Materials Literature
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In order to introduce a monomer into a PVC matrix, the swelling behavior of PVC films was tested in four solvents (acetone, methyl ethyl ketone, benzene, and toluene) and in acrylic acid solutions in acetone (10, 25 and 50 wt.-%) containing 0.1 wt.-% azoisobutyronitrile. The type of transport, diffusion and permeation…
The formation and decay of cyclic oligomers during hydrolytic polymerization, cationic polymerization, and autocatalytic polymerization of 6-hyxanelactam carried out at 260°C was followed by means of the high performance liquid chromatography (HPLC) analysis of portions extracted with methanol from the polymerization…
The purity is one of the key issues in the development of low-activation ferritic steels for fusion applications to reduce the concentration of highly radioactive elements. In this work a high-purity Fe–9Cr alloy and impurity-doped alloys were prepared from an ultra-high-purity iron and high-purity elements using an a…
Magnetization reversal process in Fe 15 Co 20 Ni 65 /Cr or Cu/Fe 15 Co 20 Ni 65 sandwiches having magnetic layers with mutually perpendicular easy magnetization axes or different value of coercive force has been studied. Dependences of hysteresis properties on interlayer thickness (L int ) for the sandwiches were meas…
The parameter Δλ/ΔM is a useful tool for investigating the magnetization process in magnetostrictive materials. This work extends the use of this parameter from that previously explored in the 〈100〉 and 〈111〉 easy regimes to the 〈110〉 easy regime. Theoretical values of Δλ/ΔM are presented for all possible domain wall…
The problem of finding an approximate theoretical description of the electrically induced Fréedericksz transition in droplets of a nematic liquid crystal (NLC) with a bipolar structure is solved for the case of a finite azimuthal energy of surface anchoring due to the interaction of the surface layer of the NLC with t…
Extended x-ray absorption fine structure measurements of the Fe K, and Pr and Er LIII absorption edges, were carried out to elucidate the relationship between the local structure and magnetism in Al substituted, partially nitrogenated (Er0.5Pr0.5)2Fe17 permanent magnets. We find that the nitrogenation acts to dilate b…
Microporous silica was prepared by selective leaching of the Al 2 O 3 component from calcined kaolinite. The kaolinite was calcined at various temperatures from 400 to 1000°C for 24 h. It was then chemically treated with a 20 mass% H 2 SO 4 solution at 90°C for 2h and the effect of the calcining temperature was studie…
Abstract Crystalline magnesia (periclase) is traditionally considered an undesirable compound in cements since it hydrates slowly at normal temperatures and, hence, causes a delayed expansion. This delayed expansion may be more harmful to the concrete structure than the “early” expansion due to free lime hydration in…
Unusual piezoresponse signals have been observed in glycine aminoacid powder at a frequency near 10 MHz, which exhibited a regular pattern in time determined by a periodic phase variation in the elastic vibrations of individual powder particles. This phenomenon results from the formation of spatial structures in glyci…
This review deals with our recent development of Fe-based bulk amorphous alloys with soft magnetic properties. Multicomponent Fe-(Al,Ga )-(P,C,B,Si) and Fe-(Co,Ni)-(Zr,Nb,Ta)-B alloys are amorphized in the bulk form with diameters up to 2 and 6 mm, respectively, by copper mold casting and the largest temperature inter…
High electric fields are known to irreversibly reduce the out-of-plane tilt of the chevron layers in ferroelectric liquid crystal (FLC) devices. This paper reports a dynamic x-ray study of field driven structural layer changes in a ∼4μm thick FLC device containing the liquid crystal SCE13. The applied voltage and dura…
Combined therapy with heat-sensitive liposomes as carriers for drugs and local hyperthermia is thought to improve the local control rate. I studied the antitumor effects and concentrations of CDDP encapsulated in heat-sensitive liposomes (LIP-CDDP) in vivo. LIP-CDDP or CDDP-solution was given to 8 week-old male C3H/He…
This paper concerns morphological stability of a similarity solution to the Stefan problem with surface tension and initial supercooling. The linear stability analysis shows that for a nonzero surface tension each perturbation mode with a nonzero wave number is stable. However, the solution is unstable with respect to…
We describe the preparation and some optical properties of high refractive index TeO2-PbO-TiO2 glass system. Highly homogeneous glasses were obtained by agitating the mixture during the melting process in an alumina crucible. The characterization was done by X-ray diffraction, Raman scattering, light absorption and li…
The magnetocrystalline anisotropy energy (MAE) of (Fe1−xCox)3P (x=0, 0.1, 0.2, 0.33) has been studied in the temperature range 5 K–300 K. The compound crystallizes in a tetragonal structure with three non-equivalent metal sites and shows an easy planar behavior with the magnetic moments aligned in the ab plane and the…
Twenty seven samples of carboxylato- and sulfonato-telechelic polyisoprenes associated with various cations (Na, K, Rb, Cs, Mg, Ca, Sr, and Ba) have been investigated by small-angle X-ray scattering. The Bragg spacing characteristic of the ionic peak is directly proportional to the root-mean-square end-to-end distance…
An experimental investigation has been carried out to determine the extent to which axial divergence in a conventional powder diffractometer influences the measurement of peak profile parameters. A Siemens D5000 θ–2θ diffractometer was used for this study along with the LaB 6 line profile standard SRM 660. Eight uniqu…
Abstract— Polymer‐stabilized cholesteric‐texture light shutters are made of cholesteric liquid crystal and polymer‐network dispersions. In the polymer‐stabilized cholesteric‐texture reverse‐mode light shutter, the dispersed polymer network stabilizes the transparent planar texture of the liquid crystal at zero field.…
Carbon nanotubes have a whisker-like structure so an extremely high strength and lack of plasticity are generally predicted. In-situ observations made by transmission electron microscopy, however, prove that carbon nanotubes bend plastically at room temperature. The bending process at the atomic level is suggested by…