Materials Literature
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Abstract In this investigation, the influence of filler type and filler content on the mechanical properties of nylon‐6 is investigated. The mineral fillers were selected on the basis of their shape and size: flake‐like kaolin and talc, spherical glass beads or fibrous wollastonite. These fillers were added to nylon‐6…
A general phenomenological description and a simple molecular model is proposed for the "discrete" flexoelectric effect in tilted smectic liquid crystal phases. This effect defines a polarization in a smectic layer induced by a difference of director orientations in the two smectic layers adjacent to it. It is shown t…
Abstract Various kinetic models, namely, the Avrami analysis modified by Jeziorny, the Ozawa model, and a method developed by Mo, were applied to describe the nonisothermal melt crystallization process of poly(ethylene terephthalate) (PET) and two PET/clay nanocomposites of different viscosities. The Avrami analysis m…
This paper describes the chemical functionalization of hydrogen-terminated porous silicon surfaces with simple and functional 1-alkenes under microwave irradiation to give organic monolayers covalently attached to the surface through Si−C bonds. Using microwaves as a source of energy led to a remarkable increase in th…
Ultrafine oxidized cellulose (OC) mats were prepared by oxidation of ultrafine cellulose mats produced by electrospinning and subsequent deacetylation of cellulose acetate for potential applications in nonwoven adhesion barriers. When ultrafine cellulose mats were oxidized with a mixture of HNO3/H3PO4 - NaNO2 (2/1/1.4…
Property and structure data from binary and ternary silicate and aluminosilicate melts and glasses often reveal simple and systematic relationships to composition and temperature. Properties whose dominant structural control is the abundance of fully polymerized Q 4 -species, exhibit smooth variations with silica cont…
Abstract Addressing the shape transition of silicon clusters, indicated by mobility experiments on silicon cluster cations with 24 to 30 atoms, we investigate the structure of low energy neutral silicon clusters with 25, 29, and 35 atoms within a density‐functional based tight‐binding approach. Since there is strong e…
We report a detailed investigation of the first stages of the growth of self-organized Fe clusters on the reconstructed Au(111) surface by grazing incidence X-ray diffraction. Below one monolayer coverage, the Fe clusters are in "local epitaxy" whereas the subsequent layers adopt first a strained fcc lattice and then…
By using femtosecond laser pulses at a wavelength range from 720 to 780 nm, we have observed absorptive and refractive nonlinearities in a film of multi-walled carbon nanotubes grown mainly along the direction perpendicular to the surface of quartz substrate. The Z-scans show that both absorptive and refractive nonlin…
We report the sidewall functionalization of soluble HiPco single-walled carbon nanotubes (SWNTs) by addition of dichlorocarbene. The dichlorocarbene-functionalized SWNTs [(s-SWNT)CCl(2)] retain their solubility in organic solvents such as tetrahydrofuran and dichlorobenzene. The degree of dichlorocarbene functionaliza…
Quantum leap: Very high quantum yields, thought to be impossible for nanocrystalline phosphor materials, were achieved with CePO4:Tb/LaPO4 core–shell nanoparticles (see picture). Because the LaPO4 shell reduces energy losses at the particle surface, transparent colloidal solutions of these 8-nm particles are highly ph…
The insolubility of single-walled carbon nanotubes (SWNT) in either water or organic solvents has been a limitation for the practical application of this unique material. Recent studies have demonstrated that the suspendability of SWNT can be greatly enhanced by employing appropriate surfactants. Although the efficien…
Polyhydroxyalkanoates (PHAs) are biopolyesters composed of hydroxy fatty acids, which represent a complex class of storage polyesters. They are synthesized by a wide range of different Gram-positive and Gram-negative bacteria, as well as by some Archaea, and are deposited as insoluble cytoplasmic inclusions. Polyester…
Abstract Synthesis of second generation poly(benzyl ether) dendrimers having N3O porphyrin at its core and the first observation of large micro-meter sized spherical aggregates as confirmed by optical microscopy and AFM analysis are reported.
Abstract Paper samples of three different qualities were extrusion coated with low‐density polyethylene (LDPE) and high‐density polyethylene (HDPE). The morphological phases of the polyethylene layers have been quantified by 13 C solid‐state high‐resolution NMR. Shear forces in the process initiate the formation of th…
Simple equations of effective demagnetizing factors N x e and N y e for use in Kittel's ferromagnetic resonance (FMR) formula have been derived for the first time. The effective demagnetizing factors are derived from anisotropy energy ( G ) and a static field direction expressed by a spherical coordinate system (θ,φ).…
Amorphous, as-deposited Nd–Fe–B films prepared by RF-sputtering were annealed by irradiating pulsed KrF excimer laser (248 nm). A pulse of 20 ns in width and 4 kJ/m 2 in power density was irradiated onto a 2 µm-thick as-deposited film kept at 400°C. It is observed that, by a single shot of the pulse, Nd 2 Fe 14 B Φ ph…
Highly ordered vanadium–iron cyanide molecular magnet nanowire arrays have been prepared for the first time using an electrodepositing technology with two-step anodized anodic aluminium oxide films. Selectable diameters and lengths of the nanowires can be obtained by controlling the diameters of the nanopores in the a…
Carbon-coated Co and Ni nanocrystallites were effectively synthesized by an AC arc discharge method under an N 2 atmosphere with yields over 80%. The metal content of as-made Co and Ni samples was determined by a thermogravimetric method and it was found that the metal content increased by raising the metal loading ra…
Conducting polypyrrole nanotubes are synthesized by an oxidation polymerization technique using an Anodisc alumina membrane as a template. The morphology is varied from solid rod-like structures to hollow tubes by changing the concentration of the ammonium persulphate (used as the oxidant) solution. The current distri…