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 strain generated by an actuator material when subjected to an external force is a key performance parameter. However, very little is known about the performance of polymer actuator materials when subjected to external loads. Increasing external loads were applied to polypyrrole films and the actuator response was…
Calculations of one-electron spectral functions, optical conductivity and spin-wave energy in the Holstein double-exchange model are made using the many-body coherent potential approximation. Satisfactory agreement is obtained with angle-resolved photoemission results on La_1.2Sr_1.8Mn_2O_7 and optical measurements on…
Semiconductor spintronics will need to control spin injection phenomena in the non-linear regime. In order to study these effects we have performed spin injection measurements from a dilute magnetic semiconductor [(Zn,Be,Mn)Se] into nonmagnetic (Zn,Be)Se at elevated bias. When the applied voltage is increased to a few…
A three-dimensional packed vesicular assembly was successfully prepared by using an organic-inorganic hybrid, the Cerasome. This assembly was achieved by using an alternate layer-by-layer adsorption technique with the anionic and the cationic Cerasome derived from corresponding organoalkoxysilane amphiphiles. Adsorpti…
To exploit the size dependent properties of nanoparticles, it is essential to control the particle size. We show that injection of octanethiol into suspensions of ZnO particles can be used to quench particle growth. X-ray photoelectron spectroscopy studies of the adsorption of octanethiol on ZnO single crystals indica…
Zeolitic wood structures made by a seeded templating process offer new ways of investigating the complex wood morphology. The technique can also be used to create hierarchical porous zeolitic materials (see Figure). The seeded growth strategy shows potential for the extension to any organisms with hierarchical structu…
Films of single-walled carbon nanotubes have been obtained by simple evaporation of suspended nanotubes on a glass substrate. The technique has also been used to create patterned structures (see Figure) by treating the substrate before evaporation and thus creating hydrophobic and hydrophilic areas. The films showed o…
A “hybrid photochromic” molecule with intertwined tetraazaporphyrin and bisthienylethene (BTE) chromophores is presented. The key photo-process is the simultaneous cyclization of two BTE units (yielding the molecule shown in the Figure) with high quantum yield at RT, and with a strongly temperature-dependent yield for…
This article focuses on the synthetic approach to the preparation of calcium carbonate–organic hybrid materials, which are obtained by self-organization processes under mild conditions. In these processes, organic molecules such as functionalized polymers and aligned amphiphilic molecules on the surface play key roles…
Within a self-consistent Born approximation, the Hall conductivity of a two-dimensional graphite system in the presence of a magnetic field is studied by quantum transport theory. The Hall conductivity is calculated for short- and long-range scatterers. It is calculated analytically in the limit of strong magnetic fie…
The structure/bonding relationship in a series of intermetallic phases of Li with Al, Ga, and In was investigated by density functional theory and complemented by a model based on tight-binding theory and the method of moments. The combination of these two approaches provides a simple scheme which allows for both a co…
Abstract In this study, we examine the effects of heating, nucleation, cooling, and reheating on the thermal properties and structure of metallocene isotactic polypropylene (m‐iPP) that had been prepared initially in a standard state containing nearly equal amounts of the crystallographic α and γ phases. Heat treatmen…
Abstract In this study, three chromophores— p ‐nitroaniline, 4‐(4‐nitrophenylazo)aniline, and 4‐[( E )‐2‐{4‐[( E )‐2‐(4‐nitrophenyl)‐1‐diazenyl]phenyl}‐1‐diazenyl]aniline—were intercalated into layered aluminosilicate saponite and then dispersed into the polyurethanes matrix. The intercalated chromophore/saponite comp…
Abstract The phase behavior of a partially miscible blend of poly(ethylene oxide) (PEO) and cellulose acetate butyrate (CAB) and the crystalline microstructure of PEO in the blend were studied with differential scanning calorimetry (DSC), optical microscopy, and synchrotron small‐angle X‐ray scattering (SAXS) methods.…
The local structure of trace amounts of lead in an adsorbent matrix that contains a high concentration of iron and magnesium (Mg6Fe2(OH)16(CO3) x 3H2O) was successfully monitored by means of X-ray absorption fine structure spectroscopy combined with fluorescence spectrometry. A eutectic mixture of PbCO3 and Pb(OH)2 co…
A difference of two electrons: A tetranuclear cluster [MnIIMnIIMnIIMnIV(O)(pko)4(3,4-D)4]⋅2.5 CH3OH (Hpko=di(2-pyridyl)ketonoxime, H-3,4-D=3,4-dichlorophenoxy acetic acid) with a (μ4-O)Mn4 bridging moiety is reported (see core structure). This compound is the only example of a manganese cluster with a 2 e− difference…
A difference of two electrons: A tetranuclear cluster [MnIIMnIIMnIIMnIV(O)(pko)4(3,4-D)4]⋅2.5 CH3OH (Hpko=di(2-pyridyl)ketonoxime, H-3,4-D=3,4-dichlorophenoxy acetic acid) with a (μ4-O)Mn4 bridging moiety is reported (see core structure). This compound is the only example of a manganese cluster with a 2 e− difference…
An effective Hamiltonian ${H}_{\mathrm{eff}}$ is constructed for ${\mathrm{PbZr}}_{0.95}{\mathrm{Ti}}_{0.05}{\mathrm{O}}_{3}.$ It is parametrized using primarily ab initio results computed in the virtual-crystal approximation. The phase diagram depends sensitively on the energetic competition between the stable orthor…
No racemization occurs in the first reported enantioselective photochromic reaction. Upon irradiation with UV light, a single enantiomer of [2.2]metacyclophane-1-ene 1 a undergoes photocyclization to give a single enantiomer of tetrahydropyrene 1 b. Upon irradiation with visible light, 1 b is converted back cleanly in…
TiO2 in besonderem Licht: Die bemerkenswerten photochemischen Eigenschaften von TiO2 ermöglichen die einfache und präzise schrittweise Musterbildung kolloidaler Kristallfilme. Durch Bestrahlen wird auf einer TiO2-Oberfläche ein Muster aus hydrophoben und hydrophilen Stellen erzeugt; anschließend wird ein Film von mono…