Materials Literature
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Thin film networks of multiwalled carbon nanotubes (MWCNTs) were prepared by exerting chemically induced capillary forces upon the nanotubes. During this process MWCNTs undergo a transformation from being a vertically aligned structure to an interlocking resistive network of interconnected nanotubes, whose main featur…
Abstract An overview of the recent literature on combustion and flame‐retardancy of epoxy resins is presented. A brief overview of the structures of cured epoxy resins is also presented as a background for better understanding of the thermal decomposition and combustion phenomena. The literature sources were mostly ta…
We apply ultrafast spectroscopy to establish a time-domain hierarchy between structural and electronic effects in a strongly correlated electron system. We discuss the case of the model system ${\mathrm{VO}}_{2}$, a prototypical nonmagnetic compound that exhibits cell doubling, charge localization, and a metal-insulat…
Black single crystals of Ni(dmit)(2) complex (dmit: 2-thioxo-1,3-dithiole-4,5-dithiolate) with trans-4-[2-(1-ferrocenyl)vinyl]-1-methylpyridinium chromophore as a countercation, (FcCHCHPymCH(3))[Ni(dmit)(2)](3), were prepared by the electrocrystallization technique. In the triclinic structure of the complex (P, a = 11…
This paper presents the results of the hypervelocity projectile bombardment of a gold-coated beryllium substrate telescope mirror. Individual latex (ρ = 1.1 g/cm<sup>3</sup>) and iron (7.9 g/cm<sup>3</sup>) projectiles, in the size range 0.70 to 1.44μm (avg. mass = 0.24 - 7.1 x 10<sup>-15</sup> kg), represen…
Form I (HT) and form III (LT) of pleconaril are enantiotropically related with a calculated temperature of transition T τ = 35.7 °C (supposing an ideal behavior). Structural data obtained from single crystal X-ray diffraction at 100 K and room temperature show that (i) form I (HT) can be described as a network of dime…
CDP-6-deoxy-L-threo-D-glycero-4-hexulose-3-dehydrase (E(1)) catalyzes the C-3 deoxygenation in the biosynthesis of 3,6-dideoxyhexoses in Yersinia pseudotuberculosis. E(1) is a pyridoxamine 5'-phosphate (PMP)-dependent enzyme that also contains a [2Fe-2S] center. This iron-sulfur cluster is catalytically essential, sin…
Abstract Clay‐dispersed poly(styrene‐ co ‐acrylonitrile) nanocomposites (PSAN) were synthesized by a free radical polymerization process. The montmorillonite (MMT) was modified by a cationic surfactant hexadecyltrimethylammonium chloride. The structures of PSAN were determined by wide‐angle X‐ray diffraction and FTIR…
Abstract A series of liquid polyester polyols (PEs) from adipic acid (AA), phthalic anhydride (PA) and trihydroxymethylpropane (TMP), and such glycols as ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), butanediol (BD) and hexanediol (HD), were prepared. Polyurethanes (PUs) were obtained from t…
In an effort to provide evidence concerning the conformation of many chains in strict two-dimensional (2D) dense state, we synthesized polymer chains of diameter of nanometers through an anionic polymerization process. The conformational characteristics of the long chain molecules in films of thickness h corresponding…
Abstract Formation of higher‐order structure in crystallization from microphase‐separated melts was studied for polystyrene–polyethylene (PS–PE) diblock copolymers and PS–PE–PS triblock copolymers with time‐resolved synchrotron small‐angle X‐ray scattering (SR–SAXS) techniques. The PE block was crystallized at tempera…
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…