Materials Literature
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Using molecular dynamics simulations, we study the effect of the brush grafting density and degree of polymerization of the side chains on conformations of brush layers made of charged bottle-brush macromolecules. The thickness of the brush layer first decreases with increasing brush grafting density; then, it saturat…
Raman spectroscopy technique has been successfully used to study the microscopic nature of structural and/or morphological properties of investigated nanopowders. The phonon confinement model has been applied for the estimation of nanocrystals dimensions (TiO 2 and CeO 2 ), as well as the correlation length (ZnO), fro…
The dependence of glass forming ability on liquid fragility is studied with thermodynamic and kinetic analyses. A general expression of the Gibbs free energy difference between an undercooled liquid and its equilibrium crystal is presented to address thermodynamically the fragility effect on glass formation. It is fou…
Molecular dynamics simulations were used to study the thermal conductivity of liquid argon ultra thin films confined between two plates spaced several nanometres apart. The research focused on the dependence of the liquid argon thermal conductivity on the liquid layer thickness and the interaction between liquid and s…
Currently, how to obtain near-infrared (NIR) dyes is intriguing and attractive but full of challenges. Although some cyanine dyes have been commercialized, near infrared dyes with intensive NIR absorption and/or emission, good chemical and photo-stability, and high solubility still remain as challenging targets. Certa…
We prepared a series of microporous films based on poly(d,l-lactic acid) (PLA) via phase separation. According to scanning electron microscopy (SEM), a 3-dimensional foamy structure with multimicrometer scale pores on the air surface of film could be observed. As the morphology of PLA film could not be stabilized usin…
Size-dependent quantum confinement effect on electronic structure of hydrogen-terminated carbon nanodiamond (ND) cluster has been investigated at the hybrid density functional theory level. Large scale all-electron calculations have been carried out for ND clusters of 0.76 nm (29 carbons) to 7.3 nm (20 959 carbons) in…
The rheological properties of high-generation carbosilane dendrimers carrying different kinds of terminal groups are studied. It is shown that the nonlinear viscoelastic behavior of dendrimers and the high-temperature relaxation transition in dendrimers are interrelated and result from the reversible breakdown of the…
A physicochemical study of glasses based on the MO-Bi 2 O 3 -B 2 O 3 and SrO-Bi 2 O 3 -B 2 O 3 systems was performed. Glass formation regions were found. The structural and optical properties, as well as the thermal behavior of the glasses, were studied.
Article The Effect of Temperature and Gel Concentration on the Rheological Properties of Ultra High Molecular Weight Polyethylene (UHMWPE) in Decalin was published on November 1, 2010 in the journal Journal of Polymer Engineering (volume 30, issue 9).
The structure of quenched aluminosilicate glasses with Na 2 O/Al 2 O 3 > 1 has been studied by high-resolution nuclear magnetic resonance spectroscopy. The aluminum in the structure of the glasses is shown to be in fourfold coordination. Increasing the sodium oxide content of the glasses reduces the degree of polymeri…
Recently, the lead free piezoelectric material, which could be used for the actuator and the sensor of medical care devices, such as the health monitoring system (HMS) and the drug delivery system (DDS), is strongly required. In this study, we try to find a new biocompatible and lead-free piezoelectric material, by us…
Stricter emission standards are forcing automakers to couple the catalytic converters closer to the engine exhaust. Mounting the catalytic converter (DOC) at or near the exhaust manifold helps to reduce the increase in emission after a cold engine is started. The spike occurs because cold engines require a richer air-…
This paper presents the results of an experimental study on the physical and mechanical changes suffered by glass-fibre-reinforced polymer (GFRP) pultruded profiles, made of either unsaturated polyester or vinylester resins, after accelerated hygrothermal ageing. Specimens from both types of profiles, comprising ident…
Cadmium indium selenide (n-CdIn 2Se4) thin films have been synthesized by spraying the mixture of an equimolar solutions of cadmium chloride [CdCl2], indium trichloride [InCl3] and selenourea [(NH2)2CSe] in aqueous media onto preheated fluorine doped tin oxide (FTO) coated glass substrates at optimized parameters of s…
Nano-MgO powders with different size form 30 to 100 nm are prepared and measured by XRD and IR. FTIR results show that nano-MgO powder has abnormal infrared absorption behaviors compared with that of micron scale; and there exist blue shifts of infrared absorption peaks with the decrease of the particles size. But whe…
The interaction between the metamaterial composed of split-ring resonator (SRR) and the THz electromagnetic wave is investigated by the simulation. Only one resonance occur in the unit cell of the metamaterial composed of single SRR, whereas two evident resonances at different frequencies occur in the unit cell compos…
The properties of diffraction gratings and multilayered systems constructed using 1D models of quasicrystals are considered based on numerical simulation. It is shown that there is a direct relationship between the self-similarity symmetry of quasicrystals and scaling in the characteristics of the above-mentioned opti…
In this paper, the morphological transformations in Hibiscus sabdariffa (Roselle) stem fiber on graft copolymerization with Butyl acrylate (BA) and its binary mixture with Acrylic acid (AA) and Acrylamide (Aam), using ceric ammonium nitrate – nitric acid initiator system was reported. Different reaction parameters suc…
A series of SrFe x Co0.5O3 − δ (x = 0.5, 0.75, 1.0, 1.25) powders have been synthesized by the citrate method. The effect of Fe content on the properties of the SrFe x Co0.5O3 − δ was investigated by X-ray diffraction (XRD), thermo-gravimetric analysis and differential scanning calorimeters (TGA/DSC). XRD results reve…