Materials Literature
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A gold nanoparticle functionalized with substrates for alpha-chymotrypsin was fabricated to afford an enzyme modulator that exhibited enzyme-specific activation coupled with general inhibition of other proteases.
Divalent metal complexes of macrocyclic ligand 1,4,8,11-tetraazacyclotetradecane-1,8-bis(methylphosphonic acid)) (1,8-H4te2p, H4L) were investigated in solution and in the solid state. The majority of transition-metal ions form thermodynamically very stable complexes as a consequence of high affinity for the nitrogen…
A new strain of Agrobacterium tumefaciens (BST05) was found to grow on polyacrylonitrile (PAN; 13C labelled) converting the polymer to polyacrylic acid as shown by solid state NMR. When cultivated in a medium containing acetonitrile the bacterium produced nitrile hydratase and amidase activity. Activity recovery after…
The optical monitoring method is described to compensate for the thickness error of nonquarterwave layers of dielectric multilayer filters, using optical admittance during deposition. Stability is confirmed by computer simulation of random thickness error generation in layers. In addition, a band split filter consisti…
Two new ferromagnetic organic-inorganic hybrid materials [Co(II)3(H2O)6(pyz)3[W(V)(CN)8]2].3.5H2O (1) and [Co(II)3(H2O)4(4,4'-bpy)3[W(V)(CN)8]2].1.5(4,4'-bpy).6H2O (2) have been synthesised and characterised. The structure of the compounds have been investigated combining EXAFS (extended X-ray absorption fine structur…
Oxalate-based magnets have been known with several different crystallographic structures, from 1D to 3D, but with all of them based in metal ions with octahedral coordination. In this article we report a new bidimensional oxalate-bridged bimetallic magnet where the divalent metal appears heptacoordinated, which has st…
Mesoporous polymer–silica nanocomposite materials with redox functional groups such as ferrocene were synthesized via controlled radical co-polymerization inside mesoporous silicas and exhibited very high activity and selectivity towards catalytic hydroxylation of phenol.
Bismuth ruthenate pyrochlore was tested as a cathode in several bismuth oxide-based electrolyte cells. Erbium oxide stabilized bismuth oxide (ESB) , (BIMEVOX10, , Cu, Zn), and (BRO) were synthesized via solid-state reaction. ESB and BIMEVOX powders were pressed and sintered into dense pellets while BRO was deposited a…
ESR, IR, Raman and optical absorption spectra of 60 B 2 O 3 + 10 TcO 2 +5TiO 2 +24 R 2 O (where R = Li, Na and K) quaternary glasses containing Cu 2+ spin probe have been studied. IR results show the BO 3 -BO 4 - ring structure interconnected by TeO 3 - and TeO 4 - groups, where the BO 4 - groups are neighbours of the…
The martensitic transformation and microstructure of Ni–Mn–Ga films deposited on an alumina substrate and annealed at 1073 K for 36 ks are studied. Electrical resistivity and calorimetry measurements reveal a non-monotonous thickness dependence of the martensitic start temperature, Tms, at submicron film thickness. Fo…
The thermal decomposition behavior of the Fe(II), Co(II), Ni(II) and Zn(II) complexes of polydithiooxamide has been investigated by thermogravimetric analysis (TGA) at a heating rate of 20°C min-1 under nitrogen. The Coats-Redfern integral method is used to evaluate the kinetic parameters for the successive steps in t…
Nanocomposite gel coat system is prepared using unsaturated polyester resin with aerosil powder, CaCO 3 , and organoclay. The influence of organoclay addition on mechanical and water barrier properties of gel coat system is studied for different amount (1, 2, and 3 wt % ) of organoclay. The nanolevel incorporation of…
Spin-1 NMR has been used to characterize the magnetically aligned nematic and hexagonal liquid crystalline phases of aqueous cetyltrimethylammonium bromide (CTAB). A nematic/hexagonal biphasic region has been identified for the first time in this system. The nematic phase is characterized by an order parameter of smal…
Deposition experiments from aqueous solutions of zinc nitrate were performed in a bio-inspired way using biomolecules as directing agents. A global overview of the effect of various amino acids (8) and dipeptides (21) was done in term of structure and morphology of the obtained coating. The selection of certain biomol…
The effects of Sn content and aging conditions on superelasticity in Ti–Mo–Sn alloys were investigated. Martensitic transformation temperature decreased with an increasing of Sn content. A large superelastic strain of 3.0% was obtained in a solution-treated Ti–5 mol%Mo–5 mol%Sn alloy in the tensile test. The superelas…
Ceramic injection molding (CIM) is the most suitable shaping method for mass production of small ceramic components with complex shape in near net shape quality. Due to its high strength and fracture toughness zirconia toughened alumina (ZTA) is an interesting material for ceramic machine components and for biomedical…
High cycle fatigue tests in rotating bending loading were carried out in extruded AZ31 magnesium alloys with two kinds of grain size (about 30 μm and about 50 μm). Effects of microstructure and grain size on fatigue behaviors such as fatigue strength, crack initiation and propagation behaviors were discussed. As the r…
Zirconia doped with low-valent cations (e.g. Y3+ or Ca2+) exhibits an exceptionally high ionic conductivity, making them ideal candidates for various electrochemical applications including solid oxide fuel cells (SOFC) and oxygen sensors. It is nevertheless important to study the undoped, monoclinic ZrO2 as a model sy…
Bacterial cellulose (BC), produced by Acetobacter xylinum, and cotton linters as reference were surface modified by ozone-induced graft polymerization of acrylic acid and used as a template for crystallization of calcium phosphate. The grafting was verified using attenuated total reflection-infrared radiation (ATR-IR)…
A bis-porphyrinic rectangle is created via a double self-assembly algorithm using two orthogonal coordination themes, i.e. first a 90 degrees building block composed of a dynamic heteroleptic Cu(I) or Ag(I) bisphenanthroline followed by a coordinative dimerization using the pyridine-zinc porphyrin motif; the spectrosc…