Materials Literature
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Large class of new photonic devices, including light emitters, chemical sensors, and energy harvesters, can be made of the polymer-inorganic nanocomposite thin films produced by the new multiple-beam pulsed laser deposition process (MB-PLD). We describe the PLD system and the film deposition process itself, particular…
The effects of ageing temperature, time and cooling medium on the microstructure and hardness of a solution treated Ti6Al4V alloy were investigated. The furnace cooling after ageing for 0.5 hours gave a homogenous structure with higher hardness values than the solution treated and water quenched Ti6Al4V alloy. Increas…
In this paper, two tetrapyrrolic complexes, Zn(II)-5-(3-hydroxyphenyl)-10,15,20-tris-(4-acetoxy-3-methoxyphenyl)porphyrin and Cu(II)-5-(3-hydroxyphenyl)-10,15,20-tris-(4-acetoxy-3-methoxyphenyl)porphyrin were synthesized, and characterized from a spectral and biological point of view. The study provided data concernin…
Biodegradable Mg alloys are a new class of temporary implant materials for musculo-skeletal surgery. Recent studies show that Mg-based alloys can be biocompatible and there is a high demand to design Mg alloys with adjustable corrosion rates and suitable mechanical properties. An approach to solving this challenge mig…
Huge number of new photonic devices, including light emitters, chemical sensors, and energy harvesters, etc. can be made of the nanocomposite coatings produced by the new multi-beam pulsed laser deposition (MB-PLD) process. We provide a short review of the conventional single-beam PLD method and explain why it is poor…
Cu 2 O microcrystals (MCs) and nanocrystals (NCs) of various shapes were potentiostatically deposited on Ti substrates by exploiting the capping effects of differently charged surfactants on certain surfaces. Positively charged hexamethylenetetramine was adsorbed onto the {111} and {100} planes of the Cu 2 O crystals…
Amorphous carbon films (a-C:H) were prepared on a microtrench (4-μm pitch and 4-μm depth), and the uniformity of film thickness and microstructure of the films on the top, sidewall, and bottom surfaces of the microtrench were evaluated by scanning electron microscopy and Raman spectroscopy. The a-C:H films were prepar…
Proton-conducting biodegradable gellan gum gel polymer electrolytes (GPEs) have been prepared using three different dopants, namely ortho-phosphoric (o-H 3 PO 4 ), sulfuric (H 2 SO 4 ) and hydrochloric acids (HCl). The GPEs were cross-linked using borax. The polymeric gels were characterized by spectroscopic, thermal,…
Since opening sizable bandgaps in bilayer graphene (BLG) was proven possible, BLG has attracted considerable attention as a promising high-mobility candidate material for many electronic and optoelectronic applications. However, the bandgaps observed in the transport experiments reported in the literature are far smal…
Supercapacitors with the ability to charge/discharge at fast rates of up to 300 V s−1 are developed with monolithic electrodes of metal nanowire (NW) arrays. The defects in the NW-array electrode considerably influence the device performance. Both the energy and power densities can be simultaneously improved by removi…
This work reports on a very effective route to produce bio-based polyurethanes (PUs) and composites with high content of renewable carbon sources. The PUs are prepared with polyols synthesized from macauba oil (Acrocomia aculeata) and methylene diphenyl diisocyanate, at different [NCO]/[OH] molar ratios. Later, biocom…
We report on a new method for realizing an exceptionally strong inertial confinement of a gas in a liquid: A centimetric spherical bubble filled with a reactive gaseous mixture in a liquid is expanded by an exothermic chemical reaction whose products condense in the liquid at the bubble wall. Hence, the cavity formed…
This paper presents a damped oscillating voltage generator with a novel topology. In the proposed system, a sinusoidal voltage shape, rather than a cosinoidal shape, is used to detect the partial discharge (PD) of medium-voltage distribution power cables. Since this scheme uses a lithium battery instead of a high-volt…
Bismuth manganite ceramics has been obtained by high temperature sintering in air. It was found from the X-ray diffraction pattern analysis that the ceramics consists of two centrosymmetric phases: the cubic I23 and the orthorhombic Pbam. Impedance has been measured at radiofrequencies in 85–500 K range. Two relaxatio…
Mg especially in the molten state is well known for its high affinity to O 2 . When O 2 content of the atmosphere is larger than 4%, molten Mg will burn! To avoid this, melt protection is necessary. At present mostly SF 6 is used during primary production and processing of Mg and its alloys. Unfortunately SF 6 is a ve…
Charging effects in space are widely dominated by intrinsic and radiation-induced conductivities (RICs) of the irradiated materials. These data are needed by the community to perform charging predictions for assigned missions. This paper was dedicated to the characterization of bulk conductivity and RIC of polymers, c…
An original catalytic method has been proposed to synthesize carbon nanotubes ( CNT s)–ZrB 2 –ZrO 2 heterostructures using ZrB 2 polymeric precursor. The pyrolysized gases from the ZrB 2 polymeric precursor are identified to be the carbon sources for CNT s growth. A parametric study is conducted to control the CNT s g…
Periodate is used as an alternative oxidant in the rapid screening of new potential water oxidation catalyst material powders.
A variety of soil-dwelling bacteria produce polyhydroxybutyrate (PHB), which serves as a source of energy and carbon under nutrient deprivation. Bacteria belonging to the genus Pseudomonas do not generally produce PHB but are capable of using the PHB degradation product (R)-3-hydroxybutyrate [(R)-3-HB] as a growth sub…
Conductive nanoparticles, especially elongated ones such as carbon nanotubes, dramatically modify the electrical behavior of liquid crystal cells. These nanoparticles are known to reorient with liquid crystals in electric fields, causing significant variations of conductivity at minute concentrations of tens or hundre…