Materials Literature
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The Raman and infrared spectra of dimethylformamide (DMF)/polyacrylonitrile (PAN) /lithium perchlorate have been measured and analyzed. It is found that the interaction between DMF and PAN is not strong, probably resulting from the dipole interaction between the O=C‒N group of DMF and the nitrile group of PAN. Compare…
We report the superlattice of the modulated structure DySe 1.84 . The modulation is of the charge density wave type, associated with electronic states on selenium atoms arranged in two-dimensional square nets. The complete modulated structure can be described in the superspace group formalism in a 3+2 dimensional spac…
Difficulties have previously been noted in the use of the D and H fields in the Maxwell boundary conditions when these are applied to theories of reflection effects involving chiral media. Such difficulties may be avoided by adopting covariant forms of D and H. These are derived in the electric quadrupole–magne…
A study was carried out to investigate the effect of various hydrodynamic parameters on the corrosion rate of low carbon steel in CO environments in the presence of inhibitors. Two different flow geometries, rotating cylinder and pipe flow, were studied simultaneously in the same electrolyte within a glass loop. Compa…
The development of two low cost, corrosion resistant Fe-Mn-Si based shape memory alloy systems: Fe-Mn-Si-Al-Cu and Fe-Mn-Si-Cr-Cu is discussed. The new alloys exhibited a shape memory capacity which is clearly superior to traditional Fe-Mn-Si ternary alloys. Corrosion test results indicated that the new alloys have go…
Nanometre voids and holes have been produced in aluminium films up to 220nm thick by the stationary focused 100 keV high-current-density electron probe in a dedicated scanning transmission electron microscope. The electron energy is below the threshold for bulk displacements in aluminium but is sufficient to cause spu…
A surface-enhanced Raman scattering (SERS)-active Ag particle-doped cellulose gel film was prepared reproducibly by the counter diffusion method. In the literature, SER spectra of 2,2′-bipyridine and phthalimide were similar to those adsorbed on Ag sol. This doped film permits the SERS of a vital functional substance…
Partially amorphous Nd-Fe-B ribbons containing 20 or 50 wt% Fe in excess of the nominal composition Nd/sub 2/Fe/sub 14/B with 2.9 wt% Cu and 9.7 wt% Zr (referred to Nd/sub 2/Fe/sub 14/B) were prepared by melt-spinning. After a heat treatment the material consists of a mixture of three parts: hard magnetic grains of th…
Ultraviolet-visible absorption spectra and fluorescence spectra of PI(6FDA/DCHM) and PI(6FDA/PDA) were investigated, as well as their thermal properties. Both PI(6FDA/DCHM) and PI(6FDA/PDA) showed high transparency in the visible region. Inter- and intra-molecular charge transfer were weakened by introducing fluorinat…
The effect of a phosphate treatment as a corrosion inhibitor for a RE-iron-boron magnet has been investigated. The corrosion characteristics of the magnet in a phosphate solution, which consisted of 0.15 M NaH/sub 2/PO/sub 4/, were analyzed by electrochemical impedance and electrochemical noise measurements. The immer…
Different self-consistent field (SCF) iteration schemes for open-shell systems are discussed. After a brief summary of the well-known level shifting and damping procedure, we describe the quadratically convergent SCF (QCSCF) approach based on the gradient and the Hessian matrix in a space of orbital rotation parameter…
Abstract The Sillenite type Bi 24 B 2 O 39 is an incongruently melting compound at T p = 650 ° C . Single crystals have been grown from non‐stoichiometric melts as well as from high temperature solutions by the Czochralski method and by a top seeded solution growth technique (TSSG), respectively. The main difficulty i…
The ruthenium(II) complex salts [Ru(NH 3 ) 5 L][PF 6 ] 2 [L = coumarin 510 (C-510) 1 or coumarin 523 (C-523) 2] have been synthesized and fully characterized. Their Ru III analogues [Ru(NH 3 ) 5 L][PF 6 ] 3 (L = C-510 3 or C-523 4) have been prepared by oxidation of 1 or 2, respectively, with AgO 2 CCF 3 . Electronic…
A simple modification of surface spreading that enables easy examination of subcellular structures by both transmission electron microscopy (TEM) and atomic force microscopy (AFM) was developed in the present study. Specimens were adsorbed onto carbon-coated electron microscopy (EM) grids with parlodion backing for co…
By means of electrochemical and quantitative histomorphometric methods, the corrosion resistance and tissue biocompatibility of Ti50Ni50 and Ti50Ni50-xCux (x = 1, 2, 4, 6, 8) were investigated. It is discovered that the repassivation potential of Ti50Ni50-xCux (x = 2, 4, 6, 8) alloys is about 200 mV higher than that o…
Abstract Alloys intended for use in high-temperature environments rely on the formation of a continuous, compact, slow-growing oxide layer for oxidation, and hot corrosion resistance. This article focuses on the issues related to high-temperature oxidation of superalloys used in gas turbine engine applications. It dis…
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Organic-inorganic hybrid materials synthesized via sol-gel processing are excellent solid matrices for photochromic dyes like spirooxazine, and the photochromic performance can be further enhanced by introducing suitable additives. This work describes the effects of additives on the photochromic intensity (Δ…
The main dielectric contributions and the structure of dielectric spectrum of the ferroelectrics with diffused phase transitions are considered on the base of PbMg1/3Nb2/3O3 (PMN) crystals investigation. Dielectric spectra of the displacive, order-disorder and diffused phase transitions ferroelectrics are compared. Di…
The unique character of the triffimide anion has been revealed in a study of how the doping anion affects the properties of conducting polymer thin films using poly(3‐methylthiophene) doped with triflimide ((CF 3 SO 2 ) 2 N ⊖ ), perchlorate (CIO ⊖ ). Variations in film morphology, conductivity, and the time dependence…