Materials Literature
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Phase diagrams of oligomer solutions have been constructed within the mean-field approximation. The free energy includes the configuration entropy and the formation free energy of both solvation shells of the oligomers and bonds between them, where this formation free energy depends upon the oligomer-solvent and solve…
We obtain convergent power-series representations for Bloch waves and their complex dispersion relation in an infinite periodic array of micro-resonators, which exhibits artificial bulk magnetism. The small parameter η of expansion is the ratio of period to wavelength, and the high conductivity is inversely proportion…
We report a chemical bath method to prepare ZnS thin films on glass substrates for solar applications. The proposed method is based on the experience to deposit CdS thin films by chemical bath but replacing some chemical reagents. The bath is composed of zinc chloride, potassium hydroxide, ammonium nitrate, and thiour…
Thin diamond-like carbon films were subjected to fluorination with gaseous XeF2 under ultrahigh vacuum conditions in order to increase the work function of the diamond-like carbon surface. Changes in the work function and surface composition were monitored with UV photoemission spectroscopy and x-ray photoemission spe…
The properties of carbon nanotubes can be dramatically altered by the presence of defects. In this work we address the properties of two different kinds of defective nanotubes: junctions of achiral tubes with topological defects and partially unzipped carbon nanotubes. In particular, we begin by focussing on the inter…
Recently introduced concept of active non-Foster metamaterial is reviewed with an emphasis on the counter-intuitive background physics. A basic building block of this active metamaterial is an active ‘tank circuit’ that contains both conventional reactance and non-Foster negative reactance. It is shown that active met…
Several Zn/Ni/Cu/Al layered double hydroxides (LDH) with variable Ni/Cu ratios but constant Zn/Al, as well as M2+/M3+ ratios, were synthesized by coprecipitation method with CO32- as compensating anion. The main goal of the study was to investigate the influence of the catalysts composition, especially Ni/Cu ratio, on…
The effect of process parameters on properties of polyester/viscose blended air-jet textured yarns has been studied. It is observed that with the increase in texturing speed the yarn physical bulk reduces, and instability and tenacity increase. With increasing air pressure or overfeed, the physical bulk and instabilit…
The qualitative characteristics of domain states and equilibrium tensor properties are given for 173 piezoelectric (electrooptic) species defined by point-group symmetries of parent and ferroic phases. The number and classification of principal ferroic, ferroelectric, ferroelastic, and piezoelectric (electrooptic) dom…
The mechanical properties of the single ZnO rod were studied using nanoindentation. The hardness and Young’s modulus of the polar (0001) and nonpolar (011¯0) faces were tested and the results demonstrate a face dependence variation in both properties. The mechanical behavior of the ZnO nano/microrod is discussed in co…
The photoexcitation and decay of photoconduction with UV irradiation have been studied in titanium oxide films prepared by the rf magnetron sputtering. Dynamic responses of photocurrent are represented by a stretched exponential function, and a long-term photocurrent decay suggests that the photoexcited carriers recom…
The temperature dependence of phonons in ZnO has been studied using resonance Raman and photoluminescence (PL) emission measurements. Excitation with wavelength 363.8 nm (photon energy 3.409 eV) is used to establish incoming resonance near room temperature. Broad PL emission is seen at room temperature with peak posit…
This paper systematically studies the rolling effects of the ( n, n ) single-wall carbon nanotubes (SWCNT) with different curvatures on Rh adsorption behaviours by using density functional theory. The outside charge densities of SWCNTs are found to be higher than those inside, and the differences decrease with the inc…
Cubic pyrochlore Bi1.5Zn1.0Nb1.5O7 thin films were deposited by pulsed laser ablation on Pt(200)/SiO2/Si at 500, 550, 600, and 650 °C. The thin films with (222) preferred orientation were found to grow at 650 °C with better crystallinity which was established by the lowest full-width half maxima of ∼0.38. The dielectr…
The sphere-shaped carbonyl-iron powder is used as a raw material for ball milling to produce flake-shaped carbonyl-iron particles. The morphology and the magnetic properties of the flake-shaped particles are investigated. The frequency-dependent complex permeability of paraffin composites with 50% volume concentration…
A series of fluorenylazomethine dyads and triads were prepared by simple condensation between the corresponding amine and aldehyde fluorene derivatives. These compounds were prepared as model compounds for investigating the effects of substitution and electronic groups on both the electrochemical properties and fluore…
The heat capacity, thermal expansion coefficient, and deformation of the PLZT-9/65/35 compound are studied in the temperature range 150–800 K. Diffuse anomalies are detected in the temperature dependences of the heat capacity and thermal expansion coefficient over wide temperature ranges of 250–650 and 330–550 K, resp…
Inorganic nanohybrid polyimide (PI) is widely applied in electrical and electronic devices for its outstanding insulating properties. Samples 100CR and 100NH are made in Dupont. Among them, 100NH is a kind of pure PI films; however, 100CR is a kind of inorganic nanohybrid PI films with excellent corona-resistance. The…
Based on the finite-deformation shell theory for carbon nanotubes established from the interatomic potential and the continuum model for van der Waals (vdW) interactions, we have studied the buckling of double-walled carbon nanotubes subjected to compression or torsion. Prior to buckling, the vdW interactions have ess…
Owing to the remarkable properties of chalcogenide glasses, chalcogenide optical waveguides should play a significant role in the development of integrated optics. This work demonstrates that an optical waveguide can be obtained by a simple proton implantation in gallium lanthanum sulphide (GLS) glass. Two modes exist…