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 macromolecular helicity induction of a novel optically inactive poly(phenyl isocyanate) bearing crown ether as a host group ( 2 ) based on host−guest complexation was discussed. 4‘-Isocyanatobenzo-18-crown-6 ( 1 ) was polymerized with MeLi in THF at −78 °C to afford 2 with 71% yield. The circular dichroism (CD) sp…
We report the femtosecond transient absorption dynamics of the gold and gold−polypyrrole nanoparticles by photoexcitation at various wavelengths. The bleach recovery dynamics of the surface plasmon band for the gold and gold−polypyrrole nanoparticles exhibit different responses to the pump beam energy and intensity in…
While the optical properties of the superconducting salt $\ensuremath{\alpha}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}\mathrm{\text{\ensuremath{-}}}\mathrm{N}{\mathrm{H}}_{\mathrm{4}}\mathrm{H}\mathrm{g}(\mathrm{S}\mathrm{…
Abstract Square sheets of extrusion grade polystyrene (PS) were biaxially stretched using a laboratory biaxial stretcher. The effects of process parameters such as stretch ratio, drawing sequence, drawing speed, and temperature were studied. Birefringence, mechanical properties, and thermal shrinkage of the stretched…
We have demonstrated the feasibility of sensing adsorption of untagged molecular analytes in an electrochemically fabricated porous aluminum oxide template with regular nanometer dimension pores by monitoring reflectivity spectra. Combining this with chemistry to functionalize Al 2 O 3 with DNA oligonucleotides, we ar…
The synthesis and characterization of a polycarbonate of glycerol and poly(carbonate−ester)s of glycerol and l -lactic acid are reported. These new polymers possess a hydrolyzable backbone, tunable hydrophobic/hydrophilic properties, and functionalizable pendant groups. The free hydroxyl groups on the poly(glycerol- c…
An experimental study of the early stages of crystallization in iPP has shown a qualitative difference between the behavior at low supercooling with that observed with a deep quench. To address previous misgivings in the limits of resolution of crystallites by wide-angle scattering, a new detector has been used that h…
We report the observation of the resonant transport in multiwall carbon nanotubes in a crossed geometry. The resonant transport is manifested by an asymmetric peak in the differential conductance curve. The observed asymmetric conductance peak is well explained by the Fano resonance originating from the scattering at…
A new AB 2 monomer, designed from a template of the repeating unit of the hyperbranched polyimides by nonideal A 2 + B 3 polymerization, was successfully prepared via a multistep synthesis. Hyperbranched polyimides, having the same repeating unit as that by nonideal A 2 + B 3 polymerization, were prepared from this ne…
We present a detailed study of the magnetic properties of (Ga,Mn)N layers grown directly on 4H-SiC substrates by reactive molecular-beam epitaxy. X-ray diffraction and transmission electron microscopy demonstrates that homogeneous (Ga,Mn)N alloys of high crystal quality can be synthesized by this growth method up to a…
Mixtures of polystyrene- block -poly(methyl methacrylate) (PS−PMMA) having PMMA cylindrical microdomains with homopolymers of PMMA and poly(ethylene oxide) (PEO) were used to study the effect of the interaction between homopolymers confined to the cylindrical microdomains and the PS matrix on the microdomain spacing o…
Silver nanoparticles have been produced by γ-irradiation of silver solution in optically transparent inorganic mesoporous silica. The reduction of Ag + within the matrix is brought about by hydrated electrons and hydroalkyl radicals generated during the radiolysis of the 2-propanol solution. The particles formed withi…
The structure and properties of the {001} planar platelet in diamond are investigated using ab initio theory. We find that a carbonaceous model, based on a layer of self-interstitials, satisfies the requirements of transmission electron microscopy, infrared absorption data, and energetic considerations. The energetics…
We demonstrate movement of a head-to-head domain wall through a magnetic nanowire simply by passing an electrical current through the domain wall and without any external magnetic field applied. The effect depends on the sense and magnitude of the electrical current and allows direct propagation of domain walls throug…
We examine the effect of alloying Sn on the Sb site of ytterbium-filled skutterudites, a promising class of thermoelectric materials. We report measurements of the Hall effect, electrical resistivity, Seebeck coefficient, and thermal conductivity between 2 and 300 K on two series of samples having different ytterbium…
Single crystals of strontium borophosphate, SrBPO 5, have been grown with sizes up to 25 × 15 × 10 mm 3 from the BPO 4 flux by the top-seeded solution growth method. The compound crystallizes in the trigonal system, space group P 3 2 21 (No. 154), with a = 6.8850(10) Å, c = 6.8700(14) Å, and three formula units per ce…
In the present investigation, the novel two-step electrochemical process of room temperature synthesis of Hg-1212 superconducting films has been developed and reported first time. Electrochemical parameters were optimized by studying cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA) fo…
The lattice gas model for adsorption of alkaline elements on W(112) surface is studied by Monte Carlo simulations. The model includes dipole--dipole interaction as well as long-range indirect interaction. The numerical results show that truncation of the indirect interaction even at 200$Å$ may change a phase diagram,…
Poly(vinylidene difluoride) (PVDF) nanotubes were prepared by wetting of ordered porous templates. We processed either PVDF melts or solutions. The properties of the nanotubes depend strongly on the preparation method. Solution-wetting provides nanotube walls with poor crystallinity. In contrast, nanotube walls obtain…
The photoluminescence (PL) of high-quality CdSe nanocrystals (NCs) incorporated into polymer thin films was found to respond reversibly and rapidly to environmental changes upon photoradiation above their absorption onset. The PL of the NCs may be dramatically enhanced or diminished depending on the properties of the…