Materials Literature
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Boundaries of the existence of insoluble polyelectrolyte complexes in solutions of nonequimolar mixtures of quaternary polyamines and polycarboxylates of various degrees of polymerization have been determined with turbidimetric titration. It has been shown that in salt-free media the position of critical points expres…
SiC‐based electroconductive composites containing 10 and 30 vol% MoSi 2 particles were hot pressed at 1900°C. The MoSi 2 particles, besides increasing the electrical conductivity of the silicon carbide matrix, acted as reinforcement for the material. For the composition containing 30 vol% of MoSi 2 (see figure), the r…
The effect of electron irradiation on the properties of the systems 1% Pd/C, 1% Pd/Al 2 O 3 , and 1% Pd/TiO 2 is studied in gas-phase and liquid-phase toluene hydrogenation. An increase in the irradiation dose to 120–900 Mrad increases the catalytic activity by a factor of 2–8 relative to that of the original system.…
Imaging of high-speed incandescent dust particle trajectories in a tokamak plasma has been accomplished on NSTX using up to three high-speed cameras each viewing the same plasma volume from different locations and operating at speeds up to 68000frames∕s with exposure times varying from 2to300μs. The dynamics of the du…
We prove the periodicity of all H2-local minimizers with low energy for a one-dimensional higher order variational problem. The results extend and complement an earlier work of Stefan Müller which concerns the structure of global minimizer. The energy functional studied in this work is motivated by the investigation o…
A novel method is described for the measurement of long pitch lengths in chiral nematic liquid crystals using the bowing of reverse twist disclination lines in 90° twisted nematic devices. The method has been used to measure pitch lengths of up to 50 mm, significantly longer than previously possible using existing met…
Surface-wave plasma has been used to modify polymer surfaces. The density and selectivity of the functionalizations are very important for biomaterial applications. Low-temperature plasma treatment has been successfully applied to many types of polymers to generate functional surfaces. In this study, we focus on the s…
This article describes the graft copolymerization of methyl methacrylate (MMA) on to natural rubber (NR) by emulsion polymerization using cumene hydroperoxide and tetraethylene pentamine as redox initiators in NR latex. The effect of surfactants, cross-link density of NR, NR/MMA ratio, and mode of addition of monomer…
Open-end rotor-spun yarns, unlike ring-spun yarns, are basically of a three-part construction: a tensely packed core of (straight) fibres substantially aligned with the yarn axis, more loosely packed fibres twisted around the core and wrapper fibres on the outside. The presence of wrapper fibres on the yarn surface is…
The catalytic properties of CuO supported on ceria or ceria-zirconia mixed oxides have been investigated in the preferential oxidation of CO in H 2 -rich gases. CuO/CeO 2 shows very high activity towards the oxidation of CO with a light-off temperature of about 70°C. This catalyst is very selective for the oxidation o…
We show that diesel soot can be recycled as a carbon source for the synthesis of single-wall carbon nanotubes (SWNTs). The synthesis of SWNTs was carried out by the laser vaporization of diesel soot. The presence of SWNTs was confirmed by Raman spectroscopy and transmission electron microscopy. SWNTs produced in this…
The effect of plasma treatment on glassy carbon (GC) surfaces was studied with adhesion improvement in mind. A newly constructed remote plasma source was used to treat GC plates. Pure He and a dilute NH 3 /He mixture were used as feed gases. Optical emission spectroscopy was performed for plasma torch diagnostics. The…
Elastic properties are the basic quantities that are required during design and optimization of a laminated structure. Though the literature on elastic properties of conventional single fibre composite is well published, the same is scanty in the case of natural and hybrid composites. This work is focused on evaluatio…
A new mechanism is proposed for the energy relaxation of hot carriers in single-wall carbon nanotubes: scattering with the emission of surface optical phonons into the semiconductor substrate. The theory involves intrasubband and intersubband forward and backward scattering. The analytical result and numerical data in…
We present the results of a systematic study of the transport mechanism and magnetothermoelectric power (MTEP) of electron-doped manganites La0.85Te0.15Mn1−xCuxO3 (0⩽x⩽0.20). Two peaks are observed in thermoelectric power S(T) curves for x<0.10 samples. For x>0.10 samples, the very large S value with ove…
In the present work, the development of cellular films by stretching isotactic polypropylene (i-PP) filled with NA11 (2,2'-methylene-bis-(4,6-di-tert-butylphenyl)-phosphate) particles and hollow glass spheres is reported. Morphology, electret properties and piezoelectric activity are investigated. An enhancement of th…
Active magnetic regenerative refrigeration (AMRR) systems represent an environmentally attractive refrigeration alternative that does not use a fluorocarbon working fluid. Recently, families of magnetocaloric material alloys with adjustable Curie temperatures have been developed. Using these materials, it is possible…
The supercapacitor is a high efficient and green energy storage component that offers intensive charging and discharging current and performs a perfect reliability and cycling ability. In this paper, three topics are discussed for supercapacitor-based system research and application. Firstly, a comparison among severa…
In this paper, a circuit model for the description of left handed transmission lines based on complementary split rings resonators (CSRRs) is proposed. As compared to previous models, coupling between adjacent resonators is included in the present work. The conditions that make this coupling significant are discussed.…
Instrumented Taylor anvil-on-rod impact tests have been conducted on oxygen-free electronic copper to validate the accuracy of current strength models for predicting transient states during dynamic deformation events. The experiments coupled the use of high-speed digital photography to record the transient deformation…