Materials Literature
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A series of crystalline homometallic and heterometallic cobalt and nickel hydroxides and oxides were prepared using a continuous hydrothermal flow synthesis system. In all syntheses, the relevant metal salt solutions were pumped under high pressure to meet pH or other chemical modifiers (H 2 O 2 or PVP) before the mix…
The ferrocene-derivatives bis(ferrocenyl-ethynyl)-1,10-phenanthroline (Fc(2)phen) and ferrocenoyltrifluoroacetone (Hfta) have been used to synthesize ferrocene-containing rare-earth beta-diketonate complexes. The complexes [Ln(tta)(3)(Fc(2)phen)] and [Ln(fta)(3)(phen)] (where Ln = La, Nd, Eu, Yb) show structural simil…
We report that symmetry breaking by a magnetic field can drastically increase the photoluminescence quantum yield of single-walled carbon nanotubes, by as much as a factor of 6, at low temperatures. To explain this we have developed a theoretical model based on field-dependent exciton band structure and the interplay…
We present the results of the magnetic and specific heat measurements on V4 tetrahedral-cluster compound GaV4S8 between 2 to 300K. We find two transitions related to a structural change at 42K followed by ferromagnetic order at 12K on cooling. Remarkably similar properties were previously reported for the cluster comp…
Analytical science has gone through several turning points, one of the most decisive of which was signaled by the development and massive use of instruments for analytical purposes. One other pivotal turning point was the inception of computer science, which not only enabled the automatic control of analytical systems…
We study the changes in groove shape and depth that occur when holographic gratings are replicated in plastic. Specifically, we measure the groove profiles and spatial frequencies of electroplated metal shims made from sinusoidal holographic gratings, and also the same properties of the replicas made of polymethylmeth…
SrRuO3thin films have been grown in-situ on and LaAIO3textured metal templates by pulsed laser deposition. Deposition was carried out between 3 mTorr to 300 mTorr of oxygen partial pressure with laser repetition rate of 5 Hz. Substrate temperature was between 500 and 800degC . Dependence of out-of plane orientation Sr…
A phase transition is the transformation of a thermodynamic system from one phase to another. The distinguishing characteristic of a phase transition is an abrupt sudden change in one or more physical properties. Typically the phase transition is driven by a change in the temperature of the system. However, change of…
Fréedericksz transitions between stationary planar deformation states, induced by cover surface interactions and by static external electric or magnetic field in a flat-parallel nematic liquid crystal cell, are studied theoretically in one-dimensional approximation. There is demonstrated that for initial stages of tra…
The complex cobalt and nickel oxide Sr2.25Y0.75Co1.25Ni0.75O6.84 has been synthesized by the citrate method. The oxygen content of the oxide has been determined by iodometric titration. The crystal structure of the compound has been refined using X-ray powder diffraction data (a = 3.7951(2) Å, c = 19.700(1) Å, χ2 = 1.…
A major limitation in fabricating a monolithic Bi2Te3-based thermoelectric thin film device is patterning poorly adhesive Bi2Te3and Bi0.5Sb1.5Te3thin films. In this paper, we present a simple wet etching process that can prevent the delamination of thermoelectric thin films. This process is compatible with standard IC…
SrRuO3-delta(SRO) films were deposited on SrTiO3substrates by an RF magnetron sputtering method and post-annealed in various conditions, and the relationship between their oxygen content, crystallinity, and the magnetic properties was studied. Oxygen content of SRO thin films was evaluated by a non-Rutherford elastic…
Using three kinds of graphites with different graphitization degrees as carbon source and Fe–Ni alloy powder as catalyst, the synthesis of diamond crystals is performed in a cubic anvil high-pressure and high-temperature apparatus (SPD-6 × 1200). Diamond crystals with perfect hexoctahedron shape are successfully synth…
The effect of the isocyanate index, which is the molar ratio NCO:OH, on the development of structural mechanical and fatigue characteristics of microcellular polyurethanes has been studied. The correlation between fatigue and mechanical characteristics of microcellular polyurethanes at an elevated temperature (100°C)…
We report tribological properties of diamond-like carbon (DLC) film of which surface has been nanostructured with femtosecond (fs) laser pulses. For this study, the fs-laser processing technology has been developed to produce a uniformly nanostructured DLC surface over a wide area of 15 x 15 mm 2 . The results have de…
Ultrafine substituted M-type barium ferrite BaTiCoFe10O19 powders were synthesised successfully by the sol-gel method. The hydroxide precursor particles were formed in a gel solution containing ethanol and water at a ratio of 1 : 1 and using NaOH as a co-precipitation agent. The effects of preheat treatments on format…
This paper deals with the static and dynamic characterisation of novel piezo resistive diamond like carbon layers which can be fabricated with high hardness and wear resistance. The advantage of these films, deposited in a plasma enhanced chemical vapor deposition process (PECVD), is the possibility to integrate them…
The realization of a body-area network demands innovative solutions to efficiently power the wireless sensor nodes that typically consume about 100µW of power. Thermoelectric generators (TEGs) harvesting energy from wasted human body heat provide an attractive solution, potentially producing about 30µW per square cent…
We have investigated the history-dependent adsorption behavior of the diblock copolymer P2VP−PEO. The solution self-assembly of this polymer is pH-tunable such that micelles with a P2VP core and a PEO corona are formed above the polymer's p K a of 5.9. In-situ attenuated total reflection and atomic force microscopy we…
Two MHPOBC analogues, exhibiting ferroelectric and antiferroelectric phases, have been studied by means of frequency domain dielectric spectroscopy, time domain spectroscopy and electrooptic methods. Four relaxation processes at low frequencies and one broad spectrum at high frequencies have been revealed in the antif…