Combustion Engine Cylinder Liners Made of Al-Si Alloys
Abstract The paper deals with problems related to application of aluminum-silicon alloys for combustion engine cylinder liners.
Materials Literature
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Stereological Analysis of Carbides in Hypoeutectic Chromium Cast Iron
Abstract The results of research on stereological parameters of carbides in modified hypoeutectic chromium cast iron were shown in the paper. The effect of distance the casting heat centre of casting to the carbide phase morphology was examined. The samples for metallographic examination were taken from various locati…
Synthesis and modification of reduced graphene oxide aerogels for biofuel cell applications
Abstract We have carried out the preparation of reduced graphene oxide aerogels using eco-friendly method that is based on the Hummers method of graphite oxidation without the use of NaNO3 that produces toxic gases. To obtain a porous 3D structure of reduced graphene oxide, we performed the hydrothermal reduction at e…
Study of Temperature Behavior of Luminescence Emission of LaVO4 and La1-xEuxVO4 Powders
The La1‑xEuxVO4 powders were synthesized by co-precipitation method. Emission spectra of the LaEuVO4 and La1‑xEuxVO4 powders consist of wide non-structural bands of the matrix emission and narrow spectral lines caused by inner f-f electron transitions in the Eu3+ ions, respectively. The both types of emission were stu…
Thermal Stability and Mechanical Characteristics of Densified Ti3AlC2-Based Material
The mechanical properties and temperature stability in air and hydrogen of the highly dense (ρ=4.27 g/cm3, porosity 1 %) material based on nanolaminated MAX phase Ti3AlC2 (89 % Ti3AlC2, 6 % TiC, 5 % Al2O3) manufactured by hot pressing (at 30 MPa) have been investigated. At room temperature the samplesexhibited microha…
Subthreshold transport in mono- and multilayered MoS2FETs
The subthreshold transport properties in exfoliated MoS 2 FETs are reported. The temperature dependence of subthreshold characteristics in multilayered MoS 2 FETs behaves in the same way as that of conventional semiconductors, while conductance fluctuations and random telegraphic signals in the subthreshold region of…
Synthesis, characterization, and antibacterial activities of some metal complexes of heptadentate schiff base ligand derived from acetylacetone
The preparation and characterization of Fe(III), Ni(II), and Mn(III) complexes of tripodalheptadentate Schiff-base ligand N[CH 2 CH 2 N=C(Me)CH=C(Me)OH] 3 have been studied. Heptadentate Schiff base ligand was derived from acetylacetone and tris(2-aminoethyl)amine. These compounds have been characterized by elemental…
Proton Order–Disorder Phenomena in a Hydrogen‐Bonded Rhodium–η5‐Semiquinone Complex: A Possible Dielectric Response Mechanism
A newly synthesized one-dimensional (1D) hydrogen-bonded (H-bonded) rhodium(II)-η(5)-semiquinone complex, [Cp*Rh(η(5)-p-HSQ-Me4)]PF6 ([1]PF6; Cp* = 1,2,3,4,5-pentamethylcyclopentadienyl; HSQ = semiquinone) exhibits a paraelectric-antiferroelectric second-order phase transition at 237.1 K. Neutron and X-ray crystal str…
Influence of parameters of molecular mobility on formation of structure in ferroelectric vinylidene fluoride copolymers
The low-temperature molecular mobility has been studied by dielectric relaxation spectroscopy on the bulk films of statistic copolymers of vinylidene fluoride (VDF) with tetra- (TFE) and trifluoroethylene obtained by crystallization from a solution in acetone. The results show that activation energy of the kinetic uni…
A Polymeric Bowl for Multi‐Agent Delivery
This paper describes a simple system for multi-agent delivery. The system consists of a biodegradable polymer particle with a hollow interior, together with a hole on its surface that can be completely or partially sealed via thermal annealing. A hydrophobic dye, Nile-red, entrapped within the shell of hollow particle…
Studies of scattering mechanisms in gate tunable InAs/(Al,Ga)Sb two dimensional electron gases
