Materials Literature
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A planar side-gate device for field effect with a La0.67Ba0.33MnO3 channel on a SrTiO3 substrate is fabricated by means of the voltage-biased tip of an atomic force microscope. The peculiar geometry and the high dielectric permittivity of the substrate enhance the channel resistance modulation up to 20% at low tempera…
Surface CH stretching features on diamond nanocrystals of different origins and sizes have been characterized by Fourier transform infrared spectroscopy and density functional calculations. Independent of the origins of the samples, a single sharp transition, corresponding to the CH stretch on C(111)-1×1, is observed…
On the basis of an extended Flory–Huggins expression for the mixing free energy of the long-chain binary polymer blend, we showed that liquid–liquid demixing can be driven solely by the propensities of crystallization differing with respect to components. Demixing prior to crystallization on cooling was demonstrated b…
We report a method for producing stable low-density polymer films by using supercritical carbon dioxide (scCO2). Two different molecular weight polystyrene films with various thicknesses were exposed to scCO2 along the density fluctuation ridge in P–T phase diagram. The swollen structures could be then frozen by flash…
In the control of environmental pollution, metal carbides are potentially useful for trapping and destroying sulfur dioxide (SO2). In the present study, the density functional theory was employed to study the surface structures and electronic properties of the adsorbed SO2 on titanium carbides: metcar Ti8C12, nanocrys…
Fumed silicas unmodified ( S BET = 378 m 2 /g) and modified (379−285 m 2 /g) by hexamethyldisilazane reacting with silanols (concentration of grafted trimethylsilyl groups C TMS = 0.09−0.79 mmol/g) were studied by means of the NMR, IR, differential thermogravimetry, atomic force microscopy, microcalorimetry, adsorptio…
For the preparation of carbon-poor Si/B/C/N precursors, Si/C/N/H polymers with Si:C atomic ratios higher than or equal to 1 were synthesized by Wurtz-type coupling and subsequent ammonolysis of ClSiH(Me)NHSiH(Me)Cl and MeSiHCl 2 or H 2 SiCl 2 . They were reacted with a borane to obtain three different precursors which…
A method for controlled synthesis of coiled carbon nanotubes (CNTs) is demonstrated, in which three-dimensional columns of aligned CNTs are used as a template. The coiled CNTs with pitches and coil diameters from 100 to 300 nm are regrown on the straight CNT arrays and the mesoporous structure between the CNT arrays p…
Infrared reflection absorption spectroscopy of CO has been used as a surface-sensitive probe for the available binding sites of Co–Pd bimetallic particles supported on a thin alumina film. A high-coverage state is obtained on the Co particles in addition to atop sites, attributable to a M(CO)n species. Bridge and thre…
Abstract N , N ′‐(Pyromellitoyl)‐bis‐( L ‐leucine) diacid was reacted with ethyl chloroformate in the presence of triethylamine followed by reaction with activated sodium azide and gave N , N ′‐(pyromellitoyl)‐bis‐( L ‐leucine) diacylazide in high yield. This diacylazide was heated in dry benzene and gave the unstable…
DNA primases are essential components of the DNA replication apparatus in every organism. Reported here are the biochemical characteristics of a thermostable DNA primase from the thermophilic archaeon Pyrococcus horikoshii, which formed the oligomeric unit L(1)S(1) and synthesized long DNA primers 10 times more effect…
Abstract Silicone formulations based on polydimethylsiloxane (PDMS) were investigated by using a number of analytical techniques. Horizontal attenuated total reflectance Fourier‐transform infrared (HATR‐FTIR) spectroscopy studies have confirmed the stability of these materials towards photo‐oxidation. No significant o…
Analytical expressions for transverse electron spin relaxation induced by small angle motion were derived for the first time within an anisotropic model for rotational diffusion by using an approximation of the spin Hamiltonian and its variation during reorientation that is valid close to the canonical orientations. T…
The temperature dependence of the electrical and electromechanical properties of Pb(Zr,Ti)O3 (PZT) (Zr/Ti=30/70, 52/48, and 70/30) thin films are investigated. The 1-μm-thick PZT thin films were prepared on (111)Pt/Ti/SiO2/Si substrates by chemical solution deposition. The temperature dependence of the dielectric and…
The mechanisms for HO2+NO and its reverse reactions have been investigated by ab initio molecular orbital and transition-state theory calculations. The species involved have been optimized at the B3LYP/6-311+G(3df,2p) level and their energies refined by single-point calculations with the highest scheme of the modified…
This paper describes a reliable method to selectively produce metastable α-form glycine crystals with a controlled size in batch cooling crystallization. Seeding had a large effect both on the polymorphism and the size distribution of the product crystals. In the case of sufficient seed loadings of the α -form crystal…
This study investigated the structural and electrical properties of (Ba,Sr)TiO3 (BST) thin film capacitors with thicknesses ranging from 18 to 215 nm, which were prepared by on- and off-axis rf magnetron sputtering technique on Pt/SiO2/Si substrates. The deposition rate and cation composition ratios of the films were…
A new magnetic resonance imaging (MRI) contrast agent designed to mimic sialyl Lewis X (sLeX) and to target inflammation has been synthesized and characterized. The evolution of its proton longitudinal relaxivity as a function of the magnetic field (NMRD) and temperature has been studied. The exchange rate of the wate…
This study investigates high-resolution photoinduced biphotonic holographic gratings in azo-dye-doped liquid crystal films. A biphotonic grating (BG) is formed under the illumination of one linearly polarized green light with the simultaneous irradiation of an interference pattern created by two linearly polarized red…
In this work we present the first derivation and implementation of quadratic response theory as described within the combined coupled cluster/dielectric continuum (CC/DC) and the combined coupled cluster/molecular mechanics (CC/MM) methods. In the former approach, the solvent is represented as a homogeneous dielectric…