Materials Literature
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The article reports on the first preparation and self-assembly of a unique class of amphiphilic polymer brushes, which consist of hydrophobic optically active helical polyacetylene backbones and hydrophilic thermosensitive poly( N, N -dimethylamino-2-ethyl methacrylate) (PDMAEMA) side chains. The polymer brushes were…
By combining high-resolution transmission electron microscopy (HRTEM) characterization and electrical measurements on a unique device platform, we study the reversible electrically-driven phase-change characteristics of self-assembled Ge(2)Sb(2)Te(5) nanowires. Detailed HRTEM analyses are used to correlate and underst…
Abstract Poly(acrylic acid) films with a thickness of about 150 nm were deposited using a pulsed plasma onto aluminum and glass. The structure/property relationships of these samples were studied in dependence to the duty cycle (DC) of the plasma by a broad combination of different techniques and probes. For the first…
The simplest tight-binding model is used to study lattice effects on two properties of doped graphene: (i) magnetic orbital susceptibility and (ii) regular Friedel oscillations, both suppressed in the usual Dirac cone approximation. (i) An exact expression for the tight-binding magnetic susceptibility is obtained, lea…
Silicon/silicon dioxide surfaces containing 3 μm (width) × 6 μm (length) × 40 μm (height) staggered rhombus posts were prepared using photolithography and hydrophobized using a perfluoroalkyl-containing monofunctional silane. These surfaces exhibit water contact angles of θ(A)/θ(R) = 169°/156°. Water drops come to res…
A new method for creating oxygen vacancy ordered (brownmillerite) phases in epitaxial manganite thin films is demonstrated. The method involves depositing an oxygen deficient complex oxide film on top of a stoichiometric manganite film. Once the getter layer exceeds a critical thickness, a phase transition to an oxyge…
Complementary metal-oxide semiconductor (CMOS) operation is very desirable for logic circuit applications as it offers rail-to-rail swing, larger noise margin, and small static power consumption. However, it remains to be a challenging task for nanotube-based devices. Here in this paper, we report our progress on meta…
Magnetization and (57)Fe and (151)Eu Mössbauer studies of EuFe(2)(As(1 - x)P(x))(2) (x = 0-1.0) at temperatures (5-300 K) have been performed. The magnetization studies show a decrease of the divalent Eu sublattice antiferromagnetic transition temperature from T(AFM) = 20 K for x = 0 to 16 K at x≈0.2. For x > 0.2, the…
Monte Carlo simulations were used for a detailed description of magnetic, martensitic and magnetocaloric properties of Ni 2+ x Mn 1− x Ga (0.18 ⩽ x ⩽ 0.24) and Ni 50 Mn 34 In 16 Heusler alloys, which undergo a first-order magnetostructural phase transition. In the simulations we made use of magnetic exchange parameter…
The grain boundary diffusion (GBD) process is an effective process for enhancing the coercivity of Nd–Fe–B sintered magnets. When the GBD process is applied to a thick magnet, the magnet exhibits a coercivity distribution. Partial coercivity at the centre is the same as that of the original magnet, but the partial coe…
SUMMARY The effects of salinity on the growth and valve morphology of five benthic estuarine diatoms ( Nitzschia pusilla , N. frustulum , N. palea , N. filiformis var. conferta and Eolimna subminuscula ), isolated from both freshwater and brackish/marine habitats, were investigated. The four Nitzschia strains grew wel…
Abstract Nanocrystalline La 1‐ x Sr x CoO 3‐ δ (LSC) thin films with a nominal Sr‐content of x = 0.4 were deposited on Ce 0.9 Gd 0.1 O 1.95 electrolyte substrates using a low temperature sol‐gel process. The structural and chemical properties of the LSC thin films were studied after thermal treatment, which included a…
The Raman spectra of numerous dodecaborides have been measured on high-quality single crystals at ambient conditions with high spectral resolution and signal-to-noise ratio. Besides the strong Raman-active modes, numerous Raman-inactive modes occur in the spectra, indicating distortions of the structures. Ab initio ca…
Abstract This article reviews the recent developments in the synthetic strategies to chemically modify several chain‐growth polymers that were primarily developed in our laboratories, with a view to improve their flame retardance. In addition, it also incorporates the corresponding methodologies for the step‐growth th…
Abstract The progress of flame retarded polymer nanocomposites and coatings in China over the past decades are described in this review. Emphasis on flammability performance of polymer nanocomposites containing nanofillers, mainly layered inorganic compounds, nanofibers and nanoparticles, combined with conventional fl…
Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol, have been prepared by using a modified Brust's two-phase synthesis. The size, shape, and crystalline structure of the gold nanoparticles have been determined by high-resolution elect…
Abstract Versatility of plasma processing is demonstrated for the preparation of nanotextured polycarbonate surfaces with superior wettability properties. Tens of nanometers wide pillar structures are produced on the polymer by means of oxygen plasma etching, inducing on the surface a pronounced hydrophilic behavior.…
Scanning tunneling microscopy and spectroscopy in a magnetic field was used to study Landau quantization in graphene and its dependence on charge carrier density. Measurements were carried out on exfoliated graphene samples deposited on a chlorinated SiO${}_{2}$ thermal oxide, which allowed for the observation of the…
Bandgap engineering of semiconductor nanowires is important in designing nanoscale multifunctional optoelectronic devices. Here, we report a facile thermal evaporation method, and realize the spatial bandgap engineering in single CdS(1-x)Se(x) alloy nanowires. Along the length of these achieved nanowires, the composit…
Abstract Recently, it has been reported that liquid crystal (LC) defects can be used to create highly periodic templates by controlling the surface anchoring and the elastic properties of LC molecules. The self‐assembled defect ordering of the LC materials takes advantage of the ability to achieve fast stabilization o…