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。
Highly uniform and monodisperse Eu:YF 3 nanosized and submicrosized truncated octahedra are successfully prepared in large quantities using a facile hydrothermal approach assisted by a capping reagent, ethylenediaminetetraacetic acid disodium salt (Na 2 H 2 EDTA). X-ray diffraction, field emission scanning microscopy,…
Brownian molecular dynamics simulations are carried out on the self-assembly behavior of rod−coil diblock copolymers. The copolymer molecule is represented by a linear chain consisting of definite beads connecting by harmonic bond stretching potential. The rigidity of the rod block is introduced by harmonic potential…
We measured the temperature dependent resistivity, $\ensuremath{\varrho}(T)$, of the intercalated graphite superconductor ${\mathrm{CaC}}_{6}$ as a function of pressure up to 16 GPa. We found a large linear increase of critical temperature, ${T}_{c}$, from the ambient pressure value 11.5 K up to 15.1 K, the largest va…
Getting the green light: ZnS-coated Cd1−xZnxSe alloy nanocrystals are stable and efficient emitters, whose color can easily be tuned in the blue–green spectral range by changing the ratio of the metal precursors applied during synthesis. Incorporated into a polymer matrix, they can be used for the conversion of blue (…
The kinetics of hydrogen adsorption on IRMOF-8 by hydrogen spillover from a Pt/AC catalyst (activated carbon support) was studied at various pressures (0−100 atm) and temperatures (273−348 K). The sorbent studied was a mixture of IRMOF-8 and Pt/AC with added carbon bridges. The overall isosteric heats of adsorption (−…
Abstract Thermoplastic vulcanized (TPV) nanocomposites were prepared in a laboratory mixer using EPDM, polypropylene of different viscosities, maleic anhydride modified polypropylene, an organo‐clay, and a sulfur‐based curing system. Based on the obtained results from X‐ray diffraction, transmission electron microscop…
Porous metal films for optical humidity sensing were prepared from copper nanoparticles protected by a 2-3 nm carbon coating, a silicon tenside, and a polymeric wetting agent. Exposure to water or solvent vapor revealed an exceptional sensitivity with optical shifts in the visible light range of up to 50 nm for a chan…
Biopolymers have already been widely used to control the growth of inorganic particles. However, some of these natural macromolecules present an intrinsic chemical and structural variability that may influence their templating efficiency. We have therefore compared the ability of three different sources of alginate to…
The low-temperature structure of the frustrated spin-chain compound Ca$_3$Co$_2$O$_6$ is determined by the ground state of the 2D Ising model on the triangular lattice. At high-temperatures it transforms to the honeycomb magnetic structure. It is shown that the crossover between the two magnetic structures at 12 K ari…
Brownian dynamics simulations are used to study highly entangled solutions of semiflexible polymers. Bending fluctuations of semiflexible rods are signficantly affected by entanglement only above a concentration $c^{**}$, where $c^{**}\sim 10^{3}L^{-3}$ for chains of similar length $L$ and persistence length. For $c >…
Half-centimeter-high mats of vertically aligned single-walled carbon nanotubes were grown at 600 degrees C by point-arc microwave plasma chemical vapor deposition. The mats were produced from 0.5 nm of an Fe catalyst layer, thus showing one of the highest catalytic yields of approximately 105 times. The growth process…
The wavefronts from a point source in a solid with cubic symmetry are examined with particular attention paid to the contribution from the conical points of the slowness surface. An asymptotic solution is developed that is uniform across the edge of the cone in real space, the interior of which contains the plane lid…
We investigate the spin relaxation and spin dephasing of $n$-type GaAs quantum wells. We obtain the spin relaxation time $T_1$, the spin dephasing time $T_2$ and the ensemble spin dephasing time $T_2^{\ast}$ by solving the full microscopic kinetic spin Bloch equations, and we show that, analogous to the common sense i…
Cubic InN films were grown on top of a c-GaN buffer layer by rf-plasma assisted MBE at different growth temperatures. X-Ray diffraction investigations show that the c-InN layers consist of a nearly phase-pure zinc blende (cubic) structure with a small fraction of the wurtzite (hexagonal) phase grown on the (111) facet…
Understanding the mechanism of nucleation of the stable phase inside the metastable parent phase during a first order phase transition has been a subject of outstanding interest in natural science. The problem becomes even more challenging as the spinodal is approached. In this work, we have undertaken extensive compu…
Time- and spectrally-resolved PL from a periodic array of InP/InAs/InP core-multishell nanowires is presented. InAs layer shows multipeak PL spectra. PL decay is nonexponential and very slow, with decay rate depending on energy.
ABSTRACT MRI has been employed to elucidate the migratory behavior of stem/progenitor cells noninva‐sively in vivo with traditional proton ( 1 H) imaging of iron oxide nanoparticle‐labeled cells. Alternatively, we demonstrate that fluorine ( 19 F) MRI of cells labeled with different types of liquid perfluorocarbon (PF…
A class of self-assembling peptide nanofiber scaffolds has been shown to be an excellent biological material for 3-dimension cell culture and stimulating cell migration into the scaffold, as well as for repairing tissue defects in animals. We report here the development of several peptide nanofiber scaffolds designed…
Because of Klein tunneling, electrostatic potentials are unable to confine Dirac electrons. We show that it is possible to confine massless Dirac fermions in a monolayer graphene sheet by inhomogeneous magnetic fields. This allows one to design mesoscopic structures in graphene by magnetic barriers, e.g., quantum dots…
Owing to its superior tribological and mechanical properties with corrosion resistance, biocompatibility, and hemocompatibility, diamond-like carbon (DLC) has emerged as a promising material for biomedical applications. DLC films with various atomic bond structures and compositions are finding places in orthopedic, ca…