Materials Literature
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Polyaniline (PANI) sandwich structures with Al and/or Au electrodes have been investigated using temperature dependent I-V measurements and impedance spectroscopy in the 50 mHz -1 MHz frequency range. The I-V measurements on the Au/PANI/Au structure have shown a practically Ohmic behavior, while the Au/PANI/Al structu…
Abstract An aerosol generated by the ultrasonic oscillation of either a 0.2 M or a 0.02 M solution is supplied through two furnaces onto heated glass substrates of Corning #1737 to coat thin films of indium tin oxide (ITO; Sn‐doped In 2 O 3 ). The electrical resistivity, the carrier concentration, the Hall mobility, a…
The transformations of platinum and a heteropoly acid (HPA) in binary systems prepared from H2PtCl6 or H2PtCl4 and H3PMo12O40 were studied using IR and UV-VIS spectroscopy, elemental analysis, XPS, EXAFS, TPR, and HREM. The calcination of platinum chloride with the HPA to 450°C resulted in the formation of a platinum…
This work investigates the generation and detection of gaseous scintillation signals produced in variable pressure scanning electron microscopy through electron-gas molecule excitation reactions. Here a gaseous scintillation detection (GSD) system is developed to efficiently detect photons produced via excitation reac…
Non-oxide ceramic-matrix composites (CMCs) are subjected to be used in aeronautic applications which require very long duration (up to 100 000h) of materials at high temperatures and under air. Recently a self-healing [Si-B-C] matrix has been developped to enhance strongly the lifetime of CMCs under air. The aim of th…
Track membranes are porous systems consisting of a polymer foil with thin channels (i.e. pores) piercing it from surface to surface. The creation of non-cylindrical pores in a track membrane is important for the optimization of membrane characteristics, i.e. the highest productivity at the required selectivity. A new…
Abstract Migration study in aqueous and olive oil food simulants was carried out on PP and its blend with oil mixture. It was found that after 10 days at 44 °C PP with oil content up to 0.83% had overall migration into olive oil less than 10 mg/dm 2 . However, under high temperature migration test (at 110–138 C for 4…
We present a continuum model for the calculation of the electron states in Si dots that accounts for the effects of size, shape, and crystallographic orientation of the dots. This formalism has been used to study the behavior of the photoluminescence (PL) lifetime in Si quantum dots. This is due to the anisotropy of t…
Transmission and distribution networks of most utilities worldwide have a substantial quantity of porcelain and toughened glass insulators that have been in service for over 30 years; a number that has been traditionally considered as useful life for planning purposes. Many utilities are implementing programs to repla…
In order to increase the knowledge of the processes involved during the degradation of insulating silicone gels under AC stress, recordings of the activity of partial discharges (PD) are performed. Silicone gels are commonly used for the insulation and packaging of high voltage semiconductors such as IGBT modules. We…
In recent years, much effort has been devoted to the effects associated with the presence of nanostructures in bulk materials. Since the introduction of the concept of "Nanodielectrics", various research activities concurred to confirm that these new materials form a special class of composites showing potential. In t…
Glass formation in the InF 3 -BiF 3 -BaF 2 system is studied. Partial substitutions of BiF 3 for InF 3 in the InF 3 -BaF 2 system reduce the glass-transition and glass-crystallization temperatures and increase the thermal stability range and refractive index. The glass structure is studied using IR and Raman spectrosc…
The reaction of 3,4,5,6-tetrafluorophthalonitrile with 1-adamantanol, 1-adamantylamine, 1-adamantanemethanol, and 1-adamantaneethanol gave 4,5-di-(1-adamantyloxy)-3,6-difluorophthalonitrile, 4,5-di-(1-adamantylamino)-3,6-difluorophthalonitrile, 4-(1-adamantylamino)-3,5,6-trifluorophthalonitrile, 3,4,5,6-tetra-(1-adama…
Square grids of gold dots were prepared from several nanometer gold films by locally confined excimer laser ablation. Diffraction-mask projection laser ablation at a wavelength of 248 nm was used to convert Au films of 3, 6 and 9 nm thickness on sapphire substrates into well-ordered arrangements of substrate-adhered g…
Next to conducting polymers and carbon nanotubes (curved, closed graphenes), the material that can bring revolution in electronics is planer graphene (PG)/planer few layer graphenes (PFLG). Synthesis of PG and PFLG by simple, economical and re-producible method was a challenge. We synthesized PFLG films from camphor p…
Low density polyethylene (LDPE) is widely used as a dielectric insulation of power cable. It has already reported that an incorporation of MgO nanoparticles in LDPE matrix could provide dielectrics with new and improved properties under dc high field. This paper describes high field dielectric properties of LDPE/MgO n…
Abstract Thermal residual stresses (TRSs) in continuous Al 2 O 3 fiber reinforced NiAl composites with and without a BN interlayer were studied by using the finite element method (FEM). The FEM model includes the effect of neighboring fibers of the composite. A minimum sample thickness and a minimum size of the surrou…
We have revealed interfacial chemical interaction in Y3Fe5O12/Ba1−x PbxTiO3 magnetoelectric mixture composites during high-temperature firing. The interaction leads to the formation of pyrochlore impurity phases (x > 0.2) and yttrium orthoferrite (x = 0, t = 1300°C). Electrical and piezoelectric characterization resul…
A capacitor discharge joining technique used to fabricate an alumina-(Al2O3) tile-titanium-foil-Al2O3-tile joint was investigated to clarify the influence of titanium foil width on bonding strength. A several-kiloampere pulse current was supplied from an 8.28-muF storage capacitor to the titanium foil while simultaneo…
Microcavity organic light-emitting diodes (MC-OLEDs) based on porous silicon distributed Bragg reflectors (PS-DBRs) have been realized, and improved structural, optical, and electrical properties have been observed. In the device, a multilayer OLED functions as the central active element, sandwiched between a top silv…