Materials Literature
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A multi-arc model for applications to outdoor insulators under icing conditions is developed. In order to validate the model, several insulator types and configurations, with a dry-arc distance up to 4.17 m were tested under icing conditions. The applied water conductivity of the ice was varied between 30 and 150 muS/…
Gold oxide films obtained on the surface of polycrystalline gold foil upon oxidation by oxygen activated by a high-frequency discharge have been studied by X-ray photoelectron spectroscopy. High-frequency O2 activation affords oxide films more than 3–5 nm thick. As follows from Au4f spectra, the surface gold atoms are…
Increasing worldwide environmental awareness is encouraging scientific research into developing cheaper, more sustainable materials. Industrial hemp fiber is one of the strongest and stiffest available natural fibers [K. L. Pickering, M. Priest, T. Watts, G. Beckermann, and S. N. Alam, J. Adv. Mater. 37, 15 (2005)] an…
Thermoelectric modules composed of eight pairs of p ‐type Ca 2.7 Bi 0.3 Co 4 O 9 (Co‐349) and n ‐type CaMn 0.98 Mo 0.02 O 3 (Mn‐113) bulks were constructed using Ag electrodes and paste including powder of the n ‐type oxide. The former bulks were prepared by hot pressing. On the other hand, the latter were densified u…
In order to gain more information regarding photochemical processes in heterogeneous environments (opaque or powdered samples) laser induced time resolved luminescence and diffuse reflectance transient absorption spectroscopies were used for the study of benzophenone (and other neutral organic molecules) as guests and…
Step-like porous gold nanowires of different shapes and diameters have been prepared by sequentially depositing alloy segments composed of different gold/silver ratios and de-alloying the silver component. For example, step-cone and nano-barbell porous gold nanowires were generated by a membrane-templated sequential d…
Thermotherapy using magnetic nanoparticles, also termed nanotherapy, is a new therapeutic concept in which tumor cells are damaged via local heat application. The principle of this method is direct injection of a magnetic fluid into a tumor and its subsequent heating in an alternating magnetic field. The heat created…
One of the greatest obstacles nanoscale drug delivery systems face is the high nonspecific uptake by the reticular endothelial system (RES). Currently, PEGylation is the method of choice to address this problem. Herein we introduce an engineered high density lipoprotein-based nanocarrier (eHDL) as an enhanced cancer-t…
A series of pyrenyl complexes containing one or two AuPPh 3 or Pt(PEt 3 ) 2 Br groups have been synthesized to probe the effects of metal on the absorption and emission properties of the organic molecule. The absorption spectra of the complexes showed perturbation of the metal centers on the pyrenyl ring, as manifeste…
The effect of increasing the rare earth ion concentration on the physical and spectroscopic properties of Nd3 + doped sodium-lead-borate glasses have been studied for the compositions (10-x) Na2O-30PbO-60B2O3-xNd2O3, where x = 1.00, 1.25, 1.50, 1.75 and 2.00 mol %. Optical band gaps, cut-off wavelengths and various sp…
N-doped ZnO films were prepared by annealing zinc oxynitride films deposited by rf reactive sputtering. Two Raman peaks were observed at 274 and 580 cm−1. According to the variation of the integral intensity of these two peaks, the nitrogen activation at 500 °C [the activation temperature (AT)] has been obtained. Belo…
Alternative uses of pig manure are being considered, including separation and eventual incineration of the solid fraction to produce energy and ash. The efficiency of a screw press, a decanting centrifuge and chemical treatment in transferring N, P and heavy metals from slurry to a solid fraction were compared. Chemic…
Preparation of (001)-oriented Pb(Zr,Ti)O(3) (PZT) thin films and their applications to a sensor and actuators were investigated. These thin films, which have a composition close to the morphotropic phase boundary, were epitaxially grown on (100)MgO single-crystal substrates by RF magnetron sputtering. These (001)-orie…
A 3-D isotropic left-handed metamaterial based on the rotated transmission-line matrix (TLM) scheme is presented in this contribution. First, the discrete electrodynamics theory of the rotated TLM scheme is briefly revisited. The corresponding 3-D metamaterial is analyzed in terms of its dispersion relation, Bloch imp…
Polymeric materials often undergo large inhomogeneous deformations at high rates during their use in various impact-resistant energy-absorbing applications. For better design of such structures, a comprehensive understanding of high-rate deformation under various loading modes is essential. In this study, the behavior…
The aim of this study was to produce biopolymer-based nanocomposites using extrusion as an industrially adaptable manufacturing process, and to study how this production process influenced the structure and properties of the nanocomposites produced. Cellulose nanowhiskers (CNWs) were prepared and used as nanoreinforce…
Abstract Tissue engineering needs a biomaterial as a framework for single cells to build a vital and well functioning tissue. A future challenge is to modify biomaterials used this purpose in a way that they imitate in their composition and/or structure the native and physiological conditions for the tissue specific c…
Wool fabric is one of the fabrics normally suitable for autumn—winter garments. With the popularization of air conditioning, however, it is much hotter outdoors than indoors with a large temperature gradient in summer, under which circumstances the wearer finds it easier to sweat out of doors, and feels cold and clamm…
In engineering and materials science, nanotechnology has provided many advances that effectively reduce oxidative damage generated by free radical production. Despite such advances, there has been little application to biomedical problems. Increased oxidative stress and free radical production are associated with neur…
Abstract Delivery systems generated by reversible hydrazone formation from hydrazine derivatives (see Fig. 1 ) and carbonyl compounds in H 2 O efficiently increase the long‐lastingness of volatile aldehydes and ketones (R 1 R 2 CO) in various perfumery applications. The hydrazones are usually obtained in an ( E ) con…