Materials Literature
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Microorganisms play an important role in toxic metal remediation through reduction of metal ions. Studies demonstrated that silver ions may be reduced extracellularly using Fusarium oxysporum to generate stable gold or silver nanoparticles in water. These particles can be incorporated in several kinds of materials suc…
The feasibility of controlling the selective precipitation of pancreatic proteins was investigated using designed organic antisolvents in a drowning-out process. First, the solubility of pancreatin was measured in water−organic solutions when the organic species and their composition in the solution were varied. Due t…
A chain-like structure compound [4,4′-bipyH2]2[4,4′-bipyH][PCoW11O39] · H2O, in which lacunary polyoxoanions are joined by a Co–O–W bridge, was prepared through the hydrothermal method and characterized by IR, and X-ray crystallography. The title compound crystallizes in a monoclinic lattice, P21/n space group, with a…
Abstract Amine and alcohol functional dendritic polymers were used as covalent coupling agents for maleic anhydride grafted polyethylene and their efficiency compared with metallic salt and zinc acetate, acting as an ionic coupling agent. The crosslinking reactions in the molten state were carried out at 150°C in an i…
A series of nanocrystalline MgO samples containing 1.2−15.9% carbon were prepared by MgO carbonization at 500 °C in 1,3-butadiene flow diluted with argon in a 1:75 ratio. For the sample with 15.9% C almost all the MgO surface was covered with carbon. An increase of the MgO carbonization rate from 500 to 750 °C resulte…
Abstract Dipole moments μ, static electric polarizabilities α, and hyperpolarizabilities β of formaldehyde, thioformaldehyde, urea, formamide, and thioformamide have been evaluated in the DFT and post‐HF approximations. Within the DFT, the family of HCTH and hybrid functionals (B3LYP, B97–1) have been adopted. The qua…
The ligand 1-methyl-3,5-bis(2,2':6',2' '-terpyridin-4'-yl)benzene has been employed in the synthesis of a new bimetallic ytterbocene complex [(Cp*)2Yb](1-methyl-3,5-bis(2,2':6',2' '-terpyridin-4'-yl)benzene)[Yb(Cp*)2] (1) and the doubly oxidized congener [1]2+ in an attempt to determine the impact of the bridging liga…
The directional-curvature theory is developed as a rational basis for the strain energy and the chemical reactivity in single-walled carbon nanotubes (SWCNTs) and fullerenes. The directional curvature KD and its mean KM, derived from this theory, cover the overall curvatures of their bonds and atoms and break through…
Abstract Spherulitic textures of poly[tetrafluoroethylene‐ co ‐(perfluoropropyl vinyl ether)] (PFA) were examined in detail using polarized optical microscopy. The PFA consisting of random comonomer units among the tetrafluoroethylene units crystallizes as spherulites composed of lamellae, although polytetrafluoroethy…
Abstract The selective ion transport of aqueous salt solutions including mono‐, di‐, trivalent cations across both doped and undoped polyaniline (PAni) membranes was described. PAni‐based asymmetric membranes were prepared by the phase inversion method from the casting solution containing N ‐methyl pyrrolidone. It was…
We investigate size effects in nanocrystalline nickel nanowires using molecular dynamics and an EAM potential. Both compressive and tensile deformation tests were performed for nanowires with radii ranging from 5 to 18 nm and a grain size of 10 nm. The wires contained up to four million atoms and were tested using a s…
Abstract Polycaprolactone (PCL) grafting on vinyl alcohol‐ co ‐vinyl acetate) (PVA‐Ac), was investigated in the melt at high temperature (170°C), below the PVA‐Ac melting point, by ring opening polymerization of ϵ‐caprolactone initiated by metal alkoxyde sites present in PVA‐Ac: no additional initiator was used. The o…
Measurements are reported of breakdown voltage values and pre-breakdown voltage–current characteristics as a function of air density in a simple rod–plane electrode gap 50 mm in length. Pressure has been reduced and temperature raised from normal atmospheric values, independently of each other, to give the relative ai…
Part 1 Measurements and reference electrodes: Current state-of-the-art in reference electrode technology for use in high subcritical and super critical aqueous systems LIRES: A European sponsored research project to develop light water reactor reference electrodes In-plant corrosion potential measurements in light wat…
Novel shape memory behaviour was discovered recently in single-crystalline fcc nanowires of Cu, Ni and Au with lateral dimensions below 5 nm. Under proper thermomechanical conditions, these wires can recover elongations up to 50%. This phenomenon only exists at the nanoscale and is associated with reversible lattice r…
Abstract A series of poly(ester‐urethane‐urea) acrylates were synthesized using poly(ethylene adipate) diol (PEA), 4,4′‐diphenyl methane diisocyanate (MDI), different diamines and acrylic acid. On the basis of IR, stress–strain, thermogravimetric, and differential scanning calorimetry measurements of their cured mater…
This paper reports on ZnO nanowires arrays synthesized using Sn as a catalyst. The Sn particles were produced from the reduction of SnO2 powders via a vapour-solid growth process. Control of growth conditions led to the formation of ZnO nanowire arrays, radial nanowire ‘flowers’ and uniaxial fuzzy nanowires. ZnO nanow…
Wenn aus Feinden Freunde werden: Die hierarchische Selbstorganisation – durch konzertierte Wirkung verschiedener Kräfte auf ihren charakteristischen Längenskalen – ermöglicht die Bildung von funktionellen supramolekularen Architekturen mit hohem Ordnungsgrad sowohl auf der nano- als auch auf der makroskopischen Ebene.…
Abstract Tensile and impact properties of Neem bark flour (BF) containing high density polyethylene (HDPE) composites were studied at 0–0.26 volume fraction of filler. Tensile modulus and strength and breaking elongation decreased with increase in BF concentration. The decrease in tensile modulus and strength was attr…
Abstract Aqueous polyurethane (APU) dispersions having a solid content of 50% were synthesized using dimethyol propionic acid (DMPA) as the stabilizing moiety. The principal diols used were poly‐1,4‐butylene adipate glycol (PBA). The diisocyanates used in this study were a 30:70 blend of hexamethylene diisocyanate (HD…