Materials Literature
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A novel porous chitosan/gelatin scaffold for tissue engineering was prepared via polyelectrolyte complex formation, freeze drying and post-crosslinking with glutaraldehyde. The porosity and mean pore diameters could be controlled within 30∼100 µm by varying the original water content and the freezing conditions. Dippi…
The thermodynamic properties of anion exchange on a chloride-intercalated zinc–aluminium layered double hydroxide have been studied at 298.15 K. The heats for total exchange of Cl− for F−, Br−, I−, OH−, NO3−, and SO42− have been determined by microcalorimetry and the standard molar enthalpies of these exchange reactio…
Dependencies of optical transmittance and luminescence of ${\mathrm{Y}\mathrm{A}\mathrm{G}:\mathrm{C}\mathrm{r}}^{4+}$ crystals upon intensity of excitation at 1064 nm are investigated, when absorption of tetrahedrally coordinated ${\mathrm{Cr}}^{4+}$ ions $({\mathrm{Cr}}^{4+}$ centers) is saturated. The spectroscopic…
Changes to the mechanical and physical properties of a glass-reinforced resole phenolic composite due to intense radiant heat and fire are investigated. Fire testing was performed using a cone calorimeter, with the composite exposed to incident heat fluxes of 25, 50, 75 or 100 kW/m2 for 325 s and to a constant flux of…
The recording of stable and reversible full-color images in the photon mode is reported here. The material is composed of the dicholesteryl ester shown in the Figure, which, when mixed with a small amount of an azobenzene derivative known to be photochemically isomerizable, is able to record full-color images (see als…
Recently the authors have presented a method to prepare activated carbon fiber with high bulk density (HD-ACF) without using any binders. The possibility of using the HD-ACF as an electrode for electric double‐layer capacitors (EDLCs) was examined in this paper. The capacitance of the EDLC with the HD-ACF electrode in…
The syntheses of the basic bismuth(III) nitrates [Bi6O5(OH)3](NO3)5·3H2O, A, [Bi6O6(OH)3](NO3)3·1.5H2O, B, and [Bi6O5(OH)3](NO3)5·2H2O, X, were investigated. A is readily obtained in hydrolysis of bismuth(III) nitrate solutions with sodium hydroxide solutions and in homogeneous hydrolysis with dilute solutions of urea…
The phase-field method is used to simulate the two-dimensional growth of a dendritic crystal in a forced flow. The selection of the velocity and shape of the dendrite tip is investigated as a function of flow rate, growth direction relative to the flow, as well as anisotropy strength, and the results for the upstream…
A case is presented for reconsidering deep borehole disposal for high‐level radioactive waste (HLW) in the light of recent discoveries about the hydrogeology and hydrogeochemistry of the continental crust. A new multi‐barrier concept is proposed for very deep, elevated‐temperature disposal of vitrified HLW, spent fuel…
The interest in lignocellulosic fiber composites has been growing in recent years because of their high specific properties. In this work, a new technique was used to prepare specimen to observe the transcrystalline zones in kenaf fiber-polypropylene composites. A maleated polypropylene (MAPP) coupling agent was used…
Most materials used in contemporary life and industry are heterogeneous (composites) and multicomponent, possessing a rich and complex internal structure. This internal structure, or microstructure, p
A simple reproducible one-phase preparation of highly monodispersed organically passivated gold nanoparticles is described. The effect of the capping ligand on the particle size is discussed along with the manipulation of the nanoparticles into colloidal crystals and 2D arrays.
The structure of a new modification of Ti2Se, the beta-phase, and several related inorganic crystal structures containing elements with atomic numbers between 16 and 40 have been solved by quasi-automatic direct methods from single-crystal electron diffraction patterns of nanometre-size crystals, using the kinematical…
A new, fast and simple numerical method is proposed for modelling data of thermogravimetric analysis under arbitrary temperature–time relationships. The algorithm searches for activation energies and rate constants by means of minimisation of the average square of deviation, Δ, between computed and experimental curves…
A sol–gel approach has been developed to prepare polyimide–TiO2 hybrid films from soluble polyimides and a modified titanium precursor. The rate of the hydrolysis reaction of titanium alkoxide can be controlled by using acetic acid as a modifier. FTIR and XPS indicated that TiO2 particles were well distributed in poly…
The effects of poly vinyl alcohol (PVA)/Chitosan/Fibroin (PCF)-blended sponge on wound healing in rats were investigated. We excised the skin of a rat, including the dermis, approximately 2 x 2 cm in size. The wound was covered with PCF-blended spongy sheets. The spongy sheets absorbed the exudate, and gained flexibil…
A novel soluble electroluminescent (EL) material, poly[(4-hexylthiophene-2,5-diyl)(9,9-dihexyl-9H-fluoren-2,7-ylene )(4-hexylthiophene-2,5-diyl)] (PHTDHFHT), with high absolute photoluminescence (PL) quantum efficiency (32 ± 3%) compared with other polythiophene derivatives, was synthesized and a green EL is observed.
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The morphological and structural features of WS2 nanotubes, generated from WOx (x ≅ 2.7) needles, by an in-situ heating process, have been studied by electron microscopy and X-ray diffraction (XRD), in conjunction with computer simulation. The results show that these inorganic fullerene nanotubes exhibit interesting d…
Although H2O has been the topic of considerable research since the beginning of the century, most of its anomalous physical properties are still not well understood. First we discuss some of the anomalies of this ‘‘complex fluid. ’’ Then we describe a qualitative interpretation in terms of percolation concepts. Finall…