Materials Literature
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This article focuses on gaining a fundamental understanding of the bubble growth and collapse phenomena in a chemical blowing agent (CBA)based foaming process under atmospheric pressure. The behavior of CBA-blown bubbles exposed to various processing conditions is observed using a hot-stage optical microscope-based im…
Abstract The polymerization conditions for polystyrene and poly(methyl methacrylate) crosslinked by 0.5 mol % of the cluster Zr 6 O 4 (OH) 4 (methacrylate) 12 were optimized by applying a step polymerization procedure. The onset of thermal decomposition was thus increased up to about 50° for polystyrene and about 110°…
This work is concerned with the effect of the nanostructure on the electrical conductivity of n-type In-doped PbTe thin films. Nanostructured thin films were prepared by varying the rate of nucleation as a function of the nature and temperature of the substrates. On low-temperature substrates, the increased rate of nu…
Bi 0.5 Na 0.5 TiO 3 (BNT) bulk ceramics with a preferred <100> orientation (texture) were prepared by the reactive-templated grain growth method using platelike Bi 4 Ti 3 O 12 (BiT) particles as templates for BNT. The texture did not develop extensively in stoichiometric BNT, but the addition of excess Bi 2 O 3…
The static, dynamic, and attenuation properties of BaCoZnFe16O27 barium ferrites and their composites have been studied using microparticles and nanoparticles. The results showed that BaCoZnFe16O27 microparticles have larger saturation magnetization Ms and smaller coercivity Hc than do nanoparticles. The composites wi…
We have investigated the phonon and the magnetic excitations in ${\mathrm{LaCoO}}_{3}$ by inelastic neutron scattering measurements. The acoustic phonon dispersions show some characteristic features of the folded Brillouin zone (BZ) for the rhombohedrally distorted perovskite structure containing two chemical formula…
Therapeutic uses of a variety of drug carrier systems have significant impact on the treatment and potential cure of many chronic diseases, including cancer, diabetes, mellitus, rheumatoid arthritis, HIV infection, and drug addiction. Drug delivery technology is a multidisciplinary science involving the physical, biol…
Abstract Polymer blends based on poly(ethylene 2,6‐naphthalate) (PEN) and poly‐(ethylene terephthalate) (PET) reinforced with a thermotropic liquid crystal polymer (TLCP) were prepared using a melt blending process. Polymer blends consisting of conventional cheap polyester with a small quantity of expensive TLCP are o…
Abstract Copper is thought to be noncatalytic to carbon deposition from gas atmospheres, and owing to its extremely low solubility for carbon, inert to the metal dusting reaction. Thus, the addition of copper to nickel, which forms a near perfect solid solution, may be able to suppress or greatly retard the metal dust…
Vertical single-crystal ZnO nanowires with uniform diameter and uniform length were selectively grown on ZnO:Ga/glass templates at 600/spl deg/C by a self-catalyzed vapor-liquid-solid process without any metal catalyst. It was found that the ZnO nanowires are grown preferred oriented in the [002] direction with a smal…
Mesoporous ethane−silicas functionalized with trans -(1 R,2 R )-diaminocyclohexane were synthesized by one-step co-condensation of 1,2-bis(trimethoxysilyl)ethane and N -[(triethoxysilyl)propyl]-(−)-(1 R,2 R )-diaminocyclohexane using octadecyltrimethylammonium chloride as the template under basic conditions. For compa…
Unstable plastic flow has been observed in the parabolic stage of work hardening of a zirconium alloy, which was manifested by periodic variations of a spatiotemporal pattern of the local strain distribution. A synergistic model explaining this behavior is proposed according to which the plastic flow evolution in the…
The absorption and circular-dichroism spectra of neodymium-doped crystals of langasite La3Ga5SiO14 and the compounds La3Ga5.5Nb0.5O14 and Pb3Ga2Ge3.92Si0.08O14, isostructural with langasite, are investigated in the wavelength range 320–940 nm. Electronic transitions in Nd atoms, which substitute the main cation of the…
Thermal shock of a three‐dimensional (3D) SiC/SiC composite prepared by chemical vapor infiltration (CVI) process was conducted using water quenched method. Thermal shock damage of the composite was assessed by SEM characterization and measurement mechanical properties using three‐point flexure after quenching. After…
The de-vulcanization of rubber waste poses a challenging economical, environmental and social problem. We propose a new de-vulcanization process to re-use the rubber waste. It is a mechano-chemical process (MCP), where the waste is de-vulcanized by a combination of mechanical shearing, heat (110 °C) and the use of a d…
The authors studied the thermal conductivity, water absorption and linear burn rate of natural fibre reinforced polymers (NFRP). High density polyethylene (HDPE) and degradable starch-based polymers were used as matrices. Discrete sisal ( Agave Sisalacea ) fibres were used as reinforcement. The effect of fibre content…
The adsorption of carbon dioxide on mesoporous silicas was studied near the critical temperature (T c ) of CO 2 , i.e. 304.2 K. The critical temperature in the mesopores at which the first-order phase transition (capillary condensation) was observed (T cp ) was estimated from the inverse slope of the adsorption isothe…
In order to evaluate the influence of substitution at the central metal ion position in transition hexacyanometallates in some detail, the magnetic studies were carried out on a series of solid solutions of metal hexacyanometallates of the composition M[FeII(CN)6]1− x [CrIII(CN)6] x , where M = NiII and FeIII. The tem…
An internal friction peak due to hydrogen in Fe 55 Cr 45- x Ni x ( x =20–45) and Fe 100- x Ni x ( x =35–100) alloys was observed. A gas-equilibration method was employed in order to charge specimens homogeneously with hydrogen. In Fe 55 Cr 45- x Ni x alloys, the peak height significantly increased as the nickel conten…
Carbon nanotubes (CNTs) devices have been fabricated using two similar microfabrication processes involving poly(dimethylsiloxane) (PDMS) molecular stamping of 2-thiolpyridine and subsequent self-assembly of CNTs. The two methods allow the fabrication of CNT devices with &gt;90% yield. From Vg=−5to+5V, when Ti–Au…