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 effect of a linear monomer on thermomechanical properties and shape recovery behavior of an epoxy shape-memory polymer is studied. These shape-memory polymers are prepared from epoxy base resin, hardener and linear epoxy monomer. As the content of the linear monomer increases, the glass transition temperature ( T…
The ability of highly cross-linked thermoset materials to relax stresses by network chain segment mobility above or just below T g is generally limited. We describe materials in which some of the cross-links have been replaced by dimers of quadruple hydrogen-bonding ureidopyrimidinone (UPy) moieties, which act as reve…
We used low-energy electron microscopy (LEEM) and scanning tunneling microscopy (STM) to investigate domain structures of epitaxial few-layer graphene grown on SiC(0001). Dark-field (DF) LEEM images formed using (10) and (01) beams clearly indicate that bilayer graphene consists of two types of domains, which have thr…
Based on first-principles calculations, we propose an exchange-transfer mechanism to understand the distinctively different behaviors of Pd and Pt contacts on graphene. The feature of the mechanism is that the pi electrons on the graphene transferring to the Pd d_{xz} + d_{yz} orbital are largely compensated by the el…
A multiresponsive fluorescent switch based on diarylethene and terpyridine units was developed. It exhibits effective switchable fluorescence which can be controlled by UV/visible light or metal ion/EDTA in solution. More importantly, having low toxicity, it can enter live cells as a fluorescent probe and can also ser…
The electromagnetic wave propagation in an anisotropic dielectric media with two generic matrices $ε^{ij}$ and $μ^{ij}$ of permittivity and permeability is studied. These matrices are not required to be symmetric, positive definite, and even invertible. In the framework of a metric-free electrodynamics approach, compa…
The classical (over 100 years) oxygen ion conductor and theory for solid oxide fuel cells (SOFCs) have met critical challenges, which are caused by the electrolyte material, the heart of the SOFC. Ionic conductivity of 0.1 S cm−1 as a basic requirement limits conventional SOFC electrolyte material, yttrium stabilized…
Defects of Ge quantum dot arrays may affect the electrophysical, photoelectrical or optical properties of Ge/Si heterostructures as well as the functionality of devices produced on their basis. The defects of Ge quantum dot arrays formed at moderate temperatures on the Si(001) surface have been investigated by the ult…
The magnetic state of Nitrogen-doped MgO, with N substituting O at concentrations between 1% and the concentrated limit, is calculated with density-functional methods. The N atoms are found to be magnetic with a moment of 1 Bohr magneton per Nitrogen atom and to interact ferromagnetically via the double exchange mecha…
Muonium, and by analogy hydrogen, is shown to form a shallow-donor state in ${\text{In}}_{2}{\text{O}}_{3}$ and ${\text{SnO}}_{2}$. The paramagnetic charge state is stable below $\ensuremath{\sim}50\text{ }\text{K}$ in ${\text{In}}_{2}{\text{O}}_{3}$ and $\ensuremath{\sim}30\text{ }\text{K}$ in ${\text{SnO}}_{2}$ whic…
We have performed high-resolution neutron diffraction and inelastic neutron scattering experiments in the frustrated multiferroic hexagonal compounds RMnO_{3} (R = Ho,Yb,Sc,Y), which provide evidence of a strong magnetoelastic coupling in the whole family. We can correlate the atomic positions, the type of magnetic st…
Inclusion of heavy metal atoms in a polymer backbone allows transitions between the singlet and triplet manifolds. Interfacial dissociation of triplet excitons constitutes a viable mechanism for enhancing photovoltaic (PV) efficiencies in polymer heterojunction-based solar cells. The PV efficiency from polymer solar c…
We present for static density functional theory and time-dependent density functional theory calculations an all-electron method which employs high-order hierarchical finite element bases. Our mesh generation scheme, in which structured atomic meshes are merged to an unstructured molecular mesh, allows a highly nonuni…
We show that the origin of the universal optical conductivity in a normal $N$-layer graphene multilayer is an emergent chiral symmetry which guarantees that $\ensuremath{\sigma}(\ensuremath{\omega})=N{\ensuremath{\sigma}}_{\mathrm{uni}}$ in both low and high-frequency limits. [${\ensuremath{\sigma}}_{\mathrm{uni}}=(\e…
The low-frequency magneto-optical absorption spectra of bilayer Bernal graphene are studied within the tight-binding model and gradient approximation. The interlayer interactions strongly affect the electronic properties of the Landau levels (LL's), and thus enrich the optical absorption spectra. According to the char…
Orbital reconstruction at interfaces between ${\text{YBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{6}$ and SrO-terminated ${\text{SrTiO}}_{3}$ is studied using local spin-density approximation (LSDA) with intra-atomic Coulomb repulsion $(\text{LSDA}+U)$. The change in population of interfacial $\text{Cu}\text{ }3d$ orbitals res…
Biodegradable titanium dioxide (TiO(2))/whey protein isolate (WPI) blend films were made by casting denatured WPI film solutions incorporated with TiO(2) nanoparticles. X-ray diffraction, UV-vis spectra, and fluorescence spectra of the films showed the successful incorporation of TiO(2) nanoparticles into the WPI matr…
Graphene-based sheets that possess a unique nanostructure and a variety of fascinating properties are appealing as promising nanoscale building blocks of new composites. Herein, graphene oxide sheets are used as the nanoscale substrates for the formation of silver-nanoparticle films. These silver-nanoparticle films as…
Abstract BACKGROUND: Poly(ether amide)s have been well studied in terms of improving the physical and thermal properties of aromatic polyamides. Poly(ether amide)s of high enough molecular weight to be useful for industrial purposes are generally difficult to prepare. The objective of this project was to introduce a s…
Copper oxide films have been shown to be a promising electrode material for the direct production of hydrogen by the photoelectrochemical (PEC) decomposition of water. In this paper, we present our work in developing a hot-wall tubular CVD reactor for copper oxide film deposition using a solid-source copper precursor…