Materials Literature
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The boride compounds MB_x related to the magnesium-boron stacking layered material MgB2 are discussed in terms of the B-B layers in the borides analogous to the Cu-O ones in the cuprates. We propose a possibility of superconducting materials which exhibit higher critical temperature T_c than 39 K of MgB2. We point out…
A Schwinger boson mean field theory is developed for spin liquids in a symmetric spin-orbital model in higher dimensions. Spin, orbital and coupled spin-orbital operators are treated equally. We evaluate the dynamic correlation functions and collective excitations spectra. As the collective excitations have a finite e…
The sputtering yield, Y, from a cylindrical thermal spike is calculated using a two dimensional fluid dynamics model which includes the transport of energy, momentum and mass. The results show that the high pressure built-up within the spike causes the hot core to perform a rapid expansion both laterally and upwards.…
Self-organization on crystal surface is studied as a two dimensional spinodal decomposition in presence of a surface stress. The elastic Green function is calculated for a $(001)$ cubic crystal surface taking into account the crystal anisotropy. Numerical calculations show that the phase separation is driven by the in…
The density and the elastic stiffness coefficients of fcc solid argon at high pressures from 1 GPa up to 80 GPa are computed by first-principles pseudopotential method with plane-wave basis set and the generalized gradient approximation (GGA). The result is in good agreement with the experimental result recently obtai…
We study the transverse cracking of the 90 degree ply in [0/90] cross-ply laminates by means of a discrete element method. To model the 90 degree ply a two-dimensional triangular lattice of springs is constructed where nodes of the lattice model fibers, and springs with random breaking thresholds represent the disorde…
The morphology of multilayer films formed from polydiallyldimethylammonium chloride and polystyrene sulfonic acid deposited under a range of salt concentrations (from 10 - 4 to 1.0 M) was investigated using atomic force microscopy (AFM). Ten-bilayer films that were deposited with less than 0.3 M added NaCl were flat a…
Extended x-ray absorption fine-structure measurements have been performed on ZnSe crystals doped with Er by an addition of ErF 3 during growth. The results show that Er exists in these samples in an orthorhombic configuration with nine nearest F neighbours similar to that in orthorhombic ErF 3 . The energy level split…
SCOPUS: le.j
A technique to improve thin-film yield in chemical bath deposition of semiconductor thin films is presented. This involves the use of very small substrate separation, 0.1 mm, to eliminate the passive layer of the bath, which contributes solely to precipitation. At small substrate separation, a thin layer of the bath m…
In this work, gadolinium oxide (Gd2O3) films were obtained by the vacuum evaporation method. Films were tested by x-ray diffraction and energy dispersive x-ray fluorescence analysis. The attenuation of x-rays through the sample, and the absorption-corrected x-ray fluorescence yield, was utilized for quantitative analy…
We present the first results relative to the diffusion process of proteins (human serum albumin) adsorbed on or embedded in poly(sodium 4-styrenesulfonate)/poly(allylamine hydrochloride) polyelectrolyte multilayer films by using fluorescence recovery after photobleaching. At least two populations of adsorbed proteins…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStructural and Thermosensitive Properties of Cyclotriphosphazenes with Poly(ethylene glycol) and Amino Acid Esters as Side GroupsSang Beom Lee, Soo-Chang Song, Jung-Il Jin, and Youn Soo SohnView Author Information Inorganic Chemistry Laboratory, Korea Institute of Science and T…
N -Methylated pyridospiropyran cations SP-R + (R= Me, Ph) have been inserted into MnPS 3 by ion exchange to yield Mn 1 - x PS 3 (SP-R) 2 x intercalates. Thin transparent films of these materials have been processed, which exhibit photochromism due to spiropyran−merocyanin transformation. Intercalation considerably sta…
Abstract 4‐ tert ‐Butylstyrene‐EPDM‐divinylbenzene graft polymer (PBED) was prepared by graft crosslinking polymerization in toluene using BPO as an initiator. Gel and sol of PBED were isolated by extraction with tetrahydrofuran (THF). Sol PBED can be reused as oil absorbent through cross‐linking by ultraviolet irradi…
We synthesized analogous series of monodisperse ABC triblock copolymers with symmetrical end blocks A/C and different short middle blocks B (5−10 wt %) with varying polarities by sequential anionic polymerization, i.e., polystyrene- b- poly(2-vinylpyridine)- b -poly(methyl methacrylate) (PS- b -P2VP- b -PMMA) and poly…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAromatic Polyethers with Low Polydispersities from Chain-Growth PolycondensationTsutomu Yokozawa, Yukimitsu Suzuki, and Shuichi HiraokaView Author Information Department of Applied Chemistry, Kanagawa University Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan Cite…
The synthesis of poly(trifluoropropylmethyl)siloxane (PTFPMS) by anionic ring-opening polymerization of 1,3,5-tris(trifluoropropylmethyl)cyclotrisiloxane (F 3 ) was studied in miniemulsion using didodecyldimethylammonium bromide (DDDBr) as emulsifier and sodium hydroxide as initiator. This new process of polymerizatio…
Spontaneously forming H- and J-type chiral self-assemblies of lutein and lutein diacetate were studied by means of ultraviolet−visible and circular dichroism spectroscopy (CD). Spectroscopic properties of their thin films has been determined for the first time. Existence of chiral superstructures in both solution and…
Semiconductor SnO 2 nanowire arrays were fabricated by electrochemical deposition and thermal oxidizing methods based on highly ordered nanoporous alumina membrane. Their microstructures were characterized by X-ray diffraction, transmission electron microscopy, Raman spectrum, and scanning electron microscopy. The res…