Materials Literature
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By combining high-resolution photoelectron spectroscopy and ab initio calculations, we show that carbon nanoislands formed during the growth of a long-range ordered graphene layer on Ir(111) assume a peculiar domelike shape. The understanding of the unusual growth mechanism of these C clusters, which represent an inte…
The hydrogen storage properties of metal nanoparticles change with particle size. For example, in a palladium-hydrogen system, the hydrogen solubility and equilibrium pressure for the formation of palladium hydride decrease with a decrease in the particle size, whereas hydrogen solubility in nanoparticles of platinum,…
The structural versatility characterizing polyoxometalate chemistry, in combination with the option to deliberately use well-defined building blocks, serves as the foundation for the generation of a large family of magnetic clusters, frequently comprising highly symmetric spin arrays. If the spin centers are coupled b…
The electronic band structure of ABC-stacked multilayer graphene is studied within an effective mass approximation. The electron and hole bands touching at zero energy support chiral quasiparticles characterized by Berry's phase $N\ensuremath{\pi}$ for $N$ layers, generalizing the low-energy band structure of monolaye…
Zn-Al and Mg-Al layered double hydroxides (LDHs) loaded with quinaldate and 2-mercaptobenzothiazolate anions were synthesized via anion-exchange reaction. The resulting compounds were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy/energy-dispersive X-ray s…
Wistar rats were nose-only exposed to multiwalled carbon nanotubes (MWCNT, Baytubes) in a subchronic 13-week inhalation study. The focus of study was on respiratory tract and systemic toxicity, including analysis of MWCNT biokinetics in the lungs and lung-associated lymph nodes (LALNs). The time course and concentrati…
The adhesion and proliferation of bacteria on abiotic surfaces pose challenges related to human infection, including subsequent formation of antibiotic-resistant biofilms in both healthcare and industrial applications. Although the design of antibacterial materials is a longstanding effort, the surface properties that…
We present a method to prepare monolayer and multilayer suspended sheets of hexagonal boron nitride (h-BN), using a combination of mechanical exfoliation and reactive ion etching. Ultrahigh-resolution transmission electron microscope imaging is employed to resolve the atoms, and intensity profiles for reconstructed ph…
We present a detailed description of the nature of the wavefunction and spin distribution of the zero energy modes of zigzag graphene ribbons (ZGRs) in the presence of the intrinsic spin_orbit (I-SO) interaction. These states characterize the quantum spin Hall (QSH) phase in graphene ribbons. We provide analytic expre…
We present an extended study of finite-width zigzag graphene ribbons (ZGRs) based on a tight-binding model with hard-wall boundary conditions. We provide an exact analytic solution that clarifies the origin of the predicted width dependence on the conductance through junctions of ribbons with different widths. An anal…
We explore a novel transport phenomenon by studying the effect of surface disorder on electron transport through a finite size conductor with side coupled metallic electrodes. In the strong disorder regime the current amplitude increases with the increase of the surface disorder strength, while, the amplitude decrease…
Effects of a novel nucleating agent bicyclic [2,2,1] heptane di-carboxylate (HPN-68) on the properties, crystallization, and melting behavior of isotactic polypropylene (iPP) were studied. The results showed that HPN-68 is a typical nucleating agent for α-iPP and it has high nucleation efficiency. Addition of a small…
Optical absorption spectra of KBr:Tl + (0.0125 mol%) single crystals shows A, B and C bands around 258, 220 and 210 nm respectively. In KCl 0.1 Br 0.9 :Tl + (0.0125 mol%) mixed crystals exhibit slightly broadening of the A‐band towards lower wavelength side. The broadening of the absorption spectra are suggested to be…
An edge-to-edge matching model has been used to analyze the crystallographic features between Mg matrix and three commonly accepted heterogeneous nucleants for Mg grains, AlC, AlCO and Al(Mn, Fe). The model has predicted that AlCO is the most effective nucleant of the three compounds assessed for Mg grains and that Al…
The influence of Al content on the Mg-Al alloys corrosion performance during sodium chloride induced atmospheric corrosion has been studied. It was found that the corrosion rate of three Mg-Al alloys was accelerated with increasing N content. The poor corrosion resistance was attributed to the galvanic coupling betwee…
Boehmite nanorods were synthesized by a solvothermal method using AlCl_3·6H_2O in mixed solvents of water and aniline.The solvothermal time,heating temperature and the concentration of aniline have effects on the morphology of boehmite.γ-alumina nanorods were prepared by a simple thermal transformation of boehmite nan…
One-dimensional CdS nanocrystals have been prepared by solvothermal method using cadmium acetate as a cadmium precursor, elemental sulfur and Na2S, as a sulfur precursor, and ethylenediamine as a solvent at 150◦C for 5 h. The nanocrystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM…
The synthesis of ultrafine cerium dioxide precursor via homogeneous precipitation was studied. Mixed aqueous solution of anhydrous cerium nitrate and urea was first heated to 85℃ for 2 h, and the prepared suspension was then aged at room temperature for various periods of time. White precipitate was finally collected…
A pure conducting polymer (PANI-CSA) film conditioned by an electric discharge was tentatively utilized as an cathode for emitting electrons under electric fields. The emission of electrons was observed using a phosphor (ZnO:Zn) screen excited by electrons from the conditioned film. The film morphology was investigate…
Thermoelectric materials, Mg2Si1ixGex (x=0, 0.2, 0.4, 0.6, 0.8, 1), have been prepared by bulk mechanical alloying (BMA) and hot pressing (HP). The electrical conductivity, Seebeck coecient and thermal conductivity were measured from room temperature up to about 700 K. The electrical conductivity of all the samples in…