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 Polyaniline is a member of the class of electrically conducting polymers, having possible commercial applications such as coatings. Aqueous‐based polyaniline coatings are preferred over organic solvent or concentrated strong acid based coatings because water is not a pollutant. The overall goal of this study…
A new route has been developed to prepare rod-like nano-scaled ZnC2O4·2H2O whiskers using dodecylbenzenesulfonic acid sodium salt (DBS) as a template. Rod-like nano-scaled ZnC2O4·2H2O whiskers with diameters of 200–300 nm and lengths in the range of 5–20 µm were prepared successfully. The structure and morphology chan…
Electrostatic interactions play a key role in enzyme catalytic function. At long range, electrostatics steer the incoming ligand/substrate to the active site, and at short distances, electrostatics provide the specific local interactions for catalysis. In cases in which electrostatics determine enzyme function, orthol…
Recent results and speculations regarding the possibilities that space charges cause ageing in polymeric insulating materials subjected to a DC electric field are highlighted. Referring to polyethylene-based materials, data are reported that show the relation between accelerated degradation of insulation, the amount o…
Abstract We have synthesized [FeII(H-trz)3]n complex film by using ion-exchange resin(Nafion) as counter anion, and have found the spin crossover phenomenon about at 260 K. Moreover, we have proved the existence of straight one-dimensional Fe chain structure of [FeII(H-trz)3]n on Nafion by means of EXAFS.
The magnetocaloric material Gd 5 Si 1.5 Ge 2.5 has been synthesized and its crystal structures at 292 and 163 K are reported from single-crystal X-ray diffraction experiments. At room temperature, orthorhombic Sm 5 Ge 4 -type and twinned, monoclinic Gd 5 Si 2 Ge 2 -type phases coexist in single crystal specimens. This…
Data processing methods used to accurately determine the space charge and electric stress distributions in DC power cables using the pulsed electroacoustic (PEA) system are described. Due to the coaxial geometry and the thick-walled insulation of high-voltage cables, factors such as divergence, attenuation and dispers…
Aligned metal nanoparticles are connected using a second metal to produce bimetallic wires. The nanoparticles are electrodeposited along the step edges of a highly oriented graphite surface and, after being given a protective coating, joined by long nanowires which are also electrodeposited. Beaded structures are prod…
We discuss the behaviour of the dynamics of colloidal particles with a weak attractive interparticle interaction that is induced through the addition of polymer to the solvent. We briefly review the description of their behaviour in terms of the jamming phase diagram, which parametrized the fluid-to-solid transition d…
A sparse matrix multiplication scheme with multiatom blocks is reported, a tool that can be very useful for developing linear-scaling methods with atom-centered basis functions. Compared to conventional element-by-element sparse matrix multiplication schemes, efficiency is gained by the use of the highly optimized bas…
A study on the electron relaxation dynamics and thermal cooling of colloidal gold nanoparticles (see Figure) in air and water finds that the local energy exchange with the surrounding medium occurs on the picosecond time scale, comparable with the electron–phonon relaxation, while a slow heat dissipation by water ensu…
Abstract Novel bisthienylethene‐based tetraazaporphyrin and phthalocyanine hybrids (BTE–TAPs) were prepared as photo‐switching molecules. All new compounds were characterized by mass spectrometry (MS), 1 H NMR spectroscopy, elemental analysis, UV‐vis absorption, and luminescence spectroscopy. All BTE–TAP compounds und…
Abstract A generic method has been developed for the synthesis of crystalline metal nanowires or nanotubes (such as bismuth nanotubes, tungsten nanowires) from lamellar structures. In a typical process, lamellar surfactant/inorganic composite precursors are first prepared by reacting cationic or anionic surfactants wi…
An embedded-atom-method potential for tantalum (Ta) has been carefully constructed by fitting to a combination of experimental and density-functional theory (DFT) data. The fitted data include the elastic constants, lattice constant, cohesive energy, unrelaxed vacancy formation energy, and hundreds of force data calcu…
Very long and highly oriented potassium‐doped tungsten oxide nanowires (see Figure) can be synthesized using the simple technique presented here. The mechanism of nanowire formation is investigated and a vapor–liquid–solid mechanism is proposed. This novel method can be easily scaled up and can also be extended to the…
The tubular form of crystalline boehmite AlOOH was fabricated using AlCl3·6H2O as the alumina precursor in the presence of N-cetyl-N,N,N-trimethylammonium bromide surfactant, and tubular γ-Al2O3 was obtained by calcination of boehmite AlOOH at 520 °C.
Microbial reduction of Fe(III) in illite was studied to evaluate the possibility of microbial utilization of Fe(III) in sedimentary clays and to determine the effects of bioreduction on clay composition and structure. A subsurface bacterium ( Shewanella putrefaciens CN32) and illite separates (<0.2 μm) from St. Peter…
Abstract Composites of the tetra‐anion of the perylene dye N , N ′‐di(phenyl‐3,5‐disulfonic acid)perylene‐3,4:9,10‐tetracarboxydiimide (PBITS) with layered double hydroxides (LDHs) were formed by direct synthesis (co‐precipitation at constant pH). The LDHs were of the hydrotalcite (Mg–Al–OH and Zn–Al–OH compositions).…
Abstract Single‐crystalline barium titanate nanowires are synthesized using a solution‐based method, and their ferroelectric properties are investigated by scanning probe microscopy. Pristine nanowires have diameters ranging from 5 to 70 nm and lengths exceeding 10 μm, and they possess perovskite structures with a pri…
Field-tuned quantum tunneling in two single-molecule magnets coupled antiferromagnetically and formed a supramolecule dimer is studied. We obtain step-like magnetization curves by means of the numerically exact solution of the time-dependent Schrődinger equation. The steps in magnetization curves show the phenomenon o…