A study of scattering mechanisms in gate tunable two dimensional electron gases confined to InAs/(Al,Ga)Sb heterostructures with varying interface roughness and dislocation density is presented. By integrating an insulated gate structure the evolution of the low temperature electron mobility and single-particle lifeti…
Preparation and Characterization of PET/LDH or Clay Nanocomposites through the Microcompounding Process
Abstract Thermally stable modifier were used to modify clay or lithium aluminum layered double hydroxides (LiAl LDH) nanoparticles for preparation of poly (ethylene terephthalate)/clay or LiAl LDH nanocomposites. The effect of modify agent, studied by microcompouding process. The PET nanocomposites which were made by…
Nanomechanics of electrospun phospholipid fiber
Electrospun asolectin phospholipid fibers were prepared using isooctane as a solvent and had an average diameter of 6.1 ± 2.7 μm. Their mechanical properties were evaluated by nanoindentation using Atomic Force Microscopy, and their elastic modulus was found to be approximately 17.2 ± 1 MPa. At a cycle of piezo expans…
Electrical, Surface Morphology and Magneto-Capacitance Properties of Pb Free Multiferroic (BiFeO3)1-x(BaTiO3)xSolid Solutions
The solid solutions (BiFeO3)1-x(BaTiO3)x (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) have been synthesized adopting a solid state sintering route. Well crystalline phase of (BiFeO3)1-x(BaTiO3)x ceramics at dierent level of x has been optimized at sintering temperature of 950 C for 2 h. Dielectric, polarization and magnetocap…
Effect of the Solvent on the Size of Clay Nanoparticles in Solution as Determined Using an Ultraviolet–Visible (UV-Vis) Spectroscopy Methodology
Ultraviolet-visible (UV-Vis) spectroscopy methodology was developed and utilized for the in situ nanoscale measurement of the size of mineral clay agglomerates in various liquid suspensions. The clays studied were organomodified and unmodified montmorillonite clays (I.44p, Cloisite 93a, and PGN). The methodology was c…
Domain structures as optical gratings controlled by electric field in a bent-core nematic
A regular domain structure consisting of parallel stripes - flexodomains - have been induced by low frequency (subHz) electric voltage in a bent core nematic liquid crystal. The wavelength of the pattern is in the range of 1-10 micrometers and thus can conveniently be observed in a polarizing microscope. It also serve…
Estudo do Comportamento Mecânico, Termomecânico e Morfológico de Misturas de Poliestireno/Composto de Borracha Reciclada (SBR)
Misturas de polímeros constituem alternativa para a obtenção de materiais com propriedades que, em geral, não são encontradas em um único material. O objetivo deste trabalho foi produzir misturas poliméricas a partir de uma matriz de poliestireno (PS) com composto de borracha reciclada (SBR) visando à obtenção de prop…
Photocatalytic degradation of indigo carmine using [Zn-Al] LDH supported on PAN nanofibres
Abstract Zn-Al layered double hydroxides (LDH), before and after calcination, were tested for the removal of indigo carmine (IC) dye from solution. These LDH photocatalysts were characterized by powder x-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetry/differential thermogravime…
Magnesium doped ZnO nanostructures synthesis using citrus aurantifolia extracts: Structural and field electron emission properties
We report here the field electron emission performance of pure ZnO and Mg doped ZnO nanostructures prepared on aluminium substrates using Citrus Aurantifolia by the sol‐gel method. XRD analysis confirmed that the pure ZnO and Mg-doped ZnO nanostructures were polycrystalline with the hexagonal wurtzite crystal structur…
Biomimetic Mussel Adhesive Inspired Anchor to Design ZnO@Poly(3‐Hexylthiophene) Hybrid Core@Corona Nanoparticles
The functionalization of zinc oxide (ZnO) nanoparticles by poly(3-hexylthiophene) (P3HT) brush is completed by the combination of a mussel inspired biomimetic anchoring group and Huisgen cyclo-addition "click chemistry." Herein, the direct coupling of an azide modified catechol derivative with an alkyne end-functional…