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。
We are able to grow high quality La0.67Sr0.33MnO3(LSMO) colossal magnetoresistive (CMR) thin films on Y-stabilized zirconia (YSZ) buffered (100) Si substrates using a Bi4Ti3O12 texturing and lattice matching layer. The CMR films have very high structural perfection and show excellent transport and ferromagnetic proper…
The feasibility of using copper nitride and tin nitride thin films as write-once optical recording media was explored. The Cu3N and SnNx films were obtained by the reactive sputtering method. They were thermally decomposed into Cu and Sn films at 470 and 550 °C, respectively. The Cu film obtained by the thermal decomp…
We have proposed ReMnO3 (Re:rare earth) thin films as a new candidate for nonvolatile memory devices. In this letter, we report on fabrication of (0001) YMnO3 films on (111)MgO, (0001)ZnO:Al/(0001) sapphire, and (111)Pt/(111)MgO using rf magnetron sputtering. We succeeded in obtaining (0001) epitaxial YMnO3 films on (…
We present atomically resolved scanning tunneling microscopy (STM) images from Ti${\mathrm{O}}_{2}$(110) surfaces. After annealing nearly perfect stoichiometric $1\ifmmode\times\else\texttimes\fi{}1$ surfaces to elevated temperatures in ultrahigh vacuum, randomly distributed oxygen vacancies are observed. The apparent…
A model tetravalent network fluid, crystal and many glasses are studied by molecular dynamics simulation. 171 glasses were made by compressing the fluid with five orders of magnitude variation in the quench rate. The pressure and entropy of each glass are expressed as functions of a single variable, the quench rate de…
Reversible photoinduced anisotropy in a series of liquid-crystalline azobenzene side-chain polyesters is investigated as a function of intensity of the write beam and the sample temperature. Measurements reveal that the erasing takes place at a temperature much higher than the glass transition temperature. Induced ani…
Switchable, continuous, complex-amplitude modulation is demonstrated with two cascaded, twisted nematic liquid-crystal televisions (LCTV's), both operating in phase- and amplitude-coupled modulation modes. The condition for full-range complex modulation is that one of the LCTV's must provide a 2π-range phase modulatio…
The recently discovered mesoporous aluminosilicate MCM-41 consists of hexagonal arrays of nanometer-sized cylindrical pores. It is shown that this material can be synthesized by cooperative condensation of silicate and cylindrical cationic micelles. Careful control of the surfactant-water content and the rate of conde…
Ordered mesostructured porous silicas that are also macroscopically structured were created by control of the interface on two different length scales simultaneously. Micellar arrays controlled the nanometer-scale assembly, and at the static boundary between an aqueous phase and an organic phase, control was achieved…
LDPE-polystyrene (PS) blends were compatibilized using three PS-hydrogenated polybutadiene-PS and one PS-hydrogenated polybutadiene block copolymers. The blends were prepared by corotating twin-screw extrusion, then were injection-molded. During processing, the morphology evolution of the blends was studied using SEM…
This paper concerns the effects of processing parameters on the in situ compatibilization of polypropylene (PP) and poly(butylene terephthalate) (PBT) blends by one-step reactive extrusion in a corotating intermeshing twin screw extruder. This in situ compatibilization process was characterized by a sequential arrange…
The vibrational infrared and Raman spectra of a series of t-butyl substituted oligomers of para-phenylenevinylene and of the corresponding polymer in the pristine and potassium-doped states have been recorded for the first time and interpreted on the basis of the theory of the effective conjugation coordinate. The Ram…
Recent advances in Nd-doped phosphate laser glasses for high-peak-power and high-average-power applications are reviewed. Compositional studies have progressed to the point that glasses can be tailored to have specific properties for specific applications. Non-radiative relaxation effects can be accurately modeled and…
The morphologies of several styrene–isoprene miktoarm star copolymers have been examined by small angle x-ray scattering and electron microscopy. Three of these polymers were of the three-armed A2B type, and six were four-armed A3B miktoarms. The ordered microphase-separated morphologies displayed by these polymers we…
We present new methods for identifying and analyzing statistically significant residue clusters that occur in three-dimensional (3D) protein structures. Residue clusters of different kinds occur in many contexts. They often feature the active site (e.g., in substrate binding), the interface between polypeptide units o…
Statistically significant charge clusters (basic, acidic, or of mixed charge) in tertiary protein structures are identified by new methods from a large representative collection of protein structures. About 10% of protein structures show at least one charge cluster, mostly of mixed type involving about equally anionic…
A general method is described for constructing a helical oligoproline assembly having a spatially ordered array of functional sites protruding from a proline-II helix. Three different redox-active carboxylic acids were coupled to the side chain of cis-4-amino-L-proline. These redox modules were incorporated through so…
We have investigated an antiferroelectric liquid crystal which is stabilized by a polymer network. The latter is formed by in situ photopolymerization of a mesogenic diacrylate. The pure liquid crystalline monomer shows the well-known tristable electro-optic switching due to a field induced transition from the antifer…
Colossal magnetoresistance in ( x = 0.0, 0.1) , P D Battle, S J Blundell, M A Green, W Hayes, M Honold, A K Klehe, N S Laskey, J E Millburn, L Murphy, M J Rosseinsky, N A Samarin, J Singleton, N E Sluchanko, S P Sullivan, J F Vente
Phase-matched second-harmonic generation in the highly χ(2)-active layered semiconductor GaSe is demonstrated in the near-infrared frequency region. Due to the high indices of refraction, the internal phase-matching angle of about 30° is beyond the critical angle of total reflection for a z-cut crystal. This problem i…