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。
This paper reports a successful application of variable-temperature diffuse reflectance spectroscopy for the study of the solid-state thermo- and photochromism of salicylideneanilines, which belong to a class of the most well-known chromic organic compounds. This study disproves fundamental aspects that have been wide…
Particle anisotropy determines the way nanoparticles self-assemble, as shown in the picture. Gold and silver spheroids, rods, and plates with length-to-width ratios ranging from 1 to 25 show different liquid-crystalline order structures. These structures are analogous to the entropy-driven ordering that occurs at high…
Using molecular dynamics computer simulation, we have calculated the velocity autocorrelation function and diffusion constant for a variety of solutes in a dense fluid of spherical solvent particles. We explore the effects of surface roughness of the solute on the resulting hydrodynamic boundary condition as we natura…
Dying to be seen: A series of water-soluble and highly fluorescent perylenetetracarboxdiimides (PDIs) have been synthesized in high yields by introducing charged groups into the bay region of PDI (see picture; C gray, H white, S yellow, O red). They can be used for staining living cells as they are nontoxic.
In this paper we present a theoretical study of the third-order nonlinear optical properties of poly(diphenyl)polyacetylene (PDPA) pertaining to the third-harmonic-generation (THG) process. We study the aforesaid process in PDPA's using both the independent electron Hueckel model, as well as correlated-electron Parise…
We have carried out scanning tunneling microscopy experiments under ultrahigh vacuum condition to study the morphology of ultrathin Ge films eposited on pristine Si(100) and ion-irradiated Si(100) self-affine fractal surfaces. The pristine and the ion-irradiated Si(100) surface have roughness exponents of alpha=0.19+/…
Extensive X-ray and neutron scattering experiments and additional transmission electron microscopy results reveal the partial decomposition of Nd2-xCexCuO4 (NCCO) in a low-oxygen-fugacity environment such as that typically realized during the annealing process required to create a superconducting state. Unlike a typic…
In this paper, a recently developed numerical technique [{\em Tuncer E and Guba{ń}ski S M, IEEE Trans Diel El Insul {\bf 8}(3)(2001) 310-320}] is applied to poly(propylene glycol) complex dielectric data to extract more information about the molecular relaxation processes. The method is based on a constrained-least-sq…
$YbInCu_{4}$ and its alloys present discontinuous, first order iso-structural transitions at pressure dependent temperatures $T_V(P)$, where a local moment phase coexist with a renormalized Fermi liquid phase. We show that along the coexistence line $T_V(P)$ the entropy of the large volume renormalized Fermi liquid ph…
We evaluate the optical gap and Stokes shift of several candidate 1 nm silicon nanocrystal structures using density functional and quantum Monte Carlo (QMC) methods. We find that the combination of absorption gap calculations and Stokes shift calculations may be used to determine structures. We find that although abso…
Flower-like ZnO nanostructures, which consisted of sword-like ZnO nanorods, have been prepared by an organic-free hydrothermal process. The XRD pattern indicated that the flower-like ZnO nanostructures were hexagonal. The SAED and HRTEM experiments implied that the sword-like ZnO nanorods were single crystal in nature…
RGB-Farbraum komplettiert: Die elektrochemischen und optischen Eigenschaften des ersten elektrochemisch hergestellten leitfähigen Polymers, das in seiner Neutralform grün ist, werden beschrieben. Seine außerordentlich hohe Stabilität ist ein entscheidender Schritt vorwärts auf dem Gebiet elektrochromer Polymere, da di…
Direct selective gas-phase epoxidation of propene with commercially viable conversion has been achieved with catalysts consisting of gold nanoparticles (3–5 nm) supported on large-pore (>7 nm) silylated mesoporous titanosilicates with Ba(NO3)2 as a promoter. The picture provides a plausible mechanism for the synergeti…
A new approach to fabricate polyelectrolyte microcapsules is based on exploiting porous inorganic microparticles of calcium carbonate. Porous CaCO3 microparticles (4.5-5.0 microns) were synthesized and characterized by scanning electron microscopy and the Brunauer-Emmett-Teller method of nitrogen adsorption/desorption…
Increasing population and a rising necessity for mobility and transportation require a growing environment protection. In the USA and in Europe legislative concluded new emission limits to reduce cold start emissions for passenger cars. A useful method to reduce HC and CO during the cold start of combustion engines is…
<div class="htmlview paragraph">The current paper presents improvements of a previous single-degree-of-freedom lumped parameter model with a nonlinear spring that could be used for preliminary design of headform impact safety countermeasures for normal impact with negligible headform rotation.</div> <di…
<div class="htmlview paragraph">Automotive manufacturers are continually pushing for reduced cost, increased fuel economy, lower emissions and improved performance. Magnesium is the lightest structural metal and has therefore enjoyed a double-digit annual growth in automotive applications since 1990, aimed at re…
<div class="htmlview paragraph">The application of two-component polyurethane (PU) foam materials for acoustical and structural performance enhancements in vehicle structures have increased significantly in the past ten years. The benefits include NVH management (through effective cavity sealing), body stiffness…
<div class="htmlview paragraph">Natural fiber mat (NMT) composites are ecologically and energetically beneficial because of their light-weight at high fibre content. This study demonstrated that the use of loose natural fibre in NMT process could lead to tremendous improvement in the shock absorption properties.…
<div class="htmlview paragraph">A simplified LCA model of a car, where the main body material is a parameter and only the GHG impact is calculated, has been built in order to investigate broad assumptions on material production and recycling. Indeed the benefits from weight reduction can be counterbalanced by th…