measured. Such n-NPS films have nanoscaled pores and high-aspect-ratio pillars…
Abstract This article reports the synthesis, characterization, and damping characteristics of semi‐interpenetrating (semi‐IPN) latex systems composed of poly n ‐butyl acrylate (PBA) core and poly n ‐butyl methacrylate (PBMA) shell. The IPN's were prepared by seeded emulsion polymerization using crosslinked PBA seeds w…
The authors found experimentally that carbon nanotube field-effect transistors (CNFETs) could exhibit n-type characteristics even though their electrodes consist of a large-work-function metal such as Co. To explain their result, which is contrary to the general belief that CNFETs with large-work-function electrodes a…