Materials Literature
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Degree of deacetylation (DDA) and molecular weight (MW) of chitosans are important to their physical and biological properties. In this study, two chitosans, HS (DDA = 73.3%) and AT (DDA = 76.8%), were deacetylated with 45% sodium hydroxide under nitrogen atmosphere at 80 °C or 90 °C for up to 120 min, to obtain two s…
Flavylium compounds are versatile molecules that comprise anthocyanins, the ubiquitous colorants used by Nature to confer colour to most flowers and fruits. They have found a wide range of applications in human technology, from the millenary colour paints described by the Roman architect Vitruvius, to their use as foo…
Supercapacitor: A π conjugated microporous polymer with an aza-fused framework is reported. The porous framework is conductive and allows electrolyte ions to move into the pores because of structural features (see picture). The material becomes highly co-operative in the formation of electrostatic charge-separation la…
The synthesis and magnetic properties of three new N(2)(3-) radical-bridged dilanthanide complexes, {[(Me(3)Si)(2)N](2)(THF)Ln}(2)(μ-η(2):η(2)-N(2))(-) (Ln = Tb, Ho, Er), are reported. All three display signatures of single-molecule-magnet behavior, with the terbium congener exhibiting magnetic hysteresis at 14 K and…
The elastic displacement field of a sharply angular dislocation with its two legs parallel to a planar free surface is given in a practical analytical form. Its expression gives access, in transmission electron microscopy (TEM), to computed images of numerous interacting dislocations all located at a distance h close…
The miscibility and specific intermolecular interactions in the blends of poly(hydroxyether ketone) (PHEK) and poly(4-vinylpyridine) (P4VP) were investigated by means of differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. The PHEK/P4VP blends displayed single, composition-depend…
In this work,microstructure and texture evolution in the sheets of Mg alloy AZ31 was studied by means of bidirectional cyclic in-plane bending at 423 K followed by annealing at 523 K.The deformed and subsequent annealed microstructures were investigated by OM and SEM/EBSD examinations.The results showed that twinning…
The plant calotropis procera locally name as madar. This family contains biologically active compounds isolated by soxhlet extractor, separated by classical and machine chromatographic techniques using mixed solvent system. The root extract of calotropis procera showed strong cytotoxic effect. The root extract has pot…
With the rapid development of electricity, petroleum and transport industry, more and more pipelines are buried in parallel with high-voltage transmission lines or electrified railways, and the resulting AC corrosion phenomenon has attracted more attentions. In this work, the effects of AC current density, electrolyte…
In modern technical applications various multiphase mixtures are used to meet demanding mechanical, chemical and electrical requirements. To understand their structural properties as continuous macroscopic materials, it is important to capture the microstructure of these mixtures. Due to their vast range of applicatio…
The electronic transport properties of monolayer graphene with extreme physical deformation are studied using ab initio calculations. The aim is to explore the influence of physical bending on transport properties and identify the most important geometrical parameter. The transmission spectra are relatively insensitiv…
Exact analytic expressions for the time-averaged electric and magnetic energies within a negative refractive index metamaterial sphere, which is irradiated by a plane wave, are presented. The metamaterial is dispersive and lossy, with both the permittivity and the permeability frequency-dependent and containing dampin…
A simple precipitation process followed with the heat treatment was developed to synthesize ZnO micro-tubes by self-assembly of nanoflakes composed of nanoparticles. The resulting ZnO micro-tubes demonstrated excellent photocatalytic performance in degrading methylene blue (MB) under UV illumination. It was found that…
A new method to detect the glass transition was used to investigate the effects of physical aging on the glass transition of polystyrene by Fourier transform infrared (FTIR) spectroscopy. The results showed that the onset point of the glass transition shifted to higher temperature with aging, but the end point didn't…
2,2'-Bipyrazine (2,2'-bpz) reacts with cis-(NH(3))(2)Pt(II) in water to give a variety of products, several of which were isolated and characterized by X-ray analysis: cis-[Pt(NH(3))(2)(2,2'-bpz-N4)(2)](NO(3))(2)·3H(2)O (1), [{cis-Pt(NH(3))(2)(2,2'-bpz-N4,N4')}(3)]-(PF(6))(5)NO(3)·7H(2)O (2a), [{cis-Pt(NH(3))(2)(2,2'-…
We prove that, for arbitrary three-dimensional transformation-based invisibility cloaking of an object above a ground plane or of isolated objects, there are practical constraints that increase with the object size. In particular, we show that the cloak thickness must scale proportionally to the thickness of the objec…
Abstract The addition of nanoparticles to polymer systems with an existing phase‐separated morphology, such as polymer blends, represents an innovative approach to controlling the microstructure and, hence, the macroscopic properties of the material. During the melt mixing of the constituents, the particles migrate to…
The heat generation and dissipation of an individual optically excited metallic single-walled carbon nanotube is characterized using a thermal sensor thin film of Al(0.94)Ga(0.06)N embedded with Er(3+). The absorption cross section from an individual SWCNT excited at 532 nm is revealed from the steady-state temperatur…
Poly(aryl ether sulfonamide)s were produced utilizing the sulfonamide moiety as a new activating group for nucleophlic aromatic substitution polymerization. The activated monomer, 2,4-difluoro- N,N -dimethylbenzenesulfonamide, was synthesized in high yields through a simple substitution reaction between 2,4-difluorobe…
Nanocomposites of octavinyl polyhedral oligomeric silsesquioxane (OVPOSS) and functionalized SiO 2 were investigated in order to determine the effect of particles on the morphology and mechanical properties of PMMA. The outcome of the study suggested that functionalized SiO 2 and octavinylPOSS molecule had different m…