Materials Literature
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Abstract Summary: Aromatic copolyesters containing bio‐based furanic units in the main chain were obtained by ester‐interchange reaction between poly(ethylene terephthalate) (PET) and poly[ethylene 5,5′‐isopropylidene‐bis(2‐furoate)] (PEF) at high temperatures in the bulk. Various copolyesters were synthesized by usin…
The spin dynamics of plate-shaped nanoparticles of NiO has been studied by inelastic neutron scattering and Mössbauer spectroscopy. A value of the in-plane anisotropy energy constant significantly larger than the bulk value has been measured. The temperature and field dependence of the energy of the antiferromagnetic…
Polyacrylamide (PAM)–silver nanocomposite materials have been synthesized by the reduction of the silver salt in the polyacrylamide matrix. Silver nanoparticles embedded in the polymer matrix, observed through transmission electron microscopy (TEM), suggests attractive polymer–particle interaction. Detailed spectrosco…
Among the various biomaterials available for tissue engineering and therapeutic applications, microbial polyhydroxyalkanoates offer the most diverse range of thermal and mechanical properties. In this study, the biocompatibility of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB); containing 50 mol % of 4-h…
The structural transitions of the pyrochlore, ${\mathrm{Cd}}_{2}{\mathrm{Nb}}_{2}{\mathrm{O}}_{7}$, at pressures up to $32.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ have been investigated by in situ Raman scattering and angle-dispersive x-ray diffraction (ADXRD) methods. The x-ray diffraction results reveal that small…
Gallium oxide nanoparticles embedded in silica matrix with different molar ratios were synthesized by the sol–gel method. Powdered nanocomposite samples were annealed at 400, 500 and 900 °C. The gallium oxide nanoparticles (2–5 nm) crystallized in the β-phase at a very low temperature (∼400 °C) as against the expected…
Energy dispersive EXAFS (EDE) and diffuse reflectance infrared spectroscopy (DRIFTS) are combined synchronously at high time resolution (17 Hz) to probe how NO(g) reacts with gamma-Al(2)O(3) supported, metallic Rh nanoparticles of an average 11 A diameter; a bent nitrosyl species is considered to be the key to the for…
Structural properties of carbon peapods, ${\mathrm{C}}_{60}$, trapped into single-walled carbon nanotubes (SWNT), have been studied under high-pressure/high-temperature conditions (HPHT) by in situ x-ray diffraction. The ${\mathrm{C}}_{60}$ chain structure together with the influence of the filling on the SWNT change…
Structural relaxation in amorphous 1,2-dichloroethane (DCE) samples prepared by vapor deposition on cold substrates were studied by Raman scattering. The gauche and trans molecules of DCE were found to coexist in amorphous states immediately after the deposition, and structural relaxation occurred with temperature ele…
Undoped and donor doped SrSnO3 is used as a humidity sensor. The sensitivity increases with increasing donor substitution. Similarly acceptor doped SrSnO3 has high value of electrical conductivity. In the present investigation, compositions with X ≤ 0·10 were synthesised in the systems Sr1−xLaxSnO3 and SrSn1−xNixO3 by…
A facile and efficient synthesis of various novel fluorinated extended porphyrins has been developed. The method is based on the direct intramolecular cyclization and reductive defluorinative aromatization of readily available beta-perfluoroalkylated porphyrins by highly selective C-F bond activation under modified su…
The master equation of a lattice gas reaction tracks the probability of visiting all spatial configurations. The large number of unique spatial configurations on a lattice renders master equation simulations infeasible for even small lattices. In this work, a reduced master equation is derived for the probability dist…
MnO2 nanofiber was found to possess high adsorption capacities for heavy metal ions such as, arsenic and lead, in water due to its high specific surface area (SSA) and high surface activity. However, a significant amount of manganese was found to leach from MnO2 nanofibers. Reducing MnO2 dissolution is very important…
A novel approach to deposit transparent thin films is reported. This approach uses a continuous-flow microreactor to generate a flux of nanoparticles which then impinge on a heated substrate. The as-deposited film consists of highly transparent nanocrystalline with a dilated optical bandgap of . Functional metal-insul…
In the present work, the influence of MgO addition and sintering parameters on the formation and densification of mullite was investigated. The morphology of powders and the microstructure of the sintered samples were characterised by means of a scanning electron microscope. X-ray diffraction was used to characterise…
Structural properties of liquid and amorphous Al2O3.2SiO2 (denoted as AS2) have been studied in a model containing 3025 particles under periodic boundary conditions with the Born-Mayer type pair potentials. Models have been obtained by cooling from the melt via molecular dynamics (MD) simulation. Structural properties…
Summary: Macromonomers from SSE were synthesized via ATRP with initiators carrying functional groups that are polymerizable by Suzuki polycondensation. The material obtained had a monomodal molar mass distribution with a polydispersity of 1.3–1.6. The reaction kinetics in bulk and in solution were monitored by in situ…
Iron-doped boehmite nanofibers with varying iron contents have been prepared at low temperatures using hydrothermal treatment in the presence of poly(ethylene oxide) surfactant. The resulting nanofibers were characterized by transmission electron microscopy (TEM), X-ray diffraction, energy-dispersive X-ray analysis, a…
A theoretical model is suggested that describes the generation of deformation twins at grain boundaries in nanocrystalline metals. Within the model, a thick twin lamella in a nanoscale grain is generated due to stress-driven emission of twinning dislocations from a grain boundary. The lamella consists of overlapping s…
A polyetherurethane (PU) was modified using fluorinated surface-modifying macromolecules (SMMs). A double radiolabel method was used simultaneously to measure the number of adhered platelets ((51)Cr) and the quantity of adsorbed Fg ((125)I), in a cone-and-plate instrument. The objectives were to determine if adsorbed…