Materials Literature
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The binary blends of poly(ethylene terephthalate) (PET) and poly(ether imide) (PEI) were miscible in the melt but showed simultaneous crystallization and liquid−liquid demixing below the melting point. In this study, the morphological structure induced by the coupling of crystallization and liquid−liquid phase separat…
Catalytic activities of K 2 CO 3 supported on several oxides and carbon itself were studied for the combustion of carbon at 673−773 K. K 2 CO 3 supported on a perovskite oxide, La 0.8 Sr 0.2 Cr 0.5 Mn 0.45 Pt 0.05 O 3 (LSCMP), exhibited higher activity than that supported on the other supports including carbon itself…
The magnesium complex (1) of the tetranucleating macrocyclic ligand H4L1 on transmetalation with copper(II) perchlorate in the presence of triethylamine produces the dicopper(II) complex (3) of the dinucleating macrocyclic ligand H2L3, while the same reaction when carried out in absence of triethylamine affords the me…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFirst Facile Synthesis of Biomimetic Poly-(R)-3-hydroxybutyrate via Regioselective Anionic Polymerization of (S)-β-ButyrolactoneZbigniew Jedliński, Piotr Kurcok, and Robert W. LenzView Author Information Centre of Polymer Chemistry,…
Bonding amorphous polystyrene (PS) and poly(2,6-dimethyl 1,4-phenylene oxide) (PPO) has been carried out in a broad range of temperatures and contact times ( t ), but always below the glass transition temperature ( T g ), in a lap−shear joint geometry. Strength at the symmetric and asymmetric polymer/polymer interface…
The morphologies of a polystyrene- block -polybutadiene- block -poly(methyl methacrylate) triblock copolymer (SBM) with polybutadiene as the majority component as they are cast from different solvents and solvent mixtures are determined using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAX…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTwo-Step Percolation in Polymer Blends Filled with Carbon BlackMing Qiu Zhang, Gang Yu, Han Min Zeng, Hai Bo Zhang, and Yan Hui HouView Author Information Materials Science Institute, Zhongshan University, Guangzhou 510275, P. R. Ch…
We point out that the existing experimental data of most manganese oxides show the {\sl frustrated} p-wave superconducting condensation in the ferromagnetic phase in the sense that the superconducting coherence is not long enough to cover the whole system. The superconducting state is similar to the $A_{1}$ state in s…
A novel, general Green's function technique for elastic spin-dependent transport calculations is presented, which (i) scales linearly with system size and (ii) allows straightforward application to general tight-binding Hamiltonians (spd in the present work). The method is applied to studies of conductance and giant m…
The work is devoted to investigation of the collective behavior of the regular rectangular lattices of the NiFe nanoparticles caused by the dipole-dipole interaction between them. The samples was prepared by the method of the electron lithography and consist of about 100000 particles of approximately 50 nm size. The m…
A nucleation method to form diamond on chemically pretreated silicon (111) surfaces is reported. The nucleation consisted of binding covalently 2,2-divinyladamantane molecules on the silicon substrate. Subsequently, low pressure diamond growth was performed via microwave plasma chemical vapor deposition in a tubular d…
We report zero-field muon spin rotation data in single crystals of ${\mathrm{La}}_{1.4}{\mathrm{Sr}}_{1.6}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ for $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}5--325\mathrm{K}$. The spin-lattice relaxation rate is spatially inhomogeneous below the 3D magnetic transition temperatu…
The effects of monovalent alkali metal substitution into the lanthanide sites in oxides are presented. We report structural features, magnetic and electrical properties of these materials for . The lattice symmetry of the samples is found to be rhombohedral. All the phases are ferromagnetic, with Curie temperatures st…
The near-edge x-ray absorption fine structures (NEXAFS) of hydrogenated diamond films and single-crystal diamond surfaces have been studied by recording the partial electron yield and the H+ and H− ion desorption yields as a function of photon energies around the C(1s) core level. It has been found that ion desorption…
Sb nanocrystals were formed in thin, thermally grown SiO2 layers using low-energy ion implantation followed by thermal annealing. These Sb nanocrystals have good size and position uniformity. Both the narrow as-implanted profile and the compressive strain that exists near the SiO2/Si interface supposedly contribute to…
The magnetoresistance of mechanically induced grain boundaries in La0.7Ca0.3MnO3 thin films is investigated. The grain boundaries are fabricated by a mechanical deformation of the LaAlO3 substrate prior to film deposition. During film deposition, the deformed substrate region induces some growth disorder in the film l…
High-quality (001) thin film La0.5Sr0.5CoO3−x (LSCO) has been prepared on (001) SrTiO3 substrates by pulsed laser deposition under different oxygen pressures with and without postannealing. C-axis expansion of the LSCO with reducing oxygen pressure was revealed. The electrical resistivity increased over five orders of…
A novel principle for cooling by adiabatic pressure application in the mixed crystalline compound Pr1−xLaxNiO3 is described and experimentally verified. Cooling occurs in the vicinity of the structural phase transition where the electronic ground state of the Pr3+ ions changes from a singlet to a doublet state. By pro…
Porous silicon (PS) with nondegrading photoluminescence (PL) was prepared by a novel method. For fresh samples, the PL peak intensity is 2--2.5 times stronger than that in normal PS. Upon exposing PS to ambient air, the PL intensity increases during the first four months and then saturates. No PL degradation is observ…
single crystals were grown by the laser floating zone method. Polarized Raman spectra were measured and interpreted consistently with the Pcmn crystal space group. Up to 16 Raman modes were identified and their symmetry assigned. The infrared optical constants of were determined from the analysis of the reflectance sp…