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。
We examine the role of solution-phase polymer geometries on the favorability of forming oriented nanostructures from single conjugated polymer molecules formed from microdroplets of ultradilute solution. To our knowledge, this is the first time single molecule fluorescence correlation spectroscopy has been used to ext…
The electronic structures of molecular beam epitaxy (MBE)-grown GaAs and GaN have been studied by means of a technique using a newly developed surface-insensitive probe, namely, high-resolution hard X-ray (HX) synchrotron radiation ( h ν= 5.95 keV) photoemission spectroscopy (PES). The obtained valence band spectra an…
Novel inorganic/organic composite films of molybdates with photochromic properties have been prepared by self-assembly using alkylammonium ions as a supramolecular template. Both 1-hexadecylammonium/polyoxomolybdate (C16-Mo) and 1-octadecylammonium/polyoxomolybdate (C18-Mo) composite films have been successfully fabri…
Electronic properties of polarity-discontinued heterointerfaces between two perovskite band insulators, LaAlO 3 and SrTiO 3 , have been investigated. Various heterointerfaces with AlO 2 -LaO/TiO 2 -SrO and LaO-AlO 2 /SrO-TiO 2 termination including the mixtures of these two domains are fabricated in a single experimen…
The availability of extensive experimental data and remarkable intra- and interspecific variation in breeding behaviour make Achnanthes Bory sensu stricto an especially good model for studying the reproductive and population biology of pennate diatoms. In most Achnanthes species studied, auxospore formation is accompa…
Near complete stereospecific assignments of the prochiral methyl carbons of Leu and Val residues in malate synthase G, a 723 residue enzyme, are reported. Assignments were obtained on the basis of a 10% fractional (13)C-labeling strategy developed by Wüthrich and co-workers [Neri, D; Szyperski, T; Otting, G; Senn, H;…
Matrix metalloproteinase (MMP)-2 and MMP-9 are involved in keratinocyte migration and granulation tissue remodeling during wound healing. Thermal water cures are sometimes proposed as complementary treatment for accelerating healing of wounds resulting from burns and/or surgery, but their mechanisms of action remain u…
Abstract The effect of blending poly (methyl methacrylate) (PMMA) in various proportions with suitably stabilized and plasticized poly (vinyl chloride) (PVC) was studied with reference to their physical, mechanical, and thermal properties. The resulting morphologies of the various blends were also studied to find a su…
The evolution of the morphology of poly(trimethylene terephthalate) (PTT) samples subjected to different processing conditions was studied using polarized Raman spectroscopy. Three films (amorphous, hot drawn, and crystalline) were used to determine the structural origin of the vibrational bands in the Raman spectra.…
Photophysical properties of a series of polyisocyanides possessing porphyrin pendants (porphyrin polymers) were investigated by steady state and transient spectroscopic methods. The B (Soret)-band of the free base porphyrin polymers showed splitting indicating substantial exciton coupling in the porphyrin polymers due…
An investigation of the effect of hydrated lime on the permeability and compressibility of two Brazilian soils: a brown saprolitic soil, Soil 1, and a red lateritic soil, Soil 2, is presented. Details of the test methods and materials are given. The results obtained show that the coefficient of permeability of Soil 1…
To gain insight into how a naturally occurring scaffold composed of extracellular matrix (ECM) proteins provides directional guidance for capillary sprouting, we examined angiogenesis in whole-mount specimens of rat mesentery. Angiogenesis was studied in response to normal maturation, the injection of a mast cell degr…
We report a hydrothermal synthesis of single-crystalline nanocubes composed of lanthanum barium manganite (La 1 - x Ba x MnO 3 ) with three different doping levels ( x = 0.3, 0.5, and 0.6). The synthesis yields clearly faceted nanocubes with a pseudo-cubic perovskite structure. Typical nanocubes have sizes ranging bet…
Abstract Isolated corn hull arabinoxylan was dissolved in water and provided a clear solution. Plasticizer (glycerol, propylene glycol, or sorbitol) was added to the arabinoxylan solution at 0–20 wt % (film dry weight), which was cast into stable films. Film thickness ranged from 22 to 32 μm. Mechanical properties, mo…
Abstract Single‐walled carbon nanotubes were added to two different grades of polypropylene to produce composites. The composites were then melt‐spun into fibers, and the fibers were tested with both a conventional tensile pull tester and dynamic mechanical analysis. The changes in tensile properties were related to t…
Structural features of pentagonal Ag nanorods have been investigated by means of transmission electron microscopy (TEM). Cross-section observations directly reveal the remarkable fivefold twinning structure and related defects in this kind of nanomaterial. High-resolution TEM observations in combination with fast-Four…
Modification of ZnS-capped CdSe quantum dot (QD) surfaces with polyelectrolyte coatings and subsequent layer-by-layer deposition to build hierarchical structures are presented. Mercaptoacetic acid (MAA)-treated QDs were sequentially coated with polyallylamine (PAA) and polyvinylsulfonic acid (PVSA) and analyzed using…
Reconciling the apparently contradictory results of NMR and x-ray absorption fine structure measurements on the ferroelectric perovskite BaTiO3 gives insight into the character of the displacive and order-disorder components of the phase transitions of this material. The order-disorder component in the transition cons…
Pr 4f electronic states in Pr-based filled skutterudites PrT4X12(T=Fe and Ru; X=P and Sb) have been studied by high-resolution bulk-sensitive Pr 3d-4f resonance photoemission. A very strong spectral intensity is observed just below the Fermi level in the heavy-fermion system PrFe4P12. The increase of its intensity at…
We describe here a new approach to the synthesis of size-controllable polypyrrole/carbon nanotube (CNT) nanocables by in situ chemical oxidative polymerization directed by the cationic surfactant cetyltrimethylammonium bromide (CTAB) or the nonionic surfactant polyethylene glycol mono-p-nonylphenyl ether (Opi-10). Whe…