Materials Literature
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Layered Li(M,Li)O2 (where M is a transition metal) ordered rock-salt-type structures are used in advanced metal-ion batteries as one of the best hosts for the reversible intercalation of Li ions. Besides the conventional redox reaction involving oxidation/reduction of the M cation upon Li extraction/insertion, creatin…
An analysis of recently reported electron diffraction patterns suggests that metastable austenitic Fe–32Ni alloy subjected to α → γ transformation upon slow heating does not exhibit any signs of formation of the 9 R phase; the conventional nanocrystalline γ phase with an fcc lattice is formed instead. Extended lamella…
The high cycle fatigue tests for smooth specimens of TC25 titanium alloy under different stress ratios are carried out on a MTS 809 Material Test Machine at a given maximum stress level of 917MPa at ambient temperature, the high cycle fatigue lifetimes for such alloy are measured, and the effects of stress amplitude a…
In this research the heating process and melting of water surrounded homogenous gold nanospheres irradiated by nanosecond laser pulses at the wavelengths of 355, 532, 633, and 900 nm are studied. The estimation of absorbed energy by gold nanoparticles with radius range 1-40 nm and their maximum temperature is calculat…
Existence of harmonics in power system makes it unavoidable to custom power filters. Shunt active power filters (SAPF) are broadly implemented in power systems for mitigating the harmonic current component as well as to recompense imaginary or reactive power owing to their exact and reckless operation. The objective o…
The application of electric currents during solidification can cause grain refinement in metallic alloys. However, the knowledge about the mechanisms underlying the decrease in grain size remains fragmentary. This study considers the solidification of Al-Si alloys under the influence of electric currents for the confi…
A sharp rejection, wide and deep stopband microstrip low pass filter is investigated in this paper. The proposed low pass filter is composed of three defected ground structure patterns and four open stubs. Simulated results verify that the filter has a sharpness factor of 0.9, a low insertion loss of 0.65 and a return…
Poly(2-hydroxyethyl methacrylate)-co-poly(4-vinyl pyridine) and poly(HEMA)-co-poly-(4-VP) copolymers were synthesized by free radical polymerization. K2S2O8 was used as an initiator. Chain lengths of the copolymer was changed by varying the monomer/initiator ratio. These polymers have molarites of 2.6 and 2.1 respecti…
We confirmed that photo-induced current in off region changes when we irradiate infrared light to N-type, P-type and PIN-type low-temperature poly-Si TFTs. In addition, we found that the photo-induced current is proportional to the gate width, whereas it does not depend on the gate length. We can indicate that it is p…
The intermetallic Ti-43Al-2Cr-2Nb (at.%) alloy was directionally solidified in an electromagnetic cold crucible with different withdrawal rates ( V ) ranging from 0.2 to 1.0 mm∙min -1 , at a constant temperature gradients ( G =18 K∙mm -1 ). Macrostructures of the alloy were observed by optical microscopy. Microstructu…
Carboxylation of o-cresol, m-cresol, and p-cresol with sodium ethyl carbonate (SEC) proceeds regioselectively with the formation of cresotic acids: 2-hydroxy-3-methylbenzoic acid, 2-hydroxy-4-methylbenzoic acid, and 2-hydroxy-5-methylbenzoic acid, respectively. Optimal conditions for conducting the process have been f…
This paper investigated mechanical properties and microstructure of metakaolin/slag based geopolymers reinforced by short polyacrylonitrile (PAN) fibers. The results showed that addition of short PAN fibers had no effect on the phase composition of the geopolymer but could strengthen and toughen the geopolymers remark…
Monazite-(Ce) and xenotime-(Y) from tertiary pegmatites of the central Alps (Italy and Switzerland) were studied by EMPA and SCXRD analytical methods. The REE-phosphate minerals analyzed are from LCT and NYF pegmatite dikes of the Central Alps, which includes three main areas: Vigezzo (LCT and NYF from the Vigezzo val…
Unlike aliphatic polyamides, the friction coefficient of polyaramides depends not only on the relative concentration of hydrogen bonds in a macromolecule unit, but also on the structural factor, which is related to various positions of the hydrogen bonds in a phenylene nucleus, in this case, the para- and metaposition…
Summary A series of sulfonated polymers from poly(ether ether ketone) (PEEK) and poly(ether ether sulfone) (PEES) were obtained using acetyl sulfate as mild sulfonating agent. The thermoplastic polymers PEEK and PEES were synthesized by polycondensation reactions and sulfonated by electrophilic substitutions of the mo…
Zirconium oxide (ZrO2) is one of the widely studied oxide materials because of its excellent electrical, mechanical and optical properties. In this study, undoped and Dy-Eu-Ce co-doped ZrO2 nanofibers were fabricated by electrospinning method and their crystal structure, surface morphology, optical properties, electri…
A practical dc voltage standard with output voltages Ł/hts from 0.1 V to 10 V using high temperature superconductor (HTS) arrays of Josephson junctions cooled to 77 K was characterized. HTS arrays with increased current margins and the voltage divider with a high stability of the divider's coefficients enable stable a…
The damage introduced by low-velocity impact is a threat to adhesively bonded composite joints. The impact response and tensile behaviors after impact of composite scarf joints was investigated using experimental and finite element analysis techniques. 18 specimens were impacted in three different locations and tensil…
Dielectric elastomer transducers (DETs) consist of an elastic dielectric film sandwiched between compliant electrodes. The dielectric breakdown field strength of the elastomer restricts the applied voltage. For an efficient operation of the DET, the breakdown strength of the elastomer has to be known. In this work, th…
By employing molecular theory, we systematically investigate the shift of solubility of poly(N-isopropylacrylamide) (PNIPAM) brushes in sodium halide solutions. After considering PNIPAM–water hydrogen bonds, water–anion hydrogen bonds, and PNIPAM–anion bonds and their explicit coupling to the PNIPAM conformations, we…