Materials Literature
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This article investigates the toughness of yttria-stabilized zirconia (YSZ) with the tetragonal-prime ( t ′) structure. Such materials are used as durable thermal barriers in gas turbines. Their durability has been attributed to high toughness, relative to materials in the cubic phase field. Based on prior literature,…
Polycrystalline CeO2 nanorods 5-10 nm in diameter and 50-150 nm in length were synthesized via ultrasonication using polyethylene glycol (PEG) as a structure-directing agent at room temperature. The properties of the CeO2 nanorods were characterized by TEM, EDS, XRD, XPS, FT-IR, TG, BET, and UV-vis spectroscopy. Vario…
Finding a set of molecules, which closely resemble a given lead molecule, from a database containing potentially billions of chemical structures is an important but daunting problem. Similar molecular shapes are particularly important, given that in biology small organic molecules frequently act by binding into a defi…
The thermal and electrical conductivities in nanocomposites of single walled carbon nanotubes (SWNT) and polyethylene (PE) are investigated in terms of SWNT loading, the degree of PE crystallinity, and the PE alignment. Isotropic SWNT/PE nanocomposites show a significant increase in thermal conductivity with increasin…
Semiconductor nanocrystals produced by means of colloidal chemistry in a solvent medium are an attractive class of nanometer-sized building blocks from which to create complex materials with unique properties for a variety of applications. Their optical and electronic properties can be tailored easily, both by their c…
Highly isotactic polylactide or poly(lactic acid) is synthesized in a ring-opening polymerization (ROP) of racemic lactide with achiral salen- and homosalen-aluminum complexes (salenH(2)=N,N'-bis(salicylidene)ethylene-1,2-diamine; homosalenH(2)=N,N'-bis(salicylidene)trimethylene-1,3-diamine). A systematic exploration…
The experimentally verified electrical properties of carbon nanotube structures and manifestations in related phenomena such as thermoelectricity, superconductivity, electroluminescence, and photoconductivity are reviewed. The possibility of using naturally formed complex nanotube morphologies, such as Y-junctions, fo…
Nature provides a wide range of materials with different functions and which may serve as a source of bio-inspiration for the materials scientist. The article takes the point of view that a successful translation of these ideas into the technical world requires more than the observation of nature. A thorough analysis…
Up to now, there have been few studies of the temperature-induced liquid–liquid structure transition (LLST) kinetics for atomic systems. In this paper, through isothermal and heating experiments, we have investigated the kinetics of the LLST process in Pb–Sn61.9 wt% melt by measuring the electrical resistivity and hea…
Abstract Stoichiometric and nonstoichiometric polyelectrolyte complex (PEC) was prepared with polyethylene glycol‐monosuccinate (PEGMS), and chitosan (CS). A series of PEGMS were synthesized by a 1 : 1 mol ratio between PEG and succinic anhydride. Then, the novel PEC was prepared by a various mole reaction of the abov…
The authors report the formation of the metallic oxide p-I-n junctions with the ferroelectric (Ba,Sr)TiO3 (BST) as the barrier. The junctions with different thicknesses of BST are investigated. With appropriate thickness, the junctions possess definite parameters, such as the negligible reversed current density (⩽10−7…
Abstract Three novel hyperbranched polycarbosilazanes were synthesized via hydrosilylation reaction and characterized by FT‐IR, 1 H NMR, 13 C NMR, 29 Si NMR, and laser light scattering. First, one AB 4 type monomer bis( N , N ‐diallylamino)‐methylsilane ( M1 ) and two AB 2 type monomers ( N , N ‐diallylamino)‐dimethyl…
In this letter the authors report the growth of (110) oriented La0.7Sr0.3MnO3 films on (0001) single-crystal sapphire substrate. Growth of La0.7Sr0.3MnO3 (LSMO) films with a fixed orientation was achieved by carefully controlling the deposition conditions, specifically the substrate temperature. The fixed orientation…
Thin films of Nd3+∕Zr4+ cosubstituted Bi4Ti3O12 (BIT), i.e., Bi3.15Nd0.85Ti2.8Zr0.2O12 (BNTZ), were fabricated on Pt∕Ti∕SiO2∕Si(100) substrates by chemical solution deposition and annealed at different temperatures of 600, 650, 700, and 800°C. The effects of annealing temperature on the microstructure, leakage current…
Abstract NMR spectroscopy has served as a powerful tool to discriminate between the various types of subunits present in hyperbranched polymers. This discrimination is critical for the determination of degree of branching ( DB ), which is an important structural parameter that distinguishes hyperbranched structures fr…
Abstract Polypropylene/Ethylene–Octene copolymer (PP/EOC) blends were prepared by melt blending technique followed by compression molding. The effect of addition of EOC on the mechanical behavior of the PP matrix was investigated. Tensile and flexural strengths decreased with the incorporation of EOC. However, the imp…
Thermodynamic analysis shows that 180° ferroelectric domains under an external electric field behave as elastic domains due to the converse piezoelectric effect. The interdomain elastic interaction between 180° ferroelectric domains is an important factor in determining the effective dielectric and piezoelectric respo…
The frequency dependence of the dynamical-mode locking phenomena in the ac driven dissipative Frenkel-Kontorova model is studied by the molecular-dynamics simulations. It was found that the Shapiro steps exhibit very strong frequency dependence influenced by the amplitude of ac force. At the low frequencies, in the la…
The electronic energy band structure and linear optical properties of the ferroelectric semiconductor SbSI in the paraelectric phase are calculated by an ab initio pseudopotential method using density functional theory in the local density approximation. The calculated electronic band structure shows that SbSI has an…
Abstract The copolymerization of indole (In) and 3‐methylthiophene (3MeT) was successfully achieved electrochemically in boron trifluoride diethyl etherate (BFEE) by direct anodic oxidation of the monomer mixtures on stainless steel electrodes although their respective oxidation potentials were quite different. The el…