Materials Literature
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Abstract The flow stress of bulk specimens is known to depend on the microstructure. With a reduction of specimen dimensions into the micrometer and nanometer regime, specimen size-effects also influence the mechanical properties. We characterized the size-dependent flow stress of copper over more than three orders of…
Recent advances in the synthesis of nanowires based on conducting conjugated polymers are described. The results of recent experimental studies of the electrical properties of polymer nanowires are critically analyzed. The applicability of various theoretical models of tunneling in one-dimensional conductors (variable…
Abstract We demonstrate filling of single‐wall carbon nanotubes with ferrocene. Encapsulated ferrocenes are utilized as a precursor to secondary inner tubes and iron dopant. The reaction pathway is traced by Raman and photoemission spectroscopy. From a comparison to the inner‐tube growth from C 60 fillers we propose d…
Understanding carrier transport in carbon nanotubes (CNTs) and their networks is important for harnessing CNTs for device applications. Here, we report multishell carrier transport in individual multiwalled CNTs, and films of randomly dispersed multiwalled CNTs, as a function of electric field and temperature. Electri…
Magnesium alloys are becoming widely recognised as the candidates to replace steel and aluminium alloys, especially in automotive industries and thereby they have potential to be widely used. In the present paper, resistance spot welding (RSW) was performed on 1 mm thick AZ31B magnesium alloy sheets. The effect of wel…
Hexagonal KCaGd(PO4)2:RE3+ (RE=Ce,Tb,Eu,Tm,Sm) were synthesized by coprecipitation method and their vacuum ultraviolet–ultraviolet (VUV-UV) spectroscopic properties were investigated. The bands at about 165nm in the VUV excitation spectra are attributed to the host lattice absorptions. For Ce3+-doped samples, the band…
Abstract Electron microscopic observations revealed the development of a complex interpenetrating morphology of magnesia and tantalum after magnesium-vapour reduction of tantalum oxide powder. In the early reaction stage, a nanoscale lamellar and rod-like morphology is found. This rather regular structure decomposes a…
Magnesium alloys are potential biodegradable implant materials. However, magnesium alloys normally corrode rapidly in the in-vivo fluid, resulting in subcutaneous gas bubbles and alkalisation of the in-vivo solution. The paper presents a new approach to control the degradation rate of magnesium in a simulated body flu…
Polyols based on natural oils (NOPs) can be used in formulations of various polyurethane materials including foams with the cell structure and properties required for their typical applications. Vegetable oils such as rapeseed, soybean, sunflower and linseed oils may be applied as raw materials but first, they need to…
We compare design and measurements for a single-layer meanderline quarter-wave phase retarder, operating across the wavelength range from 8 to 12 micrometers (25 to 37.5 THz) in the infrared. The structure was fabricated using direct-write electron-beam lithography. With measured frequency-dependent material propertie…
We describe herein the synthesis of generation 4 (G4) poly(amidoamine) (PAMAM) dendrimers bearing (1) a nitroaniline derivative as an NMR probe, (2) (η 5 -cyclopentadienyl)iron dicarbonyl succinimidato complexes as infrared probes for carbonyl metallo immunoassay, (3) acetamide groups for increased solubility, and (4)…
The purpose of the present study was a multivariate experimental analysis of continuous multifilament glass yarns. The experimental design involved four main factors affecting the yarn tensile behavior, namely twist, fineness, loading rate and specimen length. In the evaluation, both the main effects and their interac…
The structure of one-dimensional photonic crystal (1DPC) containing indefinite metamaterials with a hyperbolic dispersion relation is proposed to realize the omnidirectional gap for the design of omnidirectional reflectors and filters. It is demonstrated that this 1DPC can result in a similar zero average index (zero-…
This paper reports on the results of measurements of the conductivity in MnSe and MnTe polycrystalline samples under thermal cycling in the temperature range 80 < T < 300 K in magnetic fields of up to 5 kOe. Manganese selenide MnSe is found to exhibit a magnetoresistive behavior below the Néel temperature. The specifi…
A donor−π−acceptor dyad with a highly electron-deficient B(C 6 F 5 ) 2 group as the acceptor has been prepared. 5-Diphenylamino-5‘-bis(pentafluorophenyl)boryl-2,2‘-bithiophene ( 3 ) was fully characterized by multinuclear NMR spectroscopy, mass spectrometry, and X-ray crystallography. The solid-state structure of 3 sh…
We search for the existence of the post-perovskite structure in several nonmagnetic ${M}_{2}{\mathrm{O}}_{3}$ sesquioxides using density-functional calculations. For each material we consider the corundum, ${\mathrm{Rh}}_{2}{\mathrm{O}}_{3}$-type II, perovskite, and post-perovskite structures. The perovskite structure…
Hydrogels composed of collagen and hyaluronic acid are types of crosslinked water-swellable polymers and possess vast potential for applications in the medical industry. Collagen (Co) is the major structural protein of connective tissues such as skin, tendon and cartilage. Hyaluronic acid (HA) is a non-immunogenic, no…
A methodology recently introduced to describe orientational order in liquid carbon tetrachloride is extended to the plastic crystal phase of XY4 molecules. The notion that liquid and plastic crystal phases are germane regarding orientational order is confirmed for short intermolecular distances but is seen to fail bey…
Complementary experiments and simulations are conducted to characterize the microstructure and mechanisms involved in recompression of spalled ductile metals. Soft capture experiments performed on copper targets in a gas gun include a dense secondary plate spaced behind the customary flyer to recompress the voids in t…
The nanostructured rugate porous silicons (PSi) containing multiple photonic band gaps have been generated by an electrochemical etching through applying a composite waveform summed three computer-generated pseudo-sinusoidal current waveforms. They exhibit three sharp photonic band gaps in the optical reflectivity spe…