Materials Literature
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Abstract The thermal and rheological properties of two types of metallocene‐catalyzed linear low‐density PEs (mLLDPEs) and two LDPEs, as well as their blends, were studied using differential scanning calorimeter (DSC) measurements and rheometry. The DSC results showed that the mLLDPE‐1 based on the hexene comonomer is…
An unusual route to hierarchically porous MnO monoliths is demonstrated. The monoliths are obtained by successive stages of liquid- and vapor-phase leaching. The accompanying Figure shows 10–30 nm sized pores created by the conversion of zinc manganese oxide to manganese oxide. The leaching methodology is general and…
Abstract Summary: A novel cyclic carbonate monomer 5‐methyl‐5‐(succinimide‐ N ‐oxycarbonyl)‐1,3‐dioxan‐2‐one (MSTC) was prepared. The copolymers of MSTC with caprolactone (CL) were further synthesized by ring‐opening copolymerization. The copolymers with amido‐amine pendent groups were obtained by aminolysis of poly(M…
A study of sonochemically synthesized ZnS:Mn nanoparticles is presented. The particles prepared at low rf power (about 20 W) and room temperature coalesce to form morphologically amorphous large species (30-100 nm in diameter). As the power is increased in the range from 20 to 70 W, and the solution temperature is rai…
Oxonitridosilicate glasses, with high contents of nitrogen and electropositive metals, have been prepared by a novel synthesis route using metals as precursors (see Figure). They demonstrate high refractive indices, up to 2.30, and Vickers hardness values, up to 13.3 GPa, which are the highest values reported for any…
A series of crystalline perovskite nanoparticles (Ca1–xSrxTiO3, 0 ≤ x ≤ 1, see Figure) has been prepared using a simple, scaleable, molten-salt synthesis method. The generated nanoparticles change from cubes to quasispheres with decreasing x values. Typical nanoparticles have sizes between 70 and 110 nm, irrespective…
Implant failure is one of the major concerns in the biomaterials field. Several factors have been related to the fail but in general these biomaterials do not exhibit comparable physical, chemical or biological properties to natural tissues and ultimately, these devices can lead to chronic inflammation and foreign-bod…
Nanocolumn pseudo-regular arrays of silicon with controlled aspect ratio and porosity are fabricated by electron-beam evaporation using the glancing angle deposition (GLAD) method with vapour impinging at oblique incidence onto rapidly rotating substrates. The width W at positions y along the height of one individual…
Abstract Summary: The preparation of syndiotactic poly(propylene) (sPP) nanocomposites with multi‐walled carbon nanotubes (MWNTs), carbon nanofibers (CNFs), and carbon black (CB) as fillers was accomplished by the in situ polymerization of propylene with a metallocene/methylalumoxane (MAO) catalyst. Different pre‐trea…
Novel protein-based hydrogels have been prepared by blending gelatin (G) with amorphous Bombyx mori silk fibroin (SF) and subsequently promoting the formation of beta-sheet crystals in SF upon exposure to methanol or methanol/water solutions. Differential scanning calorimetry of the resultant hydrogels confirms the pr…
We study the role of defects in the ``single-chain magnet'' CoPhOMe by inserting a controlled number of diamagnetic impurities. The samples are analyzed with unprecedented accuracy with the particle induced x-ray emission technique, and with ac and dc magnetic measurements. In an external applied field the system show…
Systematical molecular statics and dynamics simulations are performed on the interlayer friction and energy dissipation of biwalled carbon nanotubes of different chirality and size, with and without defects. The interlayer friction force of perfect bitube systems is strongly dependent on commensuration and independent…
Abstract Summary: A controlled fabrication of rod‐like nanostructures of cadmium sulfide (CdS) incorporated into polymer fiber matrices has been developed by an electrospinning method. Here, poly(vinyl pyrrolidone) (PVP) was used as a polymer capping reagent, utilizing the interactions of cadmium ions with the carbony…
The electronic and optical properties of carbon nanoscrolls were investigated using a first-principles method based on density functional theory and the local density approximation (LDA). Two models of different sizes were considered and their properties were compared. The nanoscrolls were found to be metallic and sem…
Fluorescent semiconductor nanoparticles, or quantum dots, have potential uses as an optical material, in which the optoelectronic properties can be tuned precisely by particle size. Advances in chemical synthesis have led to improvements in size and shape control, cost, and safety. A limiting step in large-scale produ…
Large-scale well-aligned ZnO nanotubes with outer diameters of 100-300 nm and lengths of tens of micrometres have been prepared by a template-based chemical vapour deposition method. The photoluminescence spectrum of the ZnO nanotube arrays consists of a strong violet band at 414 nm, a blue band at 462 nm and a weak s…
Valencies get remix: A unique kind of electronic structure (Mn+0.5)(μ-L.−)(Mn+0.5) which was previously discussed only for metal–ligand charge-transfer (MLCT) excited states is established structurally and by quantum chemical analysis for both rac (see picture) and meso isomers of [(μ-abpy){Ru(acac)2}2] (abpy=2,2′-azo…
Abstract Summary: The liquid‐liquid phase separation (LLPS) is often coupled with other ordering processes such as crystallization. In a polyolefin blend system, overwhelming changes in crystallization kinetics due to concentration fluctuation caused by spontaneous spinodal LLPS have been observed. Consequently, we ar…
The size control of vertically aligned ZnO nanorod arrays (NRAs) grown by catalyst-free metalorganic chemical vapour deposition is accomplished by changing the O/Zn precursor ratio. At a higher O/Zn precursor ratio, fat ZnO NRAs with excellent alignment are produced. In contrast, slim ZnO NRAs that are considerably le…
Nanoclay-reinforced agarose nanocomposite films with varying weight concentration ranging from 0 to 80% of nanoclay were prepared, and structurally and mechanically characterized. Structural characterization was carried out by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force…