Materials Literature
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Toroidal caged molecules of carbon have been investigated previously as constructed from elbows formed from armchair (5,5) and zigzag (9,0) nanotubes connected through a pentagonal and heptagonal defect at each bend site. In this paper, we consider these elbows, and we describe two new elbows constructed from (3,3)-(5…
Abstract Polyvinyl alcohol (PVA)‐nanofibers‐immobilized lipase were formed by electrospinning. The specific surface area of the nanofiber (5.96 m 2 /g) was about 250 times larger than that of PVA‐film‐immobilized lipase (0.024 m 2 /g). The PVA‐nanofibers‐immobilized lipase were used as the catalyst for the esterificat…
This paper presents an extension of the Jiles–Atherton model, applied for modelling the magnetic characteristics of anisotropic amorphous material. The presented extension of the model takes into account changes in the parameter k during the magnetization process. Such an extension is physically judged. Moreover, the…
The mechanical threshold stress (MTS) model is not commonly used in industrial applications due to its complexity. The Zener–Hollomon parameter Z was utilized to develop a simplified and compact formulation similar to the MTS model. The predictions of the proposed formulation are compared to the results obtained by th…
Praseodymium and vanadium cosubstituted Bi 4 Ti 3 O 12 was synthesized using a modified citrate-gel method. The crystallization was promoted by the oxidation of residual carbon produced by decomposition of −CH x groups resulting in a crystallization temperature as low as 450 °C. The as-synthesized powder consisted of…
Zinc selenide nanoribbons were synthesized on silicon wafers by simple thermal evaporation of high purity ZnSe powder. The x-ray diffraction pattern indicates that all diffraction peaks can be attributed to the zinc-blende structured ZnSe. The selected-area electron diffraction, transmission electron microscopy and Ra…
Abstract A series of iPP/SiO 2 nanocomposites, containing 1, 2.5, 5, 7.5, and 10 wt.‐% fumed silica nanoparticles, were prepared by melt mixing in a twin screw co‐rotating extruder. The effect of different extrusion parameters was evaluated. The size of aggregates increased with increase in SiO 2 content and repetitio…
Abstract The rheological behavior of polypropylene/novolac blends was investigated with special reference to the effects of the blend ratio, compatibilization, and dynamic cure. The polypropylene and all the polypropylene/novolac blends presented evidence of shear‐thinning behavior. The novolac, compatibilizer, and dy…
Abstract The crystal morphology and nonisothermal crystallization kinetics of short carbon fiber/poly(trimethylene terephthalate) (SCF/PTT) composites were investigated by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The optical micrographs suggest that the more content of SCF in com…
A new route based on electrospinning is designed for the preparation of silver chloride/polyacrylonitrile (AgCl/PAN) composite nanofibres. The AgCl nanoparticles uniform in size, were dispersed on the surfaces of the composite nanofibres. Transmission electron microscopy (TEM) images gave direct evidence of the struct…
A scaling relation of the anomalous Hall effect recently found in a ferromagnetic semiconductor (Ti,Co)O 2 is compared with those of various ferromagnetic semiconductors and metals. Many of these compounds with relatively low conductivity σ x x ≤10 4 Ω -1 ·cm -1 are also found to exhibit similar relation: anomalous Ha…
Using the layer-by-layer (LbL) assembly technique, we create a polymer-clay structure from a unique combination of LbL materials: poly(ethylene imine), Laponite clay, and poly(ethylene oxide). This trilayer LbL structure is assembled using a combination of hydrogen bonding and electrostatic interactions. The films wer…
Molecular-dynamics and Monte Carlo simulations have been used to compute the crystal-melt interface stress $(f)$ in a model Lennard-Jones (LJ) binary alloy system, as well as for elemental Si and Ni modeled by many-body Stillinger-Weber and embedded-atom-method (EAM) potentials, respectively. For the LJ alloys the int…
New macromonomers containing dialdehyde functionalities placed at the middle or at the end of the chains were synthesized in two reaction steps. First, using ring-opening polymerization (ROP) of ε-caprolactone (CL) or atom transfer radical polymerization (ATRP) of styrene (St) in the presence of proper initiators prov…
This paper studies the elastic contact in filaments induced by surface adhesion, which plays an important role in the mechanical response of fibrous materials (e.g. fibre friction, sliding, compression hysteresis, etc). During the process, a simple 3D elastic contact model was proposed. The filaments were assumed to b…
Domain walls (DWs) in strongly correlated ferroics are expected to exhibit rich physical properties due to the competition between ground states that exists in these systems. A typical example is provided by ferromagnetic mixed-valence manganites for which insulating DWs in an otherwise metallic phase have been predic…
We report the results of dielectric measurements over the frequency range10 Hz–1 MHz and the temperature range 150–300 K on polyaniline subjected to doping with dichloroacetic acid (DCA) and trichloroacetic acid (TCA) with various doping levels (6.1%, 8.2%, 13.3% and 4.1%, 6.15%, 13.5%, respectively). Conductivity is…
The disposal of wastewater, known as vinasse, from the sugarcane ( Saccharum officinarum L.) industry creates environmental problems. Agriculture can offer a potential solution to these problems by using organic residues as substitutes for chemical fertilizers. This study was conducted in Ultisol profiles from Cuba ir…
The thermal investigation of matter by use of a very localized heat source, scanning thermal microscopy (SThM), permits materials to be probed at the level of very small subsurface volumes. Therefore, the technique appears to be a promising method to study the thermal properties of thin films of submicrometric thickne…
We present a comparative study of atomic and electronic structures, Young's modulus, and optical conductivity of trigonal bulk tellurium and its nanowires of different diameters using first-principles density-functional theory calculations based on pseudopotentials and a generalized gradient approximation to exchange-…