Materials Literature
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No theory of the polar and azimuthal anchoring energies of liquid crystals (LCs) has been developed on a molecular level, despite the scientific and practical topicality of the problem. The interaction energies of mesogenic molecules with graphite and polyethylene surfaces calculated previously by the method of atom-a…
Gold nanoparticles (GNP) were synthesized, characterized and their antifungal activities investigated against three pathogenic fungi of different genera and species (Fusarium verticillioides,Penicillium citrinumandAspergillus flavus). The anti-fungi treatments efficiency of the GNP (concentrations: 0, 0.05, 0.1 and 0.…
X-ray photoelectron spectroscopy was employed to characterize the surface chemistry and electronic properties of the Zn1-xCdxO semiconductor systems obtained at the dierent growth conditions. The eect of the growth conditions on the core and valence band spectra as well as room-temperature photoluminescence of the Zn1…
The atmospheric corrosion of zinc samples exposed at 25 test sites with different climatic and pollution conditions was investigated during a two-year exposure program carried out in three of the Canary Islands (Spain) as to cover the typical range of subtropical environmental conditions. The composition and distribut…
This paper presents the performance of polymeric and non-polymeric insulation material in contaminated condition. The purpose of this study is to determine the accuracy of analysis technique on the performance these types of insulation against its tracking and erosion. Polypropylene and glass are selected as polymeric…
We report on enhanced thermoelectric (TE) properties of two-dimensional (2D)-nanostructured cobalt oxides prepared by the exfoliation/restacking method. Polycrystalline [(NaxCoO2)/(CaO)n] (x = 0.48-0.58 and n = 0.14-0.23) were synthesized by restacking the exfoliated Na0.7CoO2 with CaCl2. The composite oxide of [(NaxC…
Dielectric measurements on a bent-core liquid crystal were carried out in the frequency range from 10 mHz to 100 kHz in planar aligned cells. Four relaxation ranges were detected during heating condition: two in a low frequency range of a few hertz probably due to conductivity and interface relaxation phenomena, anoth…
Physical cleaning methods are applied in the semiconductor industry and have become increasingly challenging due to the continued scaling of semiconductors device elements. Cavitation and acoustic phenomena are known to play a fundamental role in megasonic cleaning. Hence, a better understanding of cavitation phenomen…
Abstract Summary: In this work the effects of the structure evolution of neat PLLA and its multi‐wall carbon nanotube nanocomposites at an aging temperature of 45 °C (Tg‐12 °C) have been investigated. The analysis of enthalpy relaxation rate (βH) of composites by means of differential scanning calorimetry (DSC) reveal…
The electrochemical behavior of extruded AZ31E and AZ91E alloys was investigated in Phosphate Buffer Saline (PBS) Solution of pH 7.4 at 37 °C. The behavior of the two alloys was studied with immersion time by using electrochemical impedance spectroscopy (EIS). Polarization measurements are carried out to study the cor…
The inhibitive action of acid extracts from Piper guineensis (PG) on mild steel corrosion in HCl and H2SO4 solutions was investigated by gravimetric and gasometric techniques at 30 °C and 60 °C. The results show PG to be a good inhibitor in both acid solutions. PG exhibited better inhibition efficiency (IE) in HCl tha…
Magnesium is the lightest structural metal. Magnesium alloys have a hexagonal lattice structure, which affects the fundamental properties of these alloys. Plastic deformation of the hexagonal lattice is more complicated than in cubic latticed metals like aluminum, copper and steel. Magnesium alloy developments have tr…
In this work, polyaniline (PANI) film was synthesized by the two-step electrochemical polymerization method from sulfonic acid solution on the spectrographic pure graphite (SPG) surface. Scanning electron microscope (SEM) characterization shows that the resulting PANI film had porous morphology and loosely textured st…
We employ first principles methods to simulate the steady-state catalytic interaction of oxygen with the LaMnO 3 (001) surface under varying levels of oxidative environment. First, density-functional theory together with transition-state theory is used to obtain the energetics and activation barriers of the relevant e…
Crystal structure of Ti5Al2C3 was determined by means of X-ray powder diffraction (XRPD), transmission electron microscopy (TEM) and ab initio calculations. In contrast to the already known P63/mmc space group that the MAX phases crystallize, it was demonstrated that the $$R\bar 3m$$ space group could better satisfy t…
Organic self-assemblies of meso-tetra (4-carboxyphenyl)porphine (TCPP) prepared in trifluoroacetic acid (TFA) and hydrochloric acid solutions at pH < 1 were studied by X-ray photoelectron spectroscopy (XPS) in order to determine the protonation state of the porphyrin building blocks present in the solid self-assembled…
Natural fibre has become the subject of interest for research and development by various organizations due to its biodegradable and competitive mechanical properties. However most of the researchers are focusing on random orientation and compressed mat with only little researches concerned with woven or textile struct…
A detailed study of the role of oxygen vacancies in determining the effective mass and high temperature (300–1000 K) thermoelectric properties of La-doped epitaxial SrTiO3 thin films is presented. It is observed that at intermediate temperatures, a transition from degenerate to non-degenerate behavior is observed in t…
Anticipatory governance (AG) provides a forward-looking framework through which social, ethical, and legal aspects of such emerging technologies as nanotechnology may be assessed. Advanced versions of AG integrate a suite of qualitative methods, including sustainability constellation mapping, as well as quantitative m…
Yne-diamond —a new carbon allotrope constructed by inserting two carbon atoms into the carbon-carbon bonds of diamond was expected to have super-hardness comparable to diamond because of the three-dimensional network of strong sp - sp 3 and sp - sp bonds. However, from a theoretical point of view, this idea has never…