Materials Literature
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Shape-controllable yttria nanocrystals were synthesized through a simple hydrothermal pattern. The shape of nanoparticles, nanoflakes, and nanorods can be controlled by the pH value. X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to characterize the pr…
Aspects of poly( l -lysine) (PLL) and poly( l -glutamic acid) (PLGA) multilayer thin film assembly, physical properties of the films, and changes in film structure on pH shift have been studied by far-UV circular dichroism spectroscopy (CD), ultraviolet spectroscopy (UVS), ellipsometry, quartz crystal microbalance (QC…
We present an experimental and theoretical investigation of the adsorption, desorption, and dissociation of NO on the stepped Pt (533) surface. By combining temperature programmed desorption and reflection absorption infrared spectroscopy, information about the adsorption sites at different temperatures is obtained. S…
Abstract The crystalline transition behavior of polyamides X 18, where X = 2, 4, 6, 8, 10 and 12, has been studied by variable‐temperature wide‐angle X‐ray diffraction (WAXD) and real‐time Fourier‐transform infrared (FTIR) spectroscopy. It was found that polyamides 2 18 and 4 18 undergo the Brill transition on heating…
The adsorption of dicyanoaurate(I) complexes on nanoporous carbon is widely used for the recovery of gold in the extractive metallurgy industry. However, there is no agreement on the adsorption mechanism concerning the nature of the adsorbed species on carbon surface. A novel experiment was designed in this study by t…
Abstract Chemical heterogeneity can influence the properties of statistical copolymers. It is shown that any integral property of a copolymer will depend on the chemical heterogeneity if such a property is a non‐linear function of copolymer composition. This is illustrated by means of the conductivity of copolymers of…
We report on the results of low-temperature magnetization, specific-heat, and resistivity measurements on a $\mathrm{Tb}{\mathrm{Fe}}_{2}{\mathrm{Si}}_{2}$ single crystal in magnetic fields up to $5\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ applied parallel to the principal crystallographic axes. We conclude that $\mathrm…
Ni0.7Mn0.3LaxFe2–xO4 (x = 0, 0.04, 0.06, 0.08, 0.1) ferrite powders with nanosize well-developed spinel phases were prepared by the emulsion method. The growth of particles, the structure and the magnetic properties were investigated by X-ray diffraction (XRD), Mössbauer spectroscopy and a vibrating sample magnetomete…
The electrical properties of Cu-substituted Ni–Mn ferrite Ni1–xCuxMnyFe2–yO4 (with 0.0 ≤ x ≤ 1.0 and y = 0.6) are investigated by ac conductivity measurements in the frequency range 102–105 Hz and over the temperature range 300–730 K. The results obtained for these materials reveal a semiconductor-to-metallic transiti…
Abstract The preparation and properties of a series of nanocomposite materials obtained using different organically modified montmorillonite clays with a simple epoxy resin are reported. Dynamic mechanical thermal analysis is used to assess the effect of the incorporation of the clay platelets into the matrix of the p…
The synthesis, optical properties, and solid-state structures of a series of o-(aryleneethynylene) oligomers containing three to seven aryl units is described. The main chain in all examples is composed of between one and five 4,5-dimethoxybenzene rings which are capped on each end by 2-pyridyl rings. These oligomers…
A force field model of phosphorus has been developed based on density functional (DF) computations and experimental results, covering low energy forms of local tetrahedral symmetry and more compact (simple cubic) structures that arise with increasing pressure. Rules tailored to DF data for the addition, deletion, and…
Whereas the $^{23}\mathrm{Na}$ spin-lattice relaxation rate ${T}_{1}^{\ensuremath{-}1}$ of microconfined ${\mathrm{NaNO}}_{2}$ in the ferroelectric phase is similar to the one of bulk ${\mathrm{NaNO}}_{2}$, there is a striking difference in the paraelectric phase. Instead of decreasing, the relaxation rate here increa…
Discrete nickel catalyst nanoparticles (NP) have been used to grow isolated single-walled carbon nanotubes by chemical vapor deposition (CVD). Atomic force microscopy (AFM), transmission electron microscopy (TEM) and micro-Raman spectroscopy are used to characterize these as-grown, isolated nanotubes. Using a conventi…
A method of free energy calculation is proposed, which enables to cover a wide range of pressure and temperature. The free energies of proton-disordered hexagonal ice (ice Ih) and liquid water are calculated for the TIP4P [J. Chem. Phys. 79, 926 (1983)] model and the TIP5P [J. Chem. Phys. 112, 8910 (2000)] model. From…
Periodic DFT calculations have been performed to investigate the adsorption, activation, and reactivity of N 2 O on a Rh(111) surface. Several adsorption modes in a narrow range of energies have been found. The most stable situation corresponds to a weak bonding (0.39 eV) via the N-terminal atom on top of a Rh atom, w…
Abstract Polyamide‐11 (PA11)/clay nanocomposites were prepared by in situ intercalative polymerization. The crystal morphology and crystallization kinetics of these nanocomposites were investigated via polarized light microscopy (PLM), small‐angle laser scattering (SALS) and differential scanning calorimetry (DSC). PA…
A procedure for the Raman spectra calculation of vitreous and molten silicates was presented in this paper. It includes molecular dynamics MD simulation for the generation of equilibrium configurations, Wilson's GF matrix method for the calculations of eigenfrequencies and corresponding vectors, electro-optical parame…
Two paralogous groups of liver fatty acid-binding proteins (FABPs) have been described: the mammalian type liver FABPs and the basic type (Lb-FABPs) characterized in several vertebrates but not in mammals. The two groups have similar sequences and share a highly conserved three-dimensional structure, but their specifi…
The reaction of Fe(III) with Na(+) and K(+) salts of the trivacant [alpha-SiW(9)O(34)](10)(-) ligand have been investigated at pH 6 and pH 1. A new dimer, [(alpha-SiFe(3)W(9)(OH)(3)O(34))(2)(OH)(3)](11-) (1), is synthesized by reacting Na(7)H(3)[alpha-SiW(9)O(34)] or K(10)[alpha-SiW(9)O(34)] with exactly 3 equiv of Fe…