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。
Abstract To facilitate the characterization of polymer networks, a comparison was made between branching theory and Monte Carlo simulations using an amine‐cured epoxy as an example for step‐growth polymer networks. The primary objective was the validation of the simulation results with the existing statistical theorie…
Abstract The mechanical properties of flyash‐filled natural rubber were investigated and compared with those filled with calcium carbonate. A number of composites with varying percentage of the fillers were prepared using a two‐roll mill and molded on compression molding press. Specimens were subjected to mechanical t…
The average magnetic susceptibilities for trivalent rare earth (R3+) ions in polycrystalline tetragonal rare earth oxybromides (ROBr, R = Ce–Nd, Sm, Eu, and Tb–Yb) were measured between 2 and 298 K. The susceptibilities of all ROBr follow the paramagnetic Curie–Weiss behaviour down to low temperatures except for SmOBr…
Abstract In vitro degradation of poly( L ‐lactic acid) (PLLA) fibers was studied by incubating the fibers in phosphate buffered saline (pH 7.4) at 37°C for 35–45 weeks. Three kinds of PLLA fibers with different diameters and different initial viscosity‐average molecular weights were tested. The viscosity‐average molec…
Synthetic hydrocerussite [trilead dihydroxide dicarbonate, Pb(3)(CO(3))(2)(OH)(2)] can be easily obtained, as a white powder, by the action of carbon dioxide and water on either lead or litharge at pH 4-5. This compound is also found in lead corrosion technological products as a fine-grained phase. Ab initio crystal s…
Magnetic nanoparticles (Ni, CoNiFe) with diameters ranging from 30 to 200 nm were synthesized by electrodeposition using carbon nanowalls as templates. A series of experiments have been carried out to study the formation mechanism of nanoparticles. It was found that the formation of nanoparticles instead of continuous…
The crystallization of polymeric and metallic materials normally occurs under conditions far from equilibrium, leading to patterns that grow as propagating waves into the surrounding unstable fluid medium. The Mullins-Sekerka instability causes these wave fronts to break up into dendritic arms, and we anticipate that…
Hybrid systems consisting of the conducting layers of organic donor molecules and the magnetic layers of inorganic anions have been focused on as possible bifunctional materials, whose conducting properties can be tuned by controlling the magnetic state of the anion layers on an application of magnetic field. Here we…
We report on a neutron spin echo investigation of the intermediate scale dynamics of polyisobutylene studying both the self-motion and the collective motion. The momentum transfer (Q) dependences of the self-correlation times are found to follow a Q(-2/beta) law in agreement with the picture of Gaussian dynamics. In t…
A quantitative analysis is presented for the site-selective Fe K-edge absorption spectra of Prussian Blue: Fe(4)[Fe(CN)(6)](3) x xH(2)O (x = 14-16). The site-selective spectra were recorded using high-resolution fluorescence detection of the K beta emission from a polycrystalline sample. The K beta fluorescence lines…
Poly(amidoamine) PAMAM dendrimers of various generations (generation 2 to generation 6) with different surfaces (amine, Tris, and pivalate) were used as organic templates to form complexes and nanocomposites of silver. Starting from silver salts and PAMAM dendrimers, first a silver−dendrimer complex and then a nanocom…
Extensive molecular dynamics simulation studies of particles interacting via a short-ranged attractive square-well potential are reported. The calculated loci of constant diffusion coefficient D in the temperature-packing fraction plane show a reentrant behavior, i.e., an increase of diffusivity on cooling, confirming…
All four isotropic contributions to the NMR fluorine−fluorine coupling constants (Fermi contact, FC, spin-dipolar, SD, paramagnetic spin−orbit, PSO, and diamagnetic spin−orbit, DSO) have been calculated for 2,6-difluoropyridine, 2,4,6-trifluoropyridine, perfluoropyridine, and 2-Br-3,4,5,6,7,8-hexafluoroquinoline by me…
The interaction between spherical particles covered with end-grafted polymers (brushes) immersed in a polymer melt is studied theoretically. It has been known for some time that two densely grafted brushes may attract each other in the presence of a chemically identical polymer melt. In this study we show that this at…
In this paper, we investigate the electron self-energy and effective mass in a single heterostructure using Green-function method. Numerical calculations of the electron self-energy and effective mass for GaAs/AlAs heterostructure are performed. The results show that the self energy (effective mass) of electron, which…
We have measured the magnetoresistance in a series of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ samples with $0.033<~x<~0.053$ for three mutually orthogonal orientations of the applied magnetic field. The spontaneous resistivity anisotropy (SRA) in these materials is negative (i.e., the samp…
ABSTRACT Fatigue crack initiation was studied in a bimodal TA6V titanium alloy. A ghost structure inherited from the forging process, the scale of which is roughly 100 times the apparent grain size, was found to govern the initiation process. In these macrograins, that we have labelled macrozones, most of the primary…
An analytical result for the renormalization of the jump of the heat capacity Delta C/C_N by the anisotropy of the order parameter is derived within the framework of the very recent model proposed by Posazhennikova, Dahm and Maki [cond-mat/0204272, submitted to Europhys. Lett.], for both oblate and prolate anisotropy.…
Some references for the breaking strength of fused silica fibers compiled in 1999.
The bi-continuum model composed of two interpenetrating and dynamically coupled material continua is analysed as a simplified but relatively accurate way to describe some physical phenomena in crystalline solids. The essential novelty of our approach consists in treating a crystalline medium as bi-continuum, even if t…