Materials Literature
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We studied the photoluminescence (PL) and photovoltaic current-voltage characteristics of the three-junction InGaP/InGaAs/Ge solar cells by depositing Au nanoclusters on the cell surface. The increases of the PL intensity and short-circuit current after incorporation of Au nanoclusters are evident. An increase of 15.3…
We synthesized hybrid materials by sol-gel process, using: methyltriethoxysilane, tetraetylorthosilicate and vinyltriethoxysilane, in the presence of Rhodamine 6G. It was synthesized as well organic-inorganic hybrids with addition of tetraisopropyl orthotitanate and maleic anhydride UV-VIS spectra of dye show two abso…
We report a method to synthesize amorphous hollow carbon spheres, with diameters ranging from 100 to 800 nm, which are dispersed among bent graphitized carbon nanotubes using radio frequency plasma-enhanced chemical vapour deposition in mixed CH 4 /H 2 gases. The products are characterized by techniques including scan…
BaTiO3 xerogel hollow fibers have been prepared firstly by co-electrospinning the sol precursor, and the polycrystalline BaTiO3 ceramic hollow fibers were obtained after calcination at 1000°C. The obtained hollow fibers made up of well-crystallized nanocrystals were about 400 nm to several micrometers in outer diamete…
Abstract Immiscible blends of high molecular weight commercial poly( p ‐dioxanone) (PPDX) and poly(ε‐caprolactone) (PCL) were prepared by melt mixing in a wide composition range. The materials were exposed to a hydrolysis medium (phosphate buffer kept at a constant pH of 7.2) at 37°C during 36 weeks. The change in wei…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPseudo-Single-Crystalline Self-Assembled Structure Formed from Hydrophilic CdSe and Hydrophobic Au Nanoparticles in the Polystyrene and Poly(4-vinylpyridine) Blocks, Respectively, of a Polystyrene-b-poly(4-vinylpyridine) Diblock Cop…
A nonlinear theory is developed for a heat-conducting viscoelastic composite which is modelled as a mixture consisting of a microstretch Kelvin–Voigt material and a microstretch elastic solid. The strain measures, the basic laws and the constitutive equations are established and presented in Lagrangian description. Th…
Abstract Poly(lactic acid)–poly(ethylene glycol)–poly(lactic acid) (PLA‐PEG‐PLA)/SiO 2 hybrid material is prepared by sol–gel method using tetraethoxysilane (TEOS) and PLA‐PEG‐PLA as raw material. From Fourier transform infrared spectroscopy (FTIR) and X‐ray photoelectron spectroscopy (XPS) spectra, the hydroxyl group…
The constrained optimization approach is applied to the design of quasi-rugate optical coatings. These coatings are defined as multilayers with no thin layers where refractive index profiles resemble rugate-type refractive index profiles and where spectral properties are typical for rugate filters. It is shown that al…
Using the method of direct integration, we found continuous and integrable solutions of the differential equations for plane elasticity and thermoelasticity in a semi-plane with the traction, displacement, or mixed type boundary conditions. We established the one-to-one relations between the tractions and displacement…
Abstract The method used in the past 30 years for describing the swelling of polymers by solvents is mainly based on the Hansen three‐dimensional solubility parameters. However, the subjectivity of its implementation as well as its limited success for several polymers, and in particular elastomers, which constitute ch…
Aligned carbon nanotubes have great potential for advanced nanotube transistors and integrated circuits. In this article, we studied the carbon nanotube alignment mechanism using a chemical vapor deposition growth on a-plane sapphire substrates. We synthesized carbon nanotubes of different diameters by controlling the…
Abstract A gel‐spinning process was used in an attempt to prepare a gelatin fiber with a high level of drawability. A gel fiber prepared by extrusion of 15 wt % gelatin in dimethyl sulfoxide into methanol at −20°C was drawn to sixteen times the original length. After extraction of the dispersion medium, the mechanical…
Abstract Tellurates are rare minerals as the tellurate anion is easily reduced to the tellurite ion. An example of a tellurate‐containing mineral is kuranakhite. Two bands at 617 and 686 cm −1 are observed and assigned to the Te 6+ O 6 ν 1 symmetric stretching mode. The observation of two bands suggests the non‐equiva…
We develop a novel and simple method for controlling the area density of ZnO nanowires vertically grown on a Si substrate. The method is based on blending spherical polystyrene- block -poly(acrylic acid) (PS- b -PAA) micelles with polystyrene- block -poly 4-vinylpyridine (PS- b -P4VP) for the area density control of A…
We revisit the equilibrium properties of a classical one-dimensional system of hardcore particles in the framework provided by the multiparticle correlation expansion of the configurational entropy. The vanishing of the cumulative contribution of more-than-two-particle correlations to the excess entropy is put in rela…
The production of advanced optical coatings with complex spectral characteristics and high performance is directly dependent on the stability of the deposition process and on the accuracy of the monitoring system employed for controlling the thickness of the constituent single layers. The present contribution is conce…
The simultaneous multiple surface (SMS) method has been used to design nonimaging devices, such as solar concentrators and collimators, which work near the thermodynamic limit at highest efficiencies. The very high compactness of these devices is obtained through the simultaneous design of two high-order (above 30<sup…
Microphase separation of AB multigraft copolymers with various numbers of graft arms per junction along the backbone was examined by the random-phase approximation and real-space implemented self-consistent field theory. The calculations carried out show that the number of graft arms per junction exerts a marked effec…
Abstract Aminoresin precursors prepared by the addition of a new, colorless, nonvolatile and nontoxic aldehyde, dimethoxyethanal (DME), to melamine or urea gave resins for boards that were able to harden, however they were underperforming because of the lower reactivity of DME in relation to formaldehyde. Melamine and…