Materials Literature
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This paper presents study aimed at clarifying the effect of magnetic field on electrical tree propagation in cross-linked polyethylene (XLPE) cable insulation. By adding dicumyl peroxide (DCP) as cross-linking agent into low density polyethylene (LDPE), the test samples are made at cross-linking temperature (CT) range…
The electric properties of hybrid organic-inorganic nanostructured coated XLPE are investigated in this paper with the purpose to understand if this class of nanostructured insulating material could have applications in the field of high voltage electrical insulation. Space charge measurements and aging tests under pa…
Gold nanoparticles (AuNPs) have a unique property called localized surface plasmon resonance (LSPR). LSPR excitation wavelength is strongly dependent on size of gold nanoparticles. At the LSPR wavelength, gold nanoparticles exhibit an enormous electric field enhancement extended from their surface. We have been synthe…
This paper deals with hemp-fibre and glass-fibre woven fabric/epoxy composites. The aim is to analyse damage mechanisms in these composites by comparing three different methods: acoustic emission, microscopic observations and stiffness loss measurement. For acoustic emission (AE), an experimental multi-scale analysis…
In this paper we present a model for local gas assisted focused electron beam induced deposition which allows estimating the surface diffusion coefficient and the residence time of volatile precursor adsorbates. Elaborating the existing continuum model for one adsorbate species and using a novel set of parameters we s…
High quality non porous silicon nitride layers were deposited by hot wire chemical vapour deposition at substrate temperatures lower than 110 degrees C. The layer properties were investigated using FTIR, reflection/transmission measurements and 1:6 buffered HF etching rate. A Si-H peak position of 2180 cm(-1) in the F…
The electrochemical creeping and actuation of polypyrrole films operated in an ionic liquid are reported. The electrochemical deformation was initiated by the reduction and swelling of the films by 15–20% with soaking in ionic liquid. An electrochemical strain of 3% and a blocked stress of 1.7 MPa showing cation movem…
Fundamental kinetic aspects of the decomposition of mixtures and double salts of ammonium nitrate and ammonium sulfate were studied. The effect of water and sulfuric acid additives on the thermal decomposition rate of ammonium nitrate and sulfate mixtures was examined. The constant of proton exchange between nitric ac…
We used piezoresponse force microscopy (PFM) to study the dc bias field-induced domain structure of the (001) oriented single crystals of 0.77PbMg1/3Nb2/3O3-0.23PbSc1/2Nb1/2O3 relaxor. In the as-grown state, no polarization contrast was observed due to the average cubic symmetry of the crystal. Upon application of a d…
The structure of graphene on Ni(110) was studied using scanning tunneling microscopy (STM) and low-energy electron diffraction spectroscopy. STM images show a Moire structure, depending on the orientation of the domains making up the graphene layer. A simple model has been proposed which permits prediction of the Moir…
Based on the recently proposed model of grain-boundary diffusion, the available research data on grain-boundary diffusion of Co in W, and on emission Mössbauer studies of grain boundaries in polycrystalline W have been analyzed in detail. Using joint processing of primary data for tracer analysis and Mössbauer studies…
Capillary kinetics of textile knitted fabrics are investigated considering the effect of transverse swelling in fiber and yarn scales. A mathematical model was developed based on the industrial construction parameters, the capillary mechanism and the swelling ratio on both porosity scales: macro and micro. The capilla…
This paper presents a preliminary exploration in tribological property and dynamic elastic/plastic behavior of cement composite material at micro- and nano- scale. Pastes were prepared by pure cement clinker with water-to-cement ratio of 0.3 and 0.4. For comparison, a polymer-based clinker composite was also introduce…
Abstract In this study, Na‐montmorillonite was organically modified with cetyltrimethylammoniumbromide (CTAB) and intercalated with in‐situ polymerized indene. Polyindene(PIn)/Organo‐MMT nanocomposites were obtained with three different compositions and coded as: K1: [PIn(94.5%)/O‐MMT(5.5%)], K2: [PIn(92.8%)/O‐MMT(7.2…
CuO nanoparticles showing different morphologies were prepared by polymeric precursor method using three different copper sources: basic copper carbonate, copper nitrate and copper hydroxide. The decomposition temperature of the precursors varies from 200 C to 400 C. The effect of the concentration of the polymeric…
Elpidite Na 2 ZrSi 6 O 15 · 3H 2 O [space group Pbcm , a = 7.1312(12), b = 14.6853(12), and c = 14.6349(15) Å] from Khan Bogdo (Mongolia) and its K- and Rb-exchanged forms K 1.78 Na 0.16 H 0.06 ZrSi 6 O 15 · 0.85H 2 O [ Cmce , a = 14.054(3), b = 14.308(3), and c = 14.553(3) Å] and Na 1.58 Rb 0.2 H 0.22 ZrSi 6 O 15 · 2…
The aggregation of a tetraaryl-porphyrin with chiral amide-containing side groups depends critically on the central metal ion in the tetrapyrrolic core, an effect shown dramatically in solution as well as in the gel formation by the compounds. In solution, the circular dichroism (CD) spectra of the metalloporphyrins s…
Many studies have shown that amorphous carbon films with reduced internal stress, improved adhesion strength, and diversified material properties are obtainable through doping process, but the presence of dopants was reported to promote surface evolution and alter the microstructures of carbon matrix. By combining ana…
This article reports the result of the effect of banana fiber on the dynamic mechanical and thermal properties of polyester composites. Composites were prepared using resin transfer molding by varying the fiber content (20, 30, 40, and 50 vol.%). Studies revealed that increase in the fiber content will increase the st…
Bi3.15Nd0.85Ti3O12 (BNT) ferroelectric thin film was fabricated on Pt(111)/Ti/SiO2/Si substrate using pulsed laser deposition. Domain structure, domain switching and hysteresis loops of the BNT film were investigated via piezoresponse force microscopy (PFM). Clear domain structure, complete domain switching and strong…