Materials Literature
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Abstract The surface characteristics of several natural fibers—flax, hemp and cellulose—were investigated using scanning electron microscopy, BET‐surface area and zeta (ζ‐) potential measurements. ζ‐Potential measurements using the streaming potential method were performed in order to study the water uptake behavior a…
Nanoporous polystyrene monoliths were prepared from polystyrene-polylactide (PS-PLA) block copolymers that form hexagonally packed nanocylinders of PLA in a PS matrix. A morphology diagram was developed to determine the range in composition and molecular weight over which this morphology existed. Macroscopic alignment…
Different partial discharge (PD) detection and measurement procedures suitable for use on cables, capacitors, transformers and rotating machines are examined and compared. Both narrow and wide bandwidth PD detectors are considered; particular attention is given in regard to their suitability to different types of elec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleLewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous SystemsAvelino Corma and Hermenegildo GarcíaView Author Information Instituto de Tecnología Química CSIC-UPV, Avda. de los Naranjos s/n, Universidad Politécnica de Valencia, 46022 Valencia, Spain…
hcp Co disk-shaped nanocrystals were obtained by rapid decomposition of cobalt carbonyl in the presence of linear amines. Other surfactants, in addition to the amines, like phosphine oxides and oleic acid were used to improve size dispersion, shape control, and nanocrystal stability. Co disks are ferromagnetic in char…
We herein present the synthesis, crystal structure, and magnetic properties of a new heterometallic chain of MnIII and NiII ions, [Mn2(saltmen)2Ni(pao)2(py)2](ClO4)2 (1) (saltmen2- = N,N'-(1,1,2,2-tetramethylethylene) bis(salicylideneiminate) and pao- = pyridine-2-aldoximate). The crystal structure of 1 was investigat…
The crystal structure of [Cu(C12H8N2)3][C(CN)3]2 is composed of discrete [Cu(phen)3]2+ cations (phen is 1,10-phenanthroline) and [C(CN)3]− anions. The CuII atom is octahedrally coordinated by the three phen ligands. As a consequence of the Jahn–Teller effect, the two axial Cu—N bonds of 2.219 (3) and 2.238 (3) Å are l…
The efficacy of octylamine as a vapour phase corrosion inhibitor in different corrosive environments for carbon steel, copper and brass, and its biocidal action, have been examined. The protection of these metals from atmospheric corrosion using VPI (octylamine)‐impregnated paper was monitored by visual observation, w…
BACKGROUND: The polymorphic forms of silica (silicon dioxide; SiO(2)) interact with the cell membranes of many mammalian cells, including red blood cells (RBCs), causing hemolysis. The electrostatic factor, which is believed to be a major contributor to the silica-cell contact, might have potential interest for the st…
The Doi theory has successfully modeled the monodomain shear flow problem for rigid, rodlike nematic polymers. Numerical simulations of the Smoluchowski equation for the orientational probability distribution function (PDF) predict monodomain attractors in regions of nematic concentration N and shear rate gamma. Theor…
A set of computer simulations for three symmetric A-B-A triblock copolymer microarchitectures at varying temperatures is reported. By using the cooperative motion algorithm we obtain energy, specific heat, end-to-end distance, and bridging fraction as a function of the reduced temperature. The order-disorder transitio…
The degradation of an organic dye molecule (specifically meldola blue, MDB) is reported under the influence of power ultrasound in combination with electrochemically-generated hydrogen peroxide. A novel flow system is employed to measure the degradation as a function of time while minimising the disturbance to the aco…
A series of adsorption tests examined the uptake of typical quaternary cationic surfactants, dodecyltrimethylammonium bromide and hexadecyltrimethylammonium bromide from water by a clay mineral, sepiolite. Adsorption tests conducted under different conditions revealed that sepiolite is highly receptive to adsorption o…
The two-way shape memory effect (TWSME), has been studied in a near-equiatomic NiTi commercial alloy. Two bending training methods have been applied on NiTi wires. One is based on the martensite deformation and the other on thermal cycling under constant bending curvature. The efficiency of each method has been evalua…
Besides properties commonly found for all types of dendrimers, phosphorus-containing dendrimers possess some specific properties seldom or never found for other types of dendrimers. Emphasis will be put on these specificities.
Results are presented of in situ studies of the thermoelectric power and four-probe resistance of single-walled carbon nanotube films during the adsorption of cyclic hydrocarbons C(6)H(2n) (n=3-6). The size of the change in these transport parameters is found to be related to the pi electron population of the molecule…
I show that a spontaneous electric polarization exists in the solution of the Falicov-Kimball model by mapping the strong coupling limit of this Hamiltonian into an xxz spin 1/2 model with a magnetic field. In this way, I determine the phase diagram of the strongly interacting model and show the existence of a transit…
Actin networks cross-linked by natural linkers $\ensuremath{\alpha}$-actinin and filamin are generated in giant vesicles by polymerization through ionophore-mediated influx of ${\mathrm{M}\mathrm{g}}^{2+}$. $\ensuremath{\alpha}$-actinin induces the formation of randomly linked networks at 25 \ifmmode^\circ\else\textde…
An improved method for the modelling of carbon structures based on a hybrid reverse Monte Carlo (HRMC) method is presented. This algorithm incorporates an accurate environment dependent interaction potential (EDIP) in conjunction with the commonly used constraints derived from experimental data. In this work, we compa…
In Spain, the steel manufacture produces important quantities of by-products, representing between 15 and 20 % of total steel production. Most by-products are deposited on open air spaces causing serious economical and environmental problems, internationally, different recycling wais are studied, being the main altern…