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 conductance of metallic graphene nanoribbons (GNRs) with single defects and weak disorder at their edges is investigated in a tight-binding model. We find that a single edge defect will induce quasilocalized states and consequently cause zero-conductance dips. The center energies and breadths of such dips are stro…
We show that the manifestation of quantum interference in graphene is very different from that in conventional two-dimensional systems. Because of the chiral nature of charge carriers, it is not only sensitive to inelastic, phase-breaking scattering, but also to a number of elastic scattering processes. We study weak…
When a methanol reforming−membrane reactor is employed as a hydrogen generator for a proton exchange membrane fuel cell, we should simultaneously achieve three important aims in one process: methanol conversion improvement, high hydrogen recovery, and high CO removal efficiency. In this paper, the three important aims…
Abstract Surfaces of pure Ti before and after treatment with phosphoric acid and aminopropyl trimethoxysilane (APTMS) were analysed with XPS at normal emission and in angle‐resolved mode. In addition, three different excitation energies with increasing analysis depth were used, namely, Mg Kα, Al Kα and Ag Lα. The use…
A major obstacle to the implementation of spin-polarized semiconductor devices is the current absence of suitable room-temperature, soft ferromagnetic semiconductors (FSs). Dilute magnetic semiconductors are under intense study for applications in spintronics. However, the weak solubility of randomly placed magnetic i…
Abstract The changes in fibre–matrix interface during the heat treatment of Ti6Al4V matrix reinforced with carbon‐coated SiC fibres, have been studied using XPS, AES and SEM/EDS (energy dispersion spectroscopy) techniques. The samples were characterized before and after heating at different temperatures up to 600 °C w…
We investigate a strategy for producing organic NLO materials with high chromophore densities by assembling Langmuir monolayers and Langmuir–Blodgett films containing mixtures of two hyperpolarizable chromophore amphiphiles. When deposited at an air–water interface, the amphiphilic molecules are oriented with their mo…
The electropolymerization of benzene in the air and water-stable ionic liquid 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate (HMIm)FAP is investigated. The study comprises cyclic voltammetry, IR and in situ STM/tunnelling spectroscopy measurements. The IR results indicate that poly(para)phenylene…
Mesoporous porous silicon (PSi) microcavity sensors are used to conduct conventional solid-phase peptide synthesis. The sensor optical response provides a convenient means to monitor the synthesis reaction in a nondestructive manner. Measurements indicate that peptide synthesis occurs only when the PSi sensor/scaffold…
Sift fluorene into a bowl: Manganese oxide octahedral molecular sieves (OMS-2), with the overall composition KMn8O16⋅n H2O, catalyze the mild, green, and efficient oxidation of 9H-fluorene to 9-fluorenone. The involvement of lattice oxygen species has been implicated in a free-radical chain mechanism. In terms of reac…
Effects of different plasticizer types (glycerol, propylene glycol, and sorbitol) and coating methods (brushing, dipping, and spraying) on the internal quality and shelf life of chitosan-coated eggs were evaluated during 5 wk of storage at 25 degrees C. The Haugh unit and yolk index values suggested that chitosan coat…
We report here the modification of multiwalled carbon nanotubes (MWNTs) with a kind of polysaccharide, carboxymethylated chitosan (cmCs), and their potential usage as donor-acceptor nanohybrids. The modified composites (cmCs/MWNTs) were characterized by high-resolution TEM, FT-IR, TGA and time-resolved spectroscopy. T…
Abstract A PS‐ b ‐PI diblock copolymer has been synthesized and blended with a homopolystyrene of a variable molecular weight at a variable weight ratio, resulting in different volume fractions of PS to PI and various morphologies. After being cast as a film, the double bonds in the PI microdomains were cleaved via oz…
We propose electrically tunable hybrid metamaterial consisting of special wire grid immersed into nematic liquid crystal. The plasma like permittivity of the structure can be substantially varied due to switching of the liquid crystal alignment by external voltages applied to the wires. Depending on the scale of the s…
Because of the significant interest in synthetic polymer systems with increasing degrees of complexity, we have focused attention upon the development of chemistries for the conversion of polyester backbones into functional materials. Facile conjugation strategies involving the reactions of both aminooxy and sulfonyl…
Stoichiometric Bi 2 Te 3 and its derived alloy nanotube arrays such as n-type Bi 2 Te 3− y Se y and p-type Bi 2− x Sb x Te 3 were successfully electrodeposited into the nanochannel of anodic alumina oxide (AAO) by a potentiostatic or galvanostatic method at room temperature. X-ray diffraction, scanning electron micros…
Abstract There is growing interest in the design of synthetic molecules that are able to self‐assemble into a polymeric chain with compact helical conformations, which is analogous to the folded state of natural proteins. Herein, we highlight supramolecular approach to the formation of helical architectures and their…
Abstract Blends of poly(ethylene oxide) (PEO) and novolac type phenolic resin were prepared by a solution cast method using acetonitrile as a solvent. In this work, we have investigated the PEO/phenolic blends having low phenolic content (0 to 30 wt %) with the objective in mind to design a crystallizable component fo…
Selektive Substitution: Bei der Oxidation von HCl durch Sauerstoff zu Cl2 und Wasser dient RuO2(110) als stabiler Modellkatalysator für den Sumitomo-Prozess (siehe Bild; Ru: rote und blaue Kugeln). Die Stabilisierung des RuO2-Katalysators erfolgt durch den selektiven Austausch unterkoordinierter verbrückender Sauersto…
Abstract The presence of two functional groups, nitrile and carboxyl, in carboxylated nitrile rubber allows it to be crosslinked with different agents. In this study, we examined the influence of different crosslinking agents on the properties of unfilled carboxylated nitrile rubber. Significant differences were found…