Materials Literature
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Effect of the uniaxial pressure (0–1000 bars) on the dielectric properties of the BaTiO3 single crystals was studied. It was shown that the external stress significantly influences these properties. This includes shift of the phase transformation, diffuseness of the permittivity characteristics and reduction of the th…
Dihydrodipicolinate synthase (DHDPS) is a tetrameric enzyme that is the first enzyme unique to the ( S)-lysine biosynthetic pathway in plants and bacteria. Previous studies have looked at the important role of Tyr107, an amino acid residue located at the tight-dimer interface between two monomers, in participating in…
A series of fluorinated diblock and triblock copolymers of poly(epsilon-caprolactone) and poly(heptadecafluorodecylacrylate) were prepared by combining ring-opening polymerization of epsilon-CL and atom transfer radical polymerization of the acrylate. These copolymers with well-controlled molecular weight and composit…
The syntheses and single crystal X-ray structural analysis of five novel hetero- and homometallic mu 3-oxo trinuclear cluster with the formula [Fe (III) 2M (II)(mu 3-O)(mu-O 2CCH 3) 6(4-Rpy) 3]. x(4-Rpy). y(CH 3CN) where R = Ph for 1(Fe 2Mn), 2(Fe 2Fe), 3(Fe 2Co), 4(Fe 2Ni) and R = CF 3 for 5(Fe 2Co), are reported. Th…
A phenomenological model of plastic deformation is proposed, which captures the size-dependence of plastic flow strength and work-hardening in pure FCC crystalline materials. Guided by discrete dislocation dynamics analyses, the treatment is based on two structural variables determining the mechanical state of the mat…
The work presented here describes the first steps toward designing a planar surface-enhanced Raman scattering (SERS)-active electrode surface, instead of randomly roughened electrode surfaces conventionally used, with the potential to conduct in situ monitoring of electrochemical and electrocatalytic reactions. A plan…
Abstract Composite films with low dielectric constants ( k ) containing micro‐ and mesopores are synthesized from precursor solutions for the preparation of mesoporous silica and ethanolic suspensions of silicalite‐1 nanoparticles. The material contains silicalite‐1 nanoparticles (include nanocrystals and nanoslabs/in…
A ferroic performance: In crystals with both electric and magnetic order, a coupling between the orderings may exist: An applied electric field induces a change of magnetization and an applied magnetic field induces a change of polarization. This magnetoelectric effect makes so-called multiferroics potential future in…
Impedance spectroscopic measurements were carried out on lead based ferroelectric ceramics, namely PZT, PLZT and PMN-PT, in the frequency range of 0.1 Hz–1 MHz. Spectroscopic plots showed broad peaks, and are found to shift towards higher frequency side. Apart from this, both Z″ and M″ spectroscopic peaks are found to…
We demonstrate a method to intimately bond a free-standing nanoporous anodic aluminum oxide (AAO) template onto a piece of gold-coated high reflective index glass (LaSFN9) substrate by an atomic layer deposition (ALD) technique. The capability of ALD as “nanoglue” is well demonstrated by the optical waveguide behavior…
Conducting polyaniline/Stanic oxide (PANI/SnO 2 ) composites have been synthesized by insitu deposition technique by placing fine graded SnO 2 in polymerization mixture of aniline. The PANI/SnO 2 composites have been synthesized with various compositions viz., 10, 20, 30, 40 and 50 wt % of SnO 2 in PANI. The ac conduc…
The hydrothermal Mo−V-based mixed oxide catalysts possessing the M1-phase structure were investigated by XANES and in situ X-ray diffraction under ambient and dynamic redox conditions in the presence of O 2 and H 2 at 693 K. Under ambient conditions, XANES, with the use of model compounds, suggested oxidation states o…
The wettability of glass substrates textured via aluminum-induced crystallization (AIC) of amorphous silicon (a-Si) was studied. It was found that a stable superhydrophilic surface could be produced by AIC of a-Si. This research suggests that densely distributed micron-sized silicon islands with nanoscale silicon spik…
We report experimental observation of electron (e −)/hole (h +) layer on the clean surface of insulating pure BaTiO3 single crystals in ultra high vacuum (UHV < 10−8 Pa). To our knowledge this is the first report of the bipolar surface carrier layer by the field effect on any oxide. The experiments here verify that bo…
A liquid quinary alloy with composition Ni–5%Cu–5%Fe–5%Sn–5%Ge has been prepared from a containerless state by undercooling. Dendritic growth of α-Ni phase took place with a velocity of 28 m s−1 at the maximum degree of undercooling, which was as high as 405 K (0.24T L). All of the four solute elements Cu, Fe, Sn and…
We performed a study of the temperature dependence of the dielectric response of (Ba,Sr)TiO 3 (BST) ceramics for the whole composition range in a wide frequency range by means of Fourier transform infrared, time-domain THz, microwave and low-frequency dielectric spectroscopy. Room-temperature spectra of the paraelectr…
We first time prepared Nd(3+) ions doped anodic aluminum oxide (Nd:AAO) templates, reported linear, sublinear and superlinear photoluminescence (PL) from Nd:AAO templates loaded with Ag nanowires in different excitation power regions, in which, the excitation laser with wavelength 805 nm resonantly pumped the populati…
A novel nanocage structure derived from carboxymethyl-β-cyclodextrins (CMCDs) intercalated in layered double hydroxides (LDHs), whose gates can be controlled by the process of swelling/drying the CMCD−LDH, has been prepared. Furthermore, the extent of opening of this nanocage structure can be controlled by swelling in…
Three isostructural Cu 2Ln 2 1-D polymers [Cu 2Ln 2L 10(H 2O) 4.3H 2O] n where Ln = Gd ( 1), Er ( 2), and Y ( 3) and HL= trans-2-butenoic acid, were synthesized and characterized by X-ray crystallography, electron paramagnetic resonance, and magnetic measurements. Pairs of alternate Cu 2 and Ln 2 dinuclear units are c…
We have studied the structural and magnetic properties of Ni(2)MnGa(1-x)B(x) Heusler alloys with 0≤x≤0.25 using x-ray diffraction, thermal expansion, electrical resistivity, and magnetization measurements. The magnetization measurements were made within the temperature interval of 5-400 K and at applied magnetic field…