Materials Literature
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The preferred site of Mg segregation at Σ = 11(113) grain boundaries in Al and the effects of Mg segregation on grain boundary cohesion have been investigated through first-principle pseudopotential total energy calculations. The results show that the Mg atom prefers to occupy the ‘looser’ site at the grain boundary o…
The production of polyhydroxybutyrate (PHB) involves a multigene pathway consisting of thiolase, reductase and synthase genes. In order to simplify this pathway for plant-based expression, a library of thiolase and reductase gene fusions was generated by randomly ligating a short core linker DNA sequence to create in-…
A meso-tetraaryl ruthenium porphyrin complex having four polymerizable vinylbenzoxy groups (2) has been synthesized by reaction of pyrrole with 4-(vinylbenzoxy)benzaldehyde and subsequent metalation with [Ru3(CO)12]. The porphyrin complex was immobilized by copolymerization with ethylene glycol dimethacrylate. The res…
A general approach based on the Parsons-Lee theory for soft repulsive molecular fluids is employed to investigate the nematogenic behavior of prolate thermotropic liquid crystals over a broad temperature range. The theory is solved for the particular case of the Kihara soft repulsive spherocylinder model, which is map…
As eries of Fe-substituted manganites Bi0.5Ca0.5Fex Mn1−x O3 (0 x 0.6) wa ss ynthesized by ceramic technology. The crystal lattice parameters change monotonically with increasing Fe substitution for Mn as found from x-ray powder diffraction and neutro nd iffraction investigations at room temperature. Magnetic properti…
All self-assembled nanostructures, like carbon nanotubes, exhibit structural imperfections that affect their electronic and mechanical properties and constitute a serious problem for the development of novel electronic nanodevices. Very common defects in nanotubes are pentagon-heptagon pairs, in which the replacement…
The magnetic properties of the monoradicals 2-(4-phenyl acetylene)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidozolyl-oxyl (1) and 2-(4-phenyl acetylene)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl-3-oxide (2) and the diradicals 2,2'-(1,2-ethynediyldi-4,1-phenylene)bis[4,4,5,5-tetramethyl-4,5-dihydro-1H-imidozolyl-…
Three kinds of biotinylated peptides with different linkers between biotin and beta-sheet peptide were designed and synthesized. The transmission electron microscopy revealed that the biotinylated peptides self-assembled to form a tubular structure with external diameter of ca. 60 nm and inner diameter of ca. 30 nm in…
Electrochemical impedance spectroscopy and cyclic voltammetry are employed to characterize poly(styrenesulfonate)/poly(allylamine hydrochloride) multilayers assembled onto cysteamine-modified gold surfaces. The influence of the supporting electrolyte and temperature on the impedance response is studied because of both…
The kinetics and topology of spherulite growth during crystallization of isotactic polypropylene (iPP) has been studied by using a three-dimensional cellular automaton model. The automaton cells can assume one out of two discrete states, i.e. melt or spherulite . The transformation kinetics governing the individual ce…
Electronic and magnetoresistive properties of $({\mathrm{La}}_{0.5}{\mathrm{Pr}}_{0.2}){\mathrm{Ba}}_{0.3}{\mathrm{MnO}}_{3}$ ($\mathit{AB}{\mathrm{O}}_{3}$ type) compound, having a large size-disorder at the $A$-site, have been studied in both polycrystalline bulk as well as in epitaxial thin-film forms. Both these f…
Ce(x)Zr(1)(-)(x)O(2) solid solutions deposited over silica surface were investigated by X-ray diffraction (XRD), Raman spectroscopy (RS), and high-resolution transmission electron microscopy (HREM) techniques in order to understand the role of silica support and the temperature stability of these composite oxides. For…
Orbital and magnetic ordering in ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{1.5}\mathrm{Mn}{\mathrm{O}}_{4}$ have been studied with resonant soft x-ray scattering at the Mn ${L}_{2,3}$ edges and for the first time azimuthal angle scans and polarization analysis are presented. The azimuthal angle dependencies are well describe…
Experimental pre-edge fine structures in the x-ray absorption spectra of $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ and $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$ at Ti $K$ edge are successfully reproduced within the framework of first-principles one-electron theory using the full-potential augmented plane wave plus local…
This paper examines the thermal expansion of single-walled carbon nanotubes. The vibrational frequencies of carbon atoms are calculated by applying the molecular structural mechanics approach. The entropy of a nanotube is obtained by the quantization of vibrational frequencies. The coefficients of thermal expansion (C…
Abstract The multiple melting behavior of poly(butylene succinate) (PBSu) was studied with differential scanning calorimetry (DSC). Three different PBSu resins, with molecular weights (MWs) of 1.1 × 10 5 , 1.8 × 10 5 , and 2.5 × 10 5 , were isothermally crystallized at various crystallization temperatures ( T c ) rang…
Examination of cross-sections of nanoindents with the transmission electron microscope has recently become feasible owing to the development of focused ion beam milling of site-specific electron transparent foils. Here, we discuss the development of this technique for the examination of nanoindents and survey the defo…
There is a tremendous need to enhance delivery of therapeutic polypeptides to the brain to treat disorders of the central nervous system (CNS). The brain delivery of many polypeptides is severely restricted by the blood-brain barrier (BBB). The present study demonstrates that point modifications of a BBB-impermeable p…
Abstract Porous polylactide (PLA) microspheres were fabricated by an emulsion‐solvent evaporation method based on solution induced phase separation. Scanning electron microscopy (SEM) observations confirmed the porous structure of the microspheres with good connectivity. The pore size was in the range of decade microm…
The development of first wall, blanket and divertor materials that are capable of withstanding for many years high neutron and heat fluxes, is a critical path to fusion power. Therefore, the timely availability of a sound materials database has become an indispensable element in international fusion road maps. In orde…